### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core
Index: compiler/org/eclipse/jdt/internal/compiler/lookup/ParameterizedMethodBinding.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/lookup/ParameterizedMethodBinding.java,v
retrieving revision 1.28
diff -u -r1.28 ParameterizedMethodBinding.java
--- compiler/org/eclipse/jdt/internal/compiler/lookup/ParameterizedMethodBinding.java	8 Jan 2009 20:51:05 -0000	1.28
+++ compiler/org/eclipse/jdt/internal/compiler/lookup/ParameterizedMethodBinding.java	4 Feb 2010 10:39:59 -0000
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2009 IBM Corporation and others.
+ * Copyright (c) 2000, 2010 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -10,6 +10,9 @@
  *******************************************************************************/
 package org.eclipse.jdt.internal.compiler.lookup;
 
+import java.lang.ref.WeakReference;
+import java.util.Map;
+import java.util.WeakHashMap;
 import org.eclipse.jdt.internal.compiler.ast.Wildcard;
 
 /**
@@ -20,6 +23,7 @@
  */
 public class ParameterizedMethodBinding extends MethodBinding {
 
+	private static Map getClassMethodBindingCache; // https://bugs.eclipse.org/bugs/show_bug.cgi?id=300734
 	protected MethodBinding originalMethod;
 
 	/**
@@ -249,7 +253,17 @@
 	 * The type of x.getClass() is substituted from 'Class<? extends Object>' into: 'Class<? extends raw(X)>
 	 */
 	public static ParameterizedMethodBinding instantiateGetClass(TypeBinding receiverType, MethodBinding originalMethod, Scope scope) {
-		ParameterizedMethodBinding method = new ParameterizedMethodBinding();
+		ParameterizedMethodBinding method;
+		if (getClassMethodBindingCache != null) {
+			WeakReference w = (WeakReference) getClassMethodBindingCache.get(receiverType);
+			if (w != null) {
+				method = (ParameterizedMethodBinding) w.get();
+				if (method != null) {
+					return method;
+				}
+			}
+		}
+		method = new ParameterizedMethodBinding();
 		method.modifiers = originalMethod.modifiers;
 		method.selector = originalMethod.selector;
 		method.declaringClass = originalMethod.declaringClass;
@@ -268,6 +282,10 @@
 		if ((method.returnType.tagBits & TagBits.HasMissingType) != 0) {
 			method.tagBits |=  TagBits.HasMissingType;
 		}
+		if (getClassMethodBindingCache == null) {
+			getClassMethodBindingCache = new WeakHashMap();
+		}
+		getClassMethodBindingCache.put(receiverType, new WeakReference(method));  // method refers back to key
 		return method;
 	}
 
#P org.eclipse.jdt.core.tests.model
Index: src/org/eclipse/jdt/core/tests/dom/ASTConverterBugsTestJLS3.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom/ASTConverterBugsTestJLS3.java,v
retrieving revision 1.7
diff -u -r1.7 ASTConverterBugsTestJLS3.java
--- src/org/eclipse/jdt/core/tests/dom/ASTConverterBugsTestJLS3.java	27 Jun 2008 16:02:37 -0000	1.7
+++ src/org/eclipse/jdt/core/tests/dom/ASTConverterBugsTestJLS3.java	4 Feb 2010 10:40:13 -0000
@@ -18,6 +18,11 @@
 import org.eclipse.jdt.core.ICompilationUnit;
 import org.eclipse.jdt.core.JavaModelException;
 import org.eclipse.jdt.core.dom.AST;
+import org.eclipse.jdt.core.dom.CompilationUnit;
+import org.eclipse.jdt.core.dom.ExpressionStatement;
+import org.eclipse.jdt.core.dom.IMethodBinding;
+import org.eclipse.jdt.core.dom.MethodDeclaration;
+import org.eclipse.jdt.core.dom.MethodInvocation;
 
 /**
  * Test suite to verify that DOM/AST bugs are fixed.
@@ -1042,4 +1047,21 @@
 			"Syntax error on token \",\", < expected\n",
 			result);
 }
+// https://bugs.eclipse.org/bugs/show_bug.cgi?id=300734
+public void testBug300734() throws JavaModelException {
+	this.workingCopies = new ICompilationUnit[1];
+	this.workingCopies[0] = getWorkingCopy("/Converter15/src/Bug300734.java",
+			"public class Bug300734 {\n" +
+			"	public void foo(String x) {\n" +
+			"		x.getClass();\n" +
+			"       x.getClass();\n" +
+			"	}\n" +
+			"}"
+	);
+	CompilationUnit unit = (CompilationUnit) runConversion(this.workingCopies[0], true/*bindings*/, false/*no statement recovery*/, true/*bindings recovery*/);
+	MethodDeclaration methodDeclaration = (MethodDeclaration) getASTNode(unit, 0, 0);
+	IMethodBinding methodBinding1 = ((MethodInvocation) ((ExpressionStatement) methodDeclaration.getBody().statements().get(0)).getExpression()).resolveMethodBinding();
+	IMethodBinding methodBinding2 = ((MethodInvocation) ((ExpressionStatement) methodDeclaration.getBody().statements().get(1)).getExpression()).resolveMethodBinding();
+	assertTrue("Bindings differ", methodBinding1 == methodBinding2);
+}
 }