### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core
Index: model/org/eclipse/jdt/core/JavaCore.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/core/JavaCore.java,v
retrieving revision 1.586
diff -u -r1.586 JavaCore.java
--- model/org/eclipse/jdt/core/JavaCore.java	11 Oct 2007 11:32:48 -0000	1.586
+++ model/org/eclipse/jdt/core/JavaCore.java	11 Oct 2007 14:25:07 -0000
@@ -82,7 +82,9 @@
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Hashtable;
+import java.util.List;
 import java.util.Map;
+import java.util.Vector;
 
 import org.eclipse.core.resources.IContainer;
 import org.eclipse.core.resources.IFile;
@@ -3373,6 +3375,7 @@
 			if (monitor != null)
 				monitor.subTask(Messages.javamodel_resetting_source_attachment_properties);
 			final IJavaProject[] projects = manager.getJavaModel().getJavaProjects();
+			List storedPaths = new Vector();
 			for (int i = 0, length = projects.length; i < length; i++) {
 				IClasspathEntry[] classpath;
 				try {
@@ -3384,8 +3387,13 @@
 				if (classpath != null) {
 					for (int j = 0, length2 = classpath.length; j < length2; j++) {
 						IClasspathEntry entry = classpath[j];
-						if (entry.getSourceAttachmentPath() != null)
-							Util.setSourceAttachmentProperty(entry.getPath(), null);
+						if (entry.getSourceAttachmentPath() != null) {
+							IPath aPath = entry.getPath();
+							if (! storedPaths.contains(aPath)) {
+								Util.setSourceAttachmentProperty(aPath, null);
+								storedPaths.add(aPath);
+							}
+						}
 						// else source might have been attached by IPackageFragmentRoot#attachSource(...), we keep it
 					}
 				}
@@ -3396,7 +3404,7 @@
 				monitor.subTask(Messages.javamodel_initializing_delta_state);
 			manager.deltaState.rootsAreStale = true; // in case it was already initialized before we cleaned up the source attachment proprties
 			manager.deltaState.initializeRoots(true/*initAfteLoad*/);
-
+			
 			// dummy query for waiting until the indexes are ready
 			if (monitor != null)
 				monitor.subTask(Messages.javamodel_configuring_searchengine);