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• Don't Forget To Enjoy Life

  - by Justin

  I have a pretty clear stance on posting personal information in my blogs. I tend to avoid it almost instinctively. Part of that is because I am a somewhat private person. And the other is because I know how easy it is for personal information to be gathered and collected from sources such as blogs. So, this has remained a tech only blog for me. I've only posted topics mostly related to issues I have encountered at work. In a way this blog is a 'bookmark' for me. If I post something here and run into the issue again it allows me to refer back to a convenient place where the 'fix' is documented in a way that I understand. But today, I am posting something that speaks to everyone. Something PERSONAL. Honestly, I expect this entry to receive zero views. But if nothing else, I can come back to this blog one day when I'm having a bad day or something and run across this post. And I will be reminded... DON'T FORGET TO ENJOY LIFE. Say this to yourself out loud, right now. People, we can get caught up in some rather mundane details as we trek through life. It's so easy to lose track of what really matters that it should be no surprise to find yourself reading something like this and thinking to yourself 'Yeah. You are right, man. Some of this crap I'm clinging on to right now is so small in the grand scheme of things'. I have no reservation, no shame, in saying that I am more often than not caught up in the ever evolving world of 'shit that does not matter'. When you work in technology, you are surrounded by deadlines, upgrades, new versions, support 'end of life', etc. And by time you get done with your 8 hours you go home and put in a few more because you are STILL CAUGHT UP in the things you dealt with at work all day. DO YOURSELF A FAVOR. DO YOUR FAMILY AND FRIEND A FAVOR. When you are done for the day, and you drive home, get those work-related things out of your head before you pull into the driveway. If you are still thinking on them when you park the car, leave the engine running, close your eyes and take a deep breath. If you believe in God, pray. If you don't then meditate for a second with the INTENTION of letting go of the day and becoming the 'real you'. You may have forgotten who the real you is so I'll remind you.... THE REAL YOU IS THAT GUY OR GAL THAT LAUGHS, LOVES, AND LIVES. Be the real you as often as possible. If you can't do it during your 9 - 5, do it at home. YOUR RELATIONSHIPS AND YOUR PERSONAL HAPPINESS DEPEND ON IT. I am going to make you a promise right now. If you do what I've just said, your days will be longer and your joy will be exponential. I can't explain why I know this to be true. But I do know it. And if you are there reading this right now, you know it is true too. We both know it is true because it COMES FROM WITHIN EVERY MAN, WOMAN and CHILD. We are born into love and happiness. Lets not fade away into the darkness so easily found in this world. Lets keep the flame burning. The flame of passion. Passion for LIFE. Peace be with you.

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• Learn Many Languages

  - by Jeff Foster

  My previous blog, Deliberate Practice, discussed the need for developers to “sharpen their pencil” continually, by setting aside time to learn how to tackle problems in different ways. However, the Sapir-Whorf hypothesis, a contested and somewhat-controversial concept from language theory, seems to hold reasonably true when applied to programming languages. It states that: “The structure of a language affects the ways in which its speakers conceptualize their world.” If you’re constrained by a single programming language, the one that dominates your day job, then you only have the tools of that language at your disposal to think about and solve a problem. For example, if you’ve only ever worked with Java, you would never think of passing a function to a method. A good developer needs to learn many languages. You may never deploy them in production, you may never ship code with them, but by learning a new language, you’ll have new ideas that will transfer to your current “day-job” language. With the abundant choices in programming languages, how does one choose which to learn? Alan Perlis sums it up best. “A language that doesn‘t affect the way you think about programming is not worth knowing“ With that in mind, here’s a selection of languages that I think are worth learning and that have certainly changed the way I think about tackling programming problems. Clojure Clojure is a Lisp-based language running on the Java Virtual Machine. The unique property of Lisp is homoiconicity, which means that a Lisp program is a Lisp data structure, and vice-versa. Since we can treat Lisp programs as Lisp data structures, we can write our code generation in the same style as our code. This gives Lisp a uniquely powerful macro system, and makes it ideal for implementing domain specific languages. Clojure also makes software transactional memory a first-class citizen, giving us a new approach to concurrency and dealing with the problems of shared state. Haskell Haskell is a strongly typed, functional programming language. Haskell’s type system is far richer than C# or Java, and allows us to push more of our application logic to compile-time safety. If it compiles, it usually works! Haskell is also a lazy language – we can work with infinite data structures. For example, in a board game we can generate the complete game tree, even if there are billions of possibilities, because the values are computed only as they are needed. Erlang Erlang is a functional language with a strong emphasis on reliability. Erlang’s approach to concurrency uses message passing instead of shared variables, with strong support from both the language itself and the virtual machine. Processes are extremely lightweight, and garbage collection doesn’t require all processes to be paused at the same time, making it feasible for a single program to use millions of processes at once, all without the mental overhead of managing shared state. The Benefits of Multilingualism By studying new languages, even if you won’t ever get the chance to use them in production, you will find yourself open to new ideas and ways of coding in your main language. For example, studying Haskell has taught me that you can do so much more with types and has changed my programming style in C#. A type represents some state a program should have, and a type should not be able to represent an invalid state. I often find myself refactoring methods like this… void SomeMethod(bool doThis, bool doThat) { if (!(doThis ^ doThat)) throw new ArgumentException(“At least one arg should be true”); if (doThis) DoThis(); if (doThat) DoThat(); } …into a type-based solution, like this: enum Action { DoThis, DoThat, Both }; void SomeMethod(Action action) { if (action == Action.DoThis || action == Action.Both) DoThis(); if (action == Action.DoThat || action == Action.Both) DoThat(); } At this point, I’ve removed the runtime exception in favor of a compile-time check. This is a trivial example, but is just one of many ideas that I’ve taken from one language and implemented in another.

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• It happens only at Devoxx ...

