initial re-work of async behavior of language server, looking at the text document service first

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/app/PropertiesJavaDefinitionHandler.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2018, 2020 Pivotal, Inc.
+ * Copyright (c) 2018, 2021 Pivotal, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -63,7 +63,7 @@ public class PropertiesJavaDefinitionHandler implements DefinitionHandler, Langu
 	@Override
 	public List<LocationLink> handle(DefinitionParams definitionParams) {
 		try {
-			TextDocument doc = documents.get(definitionParams);
+			TextDocument doc = documents.getLatestSnapshot(definitionParams);
 			TypeUtil typeUtil = params.typeUtilProvider.getTypeUtil(sourceLinks, doc);
 			FuzzyMap<PropertyInfo> index = params.indexProvider.getIndex(doc).getProperties();
 			int offset;

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/app/XmlBeansConfigDefinitionHandler.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2019, 2020 Pivotal, Inc.
+ * Copyright (c) 2019, 2021 Pivotal, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -99,7 +99,7 @@ public class XmlBeansConfigDefinitionHandler implements DefinitionHandler, Langu
 		
 		JavaTypeHyperlinkProvider javaTypeHyperlinkProvider = new JavaTypeHyperlinkProvider(projectFinder, locationProvider);
 		PropertyNameHyperlinkProvider propertyNameHyperlinkProvider = new PropertyNameHyperlinkProvider(projectFinder, locationProvider);
-		BeanRefHyperlinkProvider beanRefHyperlinkProvider = new BeanRefHyperlinkProvider(projectFinder, symbolIndex, documents);
+		BeanRefHyperlinkProvider beanRefHyperlinkProvider = new BeanRefHyperlinkProvider(projectFinder, symbolIndex);
 		
 		List<JavaTypeHyperlinkProvider> typeHandlersOnly = Arrays.asList(javaTypeHyperlinkProvider);
 		List<PropertyNameHyperlinkProvider> propertyNameHandlers = Arrays.asList(propertyNameHyperlinkProvider);
@@ -143,7 +143,7 @@ public class XmlBeansConfigDefinitionHandler implements DefinitionHandler, Langu
 	public List<LocationLink> handle(DefinitionParams params) {
 		try {
 			if (config.isSpringXMLSupportEnabled() && config.areXmlHyperlinksEnabled()) {
-				TextDocument doc = documents.get(params);
+				TextDocument doc = documents.getLatestSnapshot(params);
 				if (doc != null) {
 					String content = doc.get();
 	

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/app/YamlPropertiesJavaDefinitionHandler.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2018, 2020 Pivotal, Inc.
+ * Copyright (c) 2018, 2021 Pivotal, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -70,7 +70,7 @@ public class YamlPropertiesJavaDefinitionHandler implements DefinitionHandler, L
 	@Override
 	public List<LocationLink> handle(DefinitionParams definitionParams) {
 		try {
-			TextDocument doc = documents.get(definitionParams);
+			TextDocument doc = documents.getLatestSnapshot(definitionParams);
 			int offset = doc.toOffset(definitionParams.getPosition());
 			YamlFileAST ast = getAst(doc);
 			if (ast != null) {

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/java/handlers/BootJavaCodeLensEngine.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2017, 2018 Pivotal, Inc.
+ * Copyright (c) 2017, 2021 Pivotal, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -40,8 +40,8 @@ public class BootJavaCodeLensEngine implements CodeLensHandler {
 		SimpleTextDocumentService documents = server.getTextDocumentService();
 		String docURI = params.getTextDocument().getUri();
 
-		if (documents.get(docURI) != null) {
-			TextDocument doc = documents.get(docURI).copy();
+		TextDocument doc = documents.getLatestSnapshot(docURI);
+		if (doc != null) {
 			// Spring Boot LS get events from boot properties files as well, so filter them out
 			if (server.getInterestingLanguages().contains(doc.getLanguageId())) {
 				try {

