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• How to generate a random alpha-numeric string in Java

  - by Todd

  I've been looking for a simple java algorithm to generate a pseudo-random alpha-numeric string. In my situation it would be used as a unique session/key identifier that would "likely" be unique over 500K+ generation (my needs don't really require anything much more sophisticated) . Ideally I would be able to specify a length depending on my uniqueness needs. For example, a generated string of length 12 might look something like "AEYGF7K0DM1X". Answers: I like @Apocalisp and @erickson's answers equally well. The only downside to @Apocalisp's answer is it requires an apache class. Thanks to both for the help!

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• Memory leak in Websphere 7 + EJB3, a lot of instances of ClassMapping

  - by user179168

  Hi, sorry for my english, I speak spanish. I recently migrate an application from ejb 2.x to ejb3 (approx. 300 entities), Im using WebSphere 7.0.0.9. After 10 hours of work, the system crash with an OutOfMemoryError. Analyzing the coredump, I see a lot of instance of the org.apache.openjpa.jdbc.meta.ClassMapping class (please see the attached a screenshot). I believe that the culprit is the list of ValueListeners of the Value class, but I'm not sure, and I dont know how to fix this problem. Thanks

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• Pig: Count number of keys in a map

  - by Donald Miner

  I'd like to count the number of keys in a map in Pig. I could write a UDF to do this, but I was hoping there would be an easier way. data = LOAD 'hbase://MARS1' USING org.apache.pig.backend.hadoop.hbase.HBaseStorage( 'A:*', '-loadKey true -caching=100000') AS (id:bytearray, A_map:map[]); In the code above, I want to basically build a histogram of id and how many items in column family A that key has. In hoping, I tried c = FOREACH data GENERATE id, COUNT(A_map); but that unsurprisingly didn't work. Or, perhaps someone can suggest a better way to do this entirely. If I can't figure this out soon I'll just write a Java MapReduce job or a Pig UDF.

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• Running PHP 5.1 and 5.2 on debian squeeze

  - by Keil

  I know that Debian Squeeze won't let me compile a PHP version (prior to 5.3.0). But I need them for migrating some tools: Joomla (1.0.10) and SugarCRM (4.2.1b). Actually, Joomla 1.0.10 can run on PHP 5.2, and SugarCRM on PHP 5.1. But both will complain running under PHP 5.3. So, I want to execute their upgrade process under their working PHP version, so after the upgrade, they may not complain anymore under PHP 5.3. FYI, Apache is not the only option I have as WebServer. Maybe I am wrong thinking this way, if so, please explain the differents steps I need. So the question is: How can I have these PHP versions running on Squeeze?

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• Reading a client's header from Python CGI script?

  - by jawonlee

  I'm writing a very simple web service, written in Python and run as CGI on an Apache server. According to Python docs (somewhere... I forgot where), I can use sys.stdin to read the data POSTed by a random client, and this has been working fine. However, I would like to be able to read the HTTP header information as well - incoming IP, user agent, and so on. I'd also like to keep it very simple for now, by using only Python libraries (so no mod-python). How do I do this?

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• PHP: How should I move my code from dev to production?

  - by Teddy

  I have created a PHP web-application. I have 3 environments: DEV, TEST, PROD. What's a good tool / business practice for me to move my PHP web-application code from DEV to TEST to the PROD environment? Realizing that my TEST environment still only connects to my TEST database; whereas, I need to PROD environment to connect to my PROD database. So the code is mostly the same, except that I need to change my TEST code once moved into PROD to connect to the PROD database and not TEST database. I've heard of people taking down Apache in such away that it doesn't allow new connections and once all the existing connections are idle it simply brings down the web server. Then people manually copy the code and then manually update the config files of the PHP application to also point to the PROD instance. That seems terribly dangerous. Does a best practice exists?

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• Separation of static and dynamic content in Java EE applications

  - by Dan

  We work with IBM products and we typically use IBM Http Servers (read Apache) as a reverse proxy for our application servers. For performance reasons we serve static content (.gif, .jpg, .css, .html etc.) from our http servers, to ease the burden a bit from the application server. So far, we have to distribute files to http server and configure it manually (writing custom scripts at best.) The problem is the effort needed to keep everything in synch, especially when you need to update the app. Does any Java EE product support this “out of the box”? Is there a way to have application server do this automatically, like in cluster configuration for example, where master node is in charge of distributing the application to other nodes and for keeping everything in synch.

