PT #158478912: Add jrt-fs.jar on classpath for fallback in case of JDK

>8
2018-06-20 14:28:35 -04:00
parent 92699a5691
commit bb9bdff10f
6 changed files with 156 additions and 81 deletions
--- a/headless-services/commons/commons-java/src/main/java/org/springframework/ide/vscode/commons/languageserver/java/JavaUtils.java
+++ b/headless-services/commons/commons-java/src/main/java/org/springframework/ide/vscode/commons/languageserver/java/JavaUtils.java
@@ -0,0 +1,89 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Pivotal, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Pivotal, Inc. - initial API and implementation
+ *******************************************************************************/
+package org.springframework.ide.vscode.commons.languageserver.java;
+
+import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.stream.Stream;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.Supplier;
+
+/**
+ * Various Java installation utility methods
+ *
+ * @author Alex Boyko
+ *
+ */
+public class JavaUtils {
+
+	private static Logger log = LoggerFactory.getLogger(JavaUtils.class);
+
+	/**
+	 * Find JRE libs jars
+	 *
+	 * @param javaMinorVersionSupplier
+	 * @param javaHomeSupplier
+	 * @param bootClasspathSupplier
+	 * @return
+	 */
+	public static Stream<Path> jreLibs(Supplier<String> javaMinorVersionSupplier, Supplier<String> javaHomeSupplier, Supplier<String> bootClasspathSupplier) {
+		String versionString = javaMinorVersionSupplier.get();
+		try {
+			int version = versionString == null ? 8 : Integer.valueOf(versionString);
+			if (version > 8) {
+				String javaHome = javaHomeSupplier.get();
+				if (javaHome != null) {
+					Path rtPath= Paths.get(javaHome, "lib", "jrt-fs.jar");
+					if (Files.exists(rtPath)) {
+						return Stream.of(rtPath);
+					} else {
+						log.error("Cannot find file " + rtPath);
+					}
+				}
+			} else {
+				String s = bootClasspathSupplier.get();
+				if (s != null) {
+					return  Arrays.stream(s.split(File.pathSeparator)).map(File::new).filter(f -> f.canRead()).map(f -> Paths.get(f.toURI()));
+				}
+			}
+		} catch (NumberFormatException e) {
+			log.error("Cannot extract java minor version number.", e);
+		}
+		return Stream.empty();
+	}
+
+	/**
+	 * Extracts java version string from full version string, i.e. "8" from 1.8.0_151, "9" from 9.0.1, "10" from 10.0.1
+	 *
+	 * @param fullVersion
+	 * @return
+	 */
+	public static String getJavaRuntimeMinorVersion(String fullVersion) {
+		String[] tokenized = fullVersion.split("\\.");
+		if (tokenized[0] == "1") {
+			if (tokenized.length > 1) {
+				return tokenized[1];
+			} else {
+				log.error("Cannot determine minor version for the Java Runtime Version: " + fullVersion);
+				return null;
+			}
+		} else {
+			return tokenized[0];
+		}
+	}
+
+}