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/java/handlers/BootJavaDocumentHighlightEngine.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2018, 2020 Pivotal, Inc.
+ * Copyright (c) 2018, 2021 Pivotal, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -42,10 +42,9 @@ public class BootJavaDocumentHighlightEngine implements DocumentHighlightHandler
 	@Override
 	public List<DocumentHighlight> handle(DocumentHighlightParams params) {
 		SimpleTextDocumentService documents = server.getTextDocumentService();
-		String docURI = params.getTextDocument().getUri();
-
-		if (documents.get(docURI) != null) {
-			TextDocument doc = documents.get(docURI).copy();
+		TextDocument doc = documents.getLatestSnapshot(params);
+		
+		if (doc != null) {
 			// Spring Boot LS get events from boot properties files as well, so filter them out
 			if (doc != null && server.getInterestingLanguages().contains(doc.getLanguageId())) {
 				try {

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/java/handlers/BootJavaHoverProvider.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2017, 2020 Pivotal, Inc.
+ * Copyright (c) 2017, 2021 Pivotal, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -73,8 +73,9 @@ public class BootJavaHoverProvider implements HoverHandler {
 	@Override
 	public Hover handle(HoverParams params) {
 		SimpleTextDocumentService documents = server.getTextDocumentService();
-		if (documents.get(params) != null) {
-			TextDocument doc = documents.get(params).copy();
+		TextDocument doc = documents.getLatestSnapshot(params);
+		
+		if (doc != null) {
 			// Spring Boot LS get events from boot properties files as well, so filter them out
 			if (server.getInterestingLanguages().contains(doc.getLanguageId())) {
 				try {

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/java/handlers/BootJavaReferencesHandler.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2017, 2020 Pivotal, Inc.
+ * Copyright (c) 2017, 2021 Pivotal, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -53,8 +53,9 @@ public class BootJavaReferencesHandler implements ReferencesHandler {
 
 	@Override
 	public List<? extends Location> handle(ReferenceParams params) {
-		SimpleTextDocumentService documents = server.getTextDocumentService();
-		TextDocument doc = documents.get(params).copy();
+		SimpleTextDocumentService documents = server.getTextDocumentService();		
+		TextDocument doc = documents.getLatestSnapshot(params);
+
 		if (doc != null) {
 			// Spring Boot LS get events from boot properties files as well, so filter them out
 			if (server.getInterestingLanguages().contains(doc.getLanguageId())) {

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/java/livehover/v2/SpringProcessLiveHoverUpdater.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2017, 2019 Pivotal, Inc.
+ * Copyright (c) 2017, 2021 Pivotal, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -37,10 +37,10 @@ public class SpringProcessLiveHoverUpdater {
 
 	private final SimpleLanguageServer server;
 	private final BootJavaHoverProvider hoverProvider;
+	private final JavaProjectFinder projectFinder;
 
-	private boolean highlightsEnabled = true;
-	private JavaProjectFinder projectFinder;
 	private final Map<String, AtomicReference<IJavaProject>> watchedDocs;
+	private boolean highlightsEnabled = true;
 
 	public SpringProcessLiveHoverUpdater(
 			SimpleLanguageServer server,
@@ -56,11 +56,7 @@ public class SpringProcessLiveHoverUpdater {
 		server.getTextDocumentService().onDidChangeContent(params -> {
 			TextDocument doc = params.getDocument();
 			if (BootJavaLanguageServerComponents.LANGUAGES.contains(doc.getLanguageId())) {
-				try {
-					watchDocument(doc.getUri());
-				} catch (Throwable t) {
-					log.error("", t);
-				}
+				watchDocument(doc.getUri());
 			}
 		});
 		
@@ -81,7 +77,14 @@ public class SpringProcessLiveHoverUpdater {
 
 	public void watchDocument(String docURI) {
 		this.watchedDocs.putIfAbsent(docURI, new AtomicReference<IJavaProject>());
-		updateDoc(docURI);
+		
+		CompletableFuture.runAsync(() -> {
+			try {
+				updateDoc(docURI);
+			} catch (Throwable t) {
+				log.error("", t);
+			}
+		});
 	}
 
 	public void unwatchDocument(String docURI) {
@@ -89,6 +92,7 @@ public class SpringProcessLiveHoverUpdater {
 		cleanupLiveHints(docURI);
 	}
 
