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• Java Spotlight Episode 149: Geertjan Wielenga on NetBeans 7.4 @netbeans @geertjanw

  - by Roger Brinkley

  Interview with Geertjan Wielenga on the NetBeans 7.4 release Right-click or Control-click to download this MP3 file. You can also subscribe to the Java Spotlight Podcast Feed to get the latest podcast automatically. If you use iTunes you can open iTunes and subscribe with this link: Java Spotlight Podcast in iTunes. Show Notes News Everything in JavaFX is open sourced - Media is now opensource openjdk email Java SE 7 Update 45 Released 7u45 Caller-Allowable-Codebase and Trusted-Library Updated Security Baseline (7u45) impacts Java 7u40 and before with High Security settings What to do if your applet is blocked or warns of “mixed code”? LiveConnect changes in 7u45 JDK 8 end-game details and proposal for making a few exceptions Events Oct 28-30, JAX London, London Nov 4-8, Oredev, Malmö, Sweden Nov 6, JFall, Amsterdam, Netherlands Nov 11-15, Devoxx, Belgium Feature Interview Geertjan Wielenga is a principal product manager in Oracle for NetBeans and has been a member of the NetBeans Team for the past 7 years. NetBeans twitter: https://twitter.com/netbeans Geertjan’s twitter: https://twitter.com/geertjanw The Top Ten Coolest Features in NetBeans IDE 7.4 What’s Cool Nighthacking with James Gosling Arun Gupta waves goodbye and says hello JavaOne 2013 Roundup: Java 8 is Revolutionary, Java is back Survey on Java erasure/reification

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• Creating Java Neural Networks

  - by Tori Wieldt

  A new article on OTN/Java, titled “Neural Networks on the NetBeans Platform,” by Zoran Sevarac, reports on Neuroph Studio, an open source Java neural network development environment built on top of the NetBeans Platform. This article shows how to create Java neural networks for classification.From the article:“Neural networks are artificial intelligence (machine learning technology) suitable for ill-defined problems, such as recognition, prediction, classification, and control. This article shows how to create some Java neural networks for classification. Note that Neuroph Studio also has support for image recognition, text character recognition, and handwritten letter recognition...”“Neuroph Studio is a Java neural network development environment built on top of the NetBeans Platform and Neuroph Framework. It is an IDE-like environment customized for neural network development. Neuroph Studio is a GUI that sits on top of Neuroph Framework. Neuroph Framework is a full-featured Java framework that provides classes for building neural networks…”The author, Zoran Sevarac, is a teaching assistant at Belgrade University, Department for Software Engineering, and a researcher at the Laboratory for Artificial Intelligence at Belgrade University. He is also a member of GOAI Research Network. Through his research, he has been working on the development of a Java neural network framework, which was released as the open source project Neuroph.Brainy stuff. Read the article here.

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• Java Spotlight Episode 112: Joonas Lehiten on @Vaadin

  - by Roger Brinkley

  Interview with Joonas Lehtinen on Vaadin. Right-click or Control-click to download this MP3 file. You can also subscribe to the Java Spotlight Podcast Feed to get the latest podcast automatically. If you use iTunes you can open iTunes and subscribe with this link:  Java Spotlight Podcast in iTunes. Show Notes News Java Smart Metering video JavaFX for Tablets and Mobile survey on FXExperience Muliple JSR Migrating to the Latest JCP Version A number of JEPs added to  JDK 8 features and JDK 8 Milestones Adopt-a-JSR for Java EE 7 Events Dec 14-15, IndicThreads, Pune, India Dec 20, 9:30am JCP Spec Lead Call December on Developing a TCK Jan 15-16, JCP EC Face to Face Meeting, West Coast USA Feature InterviewJoonas Lehtinen started the development of Vaadin, a Java-based open source framework for building business-oriented Rich Internet Applications. He has been developing applications for the web since 1995 with a strong focus on Ajax and Java. He is also the founder and CEO of the company behind the Vaadin framework. What’s Cool Hinkmond Wong’s work with RasberryPI and Java Embedded GPIO Collaborative Whiteboard using WebSocket

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• How do I restrict concurrent statistics gathering to a small set of tables from a single schema?

