Logpoints can't be evaluated

まず、JdtEvaluationProvider.evaluateForBreakpoint と、スタックトレースに示されている SetBreakpointsRequestHandler の経路を追跡します。sun.awt.X11.XDragSourcePeer 上で logpoint を再現し、評価時に sun.awt.X11.XMotionEvent を解決できないと報告される理由を調査します。同じ logpoint がコンパイルエラーなしでメッセージを出力すれば完了です。

When adding logpoints to sun.awt.X11.XDragSourcePeer, I often get errors.

Environment

• Operating System: Ubuntu 22.04.4 LTS
• JDK version: OpenJDK Runtime Environment Temurin-17.0.11+9 (build 17.0.11+9)
• Visual Studio Code version: 1.91.1
• Java extension version: v1.32.0
• Java Debugger extension version: v0.58.0

Steps To Reproduce

1. Use attached source file
2. Extract jdk src.zip and add to classpath (I forget how I did this)
3. Open "Java Projects" > java.desktop > sun.awt.X11 > XDragSourceContextPeer, add "Hello world" logpoint to line 483 (which is doUpdateTargetWindow(subwindow, time);.
4. Get error [Logpoint] Log message 'Hello world' error: Cannot evaluate because of compilation error(s): Evaluations must contain either an expression or block of well-formed statements
5. Observe > [Warn - 3:19:18 PM] Jul 23, 2024, 3:19:18 PM Compile error during code evaluation: sun.awt.X11.XMotionEvent cannot be resolved to a type in the Language Support for Java log.

Sample program:

import javax.swing.*;
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.awt.event.*;
import java.util.logging.ConsoleHandler;

import java.util.logging.Level;
import java.util.logging.Logger;

public class DragAndDropExample extends JFrame {

    public DragAndDropExample() {
        setTitle("Drag and Drop Example");
        setSize(400, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);

        JTextArea sourceTextArea = new JTextArea("Drag this text");
        sourceTextArea.setDragEnabled(true);
        sourceTextArea.setLineWrap(true);
        sourceTextArea.setWrapStyleWord(true);
        JScrollPane sourceScrollPane = new JScrollPane(sourceTextArea);

        JTextArea targetTextArea = new JTextArea("Drop here");
        targetTextArea.setLineWrap(true);
        targetTextArea.setWrapStyleWord(true);
        JScrollPane targetScrollPane = new JScrollPane(targetTextArea);

        new DropTarget(targetTextArea, new DropTargetListener() {
            @Override
            public void dragEnter(DropTargetDragEvent dtde) {
                if (dtde.isDataFlavorSupported(DataFlavor.stringFlavor)) {
                    dtde.acceptDrag(DnDConstants.ACTION_COPY);
                    System.out.println("Drag Enter: Data flavor supported");
                } else {
                    dtde.rejectDrag();
                    System.out.println("Drag Enter: Data flavor not supported");
                }
            }

            @Override
            public void dragOver(DropTargetDragEvent dtde) {
                // No action needed here
            }

            @Override
            public void dropActionChanged(DropTargetDragEvent dtde) {
                // No action needed here
            }

            @Override
            public void dragExit(DropTargetEvent dte) {
                System.out.println("Drag Exit");
            }

            @Override
            public void drop(DropTargetDropEvent dtde) {
                try {
                    if (dtde.isDataFlavorSupported(DataFlavor.stringFlavor)) {
                        dtde.acceptDrop(DnDConstants.ACTION_COPY);
                        String droppedText = (String) dtde.getTransferable().getTransferData(DataFlavor.stringFlavor);
                        targetTextArea.append(droppedText);
                        dtde.dropComplete(true);
                        System.out.println("Drop: Success");
                    } else {
                        dtde.rejectDrop();
                        System.out.println("Drop: Data flavor not supported");
                    }
                } catch (Exception ex) {
                    ex.printStackTrace();
                    dtde.dropComplete(false);
                    System.out.println("Drop: Exception occurred");
                }
            }
        });

        setLayout(new GridLayout(2, 1));
        add(sourceScrollPane);
        add(targetScrollPane);
    }

    public static void main(String[] args) {

        Logger platformLogger = Logger.getLogger("sun.awt.X11.xembed.xdnd.XDnDDropSourceProtocol");
        platformLogger.setLevel(Level.ALL);
        