  - by arungupta

  After attending several Java conferences world wide, this was my very first time at Devoxx. Here are some items I found that happens only at Devoxx ... Pioneers of theater-style seating - This not only provides comfortable seating for each attendee but the screens are very clearly visible to everybody in the room. Intellectual level of attendees is very high - Read more explanation on the Java EE 6 lab blog. In short, a lab, 1/3 of the content delivered at Devoxx 2011, could not be completed at other developer days in more than 1/3 the time. Snack box for lunches - Even though this suits well to the healthy lifestyle of multiple-snacks-during-a-day style but leaves attendees hungry sooner in the day. The longer breaks before the next snack in the evening does not help at all. Fortunately, Azure cupcakes and Android ice creams turned out to be handy. I finally carried my own apple :-) Wrist band instead of lanyard - The good part about this is that once tied to your hand then you are less likely to forget in your room. But OTOH you are a pretty much a branded conference attendee all through out the city. It was cost effective as it costed 20c as opposed to 1 euro for the lanyard. Live streaming from theater #8 (the biggest room) on parleys.com All talks recorded and released on parleys.com over next year. This allows attendees to not to miss any session and watch replay at their own leisure. Stephan promised to start sharing the sessions by mid December this year. No need to pre-register for a session - This is true for most of the conferences but bigger rooms (+ overflow room for key sessions) provide sufficient space for all those who want to attend the session. And of course all sessions are available on parleys.com anyway! Community votes on whiteboard - Devoxx attendees gets a chance to vote on topics ranging from their favorite non-Java language, operating system, or love from Oracle. Captured pictures at the end of Day 2 are shown below. Movie on the last but one night - This year it was The Adventures of Tintin and was lots of fun. Fries with mayo - This is a typical Belgian thing. Guys going in ladies room to avoid the long queues ... wow! Tweet wall everywhere and I mean literally everywhere, in rooms, hallways, front desk, and other places. The tweet picking algorithm was not very clear as I never saw my tweet appear on the wall ;-) You can also watch it at wall.devoxx.com. Cozy speaker dinner with great food and wine List of parallel and upcoming sessions displayed on the screen - This makes the information more explicit with the attendees. REST API with multiple mobile clients - This API is also used by some other conferences as well. And there always is iphone.devoxx.com. Steering committee members were recognized multiple times. The committee members were clearly identifiable wearing red hoodies. The wireless SSID was intuitive "Devoxx" but hidden to avoid some crap from Microsoft Windows. All of 9000 addresses were used up most of the times with each attendee having multiple devices. A 1 GB fibre optic cable was stretched to Metropolis to support the required network bandwidth. Stephan is already planning to upgrade the equipment and have a better infrastructure next year. Free water, soda, juice in a cooler Kinect connected to TV screens so that attendees can use their hands to browse through the list of sesssions. #devoxxblog, #devoxxwomen, #devoxxfrance, #devoxxgreat, #devoxxsuggestions And Devoxx attendees are called Devoxxians ... how cool is that ? :-) What other things do you think happen only at Devoxx ? And now the pictures from the community whiteboard: And a more complete album (including bigger pics of community votes) is available below:

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• Welcome To The Nashorn Blog

  - by jlaskey

  Welcome to all.  Time to break the ice and instantiate The Nashorn Blog.  I hope to contribute routinely, but we are very busy, at this point, preparing for the next development milestone and, of course, getting ready for open source. So, if there are long gaps between postings please forgive. We're just coming back from JavaOne and are stoked by the positive response to all the Nashorn sessions. It was great for the team to have the front and centre slide from Georges Saab early in the keynote. It seems we have support coming from all directions. Most of the session videos are posted. Check out the links. Nashorn: Optimizing JavaScript and Dynamic Language Execution on the JVM. Unfortunately, Marcus - the code generation juggernaut,  got saddled with the first session of the first day. Still, he had a decent turnout. The talk focused on issues relating to optimizations we did to get good performance from the JVM. Much yet to be done but looking good. Nashorn: JavaScript on the JVM. This was the main talk about Nashorn. I delivered the little bit of this and a little bit of that session with an overview, a follow up on the open source announcement, a run through a few of the Nashorn features and some demos. The room was SRO, about 250±. High points: Sam Pullara, from Twitter, came forward to describe how painless it was to get Mustache.js up and running (20x over Rhino), and,  John Ceccarelli, from NetBeans came forward to describe how Nashorn has become an integral part of Netbeans. A healthy Q & A at the end was very encouraging. Meet the Nashorn JavaScript Team. Michel, Attila, Marcus and myself hosted a Q & A. There was only a handful of people in the room (we assume it was because of a conflicting session ;-) .) Most of the questions centred around Node.jar, which leads me to believe, Nashorn + Node.jar is what has the most interest. Akhil, Mr. Node.jar, sitting in the audience, fielded the Node.jar questions. Nashorn, Node, and Java Persistence. Doug Clarke, Akhil and myself, discussed the title topics, followed by a lengthy Q & A (security had to hustle us out.) 80 or so in the room. Lots of questions about Node.jar. It was great to see Doug's use of Nashorn + JPA. Nashorn in action, with such elegance and grace. Putting the Metaobject Protocol to Work: Nashorn’s Java Bindings. Attila discussed how he applied Dynalink to Nashorn. Good turn out for this session as well. I have a feeling that once people discover and embrace this hidden gem, great things will happen for all languages running on the JVM. Finally, there were quite a few JavaOne sessions that focused on non-Java languages and their impact on the JVM. I've always believed that one's tool belt should carry a variety of programming languages, not just for domain/task applicability, but also to enhance your thinking and approaches to problem solving. For the most part, future blog entries will focus on 'how to' in Nashorn, but if you have any suggestions for topics you want discussed, please drop a line.  Cheers. 