  - by Maria Colgan

  I got an interesting question from one of my colleagues in the performance team last week about how to restrict a concurrent statistics gather to a small subset of tables from one schema, rather than the entire schema. I thought I would share the solution we came up with because it was rather elegant, and took advantage of concurrent statistics gathering, incremental statistics, and the not so well known “obj_filter_list” parameter in DBMS_STATS.GATHER_SCHEMA_STATS procedure. You should note that the solution outline below with “obj_filter_list” still applies, even when concurrent statistics gathering and/or incremental statistics gathering is disabled. The reason my colleague had asked the question in the first place was because he wanted to enable incremental statistics for 5 large partitioned tables in one schema. The first time you gather statistics after you enable incremental statistics on a table, you have to gather statistics for all of the existing partitions so that a synopsis may be created for them. If the partitioned table in question is large and contains a lot of partition, this could take a considerable amount of time. Since my colleague only had the Exadata environment at his disposal overnight, he wanted to re-gather statistics on 5 partition tables as quickly as possible to ensure that it all finished before morning. Prior to Oracle Database 11g Release 2, the only way to do this would have been to write a script with an individual DBMS_STATS.GATHER_TABLE_STATS command for each partition, in each of the 5 tables, as well as another one to gather global statistics on the table. Then, run each script in a separate session and manually manage how many of this session could run concurrently. Since each table has over one thousand partitions that would definitely be a daunting task and would most likely keep my colleague up all night! In Oracle Database 11g Release 2 we can take advantage of concurrent statistics gathering, which enables us to gather statistics on multiple tables in a schema (or database), and multiple (sub)partitions within a table concurrently. By using concurrent statistics gathering we no longer have to run individual statistics gathering commands for each partition. Oracle will automatically create a statistics gathering job for each partition, and one for the global statistics on each partitioned table. With the use of concurrent statistics, our script can now be simplified to just five DBMS_STATS.GATHER_TABLE_STATS commands, one for each table. This approach would work just fine but we really wanted to get this down to just one command. So how can we do that? You may be wondering why we didn’t just use the DBMS_STATS.GATHER_SCHEMA_STATS procedure with the OPTION parameter set to ‘GATHER STALE’. Unfortunately the statistics on the 5 partitioned tables were not stale and enabling incremental statistics does not mark the existing statistics stale. Plus how would we limit the schema statistics gather to just the 5 partitioned tables? So we went to ask one of the statistics developers if there was an alternative way. The developer told us the advantage of the “obj_filter_list” parameter in DBMS_STATS.GATHER_SCHEMA_STATS procedure. The “obj_filter_list” parameter allows you to specify a list of objects that you want to gather statistics on within a schema or database. The parameter takes a collection of type DBMS_STATS.OBJECTTAB. Each entry in the collection has 5 feilds; the schema name or the object owner, the object type (i.e., ‘TABLE’ or ‘INDEX’), object name, partition name, and subpartition name. You don't have to specify all five fields for each entry. Empty fields in an entry are treated as if it is a wildcard field (similar to ‘*’ character in LIKE predicates). Each entry corresponds to one set of filter conditions on the objects. If you have more than one entry, an object is qualified for statistics gathering as long as it satisfies the filter conditions in one entry. You first must create the collection of objects, and then gather statistics for the specified collection. It’s probably easier to explain this with an example. I’m using the SH sample schema but needed a couple of additional partitioned table tables to get recreate my colleagues scenario of 5 partitioned tables. So I created SALES2, SALES3, and COSTS2 as copies of the SALES and COSTS table respectively (setup.sql). I also deleted statistics on all of the tables in the SH schema beforehand to more easily demonstrate our approach. Step 0. Delete the statistics on the tables in the SH schema. Step 1. Enable concurrent statistics gathering. Remember, this has to be done at the global level. Step 2. Enable incremental statistics for the 5 partitioned tables. Step 3. Create the DBMS_STATS.OBJECTTAB and pass it to the DBMS_STATS.GATHER_SCHEMA_STATS command. Here, you will notice that we defined two variables of DBMS_STATS.OBJECTTAB type. The first, filter_lst, will be used to pass the list of tables we want to gather statistics on, and will be the value passed to the obj_filter_list parameter. The second, obj_lst, will be used to capture the list of tables that have had statistics gathered on them by this command, and will be the value passed to the objlist parameter. In Oracle Database 11g Release 2, you need to specify the objlist parameter in order to get the obj_filter_list parameter to work correctly due to bug 14539274. Will also needed to define the number of objects we would supply in the obj_filter_list. In our case we ere specifying 5 tables (filter_lst.extend(5)). Finally, we need to specify the owner name and object name for each of the objects in the list. Once the list definition is complete we can issue the DBMS_STATS.GATHER_SCHEMA_STATS command. Step 4. Confirm statistics were gathered on the 5 partitioned tables. Here are a couple of other things to keep in mind when specifying the entries for the  obj_filter_list parameter. If a field in the entry is empty, i.e., null, it means there is no condition on this field. In the above example , suppose you remove the statement Obj_filter_lst(1).ownname := ‘SH’; You will get the same result since when you have specified gather_schema_stats so there is no need to further specify ownname in the obj_filter_lst. All of the names in the entry are normalized, i.e., uppercased if they are not double quoted. So in the above example, it is OK to use Obj_filter_lst(1).objname := ‘sales’;. However if you have a table called ‘MyTab’ instead of ‘MYTAB’, then you need to specify Obj_filter_lst(1).objname := ‘”MyTab”’; As I said before, although we have illustrated the usage of the obj_filter_list parameter for partitioned tables, with concurrent and incremental statistics gathering turned on, the obj_filter_list parameter is generally applicable to any gather_database_stats, gather_dictionary_stats and gather_schema_stats command. You can get a copy of the script I used to generate this post here. +Maria Colgan

