The Java debug pane is not expanding the keys in a HashMap

Problem: HashMap nodes are unexpandable when a Map.Entry local variable exists (screenshot attached)

Sample code

package com.tech.maven;

import java.util.HashMap;
import java.util.Map;

public class Bug {
    public static void main(String[] args) {
        Map<String, String> m = new HashMap<>();
        m.put("employees", "500");
        m.put("department", "IT");

        // Put your breakpoint on the line below  ←←←←←
        System.out.println("breakpoint here");

        // After you stop here, look at "m" in VARIABLES or WATCH → m.entrySet()
        // You will see only one entry (or unexpandable nodes) if the bug is still present
    }
    
}

VScode & Extensions Environment

JavaSE 17 (Temurin)

Version: 1.106.3
Commit: bf9252a2fb45be6893dd8870c0bf37e2e1766d61
Date: 2025-11-25T22:28:18.024Z (3 days ago)
Electron: 37.7.0
ElectronBuildId: 12781156
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 24.5.0

{
message: "Use the JDK from 'java.jdt.ls.java.home' setting as the initial default project JDK.",
level: 'info',
timestamp: '2025-11-28 17:42:36.098'
}
{
message: 'Starting Java server with: /Library/Java/JavaVirtualMachines/temurin-25.jdk/Contents/Home/bin/java -Djdk.xml.maxGeneralEntitySizeLimit=0 -Djdk.xml.totalEntitySizeLimit=0 --add-modules=ALL-SYSTEM --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/sun.nio.fs=ALL-UNNAMED -Declipse.application=org.eclipse.jdt.ls.core.id1 -Dosgi.bundles.defaultStartLevel=4 -Declipse.product=org.eclipse.jdt.ls.core.product -Djava.import.generatesMetadataFilesAtProjectRoot=false -DDetectVMInstallationsJob.disabled=true -Dfile.encoding=utf8 -XX:+UseParallelGC -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Dsun.zip.disableMemoryMapping=true -Xmx2G -Xms100m -Xlog:disable -javaagent:/Users/apoorvgupta/.vscode/extensions/redhat.java-1.50.0-darwin-arm64/lombok/lombok-1.18.39-4050.jar -jar /Users/apoorvgupta/.vscode/extensions/redhat.java-1.50.0-darwin-arm64/server/plugins/org.eclipse.equinox.launcher_1.7.100.v20251111-0406.jar -configuration /Users/apoorvgupta/Library/Application Support/Code/User/globalStorage/redhat.java/1.50.0/config_ss_mac -data /Users/apoorvgupta/Library/Application Support/Code/User/workspaceStorage/165590fa5fdbeda64cc12900062709b0/redhat.java/ss_ws',
level: 'info',
timestamp: '2025-11-28 17:42:36.104'
}
{
message: 'WARNING: Using incubator modules: jdk.incubator.vector\n',
level: 'info',
timestamp: '2025-11-28 17:42:36.168'
}
{
message: 'Starting Java server with: /Library/Java/JavaVirtualMachines/temurin-25.jdk/Contents/Home/bin/java -Djdk.xml.maxGeneralEntitySizeLimit=0 -Djdk.xml.totalEntitySizeLimit=0 --add-modules=ALL-SYSTEM --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/sun.nio.fs=ALL-UNNAMED -Declipse.application=org.eclipse.jdt.ls.core.id1 -Dosgi.bundles.defaultStartLevel=4 -Declipse.product=org.eclipse.jdt.ls.core.product -Djava.import.generatesMetadataFilesAtProjectRoot=false -DDetectVMInstallationsJob.disabled=true -Dfile.encoding=utf8 -XX:+UseParallelGC -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Dsun.zip.disableMemoryMapping=true -Xmx2G -Xms100m -Xlog:disable -javaagent:/Users/apoorvgupta/.vscode/extensions/redhat.java-1.50.0-darwin-arm64/lombok/lombok-1.18.39-4050.jar -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/Users/apoorvgupta/Library/Application Support/Code/User/workspaceStorage/165590fa5fdbeda64cc12900062709b0/redhat.java -Daether.dependencyCollector.impl=bf -jar /Users/apoorvgupta/.vscode/extensions/redhat.java-1.50.0-darwin-arm64/server/plugins/org.eclipse.equinox.launcher_1.7.100.v20251111-0406.jar -configuration /Users/apoorvgupta/Library/Application Support/Code/User/globalStorage/redhat.java/1.50.0/config_mac -data /Users/apoorvgupta/Library/Application Support/Code/User/workspaceStorage/165590fa5fdbeda64cc12900062709b0/redhat.java/jdt_ws',