+	// runs async
 	private void updateDoc(String docURI) {
 		try {
 			IJavaProject project = getCachedProject(docURI);
@@ -99,6 +103,7 @@ public class SpringProcessLiveHoverUpdater {
 		}
 	}
 
+	// runs async
 	private void update() {
 		if (this.watchedDocs.size() > 0) {
 			try {
@@ -112,10 +117,11 @@ public class SpringProcessLiveHoverUpdater {
 		}
 	}
 
+	// runs async
 	private void update(String docURI, IJavaProject project) {
 		if (highlightsEnabled) {
 			try {
-				TextDocument doc = this.server.getTextDocumentService().get(docURI);
+				TextDocument doc = this.server.getTextDocumentService().getLatestSnapshot(docURI);
 				if (doc != null) {
 					CodeLens[] infos = this.hoverProvider.getLiveHoverHints(doc, project);
 					publishLiveHints(docURI, infos);
@@ -126,6 +132,7 @@ public class SpringProcessLiveHoverUpdater {
 		}
 	}
 
+	// runs async
 	private IJavaProject getCachedProject(String docURI) {
 		AtomicReference<IJavaProject> reference = this.watchedDocs.get(docURI);
 		if (reference != null) {
@@ -141,8 +148,9 @@ public class SpringProcessLiveHoverUpdater {
 		return null;
 	}
 
+	// runs async
 	private IJavaProject identifyProject(String docURI) {
-		TextDocument doc = this.server.getTextDocumentService().get(docURI);
+		TextDocument doc = this.server.getTextDocumentService().getLatestSnapshot(docURI);
 		if (doc != null) {
 			return projectFinder.find(doc.getId()).orElse(null);
 		}
@@ -151,8 +159,9 @@ public class SpringProcessLiveHoverUpdater {
 		}
 	}
 
+	// runs sync or async
 	private void publishLiveHints(String docURI, CodeLens[] codeLenses) {
-		TextDocument doc = server.getTextDocumentService().get(docURI);
+		TextDocument doc = server.getTextDocumentService().getLatestSnapshot(docURI);
 		if (doc != null) {
 			int version = doc.getVersion();
 			VersionedTextDocumentIdentifier id = new VersionedTextDocumentIdentifier(docURI, version);
@@ -160,8 +169,9 @@ public class SpringProcessLiveHoverUpdater {
 		}
 	}
 
+	// runs sync or async
 	private void cleanupLiveHints(String docURI) {
 		publishLiveHints(docURI, new CodeLens[0]);
 	}
-
+	
 }

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/java/utils/CompilationUnitCache.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2017, 2020 Pivotal, Inc.
+ * Copyright (c) 2017, 2021 Pivotal, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -18,9 +18,6 @@ import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
-import java.util.concurrent.locks.ReentrantReadWriteLock;
-import java.util.concurrent.locks.ReentrantReadWriteLock.ReadLock;
-import java.util.concurrent.locks.ReentrantReadWriteLock.WriteLock;
 import java.util.function.Function;
 import java.util.stream.Stream;
 
@@ -45,13 +42,11 @@ import org.springframework.ide.vscode.commons.languageserver.java.JavaProjectFin
 import org.springframework.ide.vscode.commons.languageserver.java.ProjectObserver;
 import org.springframework.ide.vscode.commons.languageserver.util.SimpleLanguageServer;
 import org.springframework.ide.vscode.commons.languageserver.util.SimpleTextDocumentService;
-import org.springframework.ide.vscode.commons.util.AsyncRunner;
 import org.springframework.ide.vscode.commons.util.text.TextDocument;
 
 import com.google.common.cache.Cache;
 import com.google.common.cache.CacheBuilder;
 
-import reactor.core.scheduler.Schedulers;
 import reactor.util.function.Tuple2;
 import reactor.util.function.Tuples;
 