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• Java Embedded @ JavaOne Call for Papers

  - by arungupta

  Do you care about Internet of Things ? Interested in sharing your experience at javaOne about how you are using Java Embedded Technology to realize this vision ? At Java Embedded @ JavaOne, C-level executives, architects, business leaders, and decision makers from around the globe will come together to learn how Java Embedded technologies and solutions offer compelling value and a clear path forward to business efficiency and agility. The conference will feature dedicated business-focused content from Oracle discussing how Java Embedded delivers a secure, optimized environment ideal for multiple network-based devices, as well as meaningful industry-focused sessions from peers who are already successfully utilizing Java Embedded. Submit your papers for Business Track or Technical Content related to Embedded Java to be presented at JavaOne here. Speakers for accepted sessions will receive a complimentary pass to the event for which their session is submitted. Note, the CFP for the main JavaOne conference is over, speakers notified, and content catalog published. This is CFP only for Java Embedded @ JavaOne. Some key dates are: Jul 8th: Call for Papers closes Week of Jul 29th: Notifications sent Conference Dates: Oct 3, 4, 2012 And the main conference website is oracle.com/javaone/embedded.

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• SSH tunnel for socks5 proxy is slow with concurrent load

  - by RawwrBag

  I ssh to a remote AWS server using Ubuntu. I use ssh's port forwarding capabilities to do this. I have tried forwarding a dynamic port (ssh -D) or a single port (ssh -L with dante running as a remote socks server). Both are equally slow. I also tried different ciphers (ssh -c). Concurrent TCP connections pretty much do not work. For example, I can go to speedtest.net and start a test (which is fairly fast, probably maxes out my line speed) and if I try and do anything (i.e. load google.com) while the test is still running, all the additional connections seem to hang until the speed test is over. I realize OpenSSH is single-threaded. Is this the problem? It doesn't even show up on my top. Same goes for sshd on the remote server -- no processor hit. Is there anyway to bump ssh performance or should I step up to OpenVPN or something better suited for this?

