Soft-Tech-Stuff: 2012-08

Friday, August 31, 2012

Hi all,

after a while I'm here again with a new, but short, post about an error that sometimes I find.

Software stack:

Maven 2;
JDK 6;
JPA 1.0;
EJB 3.0;

When building my maven project, which deals with JPA1 project module and EJB3.0 project module, compilation fails with this error message:

class file for javax.persistence.GenerationType not found

Here is the full "stack-trace":

[INFO] Building model
[INFO]    task-segment: [clean, install]
[INFO] ------------------------------------------------------------------------
[INFO] [clean:clean {execution: default-clean}]
[INFO] Deleting directory /home/foogaro/prj/jpa1-ejb3/core-api/target
[INFO] [resources:resources {execution: default-resources}]
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO] [compiler:compile {execution: default-compile}]
[INFO] Compiling 55 source files to /home/foogaro/prj/jpa1-ejb3/core-api/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] Failure executing javac, but could not parse the error:
An exception has occurred in the compiler (1.6.0_33). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport)  after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report.  Thank you.
com.sun.tools.javac.code.Symbol$CompletionFailure: class file for javax.persistence.GenerationType not found

[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Compilation failure
Failure executing javac, but could not parse the error:
An exception has occurred in the compiler (1.6.0_33). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport)  after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report.  Thank you.
com.sun.tools.javac.code.Symbol$CompletionFailure: class file for javax.persistence.GenerationType not found


[INFO] ------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.BuildFailureException: Compilation failure
Failure executing javac, but could not parse the error:
An exception has occurred in the compiler (1.6.0_33). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport)  after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report.  Thank you.
com.sun.tools.javac.code.Symbol$CompletionFailure: class file for javax.persistence.GenerationType not found


 at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:715)
 at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:556)
 at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:535)
 at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
 at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
 at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
 at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
 at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
 at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
 at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
 at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
 at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
 at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.plugin.CompilationFailureException: Compilation failure
Failure executing javac, but could not parse the error:
An exception has occurred in the compiler (1.6.0_33). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport)  after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report.  Thank you.
com.sun.tools.javac.code.Symbol$CompletionFailure: class file for javax.persistence.GenerationType not found


 at org.apache.maven.plugin.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:656)
 at org.apache.maven.plugin.CompilerMojo.execute(CompilerMojo.java:128)
 at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
 at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
 ... 17 more
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4 seconds
[INFO] Finished at: Fri Aug 31 10:38:41 CEST 2012
[INFO] Final Memory: 33M/338M
[INFO] ------------------------------------------------------------------------

The message is not clear at all and after digging into it, I discovered that I was missing a dependency: jpa 1.0.

So adding this to the pom.xml

        
            javax.persistence
            persistence-api
            1.0
            provided

compilation failure disappeared.

Hope it helps,
ciao,
Foogaro

class file for javax.persistence.GenerationType not found