}

	public void testManagingPreBuildIndexFile() throws CoreException, IOException {

		// locate the JDT core preference

		String prefNodeName = "org.eclipse.jdt.core";

		IEclipsePreferences prefs = InstanceScope.INSTANCE.getNode(prefNodeName);

		if(prefs == null) {

			fail("The preferences for '" + prefNodeName + "' could not be located.");

		}

		// create the pre-built index

		File indexFile = null;

		String jarFilePath = getExternalResourcePath("Test.jar");

		File jarFile = new File(jarFilePath);

		IJavaProject p = null;

		try {

			createJar(new String[] {

					"pkg/Test.java",

					"package pkg;\n" +

					"public class Test {\n" +

					"  protected Test(int i) {}\n" +

					"  protected void helloWorld() {}\n" +

					"}"}, jarFilePath);

			indexFile = new File(getExternalResourcePath("Test.index"));

			JavaIndexer.generateIndexForJar(jarFilePath, indexFile.getAbsolutePath());

			// create project P and add the Test.jar to the classpath (associate the index to it)

			p = createJavaProject("P");

			Path libPath = new Path(jarFilePath);

			IClasspathAttribute attribute = JavaCore.newClasspathAttribute(IClasspathAttribute.INDEX_LOCATION_ATTRIBUTE_NAME, indexFile.toURI().toURL().toString());

			IClasspathEntry entry = JavaCore.newLibraryEntry(libPath, null, null, null, new IClasspathAttribute[]{attribute}, false);

			this.setClasspath(p, new IClasspathEntry[] {entry});

			AbstractJavaModelTests.waitUntilIndexesReady();

			// verify the current index is correct

			this.resultCollector = new JavaSearchResultCollector();

			this.search("helloWorld", METHOD, DECLARATIONS, EXACT_RULE, SearchEngine.createJavaSearchScope(new IJavaElement[]{p}));

			this.assertSearchResults(getExternalPath() + "Test.jar void pkg.Test.helloWorld()");

			// enable the preference for JDT to manage pre-build index files

			prefs.put(JavaCore.MANAGE_PREBUILT_INDEXES, JavaCore.ENABLED);

			// update the JAR file (simulate the JAR file changing)

			createJar(new String[] {

					"pkg/Test.java",

					"package pkg;\n" +

					"public class Test {\n" +

					"  protected Test(int i) {}\n" +

					"  protected void helloWorld(int i) {}\n" +

					"}"}, jarFilePath);

			// restart the product so the index manager enables management of pre-build indexes

			this.simulateExitRestart();

			// verify that the index is updated

			AbstractJavaModelTests.waitUntilIndexesReady();

			this.resultCollector = new JavaSearchResultCollector();

			this.search("helloWorld", METHOD, DECLARATIONS, EXACT_RULE, SearchEngine.createJavaSearchScope(new IJavaElement[]{p}));

			this.assertSearchResults(getExternalPath() + "Test.jar void pkg.Test.helloWorld(int)");

		}

		finally {

			// restart the product so the index manager disables management of pre-build indexes

			prefs.put(JavaCore.MANAGE_PREBUILT_INDEXES, JavaCore.DISABLED);

			this.simulateExitRestart();

			// clean-up artifacts that were created

			if(p != null) {

				deleteProject("P");

			}

			if (indexFile != null) {

				indexFile.delete();

			}

			jarFile.delete();

		}

	}

}