WIP: make EclipseHelper with with Java 11+

ctrueden · ctrueden · commit 9485afaad054 · 2023-10-13T16:59:50.000+02:00
diff --git a/pom.xml b/pom.xml
@@ -219,11 +219,19 @@
 				<artifactId>exec-maven-plugin</artifactId>
 				<executions>
 					<execution>
+						<id>index-main-classes</id>
 						<phase>process-classes</phase>
 						<goals>
 							<goal>java</goal>
 						</goals>
 					</execution>
+					<execution>
+						<id>index-test-classes</id>
+						<phase>process-test-classes</phase>
+						<goals>
+							<goal>java</goal>
+						</goals>
+					</execution>
 				</executions>
 				<configuration>
 					<mainClass>org.scijava.annotations.EclipseHelper</mainClass>
diff --git a/src/main/java/org/scijava/annotations/EclipseHelper.java b/src/main/java/org/scijava/annotations/EclipseHelper.java
@@ -31,9 +31,13 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLClassLoader;
+import java.util.Arrays;
 import java.util.HashSet;
 import java.util.Set;
 import java.util.jar.Attributes.Name;
@@ -100,8 +104,8 @@ public class EclipseHelper extends DirectoryIndexer {
 	static Set<URL> indexed = new HashSet<>();
 	private boolean bannerShown;
 
-	private static boolean debug =
-		"debug".equals(System.getProperty("scijava.log.level"));
+	private static boolean debug = true;
+		//"debug".equals(System.getProperty("scijava.log.level"));
 	private boolean autoDetectEclipse = true;
 
 	private static void debug(final String message) {
@@ -125,18 +129,16 @@ private static void debug(final String message) {
 	 */
 	public static void updateAnnotationIndex(final ClassLoader loader) {
 		debug("Checking class loader: " + loader);
-		if (loader == null ||
-			!(loader instanceof URLClassLoader))
-		{
-			debug("Not an URLClassLoader: " + loader);
+		if (loader == null) {
+			debug("Null ClassLoader!");
 			return;
 		}
 		EclipseHelper helper = new EclipseHelper();
 		if (Boolean.getBoolean(FORCE_ANNOTATION_INDEX_PROPERTY)) {
 			helper.autoDetectEclipse = false;
 		}
 		boolean first = true;
-		for (final URL url : ((URLClassLoader) loader).getURLs()) {
+		for (final URL url : getURLs(loader)) {
 			debug("Checking URL: " + url);
 			if (helper.autoDetectEclipse && first) {
 				if (!"file".equals(url.getProtocol()) ||
@@ -282,6 +284,31 @@ else if (file.isDirectory()) {
 		return true;
 	}
 
+	private static URL[] getURLs(final ClassLoader classLoader) {
+		// -- Java 8 --
+		if (classLoader instanceof URLClassLoader) {
+			return ((URLClassLoader) classLoader).getURLs();
+		}
+
+		// -- Java 11+ --
+		try {
+			// URLClassPath ucp = classLoader.ucp;
+			final Field ucpField = classLoader.getClass().getDeclaredField("ucp");
+			ucpField.setAccessible(true);
+			final Object ucp = ucpField.get(classLoader);
+
+			// return ucp.getURLs();
+			final Method getURLs = ucp.getClass().getDeclaredMethod("getURLs");
+			return (URL[]) getURLs.invoke(ucp);
+		}
+		catch (final NoSuchMethodException | IllegalAccessException |
+			InvocationTargetException | NoSuchFieldException e)
+		{
+			e.printStackTrace();
+			return new URL[0];
+		}
+	}
+
 	/**
 	 * Updates the annotation index in the current Eclipse project.
 	 * <p>