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• Java Champion Dick Wall Explores the Virtues of Scala (otn interview)

  - by Janice J. Heiss

  In a new interview up on otn/java, titled “Java Champion Dick Wall on the Virtues of Scala (Part 2),” Dick Wall explains why, after a long career in programming exploring Lisp, C, C++, Python, and Java, he has finally settled on Scala as his language of choice. From the interview: “I was always on the lookout for a language that would give me both Python-like productivity and simplicity for just writing something and quickly having it work and that also offers strong performance, toolability, and type safety (all of which I like in Java). Scala is simply the first language that offers all those features in a package that suits me. Programming in Scala feels like programming in Python (if you can think it, you can do it), but with the benefit of having a compiler looking over your shoulder and telling you that you have the wrong type here or the wrong method name there.The final ‘aha!’ moment came about a year and a half ago. I had a quick task to complete, and I started writing it in Python (as I have for many years) but then realized that I could probably write it just as fast in Scala. I tried, and indeed I managed to write it just about as fast.”Wall makes the remarkable claim that once Java developers have learned to work in Scala, when they work on large projects, they typically find themselves more productive than they are in Java. “Of course,” he points out, “people are always going to argue about these claims, but I can put my hand over my heart and say that I am much more productive in Scala than I was in Java, and I see no reason why the many people I know using Scala wouldn’t say the same without some reason.”Read the interview here.

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• 100% CPU when doing 4 or more concurrent requests with Magento

  - by pancake

  Currently I'm having trouble with a server running Magento, it's unbelievably slow. It's a VPS with a few Magento installations on it used for development, so I'm the only one using them. When I do 4 request all 2 seconds after each other I'm finished in 10 seconds. Slow, but still within the limits of my patience. When I do 4 "concurrent" requests, however (opening 4 tabs in a row, very quickly) all four cores go to 100% and stay there for like a minute. How is this possible? I know that there are a lot of possibilities here, so any tips on how to make an Apache/PHP server go faster are also welcome. It used to go a lot faster before, and I've also tried APC, but it kept causing problems (PHP errors, something with memory pools) so I've disabled it. By the way, the Magento cache is off and compiling is also off. I know this makes Magento slower than usual, but I don't think a 60 second response time is normal for any Magento installation. Virtual hardware: 4 Cores and 4096MB RAM Swap is never used (checked with htop) 100GB disk space, of which 10% is in use Software: Debian 6 DirectAdmin and apache custombuild PHP 5.2.17 (CLI) If you need more info, please tell me how to get it, because I probably don't know how. I do know how to use the command line in linux and the usage of quite a few commands, but my experience with managing a server is limited.

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• background in JAVA [closed]

  - by leen.zd

  how can i put a background image in my java code? this is my code... what's error? import java.awt.Container; import java.awt.Dimension; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import javax.swing.JFrame; import javax.swing.JPanel; public class background extends JFrame { private Container c; private JPanel imagePanel; public background() { initialize(); } private void initialize() { setDefaultCloseOperation(EXIT_ON_CLOSE); c = getContentPane(); imagePanel = new JPanel() { public void paint(Graphics g) { try { BufferedImage image = ImageIO.read(new File("http://www.signe-zodiaque.com/images/signes/balance.jpg")); g.drawImage(image, 1000, 2000, null); } catch (IOException e) { e.printStackTrace(); } } }; imagePanel.setPreferredSize(new Dimension(640, 480)); c.add(imagePanel); }

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• Notification framework for java

  - by rmarimon

  I'm in the process of developing a web application (java + jsp) that can send notifications to users. The user can subscribe to multiple events generated by the application and can choose to receive the messages associated with those events via multiple channels (email, sms, growl?, messenger); perhaps different messages through different channels; perhaps a daily message digest. Everything must be configurable by the user. Is there some framework that deals with this?

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• Automating HP Quality Center with Python or Java

  - by Hari

  Hi, We have a project that uses HP Quality Center and one of the regular issues we face is people not updating comments on the defect. So I was thinkingif we could come up with a small script or tool that could be used to periodically throw up a reminder and force the user to update the comments. I came across the Open Test Architecture API and was wondering if there are any good Python or java examples for the same that I could see. Thanks Hari

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• Error code:-2147467259 Error code name:failed Java desktop application Cristal Report XI

  - by maverick-f14

  Hi guys, I'm trying to run Java_JRC_Desktop_View_Report_and_set_database_logon downloaded from this link: http://www.sdn.sap.com/irj/boc/index?rid=/library/uuid/d0d6f979-3e11-2c10-35a8-ac93994a30ed but at runtime my java desktop application throws this Exception: com.crystaldecisions.sdk.occa.report.lib.ReportSDKException: org/apache/log4j/Logger---- Error code:-2147467259 Error code name:failed From what depends? thx all.