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• There are 2 jobs available - which one sounds better all round [closed]

  - by Steve Gates

  I am currently employed at a company where we scrape by each year breaking even, sometimes having a little profit. The development environment is very relaxed and we have a laugh. My colleagues are not interested in improving their knowledge unless they have to, so trying to get them to adopt things like TDD is a non-starter. My development manager is stuck in .Net 2 land and refuses to use things like LINQ. He over complicates architecture and writes very unreadable code, heres an example SortedList<int,<SortedList<int,SortedList<int, MyClass>>>> The MD of the company has no drive and lets the one sales guy bring in the contracts. We are not busy all the time and this allows me time to look at new technology and learn. In terms of using things like TDD, my development manager has no problem with it and can kind of see the purpose of it, he just wont use it himself. This means I am alone in learning new things and am often resorting to StackOverflow to make sure I get things right. The company has a lot of flexibility, I can work from home if needs be and when my daughter was born they let me work from home 1 day a week however they expect this flexibility in return often asking me to travel occasionally on a Friday afternoon for the following week. Sometimes its abroad. We are also pretty much on call 24/5 as we have engineers in various countries. Also we have no testers so most of the testing is done by us developers and some testing by engineers. Either way no-one likes testing! I have been offered a role at a company I worked at 5 years ago. They were quite Victorian in their working practices but it appears to have relaxed now although I suspect still reasonably formal. There is a new team of developers I don't know and they are about to move to new offices. The team lead is a guy that was there when I was and I get the impression he takes his role seriously and likes his formal procedures and documentation. I think some of the Victorian practices may have rubbed off on him. However he did say if things crop up then as long as I can trust the person they can work at home although he prefers people in the office. The team uses SCRUM, TDD and SOLID design principles so they are quite up to date in technology. They are reasonably Microsoft focused. It appears the Technical Director might be the R&D man and research new technology on his own not allowing developers to play with new technology. He possibly might be a super developer and makes all the decisions that no can argue with. They are currently moving to Entity Framework away from NHibernate based on issues that their queries seem to fail sometimes and they feel NHibernate is stagnant. They have analysts and a QA team. The MD is focused and they are an expanding company making profit each year. I'm not sure what the team morale is and whether they have a laugh. When I had a tour around the office they were there in dead silence. I'm really unsure which role is the best for me and going with my gut instinct is useless as I'm not sure what my gut is telling me. Based on the information above which role would you choose and why?

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• Where to place web.xml outside WAR file for secure redirect?

  - by Silverhalide

  I am running Tomcat 7 and am deploying a bunch of applications delivered to me by a third party as WAR files. I'd like to force some of those apps to always use SSL. (All the "SSL" apps are in one service; other apps outside this discussion are in another service.) I've figured out how to use conf\web.xml to redirect apps from HTTP to HTTPS, but that applies to all applications hosted by Tomcat. I've also figured out how to put web.xml in an unpacked app's web-inf directory; that does the trick for that specific app, but runs the risk of being overwritten if our vendor gives us a new war file to deploy. I've also tried placing the web.xml file in various places under conf\service\host, or under appbase, but none seem to work. Is it possible to redirect some apps to SSL without forcing all apps to redirect, or to put the web.xml file inside the extracted WAR file? Here's my server.xml: <Service name="secure"> <Connector port="80" connectionTimeout="20000" redirectPort="443" URIEncoding="UTF-8" enableLookups="false" compression="on" protocol="org.apache.coyote.http11.Http11Protocol" compressableMimeType="text/html,text/xml,text/plain,text/javascript,application/json,text/css"/> <Connector port="443" URIEncoding="UTF-8" enableLookups="false" compression="on" protocol="org.apache.coyote.http11.Http11Protocol" compressableMimeType="text/html,text/xml,text/plain,text/javascript,application/json,text/css" scheme="https" secure="true" SSLEnabled="true" sslProtocol="TLS" keystoreFile="..." keystorePass="..." keystoreType="PKCS12" truststoreFile="..." truststorePass="..." truststoreType="JKS" clientAuth="false" ciphers="SSL_RSA_WITH_RC4_128_MD5,SSL_RSA_WITH_RC4_128_SHA,TLS_RSA_WITH_AES_128_CBC_SHA,TLS_DHE_RSA_WITH_AES_128_CBC_SHA,TLS_DHE_DSS_WITH_AES_128_CBC_SHA,SSL_RSA_WITH_AES_128_CBC_SHA"/> <Engine name="secure" defaultHost="localhost"> <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/> <Host name="localhost" appBase="webapps" unpackWARs="false" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false"> </Host> </Engine> </Service> <Service name="mutual-secure"> ... </Service> The content of the web.xml files I'm playing with is: <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0" metadata-complete="true"> <security-constraint> <web-resource-collection> <web-resource-name>All applications</web-resource-name> <url-pattern>/*</url-pattern> </web-resource-collection> <user-data-constraint> <description>Redirect all requests to HTTPS</description> <transport-guarantee>CONFIDENTIAL</transport-guarantee> </user-data-constraint> </security-constraint> </web-app> (For conf\web.xml the security-constraint is added just before the end of the existing file, rather than create a new file.) My webapps directory (currently) contains only the WAR files.

