Fix NPE in MavenLemminxExtension.sortProjects and the similar ones

lemminx-maven/src/main/java/org/eclipse/lemminx/extensions/maven/MavenLemminxExtension.java

@@ -457,7 +457,8 @@ private Collection<URI> sortProjects(Collection<URI> projectsUris) {
  Optional.ofNullable(projectsUris).ifPresent(uris -> {
  uris.stream().filter(Objects::nonNull).forEach(uri ->{
  Optional.ofNullable(createDOMDocument(uri)).ifPresent(doc -> {
- if (PROJECT_ELT.equals(doc.getDocumentElement().getNodeName())) {
+ if (doc.getDocumentElement() != null
+ && PROJECT_ELT.equals(doc.getDocumentElement().getNodeName())) {
  Optional.ofNullable(MavenParseUtils.parseArtifact(doc.getDocumentElement())).ifPresent(a -> {
  Parent p = MavenParseUtils.parseParent(DOMUtils.findChildElement(doc.getDocumentElement(), PARENT_ELT).orElse(null));
  // If artifact groupId is null - set it from parent
@@ -480,12 +481,17 @@ private Collection<URI> sortProjects(Collection<URI> projectsUris) {
  });
  });
 
+ LinkedHashSet<URI> skippedUris = new LinkedHashSet<>();
  uris.stream().filter(Objects::nonNull).forEach(uri -> {
  String a = depByUri.get(uri);
  if (a != null) {
  adUrisdParentFirst(a, parentByDep, uriByDep, resultUris);
+ } else {
+ skippedUris.add(uri);
  }
  });
+ // Add skipped IRIs to the end of the collection
+ resultUris.addAll(skippedUris);
  });
  return resultUris;
  }

lemminx-maven/src/main/java/org/eclipse/lemminx/extensions/maven/MavenProjectCache.java

@@ -147,6 +147,8 @@ public InputStream getInputStream() throws IOException {
  projectCache.put(uri, buildResult.getProject());
  projectParsedListeners.forEach(listener -> listener.accept(buildResult.getProject()));
  }
+ lastCheckedVersion.put(uri, document.getTextDocument().getVersion());
+ problemCache.put(uri, problems);
  } catch (ProjectBuildingException e) {
  if (e.getResults() == null) {
  if (e.getCause() instanceof ModelBuildingException modelBuildingException) {
@@ -193,12 +195,14 @@ public InputStream getInputStream() throws IOException {
  }
  }
  }
+ lastCheckedVersion.put(uri, document.getTextDocument().getVersion());
+ problemCache.put(uri, problems);
  } catch (Exception e) {
+ // Do not add any info, like lastCheckedVersion or problems, to the cache 
+ // In case of project/problems etc. is not available due to an exception happened.
+ // 
  LOGGER.log(Level.SEVERE, e.getMessage(), e);
  }
-
- lastCheckedVersion.put(uri, document.getTextDocument().getVersion());
- problemCache.put(uri, problems);
  }
 
  private ProjectBuildingRequest newProjectBuildingRequest() {

lemminx-maven/src/main/java/org/eclipse/lemminx/extensions/maven/participants/completion/MavenCompletionParticipant.java

@@ -588,19 +588,21 @@ private void addPluginPackagingTypes(Set<String> packagingTypes, Artifact artifa
  JarEntry componentsxml = jarFile.getJarEntry(COMPONENTS_PATH);
  if (componentsxml != null) {
  Document doc = db.parse(jarFile.getInputStream(componentsxml));
- doc.getDocumentElement().normalize();
- NodeList components = doc.getElementsByTagName(COMPONENTS_COMPONENT_ELT);
- for (int i = 0; i < components.getLength(); i++) {
- Node component = components.item(i);
- if (component.getNodeType() == Node.ELEMENT_NODE) {
- Element element = (Element) component;
- String role = element.getElementsByTagName(COMPONENTS_ROLE_ELT).item(0).getTextContent();
- if (ArtifactHandler.ROLE.equals(role)) {
- Node config = element.getElementsByTagName(COMPONENTS_CONFIGURATION_ELT).item(0);
- if (config.getNodeType() == Node.ELEMENT_NODE) {
- Element configEl = (Element) config;
- String name = configEl.getElementsByTagName(COMPONENTS_TYPE_ELT).item(0).getTextContent();
- packagingTypes.add(name);
+ if (doc.getDocumentElement() != null) {
+ doc.getDocumentElement().normalize();
+ NodeList components = doc.getElementsByTagName(COMPONENTS_COMPONENT_ELT);
+ for (int i = 0; i < components.getLength(); i++) {
+ Node component = components.item(i);
+ if (component.getNodeType() == Node.ELEMENT_NODE) {
+ Element element = (Element) component;
+ String role = element.getElementsByTagName(COMPONENTS_ROLE_ELT).item(0).getTextContent();
+ if (ArtifactHandler.ROLE.equals(role)) {
+ Node config = element.getElementsByTagName(COMPONENTS_CONFIGURATION_ELT).item(0);
+ if (config.getNodeType() == Node.ELEMENT_NODE) {
+ Element configEl = (Element) config;
+ String name = configEl.getElementsByTagName(COMPONENTS_TYPE_ELT).item(0).getTextContent();
+ packagingTypes.add(name);
+ }
  }
  }
  }