        ConsoleHandler consoleHandler = new ConsoleHandler();
        consoleHandler.setLevel(Level.ALL);
        platformLogger.addHandler(consoleHandler);

        SwingUtilities.invokeLater(() -> {
            new DragAndDropExample().setVisible(true);
        });
    }
}

Language support for Java logs:

Jul 23, 2024 3:18:58 PM org.apache.aries.spifly.BaseActivator log
INFO: Registered provider ch.qos.logback.classic.servlet.LogbackServletContainerInitializer of service jakarta.servlet.ServletContainerInitializer in bundle ch.qos.logback.classic
Jul 23, 2024 3:18:58 PM org.apache.aries.spifly.BaseActivator log
INFO: Registered provider ch.qos.logback.classic.spi.LogbackServiceProvider of service org.slf4j.spi.SLF4JServiceProvider in bundle ch.qos.logback.classic
Jul 23, 2024 3:19:01 PM com.microsoft.java.debug.plugin.internal.JavaDebuggerServerPlugin start
INFO: Starting com.microsoft.java.debug.plugin
Jul 23, 2024 3:19:13 PM com.microsoft.java.debug.core.UsageDataSession recordInfo
INFO: launch debug info
Jul 23, 2024 3:19:14 PM com.microsoft.java.debug.core.UsageDataSession recordResponse
WARNING: abnormal response
[Warn  - 3:19:18 PM] Jul 23, 2024, 3:19:18 PM Compile error during code evaluation: sun.awt.X11.XMotionEvent cannot be resolved to a type
[Error - 3:19:18 PM] Jul 23, 2024, 3:19:18 PM [Logpoint]: Cannot evaluate because of compilation error(s): Evaluations must contain either an expression or a block of well-formed statements.
Cannot evaluate because of compilation error(s): Evaluations must contain either an expression or a block of well-formed statements.
com.microsoft.java.debug.core.DebugException: Cannot evaluate because of compilation error(s): Evaluations must contain either an expression or a block of well-formed statements.
	at com.microsoft.java.debug.core.adapter.AdapterUtils.createUserErrorDebugException(AdapterUtils.java:274)
	at com.microsoft.java.debug.plugin.internal.eval.JdtEvaluationProvider.evaluate(JdtEvaluationProvider.java:176)
	at com.microsoft.java.debug.plugin.internal.eval.JdtEvaluationProvider.evaluateForBreakpoint(JdtEvaluationProvider.java:108)
	at com.microsoft.java.debug.core.adapter.handler.SetBreakpointsRequestHandler.lambda$registerBreakpointHandler$7(SetBreakpointsRequestHandler.java:206)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.exec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool.scan(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)

Jul 23, 2024 3:19:18 PM com.microsoft.java.debug.core.adapter.handler.SetBreakpointsRequestHandler handleEvaluationResult
SEVERE: [Logpoint]: Cannot evaluate because of compilation error(s): Evaluations must contain either an expression or a block of well-formed statements.
com.microsoft.java.debug.core.DebugException: Cannot evaluate because of compilation error(s): Evaluations must contain either an expression or a block of well-formed statements.
	at com.microsoft.java.debug.core.adapter.AdapterUtils.createUserErrorDebugException(AdapterUtils.java:274)
	at com.microsoft.java.debug.plugin.internal.eval.JdtEvaluationProvider.evaluate(JdtEvaluationProvider.java:176)
	at com.microsoft.java.debug.plugin.internal.eval.JdtEvaluationProvider.evaluateForBreakpoint(JdtEvaluationProvider.java:108)
	at com.microsoft.java.debug.core.adapter.handler.SetBreakpointsRequestHandler.lambda$registerBreakpointHandler$7(SetBreakpointsRequestHandler.java:206)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.exec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool.scan(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)

Current Result

Error message is shown instead of log messages.

Expected Result

Log messages are logged.

Additional Informations

This seems to be the relevant error:

[Warn - 3:19:18 PM] Jul 23, 2024, 3:19:18 PM Compile error during code evaluation: sun.awt.X11.XMotionEvent cannot be resolved to a type