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• How to introduce a computer illiterate 50-year old to programming [closed]

  - by sunday

  The other day my dad asked me a question that I would have never expected from him. "How can I learn C++?" My dad is turning 56 this year and computers are a distant concept for him. He doesn't know how to use a phone very well besides calling numbers (no speed dial or contacts); though he has started to learn computers a little better - to the point that he knows how to open the internet (in Windows) and browse around (and has successfully completed several job applications entirely on his own online, of which he was offered positions too). But still, these are too narrow-windowed experiences to mean much, really. While he may not have the background, my dad knows how to read. And I mean reading as a skill, not just an ability. He has little to no college education (financial problems, family, etc.) and was fortunate enough to finish high school, but still taught himself to become a master electrician and has been one for almost 30 years now. He did the same with guitar, learning to play at a very professional level and has been praised for his skill. In high school, he picked up a weight lifting book - and was the only person in his high school at the time to qualify officially as an "athlete" by national standards. In all cases, he just needed something to read. Something to teach him. He absorbs information like a sponge. I have no doubt in my dad's motivation or capability of doing this, so my general goal is simply: Get my dad into the world of computers, and get him on the road to programming. I strongly believe that once I get him through the fundamentals, his drive and reading skill will keep him going on this own. So I'm asking you all: where should I start with all this? And what are the best resources out there? Should I get him to start Linux instead of Windows? Is C++ a bad idea? Remember, he needs to (IMO) learn computers first, and then get that first grasp (the "Hello world" experience) of programming. For money's sake and at top preference, I'd like free online resources that he can read, but by all means any good suggestions in print or paid-for-online are welcome (that I could possibly look into later to purchase). And also, I intend to start him off with C++ (no Python, Java, etc.), because I know it the best and will be able to help him along the way with code. (I have minimal knowledge right now in other languages). Edit: I'm getting a lot of persistent suggestions to use Python. The only reason I wanted to do C++ is that I KNOW it and can be THERE when my dad needs help. My VERY FIRST exposure to programming ever was Java. I learned Java, and I got good at it. I open to other suggestions, but please provide an effective application of your suggestions. EDIT #2: I understand my approach/thinking/knowledge could be lacking here. I'm a sophomore level undergraduate CS major. If you don't agree with anything in my post, tell me why - give me ideas, information - that's why I'm asking in the first place. To narrow down my general goal to specific reachable goals.

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• SSI: Failed String Comparison with CGI Environment Variable [migrated]

  - by Calyo Delphi

  I am currently working on developing a personal website. It's not my first time doing this, but this is my first major foray into implementing SSI. I've run myself into a wall, however, with an if-else directive that uses one of the CGI environment variables as part of its comparison. Even after some limited attempts at debugging, all of the output and documentation that I have means that the comparisons being made should fail outright. This is not the case, and the wrong evaluation is being made by the if-else directive. Here's the code in the file index.shtml: <head> <!--#set var="page" value="Home" --> <!--#include file="headlinks.shtml" --> <style> img#ref { float: right; margin-left: 8px; border-width: 0px; } </style> </head> Here's the code in the file headlinks.shtml: <title><!--#echo var="page" --> &ndash; <!--#echo var="HTTP_HOST" --></title> <!--#set var="docroot" value="${DOCUMENT_ROOT}" --> <!--#echo var="docroot" --> <!--#if expr="( $docroot != '/Applications/MAMP/htdocs' ) || ( $docroot != '/home/dragarch/public_html' )" --> <link rel="stylesheet" type="text/css" href="../style.css"> <link rel="shortcut icon" type="image/svg+xml" href="../favicon.svg" /> <!--#else --> <link rel="stylesheet" type="text/css" href="style.css"> <link rel="shortcut icon" type="image/svg+xml" href="favicon.svg" /> <!--#endif --> And here's the output for the file index.shtml: <title>Home &ndash; dragarch</title> /Applications/MAMP/htdocs <link rel="stylesheet" type="text/css" href="../style.css"> <link rel="shortcut icon" type="image/svg+xml" href="../favicon.svg" /> Both style.css and favicon.svg are in the document root with index.shtml, so the if directive should fail and default to the output of the else directive. As you can see, while the document root (which is currently the MAMP htdocs folder on my own notebook) is correct according to the output of the echo directive, the comparison in the if-else directive fails to compare the strings properly. I'm using this page for my documentation: http://httpd.apache.org/docs/2.2/mod/mod_include.html I'm at a complete loss as to why this is the case, and need a bit of help here. EDIT: I should note that dragarch is a hostname that I configured in /etc/hosts to point to 127.0.0.1 so I could test the site without having to use localhost. It has no real effect on the functionality of anything, other than to just act as a prettier hostname to use.

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• com.jcraft.jsch.JSchException: Auth cancel

  - by Dan Fabulich

  I'm trying to write an Ant script to retrieve an URL via port tunnelling. It works great when I use a password (the names xxxx'd out for privacy): <project default="main"> <target name="main"> <sshsession host="xxxx" username="xxxx" password="xxxx"> <LocalTunnel lport="1080" rhost="xxxx" rport="80"/> <sequential> <get src="http://localhost:1080/xxxx" dest="/tmp/xxxx"/> </sequential> </sshsession> </target> </project> But it doesn't work when I use a keyfile, like this: <sshsession host="xxxx" username="xxxx" keyfile="/Users/xxxx/.ssh/id_dsa" passphrase="xxxx"> <LocalTunnel lport="1080" rhost="xxxx" rport="80"/> <sequential> <get src="http://localhost:1080/xxxx" dest="/tmp/xxxx"/> </sequential> </sshsession> I get this exception: /tmp/build.xml:8: com.jcraft.jsch.JSchException: Auth cancel at com.jcraft.jsch.Session.connect(Session.java:451) at com.jcraft.jsch.Session.connect(Session.java:150) at org.apache.tools.ant.taskdefs.optional.ssh.SSHBase.openSession(SSHBase.java:223) I'm sure I'm using the correct keyfile (I've tried using the wrong name, which gives a legitimate FileNotFoundException). I can successfully ssh from the command line without being prompted for a password. I'm sure I'm using the correct passphrase for the keyfile. What's the cause of this error and what can I do about it?

