### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core.tests.builder
Index: src/org/eclipse/jdt/core/tests/builder/BasicBuildTests.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.builder/src/org/eclipse/jdt/core/tests/builder/BasicBuildTests.java,v
retrieving revision 1.21
diff -u -r1.21 BasicBuildTests.java
--- src/org/eclipse/jdt/core/tests/builder/BasicBuildTests.java	29 Mar 2006 03:16:23 -0000	1.21
+++ src/org/eclipse/jdt/core/tests/builder/BasicBuildTests.java	20 Nov 2006 11:42:33 -0000
@@ -19,6 +19,7 @@
 import org.eclipse.core.resources.IMarker;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IPath;
+import org.eclipse.jdt.core.IJavaProject;
 import org.eclipse.jdt.core.JavaCore;
 import org.eclipse.jdt.core.JavaModelException;
 import org.eclipse.jdt.core.tests.util.Util;
@@ -402,4 +403,18 @@
 		fullBuild(projectPath);
 		expectingNoProblems();
 	}
+
+	/**
+	 * @bug 164707: ArrayIndexOutOfBoundsException in JavaModelManager if source level == 6.0
+	 * @test Ensure that AIIOB does not longer happen with invalid source level string
+	 * @see "https://bugs.eclipse.org/bugs/show_bug.cgi?id=164707"
+	 */
+	public void testBug164707() throws JavaModelException {
+		IPath projectPath = env.addProject("Project"); //$NON-NLS-1$
+		IJavaProject javaProject = env.getJavaProject(projectPath); 
+		javaProject.setOption(JavaCore.COMPILER_SOURCE, "invalid");
+		env.addExternalJars(projectPath, Util.getJavaClassLibs());
+		fullBuild(projectPath);
+		expectingNoProblems();
+	}
 }
#P org.eclipse.jdt.core
Index: model/org/eclipse/jdt/internal/core/JavaModelManager.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/JavaModelManager.java,v
retrieving revision 1.344
diff -u -r1.344 JavaModelManager.java
--- model/org/eclipse/jdt/internal/core/JavaModelManager.java	6 Nov 2006 14:13:45 -0000	1.344
+++ model/org/eclipse/jdt/internal/core/JavaModelManager.java	20 Nov 2006 11:42:37 -0000
@@ -329,7 +329,15 @@
 		 */
 		private int indexForSourceLevel(String sourceLevel) {
 			if (sourceLevel == null) return 0;
-			return sourceLevel.charAt(2) - 49;
+			int index = sourceLevel.charAt(2) - 49;
+			if (index < 0 || index > 5) {
+				// avoid AIIOB when source level is malformed (see bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=164707)
+				if (VERBOSE) {
+					System.out.println(sourceLevel+" is not a valid compiler source level (1.1 -> 1.6 expected)"); //$NON-NLS-1$
+				}
+				return 0;
+			}
+			return index;
 		}
 		
 		private int sortParticipants(ArrayList group, IConfigurationElement[] configElements, int index) {