Test case:
1. Start JBDS
2. Create 'test' Java project
3. Create 'test' Java package
4. Create 'Test' Java class in 'test' package
5. Create 'int user' field
6. Select field and right-click on it
7. Select menu Source->Generate Getters and Setters then press OK button
8. Select field and right-click on it
9. Select menu Refactor->Rename then type user2 and press Ctrl+Enter
10. See Error log

FAIL:

java.lang.ClassCastException: org.eclipse.jdt.internal.core.SourceField cannot be cast to org.eclipse.jdt.core.IMethod
at com.google.gwt.eclipse.core.refactoring.GWTRenameParticipant.initialize(GWTRenameParticipant.java:115)
at com.google.gwt.eclipse.core.refactoring.GWTRenameMemberParticipant.initialize(GWTRenameMemberParticipant.java:38)
at com.google.gwt.eclipse.core.refactoring.rpc.PairedMethodRenameParticipant.initialize(PairedMethodRenameParticipant.java:224)
at org.eclipse.ltk.core.refactoring.participants.RefactoringParticipant.initialize(RefactoringParticipant.java:105)
at org.eclipse.ltk.core.refactoring.participants.ParticipantExtensionPoint.getParticipants(ParticipantExtensionPoint.java:100)
at org.eclipse.ltk.core.refactoring.participants.ParticipantManager.loadRenameParticipants(ParticipantManager.java:74)
at org.eclipse.jdt.internal.corext.refactoring.rename.RenameModifications.loadParticipants(RenameModifications.java:190)
at org.eclipse.jdt.internal.corext.refactoring.rename.JavaRenameProcessor.loadParticipants(JavaRenameProcessor.java:40)
at org.eclipse.ltk.core.refactoring.participants.ProcessorBasedRefactoring.checkFinalConditions(ProcessorBasedRefactoring.java:233)
at org.eclipse.ltk.core.refactoring.CheckConditionsOperation.run(CheckConditionsOperation.java:85)
at org.eclipse.ltk.core.refactoring.CreateChangeOperation.run(CreateChangeOperation.java:121)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1975)
at org.eclipse.ltk.internal.ui.refactoring.WorkbenchRunnableAdapter.run(WorkbenchRunnableAdapter.java:87)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)

java.lang.ClassCastException: org.eclipse.jdt.internal.core.SourceField cannot be cast to org.eclipse.jdt.core.IMethod
at com.google.gwt.eclipse.core.refactoring.GWTRenameParticipant.initialize(GWTRenameParticipant.java:115)
at com.google.gwt.eclipse.core.refactoring.GWTRenameMemberParticipant.initialize(GWTRenameMemberParticipant.java:38)
at org.eclipse.ltk.core.refactoring.participants.RefactoringParticipant.initialize(RefactoringParticipant.java:105)
at org.eclipse.ltk.core.refactoring.participants.ParticipantExtensionPoint.getParticipants(ParticipantExtensionPoint.java:100)
at org.eclipse.ltk.core.refactoring.participants.ParticipantManager.loadRenameParticipants(ParticipantManager.java:74)
at org.eclipse.jdt.internal.corext.refactoring.rename.RenameModifications.loadParticipants(RenameModifications.java:190)
at org.eclipse.jdt.internal.corext.refactoring.rename.JavaRenameProcessor.loadParticipants(JavaRenameProcessor.java:40)
at org.eclipse.ltk.core.refactoring.participants.ProcessorBasedRefactoring.checkFinalConditions(ProcessorBasedRefactoring.java:233)
at org.eclipse.ltk.core.refactoring.CheckConditionsOperation.run(CheckConditionsOperation.java:85)
at org.eclipse.ltk.core.refactoring.CreateChangeOperation.run(CreateChangeOperation.java:121)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1975)
at org.eclipse.ltk.internal.ui.refactoring.WorkbenchRunnableAdapter.run(WorkbenchRunnableAdapter.java:87)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)