Fixes java.getPackageData for modules with long name

.vscode/launch.json

@@ -92,18 +92,36 @@
       "outFiles": [ "${workspaceFolder}/dist/**/*.js" ],
       "preLaunchTask": "npm: compile"
     },
+    {
+      "name": "Extension Tests - Multi Module Project",
+      "type": "extensionHost",
+      "request": "launch",
+      "runtimeExecutable": "${execPath}",
+      "args": [
+        "${workspaceFolder}/test/multi-module/",
+        "--extensionDevelopmentPath=${workspaceFolder}",
+        "--extensionTestsPath=${workspaceFolder}/dist/test/multi-module-suite/index"
+      ],
+      "sourceMaps": true,
+      "outFiles": [ "${workspaceFolder}/dist/**/*.js" ],
+      "preLaunchTask": "npm: compile"
+    },
     {
       "name": "Debug UI Command Tests",
       "type": "node",
       "request": "launch",
       "program": "${workspaceFolder}/node_modules/vscode-extension-tester/out/cli.js",
       "args": [
         "setup-and-run",
+        // If not set, will use the current version of vscode. Find a way not to hardcode this value.
+        "--code_version=1.77.0",
         "${workspaceFolder}/dist/test/ui/command.test.js",
       ],
+      // To debug the test code, you must set --mode=development inside the vscode:prepublish task. Find a better way to do this.
+      "sourceMaps": true,
+      "outFiles": [ "${workspaceFolder}/dist/**/*.js" ],
       "console": "integratedTerminal",
-      "internalConsoleOptions": "neverOpen",
-      "preLaunchTask": "npm: compile"
+      // No need to compile the code, vscode:prepublish task that compiles the code is run by vscode-extension-tester
     },
   ]
 }

jdtls.ext/com.microsoft.jdtls.ext.core/src/com/microsoft/jdtls/ext/core/PackageCommand.java

@@ -19,11 +19,13 @@
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 import java.util.function.BiFunction;
 import java.util.stream.Collectors;
 
 import org.apache.commons.lang3.StringUtils;
+import org.eclipse.core.internal.utils.FileUtil;
 import org.eclipse.core.resources.IContainer;
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IFolder;
@@ -577,26 +579,20 @@ private static Object[] findJarDirectoryChildren(JarEntryDirectory directory, St
 
     public static IProject getProject(String projectUri) {
         IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
-        IContainer[] containers = root.findContainersForLocationURI(JDTUtils.toURI(projectUri));
-
-        if (containers.length == 0) {
-            return null;
-        }
-
-        // For multi-module scenario, findContainersForLocationURI API may return a container array,
-        // put the result from the nearest project in front.
-        Arrays.sort(containers, (Comparator<IContainer>) (IContainer a, IContainer b) -> {
-            return a.getFullPath().toPortableString().length() - b.getFullPath().toPortableString().length();
-        });
-
-        for (IContainer container : containers) {
-            IProject project = container.getProject();
-            if (!project.exists()) {
-                return null;
+        URI uri = JDTUtils.toURI(projectUri);
+        IContainer[] containers = root.findContainersForLocationURI(uri);
+
+        Optional<IContainer> maybeProject = Arrays.stream(containers).filter(container -> container instanceof IProject).findFirst();
+        if (maybeProject.isPresent()) {
+        	return (IProject) maybeProject.get();
+        } else {
+            String invisibleProjectName = ProjectUtils.getWorkspaceInvisibleProjectName(FileUtil.toPath(uri).removeTrailingSeparator());
+            IProject invisibleProject = root.getProject(invisibleProjectName);
+            if (!invisibleProject.exists()) {
+                throw new IllegalArgumentException(projectUri + " is neither a Java nor an invisible project.");
             }
-            return project;
+            return invisibleProject;
         }
-        return null;
     }
 
     public static IJavaProject getJavaProject(String projectUri) {