### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core
Index: compiler/org/eclipse/jdt/internal/compiler/lookup/LookupEnvironment.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/lookup/LookupEnvironment.java,v
retrieving revision 1.105
diff -u -r1.105 LookupEnvironment.java
--- compiler/org/eclipse/jdt/internal/compiler/lookup/LookupEnvironment.java	9 Feb 2010 05:14:15 -0000	1.105
+++ compiler/org/eclipse/jdt/internal/compiler/lookup/LookupEnvironment.java	7 May 2010 13:06:45 -0000
@@ -905,6 +905,9 @@
 	// cached info is array of already created wildcard  types for this type
 	if (genericType == null) // pseudo wildcard denoting composite bounds for lub computation
 		genericType = ReferenceBinding.LUB_GENERIC;
+	// https://bugs.eclipse.org/bugs/show_bug.cgi?id=157847 don't allow '? super <null>' or '? extends <null>'
+	if (bound == null && boundKind != Wildcard.UNBOUND)
+		return null;
 	WildcardBinding[] cachedInfo = (WildcardBinding[])this.uniqueWildcardBindings.get(genericType);
 	boolean needToGrow = false;
 	int index = 0;
#P org.eclipse.jdt.core.tests.model
Index: src/org/eclipse/jdt/core/tests/dom/ASTModelBridgeTests.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom/ASTModelBridgeTests.java,v
retrieving revision 1.63
diff -u -r1.63 ASTModelBridgeTests.java
--- src/org/eclipse/jdt/core/tests/dom/ASTModelBridgeTests.java	14 Dec 2009 18:46:07 -0000	1.63
+++ src/org/eclipse/jdt/core/tests/dom/ASTModelBridgeTests.java	7 May 2010 13:06:50 -0000
@@ -2133,5 +2133,65 @@
 			element
 		);
 	}
+	/**
+	 * Ensures that we don't create internally inconsistent wildcard
+	 * bindings of the form '? extends <null>' or '? super <null>'
+	 * @see "https://bugs.eclipse.org/bugs/show_bug.cgi?id=157847" 
+	 */
+	public void testWildcard2() throws CoreException {
+		String filePath = "/P/src/Bug157847.java";
+		try {
+			String contents =
+				"public class Bug157847<T> {\n" +
+				"	void add(Y<? super T> l) {}\n" +
+				"}\n"+
+                "interface Y<T> {}\n";
+			createFile(filePath, contents);
+
+			BindingRequestor requestor = new BindingRequestor();
+			String[] bindingKeys = new String[] {"LBug157847~Y<LBug157847~Y;{0}-!LBug157847;{0}*54;>;"};
+			resolveASTs(
+				new ICompilationUnit[] {},
+				bindingKeys,
+				requestor,
+				getJavaProject("P"),
+				this.workingCopy.getOwner()
+			);
+			IBinding[] bindings = requestor.getBindings(bindingKeys);
+			assertTrue("Constructed bogus wildcard", bindings.length == 0);
+		} finally {
+			deleteFile(filePath);
+		}
+	}
+	/**
+	 * Ensures that we don't create internally inconsistent wildcard
+	 * bindings of the form '? extends <null>' or '? super <null>'
+	 * @see "https://bugs.eclipse.org/bugs/show_bug.cgi?id=157847" 
+	 */
+	public void testWildcard3() throws CoreException {
+		String filePath = "/P/src/Bug157847B.java";
+		try {
+			String contents =
+				"public class Bug157847B<T> {\n" +
+				"	void add(Y<? extends T> l) {}\n" +
+				"}\n"+
+                "interface Y<T> {}\n";
+			createFile(filePath, contents);
+
+			BindingRequestor requestor = new BindingRequestor();
+			String[] bindingKeys = new String[] {"LBug157847B~Y<LBug157847B~Y;{0}+!LBug157847B;{0}*54;>;"};
+			resolveASTs(
+				new ICompilationUnit[] {},
+				bindingKeys,
+				requestor,
+				getJavaProject("P"),
+				this.workingCopy.getOwner()
+			);
+			IBinding[] bindings = requestor.getBindings(bindingKeys);
+			assertTrue("Constructed bogus wildcard", bindings.length == 0);
+		} finally {
+			deleteFile(filePath);
+		}
+	}
 
 }