### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core
Index: model/org/eclipse/jdt/internal/core/hierarchy/TypeHierarchy.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/hierarchy/TypeHierarchy.java,v
retrieving revision 1.110
diff -u -r1.110 TypeHierarchy.java
--- model/org/eclipse/jdt/internal/core/hierarchy/TypeHierarchy.java	6 Jul 2010 08:42:07 -0000	1.110
+++ model/org/eclipse/jdt/internal/core/hierarchy/TypeHierarchy.java	10 Nov 2010 07:45:37 -0000
@@ -197,6 +197,7 @@
  * Adds the type to the collection of interfaces.
  */
 protected void addInterface(IType type) {
+	if (this.interfaces.contains(type)) return;
 	this.interfaces.add(type);
 }
 /**
#P org.eclipse.jdt.core.tests.model
Index: src/org/eclipse/jdt/core/tests/model/TypeHierarchyTests.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/model/TypeHierarchyTests.java,v
retrieving revision 1.97
diff -u -r1.97 TypeHierarchyTests.java
--- src/org/eclipse/jdt/core/tests/model/TypeHierarchyTests.java	11 May 2010 18:58:15 -0000	1.97
+++ src/org/eclipse/jdt/core/tests/model/TypeHierarchyTests.java	10 Nov 2010 07:45:40 -0000
@@ -35,7 +35,7 @@
 	ITypeHierarchy typeHierarchy;
 
 static {
-//	TESTS_NAMES= new String[] { "testGeneric7" };
+//	TESTS_NAMES= new String[] { "testBug329663a" };
 }
 public static Test suite() {
 	return buildModelTestSuite(TypeHierarchyTests.class);
@@ -2421,4 +2421,84 @@
 		"  <anonymous #1> [in testIt() [in BugTest2Buggy [in BugTest2Buggy.java [in p288698 [in src288698.classbug [in TypeHierarchy]]]]]]\n",
 		hierarchy);
 }
+public void testBug329663() throws JavaModelException, CoreException {
+		try {
+			IJavaProject p1 = createJavaProject("P1", new String[] {""}, new String[] {"JCL_LIB"}, new String[0], "");
+			IJavaProject p2 = createJavaProject("P2", new String[] {""}, new String[] {"JCL_LIB"}, new String[] {"/P1"}, "");
+			createFolder("/P1/p");
+			createFile(
+					"/P1/p/I.java",
+					"package p;\n" +
+					"public interface I{}");
+			createFile(
+					"/P1/p/X.java",
+					"package p;\n" +
+					"public class X implements I{\n" +
+					"}"
+			);
+			createFolder("/P2/q");
+			createFile(
+					"/P2/q/Y.java",
+					"package q;\n" +
+					"import p.*;\n" +
+					"public class Y implements I {\n" +
+						"}"
+			);
+			IRegion region = JavaCore.newRegion();
+			region.add(p1);
+			region.add(p2);
+			ITypeHierarchy hierarchy = JavaCore.newTypeHierarchy(region, null, null);
+			IType[] types = hierarchy.getRootInterfaces();
+			assertTypesEqual("Unexpected super interfaces", 
+					"java.io.Serializable\n" + 
+					"p.I\n", 
+					types);
+		}
+		finally{
+			deleteProject("P1");
+			deleteProject("P2");
+		}
+}
+public void testBug329663a() throws JavaModelException, CoreException {
+	try {
+		IJavaProject p1 = createJavaProject("P1", new String[] {""}, new String[] {"JCL_LIB"}, new String[0], "");
+		IJavaProject p2 = createJavaProject("P2", new String[] {""}, new String[] {"JCL_LIB"}, new String[] {"/P1"}, "");
+		createFolder("/P1/p");
+		createFile(
+				"/P1/p/I.java",
+				"package p;\n" +
+				"public interface I{}");
+		createFile(
+				"/P1/p/X.java",
+				"package p;\n" +
+				"public class X implements I{\n" +
+					"}"
+		);
+		createFolder("/P2/q");
+		createFile(
+				"/P2/q/I.java",
+				"package q;\n" +
+				"public interface I{}");
+		createFile(
+				"/P2/q/Y.java",
+				"package q;\n" +
+				"public class Y implements I {\n" +
+					"}"
+		);
+		IRegion region = JavaCore.newRegion();
+		region.add(p1);
+		region.add(p2);
+		ITypeHierarchy hierarchy = JavaCore.newTypeHierarchy(region, null, null);
+		IType[] types = hierarchy.getRootInterfaces();
+		assertTypesEqual("Unexpected super interfaces", 
+				"java.io.Serializable\n" + 
+				"p.I\n" + 
+				"q.I\n", 
+				types);
+	}
+	finally{
+		deleteProject("P1");
+		deleteProject("P2");
+	}
 }
+}
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