Fix launch.json behavior and hanging issue with multiple main classes

README.md

@@ -200,15 +200,7 @@ The extension will analyze the content of the opened workspace, and relevant oth
     1. Check the `pom.xml` file for any duplicated tags.
     2. If duplicated tags are found, remove the extra tags and attempt to compile again.
     3. Add the `--enable-preview` VM argument to the *exec-maven-plugin* or *maven-surefile-plugin* configurations if they are used execution or test runs.
-2. If the "*Launch Java App*" configuration is being used to *Run and Debug* an application, the following issues may occur if no `mainClass` field value is defined.
-    - Issues:
-        1. If more than 2 main classes are present in the project, then using the *Run and Debug* button does not launch execution and appears as stuck prior to run.
-        2. If the editor window open is a file that is not within the src root of the maven/gradle project, then using the *Run and Debug* button launches the projects tests.
-    - Resolution or Workaround:
-        1. Open the `launch.json` file.
-        2. Edit the configuration for the "*Launch Java App*", i.e. the one which has `"type": "jdk"` and `"request": "launch"`.
-        3. Define a value for the *mainClass* field, i.e. `"mainClass": "<main class fully-qualified-name or file-path>"`.
-3. The *Project: Test Project* command executes the project's tests but does not update the Testing or the Tests Results panels. The test output is present only in the Terminal or Debug Console panel.
+2. The *Project: Test Project* command executes the project's tests but does not update the Testing or the Tests Results panels. The test output is present only in the Terminal or Debug Console panel.
 
 ## Telemetry
 

build.xml

@@ -51,6 +51,7 @@
             patches/8038-draft.diff
             patches/8690.diff
             patches/8829.diff
+            patches/8828.diff
             patches/7893-draft.diff
             patches/8460-draft.diff
             patches/8745-draft.diff

patches/8828.diff

@@ -0,0 +1,47 @@
+diff --git a/java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/debugging/launch/NbLaunchDelegate.java b/java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/debugging/launch/NbLaunchDelegate.java
+index a8ca4f2143de..e503da42bd4b 100644
+--- a/java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/debugging/launch/NbLaunchDelegate.java
++++ b/java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/debugging/launch/NbLaunchDelegate.java
+@@ -571,7 +571,7 @@ public void finished(boolean success) {
+             mainSource = false;
+         } else {
+             FileObject fileRoot = sourceCP != null ? sourceCP.findOwnerRoot(toRun) : null;
+-            mainSource = fileRoot != null && UnitTestForSourceQuery.findUnitTests(fileRoot).length > 0;
++            mainSource = fileRoot == null || UnitTestForSourceQuery.findSources(fileRoot).length == 0;
+         }
+         ActionProvider provider = null;
+         String command = null;
+diff --git a/java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/debugging/launch/NbLaunchRequestHandler.java b/java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/debugging/launch/NbLaunchRequestHandler.java
+index b1a472ce99a4..5e6242c6e89d 100644
+--- a/java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/debugging/launch/NbLaunchRequestHandler.java
++++ b/java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/debugging/launch/NbLaunchRequestHandler.java
+@@ -32,6 +32,8 @@
+ import java.util.concurrent.CompletableFuture;
+ import java.util.concurrent.atomic.AtomicReference;
+ import java.util.function.Consumer;
++import java.util.logging.Level;
++import java.util.logging.Logger;
+ import java.util.regex.Matcher;
+ import java.util.regex.Pattern;
+ import java.util.stream.Collectors;
+@@ -70,7 +72,7 @@
+  * @author martin
+  */
+ public final class NbLaunchRequestHandler {
+-
++    private static final Logger LOG = Logger.getLogger(NbLaunchRequestHandler.class.getName());
+     private NbLaunchDelegate activeLaunchHandler;
+
+     public CompletableFuture<Void> launch(Map<String, Object> launchArguments, DebugAdapterContext context) {
+@@ -148,7 +150,10 @@ public CompletableFuture<Void> launch(Map<String, Object> launchArguments, Debug
+                         case 1:
+                             handleSelectedMainClass.accept(mainClasses.get(0));
+                             break;
+-                        case 2:
++                        default:
++                            if(mainClasses.size() > 10){
++                                LOG.log(Level.WARNING, "The number of main classes is large :{0}", mainClasses.size());
++                            }
+                             List<NotifyDescriptor.QuickPick.Item> mainClassItems =
+                                     mainClasses.stream()
+                                                .map(eh -> new Item(eh.getQualifiedName(), eh.getQualifiedName()))