@@ -62,95 +57,94 @@ public final class CompilationUnitCache implements DocumentContentProvider {
 	private static final long CU_ACCESS_EXPIRATION = 1;
 	private JavaProjectFinder projectFinder;
 	private ProjectObserver projectObserver;
-	private Cache<URI, CompilationUnit> uriToCu;
-	private Cache<IJavaProject, Set<URI>> projectToDocs;
-	private Cache<IJavaProject, Tuple2<List<Classpath>, INameEnvironmentWithProgress>> lookupEnvCache;
-	private ProjectObserver.Listener projectListener;
-	private SimpleTextDocumentService documents;
-	private AsyncRunner async;
+	
+	private final ProjectObserver.Listener projectListener;
+	private final SimpleTextDocumentService documentService;
+//	private AsyncRunner async;
 
-	private ReadLock readLock;
-	private WriteLock writeLock;
+	private final Cache<URI, CompilationUnit> uriToCu;
+	private final Cache<IJavaProject, Set<URI>> projectToDocs;
+	private final Cache<IJavaProject, Tuple2<List<Classpath>, INameEnvironmentWithProgress>> lookupEnvCache;
+
+//	private ReadLock readLock;
+//	private WriteLock writeLock;
 
 	public CompilationUnitCache(JavaProjectFinder projectFinder, SimpleLanguageServer server, ProjectObserver projectObserver) {
 		this.projectFinder = projectFinder;
 		this.projectObserver = projectObserver;
-		this.lookupEnvCache = CacheBuilder.newBuilder().build();
 		
 		// PT 154618835 - Avoid retaining the CU in the cache as it consumes memory if it hasn't been
 		// accessed after some time
-		uriToCu = CacheBuilder.newBuilder()
+		this.uriToCu = CacheBuilder.newBuilder()
 				.expireAfterWrite(CU_ACCESS_EXPIRATION, TimeUnit.MINUTES)
 				.build();
-		projectToDocs = CacheBuilder.newBuilder().build();
+		this.projectToDocs = CacheBuilder.newBuilder().build();
+		this.lookupEnvCache = CacheBuilder.newBuilder().build();
 
-		ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
-		readLock = lock.readLock();
-		writeLock = lock.writeLock();
+//		ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
+//		this.readLock = lock.readLock();
+//		this.writeLock = lock.writeLock();
 
-		this.documents = server == null ? null : server.getTextDocumentService();
-		this.async = server == null ? new AsyncRunner(Schedulers.single()) : server.getAsync();
+		this.documentService = server == null ? null : server.getTextDocumentService();
+//		this.async = server == null ? new AsyncRunner(Schedulers.single()) : server.getAsync();
 		
 
-		if (documents != null) {
-			documents.onDidChangeContent(doc -> invalidateCuForJavaFile(doc.getDocument().getId().getUri()));
-			documents.onDidClose(doc -> invalidateCuForJavaFile(doc.getId().getUri()));
+		// IMPORTANT ===> these notifications arrive within the lsp message loop, so reactions to them have to be fast
+		// and not be blocked by waiting for anything
+		if (documentService != null) {
+			documentService.onDidChangeContent(doc -> invalidateCuForJavaFile(doc.getDocument().getId().getUri()));
+			documentService.onDidClose(doc -> invalidateCuForJavaFile(doc.getId().getUri()));
+		}
+
+		for (IJavaProject project : projectFinder.all()) {
+			logger.info("CU Cache: initial lookup env creation for project <{}>", project.getElementName());
+			loadLookupEnvTuple(project);
 		}
 
-		async.execute(() -> {
-			writeLock.lock();
-			try {
-				for (IJavaProject project : projectFinder.all()) {
-					loadLookupEnvTuple(project);
-				}
-			} finally {
-				writeLock.unlock();
-			}
-		});
 
 		projectListener = new ProjectObserver.Listener() {
 			
 			@Override
 			public void deleted(IJavaProject project) {
 				logger.info("CU Cache: deleted project {}", project.getElementName());
-				async.execute(() -> {
-					writeLock.lock();
-					try {
+//				async.execute(() -> {
+//					writeLock.lock();
+//					try {
 						invalidateProject(project);
-					} finally {
-						writeLock.unlock();
-					}
-				});
+//					} finally {
+//						writeLock.unlock();
+//					}
+//				});
 			}
 			