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• Android ADT Eclipse plugin, parseSDKContent failed

  - by Sebastian Ganslandt

  I've just set up my first Android development environment consisting of Eclipse 3.5 Mac OSX 10.5 Android SDK for x86 macs ADT Eclipse plugin 0.9.6 I've set set $PATH to my SDK/tools directory (which shouldn't matter if I only use Eclipse right?) and started Eclipse, but when I try to set the path to the SDK in Eclipse, i get the error "parseSdkContent failed". The stack trace of from the thrown exception is java.lang.IllegalArgumentException: http://www.w3.org/2001/XMLSchema at javax.xml.validation.SchemaFactory.newInstance(SchemaFactory.java:181) at com.android.ide.eclipse.adt.internal.sdk.LayoutDevicesXsd.getValidator(Unknown Source) at com.android.ide.eclipse.adt.internal.sdk.LayoutDeviceManager.parseLayoutDevices(Unknown Source) at com.android.ide.eclipse.adt.internal.sdk.LayoutDeviceManager.loadDefaultLayoutDevices(Unknown Source) at com.android.ide.eclipse.adt.internal.sdk.LayoutDeviceManager.loadDefaultAndUserDevices(Unknown Source) at com.android.ide.eclipse.adt.internal.sdk.Sdk.<init>(Unknown Source) at com.android.ide.eclipse.adt.internal.sdk.Sdk.loadSdk(Unknown Source) at com.android.ide.eclipse.adt.AdtPlugin$13.run(Unknown Source) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) I can't see that I've missed anything in the setup process, according to the instructions it should basically just work out of the box. Any ideas as to why this might fail?

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• What good technology podcasts are out there?

  - by Michael Stum

  Yes, Podcasts, those nice little Audiobooks I can listen to on the way to work. With the current amount of Podcasts, it's like searching a needle in a haystack, except that the haystack happens to be the Internet and is filled with too many of these "Hot new Gadgets" stuff :( Now, even though I am mainly a .NET developer nowadays, maybe anyone knows some good Podcasts from people regarding the whole software lifecycle? Unit Testing, Continous Integration, Documentation, Deployment... So - what are you guys and gals listening to? Please note that the categorizations are somewhat subjective and may not be 100% accurate as many podcasts cover several areas. Categorization is made against what is considered the "main" area. General Software Engineering / Productivity Stack Overflow TekPub (Requires Paid Subscription) SE Radio 43 Folders Perspectives Dr. Dobb's (now a video feed) The Pragmatic Podcast (Inactive) IT Matters Agile Toolkit Podcast The Stack Trace (Inactive) Parleys Techzing The Startup Success Podcast Berkeley CS class lectures FOSS Weekly .NET / Visual Studio / Microsoft Herding Code Hanselminutes .NET Rocks! Deep Fried Bytes Alt.Net Podcast Polymorphic Podcast Sparkling Client (The Silverlight Podcast) dnrTV! Spaghetti Code ASP.NET Podcast Channel 9 Radio TFS PowerScripting Podcast The Thirsty Developer Elegant Code ConnectedShow Crafty Coders Coding QA jQuery yayQuery The official jQuery podcast Java / Groovy The Java Posse Grails Podcast Java Technology Insider Ruby / Rails Railscasts Rails Envy The Ruby on Rails Podcast Rubiverse Web Design / JavaScript / Ajax WebDevRadio Boagworld The Rissington podcast Ajaxian YUI Theater Unix / Linux / Mac / iPhone Mac Developer Network Hacker Public Radio Linux Outlaws Mac OS Ken LugRadio Linux radio show (Inactive) The Linux Action Show! Linux Kernel Mailing List (LKML) Summary Podcast Stanford's iPhone programming class SysAdmin, Security or Infrastructure RunAs Radio Security Now! Crypto-Gram Security Podcast Hak5 VMWare VMTN Windows Weekly PaulDotCom Security The Register - Semi-Coherent Computing FeatherCast General Tech / Business Tekzilla This Week in Tech The Guardian Tech Weekly PCMag Radio Podcast Entrepreneurship Corner Manager Tools Other / Misc. / Podcast Networks IT Conversations Retrobits Podcast No Agenda Netcast Cranky Geeks The Command Line Freelance Radio IBM developerWorks The Register - Open Season Drunk and Retired Technometria Sod This Radio4Nerds Hacker Medley

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• Invalid byte 1 of 1-byte UTF-8 sequence

  - by user275886

  I have a MyFaces Facelets application, where the page coding is a bit rugged. Anyway, it's developed with Eclipse and built with Ant, and kindof runs ok in Tomcat 2.0.26. So far so good. Now, I'd rather build with Maven, so I made a couple of pom-files, opened them in Netbeans and built, and now I have a war file that deploys ok. However, on any facelet page it barfs out with com.sun.org.apache.xerces.internal.impl.io.MalformedByteSequenceException: Invalid byte 1 of 1-byte UTF-8 sequence. at com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.invalidByte(UTF8Reader.java:684) at com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.read(UTF8Reader.java:554) at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.load(XMLEntityScanner.java:1742) So, I've tried a lot of different things, and the application actually run simple pages without facelet stuff. But, everything runs if I just build with Ant instead ... So my question is: What's the most likely difference between an ant build and a maven build that may cause this? It also seems that even though I've configured for UTF-8 in Netbeans and pom-files, Netbeans eventually ends up reporting the facelet files as ISO-8859-1 after some editing. I've made sure that most central libs are of same version (especially xerces 2.3.0), I've added an encoding servlet filter that had no effect. And, I'd rather fix the maven build and keep the buggy pages, than the other way around ... it's my intention to introduce Naven, not fix buggy pages.

