-create new dynamic web project
-create new java class in some package
-use Refactor -> Move to move the class into default package

=>
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(String.java:1937)
at org.drools.eclipse.refactoring.RuleIFileMoveParticipant.getNewName(RuleIFileMoveParticipant.java:181)
at org.drools.eclipse.refactoring.RuleIFileMoveParticipant.initialize(RuleIFileMoveParticipant.java:118)
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.loadMoveParticipants(ParticipantManager.java:121)
...