 			@Override
 			public void created(IJavaProject project) {
 				logger.info("CU Cache: created project {}", project.getElementName());
-				async.execute(() -> {
-					writeLock.lock();
-					try {
+//				async.execute(() -> {
+//					writeLock.lock();
+//					try {
 						invalidateProject(project);
 						// Load the new cache the value right away
 						loadLookupEnvTuple(project);
-					} finally {
-						writeLock.unlock();
-					}
-				});
+//					} finally {
+//						writeLock.unlock();
+//					}
+//				});
 			}
 			
 			@Override
 			public void changed(IJavaProject project) {
 				logger.info("CU Cache: changed project {}", project.getElementName());
-				async.execute(() -> {
-					writeLock.lock();
-					try {
+//				async.execute(() -> {
+//					writeLock.lock();
+//					try {
 						invalidateProject(project);
 						// Load the new cache the value right away
 						loadLookupEnvTuple(project);
-					} finally {
-						writeLock.unlock();
-					}
-				});
+//					} finally {
+//						writeLock.unlock();
+//					}
+//				});
 			}
 		};
 
@@ -182,9 +176,10 @@ public final class CompilationUnitCache implements DocumentContentProvider {
 	}
 
 	public <T> T withCompilationUnit(IJavaProject project, URI uri, Function<CompilationUnit, T> requestor) {
+		logger.info("CU Cache: work item for doc {}", uri.toString());
+
 		if (project != null) {
 
-			readLock.lock();
 			CompilationUnit cu = null;
 
 			try {
@@ -193,20 +188,23 @@ public final class CompilationUnitCache implements DocumentContentProvider {
 					String utiStr = uri.toString();
 					String unitName = utiStr.substring(utiStr.lastIndexOf("/"));
 					CompilationUnit cUnit = parse2(fetchContent(uri).toCharArray(), utiStr, unitName, lookupEnvTuple.getT1(), lookupEnvTuple.getT2());
-					projectToDocs.get(project, () -> new HashSet<>()).add(uri);
+					
+					logger.info("CU Cache: created new AST for {}", uri.toString());
+
 					return cUnit;
 				});
+
 				if (cu != null) {
 					projectToDocs.get(project, () -> new HashSet<>()).add(uri);
 				}
+
 			} catch (Exception e) {
 				logger.error("", e);
-			} finally {
-				readLock.unlock();
 			}
 
 			if (cu != null) {
 				try {
+					logger.info("CU Cache: sync start on AST for {}", uri.toString());
 					synchronized (cu.getAST()) {
 						return requestor.apply(cu);
 					}
@@ -214,6 +212,9 @@ public final class CompilationUnitCache implements DocumentContentProvider {
 				catch (Exception e) {
 					logger.error("", e);
 				}
+				finally {
+					logger.info("CU Cache: sync end on AST for {}", uri.toString());
+				}
 			}
 		}
 
@@ -221,51 +222,6 @@ public final class CompilationUnitCache implements DocumentContentProvider {
 	}
 
 
-	private void invalidateCuForJavaFile(String uriStr) {
-		URI uri = URI.create(uriStr);
-		writeLock.lock();
-		try {
-			uriToCu.invalidate(uri);
-		} finally {
-			writeLock.unlock();
-		}
-	}
-
-//	public static CompilationUnit parse(TextDocument document, IJavaProject project) throws Exception {
-//		String[] classpathEntries = getClasspathEntries(project);
-//		String docURI = document.getUri();
-//		String unitName = docURI.substring(docURI.lastIndexOf("/"));
-//		char[] source = document.get(0, document.getLength()).toCharArray();
-//		return parse(source, docURI, unitName, classpathEntries);
-//	}
-//
-//	public CompilationUnit parse(String uri, char[] source, IJavaProject project) throws Exception {
-//		String[] classpathEntries = getClasspathEntries(project);
-//		String unitName = uri.substring(uri.lastIndexOf("/"));
-//		return parse(source, uri, unitName, classpathEntries);
-//	}
-//
-//	public static CompilationUnit parse(char[] source, String docURI, String unitName, String[] classpathEntries) throws Exception {
-//		ASTParser parser = ASTParser.newParser(AST.JLS11);
-//		Map<String, String> options = JavaCore.getOptions();
-//		JavaCore.setComplianceOptions(JavaCore.VERSION_11, options);
-//		parser.setCompilerOptions(options);
-//		parser.setKind(ASTParser.K_COMPILATION_UNIT);
-//		parser.setStatementsRecovery(true);
-//		parser.setBindingsRecovery(true);
-//		parser.setResolveBindings(true);
-//
-//		String[] sourceEntries = new String[] {};
-//		parser.setEnvironment(classpathEntries, sourceEntries, null, false);
-//
-//		parser.setUnitName(unitName);
-//		parser.setSource(source);
-//
-//		CompilationUnit cu = (CompilationUnit) parser.createAST(null);
-//
-//		return cu;
-//	}
-	
 	public static CompilationUnit parse2(char[] source, String docURI, String unitName, IJavaProject project) throws Exception {
 		List<Classpath> classpaths = createClasspath(getClasspathEntries(project));
 		return parse2(source, docURI, unitName, classpaths, null);
@@ -294,7 +250,7 @@ public final class CompilationUnitCache implements DocumentContentProvider {
 			needToResolveBindings = false;
 		}
 		
