NetBeans Apply Code Changes gives a FileNotFoundException
===

I'm building a Jenkins plugin and when I click Apply Code Changes, I get an error:


    Compiling 1 source file to otabuilder/target/classes
    
    [license:process]
    Generated otabuilder/target/otabuilder/WEB-INF/licenses.xml
    ------------------------------------------------------------------------
    BUILD SUCCESS
    ------------------------------------------------------------------------
    Total time: 13.647s
    Finished at: Tue Jul 24 13:47:54 CEST 2012
    Final Memory: 23M/81M
    ------------------------------------------------------------------------
    java.io.FileNotFoundException: otabuilder/target/classes/nl/patrician/OtaBuilder
    	at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FolderObj.getInputStream(FolderObj.java:619)
    	at org.openide.filesystems.FileObject.asBytes(FileObject.java:632)
    	at org.netbeans.modules.maven.debug.DebuggerChecker.reload(DebuggerChecker.java:230)
    	at org.netbeans.modules.maven.debug.DebuggerChecker.executionResult(DebuggerChecker.java:173)
    	at org.netbeans.modules.maven.execute.MavenCommandLineExecutor.run(MavenCommandLineExecutor.java:212)
    	at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:153)
    NetBeans: classes to reload: [nl.patrician.OtaBuilder]
    NetBeans:The bytes do not represent a valid class. class not in class file format

I am unsure of the deeper problem, since the directory seems to exist. However, `otabuilder/target/classes/nl/patrician/OtaBuilder` is a directory, although `otabuilder/target/classes/nl/patrician/OtaBuilder.class` also exists.