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• java 7 upgrade and hibernate annotation processor error

  - by Bill Turner

  I am getting the following warning, which seems to be triggering a subsequent warning and an error. I have been googling like mad, though have not found anything that makes it clear what it is I should do to resolve this. This issue occurs when I execute an Ant build. I am trying to migrate our project to Java 7. I have changed all the source='1.6' and target="1.6" to 1.7. I did find this related article: Forward compatible Java 6 annotation processor and SupportedSourceVersion It seems to indicate that I should build the Hibernate annotation processor jar myself, compiling it with with 1.7. It does not seem I should be required to do so. The latest version of the class in question (in hibernate-validator-annotation-processor-5.0.1.Final.jar) has been compiled with 1.6. Since the code in said class refers to SourceVersion.latestSupported(), and the 1.6 of that returns only RELEASE_6, there does not seem to be a generally available solution. Here is the warning: [javac] warning: Supported source version 'RELEASE_6' from annotation processor 'org.hibernate.validator.ap.ConstraintValidationProcessor' less than -source '1.7' And, here are the subsequent warnings/error. [javac] warning: No processor claimed any of these annotations: javax.persistence.PersistenceContext,javax.persistence.Column,org.codehaus.jackson.annotate.JsonIgnore,javax.persistence.Id,org.springframework.context.annotation.DependsOn,com.trgr.cobalt.infrastructure.datasource.Bucketed,org.codehaus.jackson.map.annotate.JsonDeserialize,javax.persistence.DiscriminatorColumn,com.trgr.cobalt.dataroom.authorization.secure.Secured,org.hibernate.annotations.GenericGenerator,javax.annotation.Resource,com.trgr.cobalt.infrastructure.spring.domain.DomainField,org.codehaus.jackson.annotate.JsonAutoDetect,javax.persistence.DiscriminatorValue,com.trgr.cobalt.dataroom.datasource.config.core.CoreTransactionMandatory,org.springframework.stereotype.Repository,javax.persistence.GeneratedValue,com.trgr.cobalt.dataroom.datasource.config.core.CoreTransactional,org.hibernate.annotations.Cascade,javax.persistence.Table,javax.persistence.Enumerated,org.hibernate.annotations.FilterDef,javax.persistence.OneToOne,com.trgr.cobalt.dataroom.datasource.config.core.CoreEntity,org.springframework.transaction.annotation.Transactional,com.trgr.cobalt.infrastructure.util.enums.EnumConversion,org.springframework.context.annotation.Configuration,com.trgr.cobalt.infrastructure.spring.domain.UpdatedFields,com.trgr.cobalt.infrastructure.spring.documentation.SampleValue,org.springframework.context.annotation.Bean,org.codehaus.jackson.annotate.JsonProperty,javax.persistence.Basic,org.codehaus.jackson.map.annotate.JsonSerialize,com.trgr.cobalt.infrastructure.spring.validation.Required,com.trgr.cobalt.dataroom.datasource.config.core.CoreTransactionNever,org.springframework.context.annotation.Profile,com.trgr.cobalt.infrastructure.spring.stereotype.Persistor,javax.persistence.Transient,com.trgr.cobalt.infrastructure.spring.validation.NotNull,javax.validation.constraints.Size,javax.persistence.Entity,javax.persistence.PrimaryKeyJoinColumn,org.hibernate.annotations.BatchSize,org.springframework.stereotype.Service,org.springframework.beans.factory.annotation.Value,javax.persistence.Inheritance [javac] error: warnings found and -Werror specified TIA!

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• Negating a set of words via java regex!