lemminx-maven/src/main/java/org/eclipse/lemminx/extensions/maven/participants/diagnostics/MavenDiagnosticParticipant.java

@@ -60,6 +60,9 @@ public void doDiagnostics(DOMDocument xmlDocument, List<Diagnostic> diagnostics,
  }
 
  DOMElement documentElement = xmlDocument.getDocumentElement();
+ if (documentElement == null) {
+ return;
+ }
  Map<String, Function<DiagnosticRequest, Optional<List<Diagnostic>>>> tagDiagnostics = configureDiagnosticFunctions();
 
  // Validate project element

lemminx-maven/src/test/java/org/eclipse/lemminx/extensions/maven/participants/definition/WorkspaceProjectsHyperlinkDetectorTest.java

@@ -55,7 +55,9 @@ public class WorkspaceProjectsHyperlinkDetectorTest {
  public static String TOOLS_SPRINGFRAMEWORK_PARENT = "tools.internal";
  public static String TOOLS_BOM_PATH = "/tools/modules/BOM/pom.xml";
  public static String TOOLS_BOM_PARENT = "tools";
-
+ public static String PROJECT_PATH = "/project/pom.xml";
+ public static String PROJECT_PARENT = "root";
+
  public static String TOOLS_RETRY_SPRINGFRAMEWORK_PATH = "/tools/modules/retry-springframework/pom.xml";
  public static String TOOLS_RETRY_SPRINGFRAMEWORK_SPRING_BOOT_DEPENDENCIES_TARGET_ARTIFACT = "spring-boot-dependencies";
  public static String TOOLS_RETRY_SPRINGFRAMEWORK_SPRING_BOOT_DEPENDENCIES_TARGET_GROUP = "org.springframework.boot";
@@ -242,6 +244,47 @@ public void testHyperlinkFromToolsBomToParentDocument()
  assertTrue(definitions.stream().map(LocationLink::getTargetUri).anyMatch(uri -> uriiRawPathEndsWith(uri, "/issue-345/tools/pom.xml")));
  }
 
+ /**
+ * Test Ctrl-clicking on parent for artifact 'project'. 
+ * The resulting URI should lead to parent artifact 'root'
+ * 
+ * @throws IOException
+ * @throws InterruptedException
+ * @throws ExecutionException
+ * @throws URISyntaxException
+ * @throws BadLocationException
+ */
+ @Test
+ public void testHyperlinkFromProjectToParentDocument()
+ throws IOException, InterruptedException, ExecutionException, URISyntaxException, BadLocationException {
+ // We need the WORKSPACE projects to be placed to MavenProjectCache
+ IWorkspaceServiceParticipant workspaceService = languageService.getWorkspaceServiceParticipants().stream().filter(MavenWorkspaceService.class::isInstance).findAny().get();
+ assertNotNull(workspaceService);
+
+ URI folderUri = getClass().getResource(WORKSPACE_PATH).toURI();
+ WorkspaceFolder wsFolder = new WorkspaceFolder(folderUri.toString());
+
+ // Add folders to MavenProjectCache
+ workspaceService.didChangeWorkspaceFolders(
+ new DidChangeWorkspaceFoldersParams(
+ new WorkspaceFoldersChangeEvent (
+ Arrays.asList(new WorkspaceFolder[] {wsFolder}), 
+ Arrays.asList(new WorkspaceFolder[0]))));
+
+ DOMDocument document = createDOMDocument(WORKSPACE_PATH + PROJECT_PATH, languageService);
+ DOMElement parent = DOMUtils.findChildElement(document.getDocumentElement(), DOMConstants.PARENT_ELT).orElse(null);
+ assertNotNull(parent, "Parent element not found!");
+ DOMElement parentArtifactId = DOMUtils.findChildElement(parent, DOMConstants.ARTIFACT_ID_ELT).orElse(null);
+ assertNotNull(parentArtifactId, "Parent ArtifactId element not found!");
+ int offset = (parentArtifactId.getStart() + parentArtifactId.getEnd()) / 2;
+
+ TextDocument textDocument = document.getTextDocument();
+ Position offsetPosition = textDocument.positionAt(offset);
+ List<? extends LocationLink> definitions = languageService.findDefinition(document, offsetPosition, ()->{});
+ definitions.stream().map(LocationLink::getTargetUri).forEach(uri -> System.out.println("testHyperlinkFromProjectToParentDocument(): " + uri));
+ assertTrue(definitions.stream().map(LocationLink::getTargetUri).anyMatch(uri -> uriiRawPathEndsWith(uri, "/issue-345/root/pom.xml")));
+ }
+
  //
  // Test Ctrl-clicking on a dependency element
  //