level: 'info',
timestamp: '2025-11-28 17:42:36.184'
}
{
message: 'WARNING: Using incubator modules: jdk.incubator.vector\n',
level: 'info',
timestamp: '2025-11-28 17:42:36.215'
}
{
message: 'An error has occurred. See the log file\n' +
'/Users/apoorvgupta/Library/Application Support/Code/User/globalStorage/redhat.java/1.50.0/config_ss_mac/1764369756291.log.\n',
level: 'info',
timestamp: '2025-11-28 17:42:36.549'
}
{
message: 'Nov 28, 2025 5:42:36 PM org.apache.aries.spifly.BaseActivator log\n' +
'INFO: Registered provider ch.qos.logback.classic.spi.LogbackServiceProvider of service org.slf4j.spi.SLF4JServiceProvider in bundle ch.qos.logback.classic\n',
level: 'info',
timestamp: '2025-11-28 17:42:36.642'
}
{
message: 'WARNING: A terminally deprecated method in sun.misc.Unsafe has been called\n' +
'WARNING: sun.misc.Unsafe::staticFieldBase has been called by com.google.inject.internal.aop.HiddenClassDefiner (file:/Users/apoorvgupta/Library/Application Support/Code/User/globalStorage/redhat.java/1.50.0/config_mac/org.eclipse.osgi/69/0/.cp/jars/guice-5.1.0-classes.jar)\n' +
'WARNING: Please consider reporting this to the maintainers of class com.google.inject.internal.aop.HiddenClassDefiner\n' +
'WARNING: sun.misc.Unsafe::staticFieldBase will be removed in a future release\n',
level: 'info',
timestamp: '2025-11-28 17:42:37.400'
}
{
message: 'Nov 28, 2025 5:42:39 PM com.microsoft.java.debug.plugin.internal.JavaDebuggerServerPlugin start\n' +
'INFO: Starting com.microsoft.java.debug.plugin\n',
level: 'info',
timestamp: '2025-11-28 17:42:39.985'
}
{
message: 'Nov 28, 2025 5:42:44 PM com.microsoft.java.debug.core.UsageDataSession recordInfo\n' +
'INFO: launch debug info\n',
level: 'info',
timestamp: '2025-11-28 17:42:44.149'
}
{
message: 'Nov 28, 2025 5:42:49 PM com.microsoft.java.debug.core.UsageDataSession recordResponse\n' +
'WARNING: abnormal response\n',
level: 'info',
timestamp: '2025-11-28 17:42:49.363'
}
{
message: 'Nov 28, 2025 5:42:56 PM com.microsoft.java.debug.core.UsageDataSession recordResponse\n' +
'WARNING: abnormal response\n',
level: 'info',
timestamp: '2025-11-28 17:42:56.376'
}
{
message: 'Nov 28, 2025 5:45:18 PM com.microsoft.java.debug.core.UsageDataSession submitUsageData\n' +
'INFO: session usage data summary\n',
level: 'info',
timestamp: '2025-11-28 17:45:18.373'
}
{
message: "Use the JDK from 'java.jdt.ls.java.home' setting as the initial default project JDK.",
level: 'info',
timestamp: '2025-11-28 17:45:50.541'
}
{
message: 'Starting Java server with: /Library/Java/JavaVirtualMachines/temurin-25.jdk/Contents/Home/bin/java -Djdk.xml.maxGeneralEntitySizeLimit=0 -Djdk.xml.totalEntitySizeLimit=0 --add-modules=ALL-SYSTEM --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/sun.nio.fs=ALL-UNNAMED -Declipse.application=org.eclipse.jdt.ls.core.id1 -Dosgi.bundles.defaultStartLevel=4 -Declipse.product=org.eclipse.jdt.ls.core.product -Djava.import.generatesMetadataFilesAtProjectRoot=false -DDetectVMInstallationsJob.disabled=true -Dfile.encoding=utf8 -XX:+UseParallelGC -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Dsun.zip.disableMemoryMapping=true -Xmx2G -Xms100m -Xlog:disable -javaagent:/Users/apoorvgupta/.vscode/extensions/redhat.java-1.50.0-darwin-arm64/lombok/lombok-1.18.39-4050.jar -jar /Users/apoorvgupta/.vscode/extensions/redhat.java-1.50.0-darwin-arm64/server/plugins/org.eclipse.equinox.launcher_1.7.100.v20251111-0406.jar -configuration /Users/apoorvgupta/Library/Application Support/Code/User/globalStorage/redhat.java/1.50.0/config_ss_mac -data /Users/apoorvgupta/Library/Application Support/Code/User/workspaceStorage/165590fa5fdbeda64cc12900062709b0/redhat.java/ss_ws',
