fix: Cannot expand for multi-module project (#425)

Author: jdneo

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

@@ -14,6 +14,7 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -581,6 +582,12 @@ public static IJavaProject getJavaProject(String projectUri) {
             return null;
         }
 
+        // For multi-module scenario, findContainersForLocationURI API may return a container array,
+        // need 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()) {

jdtls.ext/com.microsoft.jdtls.ext.core/src/com/microsoft/jdtls/ext/core/model/PackageNode.java

@@ -151,6 +151,9 @@ public void setMetaDataValue(String key, Object value) {
     }
 
     public static PackageNode createNodeForProject(IJavaElement javaElement) {
+        if (javaElement == null || javaElement.getJavaProject() == null) {
+            return null;
+        }
         IProject proj = javaElement.getJavaProject().getProject();
         PackageNode projectNode = new PackageNode(proj.getName(), proj.getFullPath().toPortableString(), NodeKind.PROJECT);
         projectNode.setUri(ProjectUtils.getProjectRealFolder(proj).toFile().toURI().toString());