Index: model/org/eclipse/jdt/internal/core/NameLookup.java
===================================================================
RCS file: /home/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/NameLookup.java,v
retrieving revision 1.84
diff -u -r1.84 NameLookup.java
--- model/org/eclipse/jdt/internal/core/NameLookup.java	17 Mar 2005 09:02:55 -0000	1.84
+++ model/org/eclipse/jdt/internal/core/NameLookup.java	30 Mar 2005 21:32:40 -0000
@@ -176,13 +176,23 @@
 					this.packageFragments.put(pkgName, root);
 				} else {
 					if (existing instanceof PackageFragmentRoot) {
-						this.packageFragments.put(pkgName, new IPackageFragmentRoot[] {(PackageFragmentRoot) existing, root});
+						if (!existing.equals(root))
+							this.packageFragments.put(pkgName, new IPackageFragmentRoot[] {(PackageFragmentRoot) existing, root});
 					} else {
 						IPackageFragmentRoot[] roots = (IPackageFragmentRoot[]) existing;
 						int rootLength = roots.length;
-						System.arraycopy(roots, 0, roots = new IPackageFragmentRoot[rootLength+1], 0, rootLength);
-						roots[rootLength] = root;
-						this.packageFragments.put(pkgName, roots);
+						boolean containsRoot = false;
+						for (int j = 0; j < rootLength; j++) {
+							if (roots[j].equals(root)) {
+								containsRoot = true;
+								break;
+							}
+						}
+						if (containsRoot) {
+							System.arraycopy(roots, 0, roots = new IPackageFragmentRoot[rootLength+1], 0, rootLength);
+							roots[rootLength] = root;
+							this.packageFragments.put(pkgName, roots);
+						}
 					}
 				}
 				visited.add(root);