lemminx-maven/src/test/java/org/eclipse/lemminx/extensions/maven/participants/hover/WorkspaceProjectsHoverTest.java

@@ -55,6 +55,8 @@ public class WorkspaceProjectsHoverTest {
  public static String TOOLS_SPRINGFRAMEWORK_PARENT = "tools.internal";
  public static String TOOLS_BOM_PATH = "/tools/modules/BOM/pom.xml";
  public static String TOOLS_BOM_PARENT = "tools";
+ public static String PROJECT_PATH = "/project/pom.xml";
+ public static String PROJECT_PARENT = "root";
 
  public static String TOOLS_RETRY_SPRINGFRAMEWORK_PATH = "/tools/modules/retry-springframework/pom.xml";
  public static String TOOLS_RETRY_SPRINGFRAMEWORK_SPRING_BOOT_DEPENDENCIES_TARGET_ARTIFACT = "spring-boot-dependencies";
@@ -252,6 +254,49 @@ public void testHoverFromToolsBomToParentDocument()
  r(8, 14, 8, 19), settings);
  }
 
+ /**
+ * Test hover on parent for artifact 'project'. 
+ * The resulting hover should show parent artifact 'root'
+ * 
+ * @throws IOException
+ * @throws InterruptedException
+ * @throws ExecutionException
+ * @throws URISyntaxException
+ * @throws BadLocationException
+ */
+ @Test
+ public void testHoverFromProjectToParentDocument()
+ throws IOException, InterruptedException, ExecutionException, URISyntaxException, BadLocationException {
+ // We need the WORKSPACE projects to be placed to MavenProjectCache
+ IWorkspaceServiceParticipant workspaceService = languageService.getWorkspaceServiceParticipants().stream().filter(MavenWorkspaceService.class::isInstance).findAny().get();
+ assertNotNull(workspaceService);
+
+ URI folderUri = getClass().getResource(WORKSPACE_PATH).toURI();
+ WorkspaceFolder wsFolder = new WorkspaceFolder(folderUri.toString());
+
+ // Add folders to MavenProjectCache
+ workspaceService.didChangeWorkspaceFolders(
+ new DidChangeWorkspaceFoldersParams(
+ new WorkspaceFoldersChangeEvent (
+ Arrays.asList(new WorkspaceFolder[] {wsFolder}), 
+ Arrays.asList(new WorkspaceFolder[0]))));
+
+ DOMDocument document = createDOMDocument(WORKSPACE_PATH + PROJECT_PATH, languageService);
+ DOMElement parent = DOMUtils.findChildElement(document.getDocumentElement(), DOMConstants.PARENT_ELT).orElse(null);
+ assertNotNull(parent, "Parent element not found!");
+ DOMElement parentArtifactId = DOMUtils.findChildElement(parent, DOMConstants.ARTIFACT_ID_ELT).orElse(null);
+ assertNotNull(parentArtifactId, "Parent ArtifactId element not found!");
+ int offset = (parentArtifactId.getStart() + parentArtifactId.getEnd()) / 2;
+
+ String text = document.getText();
+ text = text.substring(0, offset) + '|' + text.substring(offset);
+ ContentModelSettings settings = new ContentModelSettings();
+ settings.setUseCache(false);
+ assertHover(languageService, text, null, document.getDocumentURI(), 
+ "**" + PROJECT_PARENT + "**",
+ r(8, 14, 8, 18), settings);
+ }
+
  //
  // Test hovering over external dependency element
  //

lemminx-maven/src/test/resources/issue-345/broken/pom.xml

@@ -0,0 +1 @@
+<?