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• OpenOffice with C# iterate throught all paragraphs and read text

  - by Darius Kucinskas

  How to iterate through all paragraphs in OpenOffice Writer document and output text. I have Java examples, but don't know how to convert code to C#. Java example could be found here: http://wiki.services.openoffice.org/wiki/API/Samples/Java/Writer/TextDocumentStructure My C# code: InitOpenOfficeEnvironment(); XMultiServiceFactory multiServiceFactory = connect(); XComponentLoader componentLoader = XComponentLoader)multiServiceFactory.createInstance("com.sun.star.frame.Desktop"); //set the property PropertyValue[] propertyValue = new PropertyValue[1]; PropertyValue aProperty = new PropertyValue(); aProperty.Name = "Hidden"; aProperty.Value = new uno.Any(false); propertyValue[0] = aProperty; XComponent xComponent = componentLoader.loadComponentFromURL( @"file:///C:/code/test3.doc", "_blank", 0, propertyValue); XEnumerationAccess xEnumerationAccess = (XEnumerationAccess)xComponent; XEnumeration xParagraphEnumeration = xEnumerationAccess.createEnumeration(); while ( xParagraphEnumeration.hasMoreElements() ) { // ??? // The problem is here nextElement() returns uno.Any but // I some how should get XTextContent???? uno.Any textElement = xParagraphEnumeration.nextElement(); // create another enumeration to get all text portions of //the paragraph XEnumeration xParaEnumerationAccess = textElement.createEnumeration(); //step 3 Through the Text portions Enumeration, //get interface to each individual text portion } xComponent.dispose(); xComponent = null;

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• Log in/out of Gmail chat programmatically, clicking Gmail's span "links"

  - by endolith

  At work, I use Gmail's chat, since it's encrypted and logs chats without installing or saving anything to the hard drive. At home, I use Pidgin. When I log into GMail at home, I have to log out of chat, or messages will end up in the wrong place. When I log into GMail at work, I have to log back in to chat. In other words, when I start Firefox at home, I want Gmail's chat disabled automatically. When I start Firefox at work, I want Gmail's chat enabled automatically. Is there a way to use a Greasemonkey script or similar to force logging in and logging out on specific machines? It would seem simple enough; just follow a URL or simulate clicking a link. Unfortunately, Gmail doesn't use actual links. While logged out: <span tabindex="0" role="link" action="si" class="az9OKd">Sign into chat</span> While logged in, in drop-down menu: <div tabindex="-1" id=":1mj" role="menuitem" class="oA" value="si"><div class="uQ c6"/>Sign into chat</div> <div tabindex="-1" id=":8f" role="menuitem" class="oA" value="sia"><div class="uQ c5"/>Sign into AIM®</div> <div tabindex="-1" id=":8e" role="menuitem" class="oA" value="so"><div class="uQ df"/>Sign out of chat</div> At bottom of page: <span id=":im" class="l8 ou" tabindex="0" role="link">turn off chat</span> <span id=":im" class="l8 ou" tabindex="0" role="link">turn on chat</span> Anyone know how to "click" these non-links with JavaScript or access their functions? I would imagine that "so" means "sign out", "si" means "sign in", and "sia" means "sign in AIM". Can I somehow call these actions directly? Is there some other alternative for disabling chat?

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• Android: HTTPClient

  - by primal

  Hi, I was trying http-cleint tutorials from svn.apache.org. While running the application I am getting the following error in console. [2010-04-30 09:26:36 - HalloAndroid] ActivityManager: java.lang.SecurityException: Permission Denial: starting Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.org.example/.HalloAndroid } from null (pid=-1, uid=-1) requires android.permission.INTERNET I have added android.permission.INTERNET in AndroidManifest.xml. <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.org.example" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".HalloAndroid" android:label="@string/app_name" android:permission="android.permission.INTERNET"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> <uses-permission android:name="android.permission.INTERNET"></uses-permission> </manifest> The java code in HalloAndroid.java is as follows HttpClient httpclient = new DefaultHttpClient(); HttpGet httpget2 = new HttpGet("http://google.com/"); HttpResponse response2 = null; try { response2 = httpclient.execute(httpget2); } catch (ClientProtocolException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } HttpEntity entity = response2.getEntity(); if (entity != null) { long len = entity.getContentLength(); if (len != -1 && len < 2048) { try { Log.d(TAG, EntityUtils.toString(entity)); } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } else { // Stream content out } Any help is much appreciated.

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• how to read user input from custom dialog in android?

  - by urobo

  I'd like to use a custom dialog built over an AlterDialog to obtain login info from the user. In this manner I first use the layoutinflater to get the layout and then put it in the AlertDialog.Builder.setView() method. LayoutInflater inflater = (LayoutInflater) Home.this.getSystemService(LAYOUT_INFLATER_SERVICE); layoutLogin = inflater.inflate(R.layout.login,(ViewGroup) findViewById(R.id.rl)); My layout consists of two textview and two editext for username and password respectively. Then I override the onCreateDialog method, checking the dialog id and putting all together, during the building phase I use the setButton(...) method to add a confirmation Button, neutral though: /* (non-Javadoc) * @see android.app.Activity#onCreateDialog(int) */ @Override protected Dialog onCreateDialog(int id) { AlertDialog d = null; AlertDialog.Builder builder = new AlertDialog.Builder(this); switch(id){ ... case Home.DIALOG_LOGIN: builder.setView(layoutLogin); builder.setMessage("Sign in to your DyCaPo Account").setCancelable(false); d=builder.create(); d.setTitle("Login"); Message msg = new Message(); msg.setTarget(Home.this.handleLogin); d.setButton(Dialog.BUTTON_NEUTRAL,"Sign in",msg); break; ... } return d; } Then I setup the Handler handleLogin: private Handler handleLogin= new Handler(){ /* (non-Javadoc) * @see android.os.Handler#handleMessage(android.os.Message) */ @Override public void handleMessage(Message msg) { String input = usernameInput.getText().toString(); //this should hold the EditText field for the username } }; which is just a stub up to now. what I don't get is when and where I have to access the two fields since I tried to save a reference to them but unfortunately I always get a null pointer exception. Can anyone tell me what I do wrong and give some guidelines to work with custom dialogs. Thanks in advance! :)

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• Finalizing a Cursor that has not been deactivated or closed non-fatal error

