### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core.tests.performance
Index: src/org/eclipse/jdt/core/tests/performance/FullSourceWorkspaceModelTests.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.performance/src/org/eclipse/jdt/core/tests/performance/FullSourceWorkspaceModelTests.java,v
retrieving revision 1.23
diff -u -r1.23 FullSourceWorkspaceModelTests.java
--- src/org/eclipse/jdt/core/tests/performance/FullSourceWorkspaceModelTests.java	2 Apr 2007 07:28:54 -0000	1.23
+++ src/org/eclipse/jdt/core/tests/performance/FullSourceWorkspaceModelTests.java	18 Apr 2007 17:04:27 -0000
@@ -16,21 +16,47 @@
 import java.io.PrintStream;
 import java.util.ArrayList;
 
-import junit.framework.*;
+import junit.framework.Test;
 
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.IProjectDescription;
 import org.eclipse.core.resources.IWorkspace;
 import org.eclipse.core.resources.IWorkspaceRoot;
 import org.eclipse.core.resources.ResourcesPlugin;
-import org.eclipse.core.runtime.*;
-import org.eclipse.jdt.core.*;
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IPath;
+import org.eclipse.core.runtime.Path;
+import org.eclipse.jdt.core.IClasspathEntry;
+import org.eclipse.jdt.core.ICompilationUnit;
+import org.eclipse.jdt.core.IField;
+import org.eclipse.jdt.core.IInitializer;
+import org.eclipse.jdt.core.IJavaElement;
+import org.eclipse.jdt.core.IJavaModel;
+import org.eclipse.jdt.core.IJavaProject;
+import org.eclipse.jdt.core.IMethod;
+import org.eclipse.jdt.core.IPackageFragment;
+import org.eclipse.jdt.core.IProblemRequestor;
+import org.eclipse.jdt.core.IType;
+import org.eclipse.jdt.core.JavaCore;
+import org.eclipse.jdt.core.JavaModelException;
+import org.eclipse.jdt.core.WorkingCopyOwner;
 import org.eclipse.jdt.core.dom.AST;
 import org.eclipse.jdt.core.dom.CompilationUnit;
-import org.eclipse.jdt.core.search.*;
+import org.eclipse.jdt.core.search.IJavaSearchConstants;
+import org.eclipse.jdt.core.search.IJavaSearchScope;
+import org.eclipse.jdt.core.search.SearchEngine;
+import org.eclipse.jdt.core.search.SearchMatch;
+import org.eclipse.jdt.core.search.SearchPattern;
+import org.eclipse.jdt.core.search.SearchRequestor;
+import org.eclipse.jdt.core.search.TypeNameRequestor;
 import org.eclipse.jdt.core.tests.model.AbstractJavaModelTests;
 import org.eclipse.jdt.core.tests.model.AbstractJavaModelTests.ProblemRequestor;
-import org.eclipse.jdt.internal.core.*;
+import org.eclipse.jdt.internal.core.DefaultWorkingCopyOwner;
+import org.eclipse.jdt.internal.core.IJavaElementRequestor;
+import org.eclipse.jdt.internal.core.JavaElement;
+import org.eclipse.jdt.internal.core.JavaProject;
+import org.eclipse.jdt.internal.core.NameLookup;
 import org.eclipse.test.performance.Performance;
 
 /**
@@ -854,6 +880,68 @@
 	}
 }
 
+/*
+ * Creates a simple Java project with no source folder and only rt.jar on its classpath.
+ */
+private IJavaProject createJavaProject(String name) throws CoreException {
+	IProject project = ResourcesPlugin.getWorkspace().getRoot().getProject(name);
+	if (project.exists())
+		project.delete(true, null);
+	project.create(null);
+	project.open(null);
+	IProjectDescription description = project.getDescription();
+	description.setNatureIds(new String[] {JavaCore.NATURE_ID});
+	project.setDescription(description, null);
+	IJavaProject javaProject = JavaCore.create(project);
+	javaProject.setRawClasspath(new IClasspathEntry[] {JavaCore.newVariableEntry(new Path("JRE_LIB"), null, null)}, null);
+	return javaProject;
+
+}
+/*
+ * Performance test for the first use of findType(...)
+ * (see bug 161175 JarPackageFragmentRoot slow to initialize)
+ */
+public void testFindType() throws CoreException {
+	
+	// get 20 projects
+	IJavaModel model = JavaCore.create(ResourcesPlugin.getWorkspace().getRoot());
+	int max = 20;
+	IJavaProject[] projects = new IJavaProject[max];
+	for (int i = 0; i < max; i++) {
+		projects[i] = createJavaProject("FindType" + i);
+	}
+	AbstractJavaModelTests.waitUntilIndexesReady();
+	AbstractJavaModelTests.waitForAutoBuild();
+	
+	try {
+		// warm up
+		for (int i = 0; i < 5; i++) {
+			model.close();
+			for (int j = 0; j < max; j++) {
+				projects[j].findType("java.lang.Object");
+			}
+		}
+			
+		// measure performance
+		for (int i = 0; i < 10; i++) {
+			model.close();
+			runGc();
+			startMeasuring();
+			for (int j = 0; j < max; j++) {
+				projects[j].findType("java.lang.Object");
+			}
+			stopMeasuring();
+		}
+	
+		commitMeasurements();
+		assertPerformance();
+	} finally {
+		for (int i = 0; i < max; i++) {
+			projects[i].getProject().delete(false, null);
+		}
+	}
+}
+
 public void testStartJDTPlugin() throws JavaModelException {
 	// store current settings
 	long oldSnapInterval = ENV.getWorkspace().getDescription().getSnapshotInterval();	
#P org.eclipse.jdt.core
Index: model/org/eclipse/jdt/internal/core/JavaProjectElementInfo.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/JavaProjectElementInfo.java,v
retrieving revision 1.44
diff -u -r1.44 JavaProjectElementInfo.java
--- model/org/eclipse/jdt/internal/core/JavaProjectElementInfo.java	13 Apr 2007 16:02:15 -0000	1.44
+++ model/org/eclipse/jdt/internal/core/JavaProjectElementInfo.java	18 Apr 2007 17:04:29 -0000
@@ -206,13 +206,17 @@
 				roots = new IPackageFragmentRoot[0];
 				reverseMap.clear();
 			}
+			
+			HashMap otherRoots = JavaModelManager.getJavaModelManager().deltaState.otherRoots;
 			HashtableOfArrayToObject fragmentsCache = new HashtableOfArrayToObject();
 			HashtableOfArrayToObject isPackageCache = new HashtableOfArrayToObject();
 			for (int i = 0, length = roots.length; i < length; i++) {
 				IPackageFragmentRoot root = roots[i];
 				IJavaElement[] frags = null;
 				try {
-					if (root.isArchive() && !root.isOpen()) {
+					if (root.isArchive() 
+							&& !root.isOpen() 
+							&& otherRoots.get(((JarPackageFragmentRoot) root).jarPath) == null/*only if jar belongs to 1 project (https://bugs.eclipse.org/bugs/show_bug.cgi?id=161175)*/) {
 						JarPackageFragmentRootInfo info = new JarPackageFragmentRootInfo();
 						((JarPackageFragmentRoot) root).computeChildren(info, new HashMap());
 						frags = info.children;