-		CompilationUnit cu = CUResolver.convert(unit, source, AST.JLS11, options, needToResolveBindings, DefaultWorkingCopyOwner.PRIMARY, flags);
+		CompilationUnit cu = CUResolver.convert(unit, source, AST.JLS14, options, needToResolveBindings, DefaultWorkingCopyOwner.PRIMARY, flags);
 
 		return cu;
 	}
@@ -331,7 +287,16 @@ public final class CompilationUnitCache implements DocumentContentProvider {
 		}
 	}
 
+	private void invalidateCuForJavaFile(String uriStr) {
+		logger.info("CU Cache: invalidate AST for {}", uriStr);
+
+		URI uri = URI.create(uriStr);
+		uriToCu.invalidate(uri);
+	}
+
 	private void invalidateProject(IJavaProject project) {
+		logger.info("CU Cache: invalidate project <{}>", project.getElementName());
+
 		Set<URI> docUris = projectToDocs.getIfPresent(project);
 		if (docUris != null) {
 			uriToCu.invalidateAll(docUris);
@@ -342,13 +307,13 @@ public final class CompilationUnitCache implements DocumentContentProvider {
 
 	@Override
 	public String fetchContent(URI uri) throws Exception {
-		if (documents != null) {
-			TextDocument document = documents.get(uri.toString());
+		if (documentService != null) {
+			TextDocument document = documentService.getLatestSnapshot(uri.toString());
 			if (document != null) {
-				return document.get(0, document.getLength());
+				return document.get();
 			}
 		}
 		return IOUtils.toString(uri);
-
 	}
+
 }

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/xml/hyperlinks/BeanRefHyperlinkProvider.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2019, 2020 Pivotal, Inc.
+ * Copyright (c) 2019, 2021 Pivotal, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -24,7 +24,6 @@ import org.springframework.ide.vscode.boot.java.handlers.EnhancedSymbolInformati
 import org.springframework.ide.vscode.boot.java.handlers.SymbolAddOnInformation;
 import org.springframework.ide.vscode.commons.java.IJavaProject;
 import org.springframework.ide.vscode.commons.languageserver.java.JavaProjectFinder;
-import org.springframework.ide.vscode.commons.languageserver.util.SimpleTextDocumentService;
 import org.springframework.ide.vscode.commons.util.text.TextDocument;
 
 /**
@@ -34,12 +33,10 @@ public class BeanRefHyperlinkProvider implements XMLHyperlinkProvider {
 	
 	private final JavaProjectFinder projectFinder;
 	private final SpringSymbolIndex symbolIndex;
-	private final SimpleTextDocumentService documents;
 
-	public BeanRefHyperlinkProvider(JavaProjectFinder projectFinder, SpringSymbolIndex symbolIndex, SimpleTextDocumentService documents) {
+	public BeanRefHyperlinkProvider(JavaProjectFinder projectFinder, SpringSymbolIndex symbolIndex) {
 		this.projectFinder = projectFinder;
 		this.symbolIndex = symbolIndex;
-		this.documents = documents;
 	}
 