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• Code Igniter - URL Rewrite

  - by André Alçada Padez

  Hey, i'm trying to get a project to work, but i am having trouble with the rewrite module. I'm running Wamp over Windows XP. I changed httpd.conf to change the root of localhost to: DocumentRoot "C:/wamp/www/project/docroot/" I have htaccess RewriteEngine On RewriteBase / my Apache has the rewrite module Activated. my base_url() in config.php is 'http://localhost/' in routes.php i have: $route['default_controller'] = "home"; $route['our-recipes'] = "recipes"; and more pairs when i point the browser to http://localhost/ i get the homepage of my site, but when i click on any internal link like to 'our-recipes' it loads but i get the same homepage, with the new url on the location bar. if i try to access 'http://localhost/recipes' i get the same result. this is my folder structure: Can anyone please solve this for me??

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• FLVParser problem

  - by mujer-esponja

  Hi! I am using apache tika 7.0, one of the classes, called FLVParser, which is used to extrac metadata from videos. But, when i try to use one of the methos in the class, i get this error in Eclipse: Multiple markers at this line Syntax error on token "parse", Identifier expected after this token Syntax error on token(s), misplaced construct(s) I don't know exactly the meaning of this, and i don't know how to continue. I add the poiece of code also: FLVParser VideoParser = new FLVParser(); VideoParser.parse(); //Here is the error message Any ideas, please?? I made the imports in the right way and the mave dependencies are right aswell. Thanks in advance!

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• Lightweight messaging (async invocations) in Java

  - by Sergey Mikhanov

  I am looking for lightweight messaging framework in Java. My task is to process events in a SEDA’s manner: I know that some stages of the processing could be completed quickly, and others not, and would like to decouple these stages of processing. Let’s say I have components A and B and processing engine (be this container or whatever else) invokes component A, which in turn invokes component B. I do not care if execution time of component B will be 2s, but I do care if execution time of component A is below 50ms, for example. Therefore, it seems most reasonable for component A to submit a message to B, which B will process at the desired time. I am aware of different JMS implementations and Apache ActiveMQ: they are too heavyweight for this. I searched for some lightweight messaging (with really basic features like messages serialization and simplest routing) to no avail. Do you have anything to recommend in this issue?

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• Is there equivalences between Microsoft and Oracle/Sun technologies?

  - by Junior Mayhé

  Hello is it possible to say what are the Microsoft equivalents technologies compared to Sun? For example: Microsoft | Sun --------------------------------------------------------------- Visual Studio | Eclipse? IIS | Apache? ASP.NET | JSP, JSF ? SQL Server | Java DB ? ADO.NET Entity Data Model | ??? ASP.NET MVC | ??? Windows Presentation Foundation | Java FX? Windows Communication Foundation | ??? ASP.NET AJAX Toolkit | ??? Reporting Services/RDLC | ??? LINQ to SQL Classes | ??? Windows Forms | ???

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• Is it actually possible to connect to ActiveMQ via XMPP and query/browse queues using "AciveMQ.Agen

  - by Oleg Kiorsak

  I tried what I think are 4 most popular XMPP (aka "Jabber") clients (Spark, Pidgin, Psi, Pandion) to connect to ActiveMQ instance (Apache ActiveMQ ver. 5.3.0) on XMMP connector with an idea to use the "AciveMQ.Agent chatroom" for querying queues/etc and no success at all Some of them fail with 'Unknown error', some don't fail but kind of "hang"... interestingly, some communication does indeed reach the ActiveMQ side, because when I close a client it spits an exception "could not close" or something to that effect... and if I try "register new user" option (present on most clients" the ActiveMQ also spits some most cryptic warning message But I was never able to get to the point when I could see or specify "ActiveMQ.Agent" as chatroom and issue any commands... Before I waste any more time on this curious feature, I would like to hear whether anyone had any success with it? Thank you! PS: BTW, the book "ActiveMQ in Action book" http://www.manning.com/snyder/ shows that it is apparently works and is very easy using some Mac client (AdiumX), but I wanted it on a Windows PC ;)

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• Is it possible to put myBatis (iBatis) xml mappers outside the project?

