wlu: override hashCode method

org.eclipse.epf.uma.ecore/src/org/eclipse/epf/uma/ecore/ResolveException.java

diff --git a/org.eclipse.epf.uma.ecore/src/org/eclipse/epf/uma/ecore/ResolveException.java b/org.eclipse.epf.uma.ecore/src/org/eclipse/epf/uma/ecore/ResolveException.java
index 71ac72b..a0e082c 100644
--- a/org.eclipse.epf.uma.ecore/src/org/eclipse/epf/uma/ecore/ResolveException.java
+++ b/org.eclipse.epf.uma.ecore/src/org/eclipse/epf/uma/ecore/ResolveException.java
@@ -98,5 +98,17 @@
 		}
 		return super.equals(obj);
 	}
-
+	
+	public int hashCode() {
+		if (proxy instanceof InternalEObject) {
+			int hc = resolver == null ? 0 : resolver.hashCode();
+			URI uri = ((InternalEObject) proxy).eProxyURI();
+			if (uri != null) {
+				return (Integer.toString(hc) + uri).hashCode();
+			}
+			return hc;
+		}
+		return super.hashCode();
+	}
+	
 }