Index: model/org/eclipse/jdt/internal/core/builder/AbstractImageBuilder.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/builder/AbstractImageBuilder.java,v
retrieving revision 1.110
diff -u -r1.110 AbstractImageBuilder.java
--- model/org/eclipse/jdt/internal/core/builder/AbstractImageBuilder.java	19 Apr 2007 17:11:31 -0000	1.110
+++ model/org/eclipse/jdt/internal/core/builder/AbstractImageBuilder.java	4 May 2007 19:19:50 -0000
@@ -243,7 +243,10 @@
 							if (!isOutputFolder) {
 								if (folderPath == null)
 									folderPath = proxy.requestFullPath();
-								createFolder(folderPath.removeFirstSegments(segmentCount), outputFolder);
+								String packageName = folderPath.lastSegment();
+								// only create the package if its a valid package name
+								if (packageName.length() > 0 && packageName.indexOf('.') == -1)
+									createFolder(folderPath.removeFirstSegments(segmentCount), outputFolder);
 							}
 					}
 					return true;