  - by jadaaih

  Hi folks, I would like to negate a set of words using java regex. Say, I want to negate cvs, svn, nvs, mvc. I wrote a regex which is ^[(svn|cvs|nvs|mvc)]. Some how that seems not to be working. Could you please help? Thanks. .\J

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• Java HashSet key/value pair

  - by harley

  Why does Java not provide functions to get at the key/value pairs in a HashSet like in Hashtable? It seems like a real pain to have to iterate over it every time you need to get at something. Or am I just a newb missing something?

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• Java Test by IKM

  - by Suresh S

  guys let me know whether the IKM test is harder compared to sun certifications.Anybody taken the test for java/j2ee let me know your experiences?what types of questions they ask.

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• ASP.NET client to stateful java webservice client (metro)

  - by hubertg

  Hi I have a webservice with the following annotations: @WebService @HttpSessionScope @Stateful @Addressing Now I created a ASP.NET (c#) client for this webservice, but when I call a method the following error is returned: This is a stateful web service and {http://jax-ws.dev.java.net/xml/ns/}objectId header is required. How can I tell ASP.net to switch to stateful mode? Is this possible at all? Thanks any advice/examples.

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• Java Substance look and feel problem

  - by 2xMax

  I have a problem with substance look and feel. I'm trying to set Office 2007 LAF as descibed here. try { UIManager.setLookAndFeel("org.pushingpixels.substance.api.skin.SubstanceOfficeBlue2007LookAndFeel"); }catch(Exception ex) { System.out.println("Exception:"+ ex.getMessage()); } But when i run this code I get exception: Exception in thread "main" java.lang.NoClassDefFoundError: org/pushingpixels/trident/ease/TimelineEase What am I doing wrong? Anybody have experience with substance LAF?

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• C# vs Java Concurrency

  - by Lirik

  What are some notable differences between C# and Java concurrency? Are there any fundamental differences that we should know about? What should developers consider when trying to pick one or the other? I based my question on this one, but I'm more interested in the fundamental differences... not which one is better.

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• Getting information of a class structure at runtime using Java reflection

  - by Eliza Sahoo

  A simple way to get the class structure information of the Class we are using in our application. Step1: Create the Class object of the class we want to explore at run time or the class which is getting added at runtime. Step2: As we are looking for the structure of the class, get all Constructors, Fields and methods by invoking respective functions of the Class. Step3: print them in java console or use them as required. Eliza

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• java socket send & receive byte array

  - by quan

  in server, I have send a byte array to client through java socket byte[] message = ... ; DataOutputStream dout = new DataOutputStream(client.getOutputStream()); dout.write(message); How can I receive this byte array from client? anyone give me some code example to do this thanks in advance

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• Use packages from plain old Java project in eclipse plugin project

  - by Joscha

  I have the following setup: eclipse a standard Java project (A) an eclipse plugin project (B) How (if possible) can I use packages from A within B without first compiling a JAR file from A and adding it to B? Thanks!

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• Java RMI method synchronization

  - by James Moore

  Hello, I have a class that is stored on the 'server' and multiple clients can call this method. This method returns a class. Now when clients call accessor methods within this class for example a set accessor method. I want the object on the server to be updated and synchronized across all the other clients. How do I use: public synchronized setStatus(String s) { this.status = s; } within java to achieve this. Thanks

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• BlueJ, NetBeans, Java

  - by Samuel

  Hey: I just started with Java and downloaded Netbeans, i kind of like it, but i hear a lot about BlueJ and i was wondering wether if downloading and using BlueJ would be of any use when im happy with Netbeans .. or simply tell me if i am comparing two things that aren't comparable and should coexist :D thanks, Samuel

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• Java CORBA Client Disconnects When Event Fires

  - by Benny

  I have built a Java CORBA application that subscribes to an event server. The application narrows and logs on just fine, but as soon as an event is sent to the client, it breaks with the error below. Please advise. 2010/04/25!13.00.00!E00555!enserver!EventServiceIF_i.cpp!655!PID(7390)!enserver - e._info=system exception, ID 'IDL:omg.org/CORBA/TRANSIENT:1.0' TAO exception, minor code = 54410093 (invocation connect failed; ECONNRESET), completed = NO

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