  - by arnold

  Hello all, i'm getting a "Finalizing a Cursor that has not been deactivated or closed" error on this piece of code. The code is used to fill a listview. Since it's a non-fatal error , there is no crash and all seems to works fine..but i don't like the error. If i close the cursor at the end of this code..the listview stay's empty. if i close the cursor in onStop , i get the same error. How do i fix this?? private void updateList() { DBAdapter db = new DBAdapter(this); db.open(); //load all waiting alarm mCursor=db.getTitles("state<2"); setListAdapter(new MyCursorAdapter(this, mCursor)); registerForContextMenu(getListView()); db.close(); } error : E/Cursor ( 2318): Finalizing a Cursor that has not been deactivated or closed. database = /data/data/xxxxxxxxxxxxxxx.db, table = alerts, query = SELECT _id, alert_id, E/Cursor ( 2318): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here E/Cursor ( 2318): at android.database.sqlite.SQLiteCursor.<init>(SQLiteCursor.java:210) E/Cursor ( 2318): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDr­iver.java: 53) E/Cursor ( 2318): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.j­ava: 1345) E/Cursor ( 2318): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java­: 1229) .... ....

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• How to solve validation error on xsi:noNamespaceSchemaLocation in jdoconfig.xml

  - by mamuso

  Since I updated today to GAE 1.7.2.1, I'm having validation errors in eclipse in all my jdoconfig.xml files. I have the default jdoconfig.xml content : [...] <jdoconfig xmlns="http://java.sun.com/xml/ns/jdo/jdoconfig" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://java.sun.com/xml/ns/jdo/jdoconfig"> [...] And eclipse validation throws: Referenced file contains errors (http://java.sun.com/xml/ns/jdo/jdoconfig). For more information, right click on the message in the Problems View and select "Show Details..." When clicking on details I can see a bunch of lines like: s4s-elt-character: Non-whitespace characters are not allowed in schema elements other than 'xs:appinfo' and 'xs:documentation'. Saw 'var_U = "undefined";'. In different lines and different content in "Saw ... " It occurs in every single project I start using the "New Web Application Project..." from the google plugin. So does anyone have this problem? Any fix?

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• feedparser - various errors

  - by Eiriks

  I need feedparser (se http://www.feedparser.org) for a project, and want to keep third party modules in a separate folder. I did this by adding a folder to my python path, and putting relevant modules there, among them feedparser. This first attempt to import feedparser resulted in import feedparser Traceback (most recent call last): File "", line 1, in File "/home/users/me/modules/feedparser.py", line 1 ed socket timeout; added support for chardet library ^ SyntaxError: invalid syntax I found the text "socket timeout; added..." in the comments at the bottom of the file, removed these comments, and tried again: import feedparser Traceback (most recent call last): File "", line 1, in File "/home/users/me/modules/feedparser.py", line 1 = [(key, value) for key, value in attrs if key in self.acceptable_attributes] ^ IndentationError: unexpected indent Ok, so some indent error. I made sure the indent in the function in question where ok (moved some line breaks down to no-indent). And tried again: import feedparser Traceback (most recent call last): File "", line 1, in File "/home/users/me/modules/feedparser.py", line 1 , value) for key, value in attrs if key in self.acceptable_attributes] ^ SyntaxError: invalid syntax As much I google, I cannot find anything wrong with the syntax: def unknown_starttag(self, tag, attrs): if not tag in self.acceptable_elements: if tag in self.unacceptable_elements_with_end_tag: self.unacceptablestack += 1 return attrs = self.normalize_attrs(attrs) attrs = [(key, value) for key, value in attrs if key in self.acceptable_attributes] _BaseHTMLProcessor.unknown_starttag(self, tag, attrs) Now what? Is my approach all wrong? Why do I keep producing these errors in a module that seems so well tested and trusted?

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• No Persistence provider for EntityManager named ...

  - by Robert A Henru

  I have my persistence.xml with the same name, using toplink, under META-INF directory. Then I have my code calling it with... EntityManagerFactory emfdb = Persistence.createEntityManagerFactory("agisdb"); Yet, I got the following error message 2009-07-21 09:22:41,018 [main] ERROR - No Persistence provider for EntityManager named agisdb javax.persistence.PersistenceException: No Persistence provider for EntityManager named agisdb at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:89) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:60) Here is the persistence.xml... <?xml version="1.0" encoding="UTF-8"?> <persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0"> <persistence-unit name="agisdb"> <class>com.agis.livedb.domain.AddressEntity</class> <class>com.agis.livedb.domain.TrafficCameraEntity</class> <class>com.agis.livedb.domain.TrafficPhotoEntity</class> <class>com.agis.livedb.domain.TrafficReportEntity</class> <properties> <property name="toplink.jdbc.url" value="jdbc:mysql://localhost:3306/agisdb"/> <property name="toplink.jdbc.driver" value="com.mysql.jdbc.Driver"/> <property name="toplink.jdbc.user" value="root"/> <property name="toplink.jdbc.password" value="password"/> </properties> </persistence-unit> </persistence> It should have been in the classpath... Yet, I got the above error... Really appreciate any help... Thanks

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• SOAP web client on Android

  - by BANSAL MOHIT

  Hi I am trying to create a web service client for the android but i am stuck really bad Attached is my code and WSDL file. Please help /* * To change this template, choose Tools | Templates * and open the template in the editor. */ package org.me.androidapplication1; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; import java.io.IOException; import java.util.logging.Level; import java.util.logging.Logger; import org.ksoap2.SoapEnvelope; import org.ksoap2.serialization.SoapObject; import org.ksoap2.serialization.SoapPrimitive; import org.ksoap2.serialization.SoapSerializationEnvelope; import org.ksoap2.transport.AndroidHttpTransport; import org.xmlpull.v1.XmlPullParserException; /** * * @author bansal */ public class MainActivity extends Activity { private String SOAP_ACTION = "http://src/getNews"; private String METHOD_NAME = "getNews"; private String NAMESPACE = "http://src/"; private static final String URL ="http://128.205.201.202:8080/RssService /RssServiceService?WSDL"; /** Called when the activity is first created. */ @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); TextView tv = new TextView(this); SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME); request.addProperty("ticker","NASDAQ:INFY"); SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11); envelope.setOutputSoapObject(request); AndroidHttpTransport androidHttpTransport = new AndroidHttpTransport(URL); try { androidHttpTransport.call(SOAP_ACTION, envelope); SoapPrimitive p = (SoapPrimitive) envelope.getResponse(); tv.setText("Response " + p); } catch (Exception ex) { ex.printStackTrace(); } setContentView(tv); // ToDo add your GUI initialization code here } } Thanks

