Version IDE4.0Beta1
I got the following exception within different 
actions (see stack traces)
each time when accessing the following java class 
from the projects tab:

public class QueryContent {
    class SeedItemsProp extends DataProp{
    }
}

where the class DataProp is defined as follows:

public class DataProp{
}

When trying to rename a method with refactoring:

Annotation: Exception occurred in Request 
Processor
java.lang.IllegalStateException: Class not found 
in index: 
de.rochade.rap.base.QueryContent.SeedItemsProp
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Me
tadataElement.createElement
(MetadataElement.java:1041)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Se
miPersistentElement.persistChildren
(SemiPersistentElement.java:868)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Ja
vaClassImpl.matchPersistent
(JavaClassImpl.java:457)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Se
miPersistentElement.setElementInfo
(SemiPersistentElement.java:94)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Re
sourceImpl.initChildren(ResourceImpl.java:281)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Re
sourceImpl.initChildren(ResourceImpl.java:258)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Me
tadataElement.initCheck(MetadataElement.java:129)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Se
miPersistentElement.checkUpToDate
(SemiPersistentElement.java:217)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Ja
vaClassImpl.getContents(JavaClassImpl.java:354)
	at 
org.netbeans.jmi.javamodel.JavaClass$Impl.getConte
nts(Unknown Source)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Su
bClassesCollection$It.addInnerClasses
(SubClassesCollection.java:119)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Su
bClassesCollection$It.hasNext
(SubClassesCollection.java:140)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Su
bClassesCollection.size
(SubClassesCollection.java:65)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Re
ferenceColWrapper.size
(ReferenceColWrapper.java:145)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Re
ferenceColWrapper.toArray
(ReferenceColWrapper.java:192)
	at java.util.LinkedList.addAll
(LinkedList.java:262)
	at java.util.LinkedList.addAll
(LinkedList.java:242)
	at 
org.netbeans.modules.refactoring.api.RenameRefacto
ring.addSubtypes(RenameRefactoring.java:808)
	at 
org.netbeans.modules.refactoring.api.RenameRefacto
ring.overriddenBy(RenameRefactoring.java:399)
	at 
org.netbeans.modules.refactoring.api.RenameRefacto
ring.preCheck(RenameRefactoring.java:81)
	at 
org.netbeans.modules.refactoring.api.ui.Parameters
Panel$7.run(ParametersPanel.java:404)
	at org.openide.util.Task.run
(Task.java:136)
	at 
org.openide.util.RequestProcessor$Task.run
(RequestProcessor.java:330)
[catch] at 
org.openide.util.RequestProcessor$Processor.run
(RequestProcessor.java:686)


When opening the java editor:

Annotation: Exception occurred in Request 
Processor
java.lang.IllegalStateException: Class not found 
in index: 
de.rochade.rap.base.QueryContent.SeedItemsProp
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Me
tadataElement.createElement
(MetadataElement.java:1041)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Se
miPersistentElement.createAnyElement
(SemiPersistentElement.java:559)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Se
miPersistentElement.processMembers
(SemiPersistentElement.java:445)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Se
miPersistentElement.processPersistent
(SemiPersistentElement.java:396)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Ja
vaClassImpl.matchPersistent
(JavaClassImpl.java:464)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Se
miPersistentElement.setElementInfo
(SemiPersistentElement.java:94)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Re
sourceImpl.initChildren(ResourceImpl.java:281)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Re
sourceImpl.initChildren(ResourceImpl.java:258)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Me
tadataElement.initCheck(MetadataElement.java:129)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Se
miPersistentElement.getElementInfo
(SemiPersistentElement.java:144)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Se
miPersistentElement.getInternalForm
(SemiPersistentElement.java:746)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Me
tadataElement.getASTree(MetadataElement.java:435)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Me
tadataElement.getPosition
(MetadataElement.java:441)
	at 
org.netbeans.modules.javacore.jmiimpl.javamodel.Fe
atureImpl.getPosition(FeatureImpl.java:279)
	at 
org.netbeans.modules.javacore.JMManager.getElement
Position(JMManager.java:639)
	at 
org.netbeans.modules.java.JavaEditor$JavaEditorCom
ponent.findElement(JavaEditor.java:1268)
	at 
org.netbeans.modules.java.JavaEditor$JavaEditorCom
ponent.createNode(JavaEditor.java:1221)
	at 
org.netbeans.modules.java.JavaEditor$JavaEditorCom
ponent.access$800(JavaEditor.java:1147)
	at 
org.netbeans.modules.java.JavaEditor$12.run
(JavaEditor.java:1199)
	at org.openide.util.Mutex.readAccess
(Mutex.java:234)
	at 
org.netbeans.modules.java.JavaEditor$11.run
(JavaEditor.java:1197)
	at org.openide.util.Task.run
(Task.java:136)
	at 
org.openide.util.RequestProcessor$Task.run
(RequestProcessor.java:330)
[catch] at 
org.openide.util.RequestProcessor$Processor.run
(RequestProcessor.java:686)