  - by kospiotr

  According to the user guide i am able to use file path instead of resource: // Using classpath relative resources <mappers> <mapper resource="org/mybatis/builder/AuthorMapper.xml"/> </mappers> // Using url fully qualified paths <mappers> <mapper url="file:///var/sqlmaps/AuthorMapper.xml"/> </mappers> in my project I'm trying to put my mapper xml "outside" the project and i'm doing this: <mapper url="file://D:/Mappers/ComponentMapper1.xml" /> The output of my log4j console: Error building SqlSession. The error may exist in file://D:/Mappers/ComponentMapper1.xml Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.net.UnknownHostException: D Is it bug or it's me doing something wrong?

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• FileInputStream for a generic file System

  - by Akhil

  I have a file that contains java serialized objects like "Vector". I have stored this file over Hadoop Distributed File System(HDFS). Now I intend to read this file (using method readObject) in one of the map task. I suppose FileInputStream in = new FileInputStream("hdfs/path/to/file"); wont' work as the file is stored over HDFS. So I thought of using org.apache.hadoop.fs.FileSystem class. But Unfortunately it does not have any method that returns FileInputStream. All it has is a method that returns FSDataInputStream but I want a inputstream that can read serialized java objects like vector from a file rather than just primitive data types that FSDataInputStream would do. Please help!

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• Testing Java Classes with JMeter

  - by Martin Dürrmeier

  I'd like to test a Java Service Call. My first attempt was to use the "Java Request Sampler" The docu says This sampler lets you control a java class that implements the JavaSamplerClient interface. I'm not sure how to get the org.apache.jmeter.protocol.java.sampler.JavaSamplerClient Interface as there is no Maven Artifact nor provided binaries on the JMeter side. Just a JMeter Maven Plugin (which is not what I'm looking for). I could install the needed binaries in my local Maven Repository, I Just don't know where they are available. Wondering if anybody at all is using the "Java Request Sampler" ? P.S. Maybe I should try the JUnit Sampler

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• How to use LocalValueBean in jsp page.

  - by Himanshu

  I have set certain bean label and bean value in one of my dao class.. I have created a list of LocalValueBean objects and passed it as a list to jsp.. now here at jsp i need to print the label seperately and on hover to the label i need to show the value.. i need to exttract or to say get those values in jsp directly... i have also imported the org.apache.struts.util.LabelValueBean in my jsp but still its not working.. please let me know if you any ideas...

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• Weirdest PHP error

  - by yes123

  I found in my error log this [12-Nov-2011 19:22:26] PHP Warning: Attempt to assign property of non-object in on line 1768776801 [12-Nov-2011 19:22:31] PHP Warning: Attempt to assign property of non-object in on line 1768776801 [12-Nov-2011 19:22:39] PHP Warning: Attempt to assign property of non-object in on line 1768776801 [12-Nov-2011 19:22:40] PHP Warning: Attempt to assign property of non-object in on line 1768776801 [12-Nov-2011 19:22:46] PHP Warning: Attempt to assign property of non-object in on line 1768776801 [12-Nov-2011 19:22:51] PHP Warning: Attempt to assign property of non-object in on line 1768776801 Of course I don't have any script with 1 bn lines. PHP Version 5.3.3-7 Apache 2 The other weird thing is that I have a set_error_handler( 'myHandler' ); To write in the error log other inforamtion too, but with this error it seems PHP just ignores my error_handler =/ I don't have any code that can generate this errore before my call to set_error_handler

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• PHP APC - Why is loading cached array op codes slow?

  - by Aaron Kreider

  I'm using APC to reduce my loading time for my PHP files. My files load very fast, except for one file where I define more than 100 arrays. This 270 kb file takes 200 ms to load. The rest of the files are full of objects, methods, and functions. I'm wondering: does OP code caching not work as well for arrays? My APC cache should be big enough to handle all of my classes. Currently 40% of my cache is free. My hit rate is 99%. apc.shm_size=32 M apc.max_file_size = 1M apc.shm_segments= 1 APC 3.1.6 I'm using PHP 5.2, Apache 2, and Windows Vista.

