While playing around with Spring roo I see this error while running the integration tests via
perform tests
roo org.springframework.orm.jpa.JpaOptimisticLockingFailureException: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction
The problem was here, that my database table which stored the specific entities had a version column but only NULL values inside. I have replaced the NULLs with an numeric value and then it worked.
I’m just playing around with Spring Roo and multi-module Maven projects. When I start to import a project into the STS I am getting the following error and the SDK is getting unresponsive:
“Updating Maven Project”. Unsupported IClasspathEntry kind=4
The problem is somehow related to the m2e plugin integrated in the STS.
So solve this select (right click) on the STS/Eclipse modules
Maven -> Disable Maven Nature
Maven Disable Maven Nature in STS (Eclipse)
run in the terminal
mvn eclipse:clean
and select again in STS
Configure -> Convert to Maven Project
I’ve just searched for a way to reset the Java Formatting Options in Netbeans 7.1.1. And I didn’t find a convenient way to do this. The only way I found was to directly delete the .xml file (org-netbeans-modules-editor-settings-CustomPreferences.xml) which is responsible for storing the Java settings:
USER_DIR/.netbeans/7.1/config/Editors/text/x-java/Preferences
If you want to make your Java code more stylish (because you are using maybe the Maven Checkstyle Plugin) or more valid against conventions, you will stumble across the order of modifiers.
The new version of the nice Java Parallel Processing Framework (JPPF) is out. See what’s new in the release 3.0 by reading the release notes.
Neo4j is a graph database, storing data in the nodes and relationships of a graph. The most generic of data structures, a graph elegantly represents any kind of data, preserving the natural structure of the domain.
I am just working with Glassfish 3.2 and wanted to integrate log4j logging, so I can see Logger outputs in my normal server.log
-Dlog4j.configuration=file:///${com.sun.aas.instanceRoot}/config/log4j.propertiesWhat a pity. I really liked the Ruby support in Netbeans.
After thorough consideration, we have taken the difficult step to discontinue support for Ruby on Rails in the NetBeans IDE. Two main issues underpin this decision:
Java SE 7 and Java Development Kit 7 (JDK 7) are the next major releases of the Java SE platform, which Oracle is committed to deliver in 2011. A key objective of the NetBeans IDE has always been to offer superior support for the Java platform. To maintain that objective and capitalize on the JDK 7 release themes–multi-language support, developer productivity and performance–it is necessary that our engineering resources are committed to a timely and quality release of NetBeans IDE 7.0.
(via netbeans.org)
I just wanted to compile & assemble a Maven project using mvn assembly:assembly and got the following error:
Compilation failure [...](use -source 5 or higher to enable annotations)
To fix this error I needed to add
<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>2.3.2</version> <configuration> <source>1.6</source> <target>1.6</target> </configuration> </plugin>
to my pom.xml file.
Sometimes installing Java can be as if someone stabs you hundreds of pencils in the ass. I had trouble to install the Sun Java6 JDK after updating to Ubuntu 10.04.
I just had the problem that i wanted to change the project-type of an Eclipse project to ‘Java Project’ — it was a normal project before. This are the steps i executed:
<natures> and insert <nature>org.eclipse.jdt.core.javanature</nature> as a child.That’s it.
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apt-get install sun-java5-jdk