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• Question on Scala Closure (From "Programming in Scala")

  - by Ekkmanz

  I don't understand why authors said that Code Listing 9.1 from "Programming in Scala" use closure. In chapter 9, they show how to refactor code into more less duplicated form, from this original code: object FileMatcher { private def filesHere = (new java.io.File(".")).listFiles def filesEnding(query: String) = for (file <- filesHere; if file.getName.endsWith(query)) yield file def filesContaining(query: String) = for (file <- filesHere; if file.getName.contains(query)) yield file def filesRegex(query: String) = for (file <- filesHere; if file.getName.matches(query)) yield file } To the second version: object FileMatcher { private def filesHere = (new java.io.File(".")).listFiles def filesMatching(query: String, matcher: (String, String) => Boolean) = { for (file <- filesHere; if matcher(file.getName, query)) yield file } def filesEnding(query: String) = filesMatching(query, _.endsWith(_)) def filesContaining(query: String) = filesMatching(query, _.contains(_)) def filesRegex(query: String) = filesMatching(query, _.matches(_)) } Which they said that there is no use of closure here. Now I understand until this point. However they introduced the use of closure to refactor even some more, shown in Listing 9.1: object FileMatcher { private def filesHere = (new java.io.File(".")).listFiles private def filesMatching(matcher: String => Boolean) = for (file <- filesHere; if matcher(file.getName)) yield file def filesEnding(query: String) = filesMatching(_.endsWith(query)) def filesContaining(query: String) = filesMatching(_.contains(query)) def filesRegex(query: String) = filesMatching(_.matches(query)) } Now they said that query is a free variable but I don't really understand why they said so? Since ""query"" seems to be passed from top method down to string matching function explicitly.

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• Intellij Javafx artifact - how do you make it?

  - by Louis Sayers

  I've been trying all day to turn my javafx application into a jar file. I'm using Java 1.7 update 7. Oracle has some information, but it just seems scattered all over the place. Intellij is almost doing the job, but I get the following error: java.lang.NoClassDefFoundError: javafx/application/Application Which seems to say that I need to tell java where the jfxrt.jar is... If I add this jar to my classpath info for the manifest build in intellij - ctrl+shift+alt+s - Artifacts - Output Layout tab - Class Path, then I get another error: Could not find or load main class com.downloadpinterest.code.Main It seems strange to have to include jfxrt.jar in my class path though... I've tried to create an ant script as well, but I feel like IntelliJ is 90% of the way there - and I just need a bit of help to figure out why I need to include jfxrt.jar, and why my Main class isn't being found (I'm guessing I need to add it to the classpath somehow?). Could anyone clue me up as to what is happening? I had a basic gui before which worked fine, but JavaFX seems to be making life complicated!

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• HTML to RTF Converter for .NET

  - by nickyt

  I've already seen lots of posts on the site for RTF to HTML and some other posts talking about some HTML to RTF converters, but I'm really trying to get a full breakdown of what is considered the most widely used commercial product, open source product or if people recommend going home grown. Apologies if you consider this a duplicate question, but I'm trying to create a product matrix to see what is the most viable for our application. I also think this would be helpful for others. The converter would be used in an ASP.NET 2.0 application (we're upgrading to 3.5 shortly but still sticking with WebForms) using SQLServer 2005 (soon 2008) as the DB. From reading a few posts, SautinSoft appears to be popular as a commercial component. Are there other commercial components that you'd recommend for converting HTML to RTF? Price does matter, but even if it's a little on the expensive side, please list it. For open source, I read that OpenOffice.org can be run as a service so that it can convert files. However, this appears to be only Java based. I imagine, I'd need some kind of interop to use this? What .NET open source components, if any, are out there for converting HTML to RTF? For home grown, is an XSLT the way to go with XHTML? If so, what component do you recommend for generating XHTML? Otherwise, what other home grown avenuses do you recommend. Also, please note that I currently don't care so much about RTF to HTML. If a commercial component offers this and the price is still the same, fine, otherwise please don't mention it.

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• Blank subreport in Jasper Reports

  - by Andy Chapman

  Hi all, I'm trying to launch a report that I created in iReport which contains a main report and a subreport. In iReport, the subreport launches fine and contains data, however when I try to launch it from within my java code, the subreport is blank. What I've done so far: I have a String parameter in the main report called "SUBREPORT" that is used to define the path to the subreport. E.g. value: "E:\java\ReportLauncher\reports\test_subreport1.jasper" The subreport expression in the main report is set to: $P{SUBREPORT} The subreport connection expression is: $P{REPORT_CONNECTION} I also have a subreport parameter defined called "INVOICE_NUMBER" that is set to $F{InviInvNo}, which maps to a field in the main report. In my java code, I have: HashMap<String, Object> paramHash = new HashMap(); paramHash.put("INVOICE_NUMBER", invoiceID); paramHash.put("REPORT_CONNECTION", this.conn); paramHash.put("SUBREPORT", subReportPath); JasperPrint jasperprint = JasperFillManager.fillReport(this.reportPath, paramHash, this.conn); The main report is created fine and is populated. The subreport area however is blank. Any thoughts for what I'm doing wrong? Thanks in advance, Andy.

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