NullPointerException with Eclipse 3.8

edited July 2012 in Other

after installing, I get the following error when I try to create a class diagram.

I use UML Lab Modeling IDE with the new Eclipse 3.8


!ENTRY com.yattasolutions.umllab 4 0 2012-07-27 10:28:23.694
!MESSAGE UML Lab internal error: Unexpected Exception (org.eclipse.core.commands.ExecutionException: While executing the operation, an exception occurred)
org.eclipse.core.commands.ExecutionException: While executing the operation, an exception occurred
at org.eclipse.core.commands.operations.DefaultOperationHistory.execute(
at com.yattasolutions.obf.ld.x.c(SourceFile:842)
at com.yattasolutions.obf.ld.x.a(SourceFile:809)
at com.yattasolutions.obf.ld.x.b(SourceFile:709)
at com.yattasolutions.obf.ld.x.a(SourceFile:628)
at com.yattasolutions.obf.ld.z.a(SourceFile:171)
at com.yattasolutions.obf.ld.z$
Caused by: java.lang.NullPointerException
at com.yattasolutions.obf.aa.a.cq(SourceFile:236)
at com.yattasolutions.obf.aa.a.cC(SourceFile:611)
at com.yattasolutions.obf.ld.u.execute(SourceFile:212)
at com.yattasolutions.obf.ld.x.b(SourceFile:834)
at com.yattasolutions.obf.ld.x$
at com.yattasolutions.obf.ld.x.a(SourceFile:800)
at com.yattasolutions.obf.ld.x.b(SourceFile:709)
at com.yattasolutions.obf.ld.x.a(SourceFile:628)
at com.yattasolutions.obf.y.a.a(SourceFile:35)
at com.yattasolutions.obf.h.a.a(SourceFile:404)
at com.yattasolutions.obf.h.a.a(SourceFile:390)
at com.yattasolutions.obf.aa.g.doExecute(SourceFile:122)
at com.yattasolutions.obf.ld.u.execute(SourceFile:212)
at org.eclipse.core.commands.operations.DefaultOperationHistory.execute(
... 7 more


  • Hello Michael,

    I created a ticket for your issue ( We'll try reproducing the bug and get back to you as soon as possible.

  • Hi Michael,

    installing UML Lab into a freshly extracted Eclipse 3.8 and creating class diagrams afterwards worked fine for me.

    The stacktrace indicates that the plug-in "com.yattasolutions.codegen.reverse.oaw" is not available. Could you please check the installation details if the plug-in is available? See "Help->About->Installation Details->Plug-Ins".

    Additionally, could you please check your error log for problems starting plug-ins? If it's fine with you, you can also send me your .log file. It is located in the workspace's .metadata directory.

    As a workaround you can also download the UML Lab RCP, which is available here:

    Best regards
Sign In or Register to comment.