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• NETBEANS JAVADB - How do I integrate a JavaDB DataBase into my main Java Package

  - by Stefanos Kargas

  JAVA I am working on a desktop application which uses JavaDB. I am using NetBeans 6.8 and JDK 6 Update 20 I created the database I need and connected to it through my application using ClientDriver: String driver = "org.apache.derby.jdbc.ClientDriver"; String connectionURL = "jdbc:derby://localhost:1527/myDB;create=true;user=user;password=pass"; try { Class.forName(driver); } catch (java.lang.ClassNotFoundException e) { e.printStackTrace(); } try { schedoDBConnection = DriverManager.getConnection(connectionURL); } catch (Exception e) { e.printStackTrace(); } This works fine. But in that case the service of the database comes from NetBeans. If I move my application to another PC I won't be able to access my database. How can I integrate my JavaDB into my application?

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• Java - Iterator: "Syntax error, parameterized types are only available if source level is 5.0"

  - by Helpme

  Hi! I'm purposely targeting Java OS 1.4.2 I'm trying to use an iterator combined with apache's POI to read an excel spreadsheet. The code runs perfectly in java 1.5, but in the 1.4.2 version I get the error listed in the question subject. the code is: Iterator myIter = null; it breaks on that line of code, which is clearly at the beginning of the application. I dont understand what needs to be done to correct this issue. Please let me know if you have any insight!

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• Java: Embedded Data Base

  - by Dmitry

  Hello! I want to create a desctop application with an embedded data base. Data base is JavaDB(Derby). I have connected a jar file derby.jar to my project. The problem is I don't understand how to register a driver to use this data base. It is said that I should use Class.forName("org.apache.derby.jdbc.EmbeddedDriver") But what if that was another data base and its driver was not in a java standart package? As you can see I'm confused with this. I want to know, how to use my connected derby.jar, how to work with its jdbc driver and how to create tables in a specified directory. Please, give as detailed answer, as you can. (I'm a dummy in this =)) )

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• Unable to delete file locked by same process -- weird!

  - by user300266

  I have an application written in PHP that uses a COM dll written in C#. The dll creates an image file by combining two other image files. The PHP script then takes over to do the housekeeping tasks of deleting the two source files and renaming the resulting combined file. The problem is the PHP script can't delete one of the source files because it's locked. The weird thing is that the process that has it locked is itself which in this case is the Apache Web Server. I have tried altering the C# dll to dispose of all bitmap and graphics objects prior to exiting, and yet the lock remains. My question is, what can I do to get the dll to let go and release the file locks. This is very frustrating.

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• Any foundation to administrate an Android open source application?

  - by Nicolas Raoul

  Our open source application is quite popular, and we are many developers. The app uses my Android Market account, and I shared the keys with a developer. But if both of us disappear, the application's Market account will be lost, and all users trapped. Giving the keys to all developers is not a solution either, for security reasons. Is there a foundation (like in Mozilla Foundation or Apache Foundation) that could accept to hold our Android Market account and release new versions in accordance with their own guidelines and our community consensus? There are quite a lot of Open Source foundations, but I could not find any that tackles this particular aspect of Android applications.

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• BlazeDS rejected connection from some IP address

  - by Shamal Karunarathne

  Hi, I'm using the BlazeDS binary version with Apache tomcat 6.0. And it seems there's a developer mode active and it only allows 3 IPs to connect to the application (Server). This is what the log says: [BlazeDS]MessageBroker '__default__' rejected connection from address 'xxx.xxx.xx.x'; Developer mode addresses already in use: xxx.x.xxx.xx, xxx.xxx.xxx.xxx, xx.xxx.xxx.xx (IP addresses are masked with 'x' for privacy) I have not added any special configuration to make developer mode active. I couldn't find any resources related to this scenario either. Please help. Thanks in Advance.

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• Generate Javadoc for interfaces only using Ant script?

  - by ipkiss

  Hi all, I am using Apache Ant to generate Javadoc for my program which has many projects(or modules). However, I just want to generate Javadoc for Interfaces ONLY and I do not know how to check if a file is a class or interface in Ant. Someone suggested me that I should use and specify a list of files to exclude or include. However, there are hundreds of files in my program and specifying a list of class files to exclude is impossible. Does anyone have some ideas, please?

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