Patch the ctsym loading error in nbjavac.VMWrapper

org.eclipse.jdt.core.javac/src/org/eclipse/jdt/core/dom/JavacPatch.java

@@ -0,0 +1,80 @@
+/*******************************************************************************
+* Copyright (c) 2024 Microsoft Corporation and others.
+* All rights reserved. This program and the accompanying materials
+* are made available under the terms of the Eclipse Public License 2.0
+* which accompanies this distribution, and is available at
+* https://www.eclipse.org/legal/epl-2.0/
+*
+* SPDX-License-Identifier: EPL-2.0
+*
+* Contributors:
+*     Microsoft Corporation - initial API and implementation
+*******************************************************************************/
+
+package org.eclipse.jdt.core.dom;
+
+import java.io.IOException;
+import java.lang.ref.Reference;
+import java.lang.ref.SoftReference;
+import java.lang.reflect.Field;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.nio.file.FileSystem;
+import java.nio.file.FileSystems;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Enumeration;
+
+import org.eclipse.core.runtime.FileLocator;
+import org.eclipse.core.runtime.URIUtil;
+
+import nbjavac.VMWrapper;
+
+public class JavacPatch {
+
+	public static void patchVMWrapper() {
+		try {
+			Field cachedCtSymField = VMWrapper.class.getDeclaredField("cachedCtSym");
+			cachedCtSymField.setAccessible(true);
+			if (cachedCtSym.get() == null) {
+				cachedCtSym = new SoftReference<>(findCtSym());
+			}
+			cachedCtSymField.set(null, cachedCtSym);
+		} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) {
+			e.printStackTrace();
+		}
+	}
+
+	private static Reference<Path> cachedCtSym = new SoftReference<>(null);
+
+    public static Path findCtSym() {
+        Path obj = cachedCtSym.get();
+        if (obj instanceof Path) {
+            return obj;
+        }
+        try {
+            ClassLoader loader = VMWrapper.class.getClassLoader();
+            if (loader == null) {
+                loader = ClassLoader.getSystemClassLoader();
+            }
+            Enumeration<URL> en = loader.getResources("META-INF/services/com.sun.tools.javac.platform.PlatformProvider");
+            URL res = en.hasMoreElements() ? en.nextElement() : null;
+            if (res == null) {
+                throw new IllegalStateException("Cannot find ct.sym");
+            }
+            URL jar = FileLocator.resolve(res);
+            String jarFile = jar.getFile();
+            int idx = jarFile.indexOf('!');
+            if (idx >= 0) {
+            	jarFile = jarFile.substring(0, idx);
+            }
+            Path path = Paths.get(URIUtil.fromString(jarFile));
+            FileSystem fs = FileSystems.newFileSystem(path, (ClassLoader) null);
+            Path ctSym = fs.getPath("META-INF", "ct.sym");
+            cachedCtSym = new SoftReference<>(ctSym);
+            return ctSym;
+        } catch (IOException | URISyntaxException ex) {
+            throw new IllegalStateException(ex);
+        }
+    }
+}