### Eclipse Workspace Patch 1.0
#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 1.442
diff -u -r1.442 JavaModelManager.java
--- model/org/eclipse/jdt/internal/core/JavaModelManager.java	10 Dec 2009 18:45:24 -0000	1.442
+++ model/org/eclipse/jdt/internal/core/JavaModelManager.java	15 Feb 2010 16:30:39 -0000
@@ -4323,6 +4323,8 @@
 					ICompilationUnit unit = JavaModelManager.createCompilationUnitFrom(file, null);
 					IType type = unit.getType(typeName);
 					types.put(typeName, type); // replace stored path with type itself
+				} else {
+					types.remove(typeName);
 				}
 			}
 		}
@@ -4828,6 +4830,20 @@
 	public void contentTypeChanged(ContentTypeChangeEvent event) {
 		Util.resetJavaLikeExtensions();
 
+		// Walk through projects to reset their secondary types cache
+		IJavaProject[] projects;
+		try {
+			projects = JavaModelManager.getJavaModelManager().getJavaModel().getJavaProjects();
+		} catch (JavaModelException e) {
+			return;
+		}
+		for (int i = 0, length = projects.length; i < length; i++) {
+			IJavaProject project = projects[i];
+			final PerProjectInfo projectInfo = getPerProjectInfo(project.getProject(), false /* don't create info */);
+			if (projectInfo != null) {
+				projectInfo.secondaryTypes = null;
+			}
+		}
 	}
 
 	public synchronized String cacheToString(String prefix) {
Index: model/org/eclipse/jdt/internal/core/NameLookup.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/NameLookup.java,v
retrieving revision 1.126
diff -u -r1.126 NameLookup.java
--- model/org/eclipse/jdt/internal/core/NameLookup.java	20 Apr 2009 20:40:14 -0000	1.126
+++ model/org/eclipse/jdt/internal/core/NameLookup.java	15 Feb 2010 16:30:39 -0000
@@ -583,12 +583,6 @@
 	 * Find secondary type for a project.
 	 */
 	private IType findSecondaryType(String packageName, String typeName, IJavaProject project, boolean waitForIndexes, IProgressMonitor monitor) {
-		if (JavaModelManager.VERBOSE) {
-			Util.verbose("NameLookup FIND SECONDARY TYPES:"); //$NON-NLS-1$
-			Util.verbose(" -> pkg name: " + packageName);  //$NON-NLS-1$
-			Util.verbose(" -> type name: " + typeName);  //$NON-NLS-1$
-			Util.verbose(" -> project: "+project.getElementName()); //$NON-NLS-1$
-		}
 		JavaModelManager manager = JavaModelManager.getJavaModelManager();
 		try {
 			IJavaProject javaProject = project;
@@ -599,6 +593,10 @@
 					IType type = (IType) types.get(typeName);
 					if (type != null) {
 						if (JavaModelManager.VERBOSE) {
+							Util.verbose("NameLookup FIND SECONDARY TYPES:"); //$NON-NLS-1$
+							Util.verbose(" -> pkg name: " + packageName);  //$NON-NLS-1$
+							Util.verbose(" -> type name: " + typeName);  //$NON-NLS-1$
+							Util.verbose(" -> project: "+project.getElementName()); //$NON-NLS-1$
 							Util.verbose(" -> type: " + type.getElementName());  //$NON-NLS-1$
 						}
 						return type;
#P org.eclipse.jdt.core.tests.model
Index: src/org/eclipse/jdt/core/tests/model/ClassNameTests.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/model/ClassNameTests.java,v
retrieving revision 1.18
diff -u -r1.18 ClassNameTests.java
--- src/org/eclipse/jdt/core/tests/model/ClassNameTests.java	27 Jun 2008 16:02:40 -0000	1.18
+++ src/org/eclipse/jdt/core/tests/model/ClassNameTests.java	15 Feb 2010 16:30:41 -0000
@@ -16,6 +16,8 @@
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.NullProgressMonitor;
+import org.eclipse.core.runtime.Platform;
+import org.eclipse.core.runtime.content.IContentType;
 import org.eclipse.jdt.core.IClasspathEntry;
 import org.eclipse.jdt.core.ICompilationUnit;
 import org.eclipse.jdt.core.IJavaProject;
@@ -1244,4 +1246,48 @@
 		deleteProject("P");
 	}
 }
+
+/**
+ * @bug 302455: java.lang.ClassCastException in secondary types removal
+ * @test Ensure that no invalid entries are put in the secondary types caches
+ * 		when a file extension spec is removed from the workspace as the CCE
+ * 		does no longer occur...
+ * 		Also verify that secondary types from the removed file extension are not
+ * 		kept in the projects caches as the secondary type is no longer in the
+ * 		cache at the end of the test...
+ * @see "https://bugs.eclipse.org/bugs/show_bug.cgi?id=302455"
+ */
+public void testBug302455() throws CoreException, InterruptedException {
+	IContentType javaContentType = Platform.getContentTypeManager().getContentType(JavaCore.JAVA_SOURCE_CONTENT_TYPE);
+	try {
+		// Create project and file
+		assertNotNull("We should have got a Java Source content type!", javaContentType);
+		javaContentType.addFileSpec("b302455", IContentType.FILE_EXTENSION_SPEC);
+		IJavaProject javaProject = createJavaProject("P");
+		createFolder("/P/p");			
+		String filePath = "/P/p/Bug.b302455";
+		createFile(
+			filePath,
+			"package p;\n" +
+			"public class Bug {}\n" +
+			"class Secondary {}\n" +
+			""
+		);
+		waitUntilIndexesReady();
+		
+		// Get the secondary type
+		IType type = javaProject.findType("p.Secondary", new NullProgressMonitor());
+		assertNotNull("We should have found the secondary type!", type);
+		
+		// Remove file extension
+		org.eclipse.jdt.internal.core.JavaModelManager.VERBOSE = true;
+		javaContentType.removeFileSpec("b302455", IContentType.FILE_EXTENSION_SPEC);
+		
+		// As there's no specific event fo
+		type = javaProject.findType("p.Secondary", new NullProgressMonitor());
+		assertNull("We should have not found the secondary type!", type);
+	} finally {
+		deleteProject("P");
+	}
+}
 }