 	@Override
@@ -47,11 +44,26 @@ public class BeanRefHyperlinkProvider implements XMLHyperlinkProvider {
 		Optional<IJavaProject> foundProject = this.projectFinder.find(doc.getId());
 		if (foundProject.isPresent()) {
 			final IJavaProject project = foundProject.get();
+			String projectLocation = project.getLocationUri() != null ? project.getLocationUri().toString() : "";
+			
+			// make sure the project and the symbol location share the same prefix "file:///"
+			// looks like project locations are containing a "file:/" only
+			if (!projectLocation.startsWith("file:///")) {
+				projectLocation = "file:///" + projectLocation.substring("file:/".length());
+			}
+			
+			// make sure that only exact project locations are matched
+			if (!projectLocation.endsWith("/")) {
+				projectLocation = projectLocation + "/";
+			}
+			
 			List<SymbolInformation> symbols = symbolIndex.getSymbols(data -> symbolsFilter(data, attributeAt.getValue())).collect(Collectors.toList());
 			if (!symbols.isEmpty()) {
 				for (SymbolInformation symbol : symbols) {
 					Location location = symbol.getLocation();
-					if (project == documents.get(location.getUri())) {
+					String uri = location.getUri();
+					
+					if (uri != null && uri.startsWith(projectLocation)) {
 						return location;
 					}
 				}
@@ -63,7 +75,7 @@ public class BeanRefHyperlinkProvider implements XMLHyperlinkProvider {
 	
 	private boolean symbolsFilter(EnhancedSymbolInformation data, String beanId) {
 		SymbolAddOnInformation[] additionalInformation = data.getAdditionalInformation();
-		if (additionalInformation != null) {
+		if (beanId != null && additionalInformation != null) {
 			for (SymbolAddOnInformation info : additionalInformation) {
 				if (info instanceof BeansSymbolAddOnInformation) {
 					return beanId.equals(((BeansSymbolAddOnInformation)info).getBeanID());

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/yaml/quickfix/AppYamlQuickfixes.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2019, 2020 Pivotal, Inc.
+ * Copyright (c) 2019, 2021 Pivotal, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -63,7 +63,8 @@ public class AppYamlQuickfixes {
 		DEPRECATED_PROPERTY = r.register("DEPRECATED_YAML_PROPERTY", (Object _params) -> {
 			DeprecatedPropertyData params = gson.fromJson((JsonElement)_params, DeprecatedPropertyData.class);
 			try {
-				TextDocument _doc = textDocumentService.getDocument(params.getUri());
+				TextDocument _doc = textDocumentService.getLatestSnapshot(params.getUri());
+
 				if (_doc != null) {
 					YamlDocument doc = new YamlDocument(_doc, structureProvider);
 					SNode root = doc.getStructure();

headless-services/spring-boot-language-server/src/test/java/org/springframework/ide/vscode/boot/java/value/test/ValueSpelExpressionValidationTest.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2020 Pivotal, Inc.
+ * Copyright (c) 2020, 2021 Pivotal, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -316,7 +316,7 @@ public class ValueSpelExpressionValidationTest {
 		server.getTextDocumentService().didOpen(openParams);
 		server.getAsync().waitForAll();
 		
-		TextDocument doc = server.getTextDocumentService().get(docUri);
+		TextDocument doc = server.getTextDocumentService().getLatestSnapshot(docUri);
 		
 		int position = content.indexOf(selectedAnnotation);
 		doc.replace(position, selectedAnnotation.length(), annotationStatementBeforeTest);

headless-services/spring-boot-language-server/src/test/java/org/springframework/ide/vscode/boot/java/value/test/XMLSpelExpressionValidationTest.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2020 Pivotal, Inc.
+ * Copyright (c) 2020, 2021 Pivotal, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -141,7 +141,7 @@ public class XMLSpelExpressionValidationTest {
 		server.getTextDocumentService().didOpen(openParams);
 		server.getAsync().waitForAll();
 		
-		TextDocument doc = server.getTextDocumentService().get(docUri);
+		TextDocument doc = server.getTextDocumentService().getLatestSnapshot(docUri);
 		
 		int position = content.indexOf(selectedAnnotation);
 		doc.replace(position, selectedAnnotation.length(), annotationStatementBeforeTest);