Index: model/org/eclipse/jdt/internal/core/builder/IncrementalImageBuilder.java
===================================================================
RCS file: /home/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/builder/IncrementalImageBuilder.java,v
retrieving revision 1.87
diff -u -r1.87 IncrementalImageBuilder.java
--- model/org/eclipse/jdt/internal/core/builder/IncrementalImageBuilder.java	30 Mar 2006 16:24:29 -0000	1.87
+++ model/org/eclipse/jdt/internal/core/builder/IncrementalImageBuilder.java	1 May 2006 16:46:09 -0000
@@ -177,7 +177,8 @@
 	int index = CharOperation.lastIndexOf('/', secondaryTypeName);
 	String packageName = index == -1 ? null : new String(CharOperation.subarray(secondaryTypeName, 0, index));
 	StringSet packageNames = new StringSet(1);
-	packageNames.add(packageName);
+	if (packageName != null)
+		packageNames.add(packageName);
 	String typeName = new String(index == -1 ? secondaryTypeName : CharOperation.subarray(secondaryTypeName, index + 1, secondaryTypeName.length));
 	StringSet typeNames = new StringSet(1);
 	typeNames.add(typeName);