Set default JDK to the lowest configured for managed projects.

- The default project is configured with a (default) JDK, that will produce
  unwanted symbols when other projects don't use the default JRE
- Add testcase

Signed-off-by: Roland Grunberg <[email protected]>

Author: rgrunber

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/JVMConfigurator.java

@@ -18,6 +18,7 @@
 import java.util.Hashtable;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Optional;
 import java.util.Set;
 
 import org.apache.commons.lang3.StringUtils;
@@ -41,6 +42,7 @@
 import org.eclipse.jdt.launching.VMStandin;
 import org.eclipse.jdt.launching.environments.IExecutionEnvironment;
 import org.eclipse.jdt.launching.environments.IExecutionEnvironmentsManager;
+import org.eclipse.jdt.ls.core.internal.managers.IBuildSupport;
 import org.eclipse.jdt.ls.core.internal.managers.ProjectsManager;
 import org.eclipse.jdt.ls.core.internal.preferences.PreferenceManager;
 import org.eclipse.jdt.ls.core.internal.preferences.Preferences;
@@ -108,6 +110,37 @@ public static boolean configureJVMs(Preferences preferences) throws CoreExceptio
 	public static boolean configureJVMs(Preferences preferences, JavaClientConnection connection) throws CoreException {
 		boolean changed = false;
 		boolean defaultVMSet = false;
+
+		IVMInstall minJDK = null;
+		ProjectsManager projectsManager = JavaLanguageServerPlugin.getProjectsManager();
+		for (IProject project : ProjectUtils.getAllProjects(false)) {
+			Optional<IBuildSupport> bs = projectsManager.getBuildSupport(project);
+			if (bs.isPresent() && !ProjectsManager.DEFAULT_PROJECT_NAME.equals(project.getName())) {
+				IJavaProject javaProject = ProjectUtils.getJavaProject(project);
+				if (javaProject != null) {
+					try {
+						IVMInstall vmInstall = JavaRuntime.getVMInstall(javaProject);
+						if (vmInstall instanceof AbstractVMInstall javaVMInstall) {
+							if (minJDK == null || JavaRuntime.compareJavaVersions(minJDK, javaVMInstall.getJavaVersion()) > 0) {
+								minJDK = vmInstall;
+							}
+						}
+					} catch (CoreException e) {
+						// ignore
+					}
+				}
+			}
+		}
+		if (minJDK != null && !Objects.equals(minJDK, JavaRuntime.getDefaultVMInstall())) {
+			try {
+				JavaRuntime.setDefaultVMInstall(minJDK, new NullProgressMonitor());
+				defaultVMSet = true;
+				changed = true;
+			} catch (CoreException e) {
+				// continue
+			}
+		}
+
 		Set<RuntimeEnvironment> runtimes = preferences.getRuntimes();
 		for (RuntimeEnvironment runtime : runtimes) {
 			if (runtime.isValid()) {
@@ -180,8 +213,8 @@ public static boolean configureJVMs(Preferences preferences, JavaClientConnectio
 					}
 					vm = vmStandin.convertToRealVM();
 					if (runtime.isDefault()) {
-						defaultVMSet = true;
-						if (!Objects.equals(vm, JavaRuntime.getDefaultVMInstall())) {
+						if (!defaultVMSet && !Objects.equals(vm, JavaRuntime.getDefaultVMInstall())) {
+							defaultVMSet = true;
 							JavaLanguageServerPlugin.logInfo("Setting runtime " + runtime.getName() + "-" + runtime.getInstallationFile() + " as default global VM");
 							JavaRuntime.setDefaultVMInstall(vm, new NullProgressMonitor());
 							changed = true;

org.eclipse.jdt.ls.tests/src/org/eclipse/jdt/ls/core/internal/JVMConfiguratorTest.java

@@ -12,6 +12,7 @@
  *******************************************************************************/
 package org.eclipse.jdt.ls.core.internal;
 
+import static org.eclipse.jdt.ls.core.internal.ProjectUtils.getJavaSourceLevel;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertNotNull;
@@ -30,6 +31,7 @@
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.FileLocator;
 import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.NullProgressMonitor;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.runtime.URIUtil;
 import org.eclipse.jdt.core.IJavaProject;
@@ -42,11 +44,13 @@
 import org.eclipse.jdt.launching.JavaRuntime;
 import org.eclipse.jdt.launching.LibraryLocation;
 import org.eclipse.jdt.launching.environments.IExecutionEnvironment;
+import org.eclipse.jdt.ls.core.internal.handlers.WorkspaceSymbolHandler;
 import org.eclipse.jdt.ls.core.internal.managers.AbstractInvisibleProjectBasedTest;
 import org.eclipse.jdt.ls.core.internal.preferences.ClientPreferences;
 import org.eclipse.jdt.ls.core.internal.preferences.Preferences;
 import org.eclipse.lsp4j.MessageParams;
 import org.eclipse.lsp4j.MessageType;
+import org.eclipse.lsp4j.SymbolInformation;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
@@ -246,6 +250,19 @@ public void testInvalidRuntime() throws Exception {
 		assertEquals("Invalid runtime for " + runtime.getName() + ": 'bin' should be removed from the path (" + runtime.getPath() + ").", notification.getMessage());
 	}
 
+	// https://github.com/redhat-developer/vscode-java/issues/3452
+	@Test
+	public void testJavaRuntimesDoNotLeak() throws Exception {
+		importProjects("maven/salut-java11");
+		IProject project = WorkspaceHelper.getProject("salut-java11");
+		assertIsJavaProject(project);
+		assertEquals("11", getJavaSourceLevel(project));
+		JVMConfigurator.configureJVMs(preferences, javaClient);
+		List<SymbolInformation> results = WorkspaceSymbolHandler.search("java.lang.Object", new NullProgressMonitor());
+		int numOfObjectSymbols = results.stream().filter(s -> "java.lang".equals(s.getContainerName()) && "Object".equals(s.getName())).toList().size();
+		assertEquals(1, numOfObjectSymbols);
+	}
+
 	private void assertComplianceAndPreviewSupport(IJavaProject javaProject, String compliance, boolean previewEnabled) {
 		assertEquals(previewEnabled ? JavaCore.ENABLED : JavaCore.DISABLED, javaProject.getOption(JavaCore.COMPILER_PB_ENABLE_PREVIEW_FEATURES, true));
 		assertEquals(compliance, javaProject.getOption(JavaCore.COMPILER_COMPLIANCE, true));