level: 'info',
timestamp: '2025-11-28 17:45:50.546'
}
{
message: 'WARNING: Using incubator modules: jdk.incubator.vector\n',
level: 'info',
timestamp: '2025-11-28 17:45:50.601'
}
{
message: 'Starting Java server with: /Library/Java/JavaVirtualMachines/temurin-25.jdk/Contents/Home/bin/java -Djdk.xml.maxGeneralEntitySizeLimit=0 -Djdk.xml.totalEntitySizeLimit=0 --add-modules=ALL-SYSTEM --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/sun.nio.fs=ALL-UNNAMED -Declipse.application=org.eclipse.jdt.ls.core.id1 -Dosgi.bundles.defaultStartLevel=4 -Declipse.product=org.eclipse.jdt.ls.core.product -Djava.import.generatesMetadataFilesAtProjectRoot=false -DDetectVMInstallationsJob.disabled=true -Dfile.encoding=utf8 -XX:+UseParallelGC -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Dsun.zip.disableMemoryMapping=true -Xmx2G -Xms100m -Xlog:disable -javaagent:/Users/apoorvgupta/.vscode/extensions/redhat.java-1.50.0-darwin-arm64/lombok/lombok-1.18.39-4050.jar -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/Users/apoorvgupta/Library/Application Support/Code/User/workspaceStorage/165590fa5fdbeda64cc12900062709b0/redhat.java -Daether.dependencyCollector.impl=bf -jar /Users/apoorvgupta/.vscode/extensions/redhat.java-1.50.0-darwin-arm64/server/plugins/org.eclipse.equinox.launcher_1.7.100.v20251111-0406.jar -configuration /Users/apoorvgupta/Library/Application Support/Code/User/globalStorage/redhat.java/1.50.0/config_mac -data /Users/apoorvgupta/Library/Application Support/Code/User/workspaceStorage/165590fa5fdbeda64cc12900062709b0/redhat.java/jdt_ws',
level: 'info',
timestamp: '2025-11-28 17:45:50.604'
}
{
message: 'WARNING: Using incubator modules: jdk.incubator.vector\n',
level: 'info',
timestamp: '2025-11-28 17:45:50.634'
}
{
message: 'Nov 28, 2025 5:45:50 PM org.apache.aries.spifly.BaseActivator log\n' +
'INFO: Registered provider ch.qos.logback.classic.spi.LogbackServiceProvider of service org.slf4j.spi.SLF4JServiceProvider in bundle ch.qos.logback.classic\n',
level: 'info',
timestamp: '2025-11-28 17:45:50.916'
}
{
message: 'WARNING: A terminally deprecated method in sun.misc.Unsafe has been called\n' +
'WARNING: sun.misc.Unsafe::objectFieldOffset has been called by lombok.permit.Permit\n' +
'WARNING: Please consider reporting this to the maintainers of class lombok.permit.Permit\n' +
'WARNING: sun.misc.Unsafe::objectFieldOffset will be removed in a future release\n',
level: 'info',
timestamp: '2025-11-28 17:45:51.738'
}
{
message: 'WARNING: A terminally deprecated method in sun.misc.Unsafe has been called\n' +
'WARNING: sun.misc.Unsafe::staticFieldBase has been called by com.google.inject.internal.aop.HiddenClassDefiner (file:/Users/apoorvgupta/Library/Application Support/Code/User/globalStorage/redhat.java/1.50.0/config_mac/org.eclipse.osgi/69/0/.cp/jars/guice-5.1.0-classes.jar)\n' +
'WARNING: Please consider reporting this to the maintainers of class com.google.inject.internal.aop.HiddenClassDefiner\n' +
'WARNING: sun.misc.Unsafe::staticFieldBase will be removed in a future release\n',
level: 'info',
timestamp: '2025-11-28 17:45:51.766'
}
{
message: 'Nov 28, 2025 5:45:52 PM com.microsoft.java.debug.plugin.internal.JavaDebuggerServerPlugin start\n' +
'INFO: Starting com.microsoft.java.debug.plugin\n',
level: 'info',
timestamp: '2025-11-28 17:45:52.628'
}
{
message: 'Nov 28, 2025 5:46:03 PM com.microsoft.java.debug.core.UsageDataSession recordInfo\n' +
'INFO: launch debug info\n',
level: 'info',
timestamp: '2025-11-28 17:46:03.267'
}
{
message: 'Nov 28, 2025 5:46:08 PM com.microsoft.java.debug.core.UsageDataSession recordResponse\n' +
'WARNING: abnormal response\n',
level: 'info',
timestamp: '2025-11-28 17:46:08.487'
}
{
message: "Use the JDK from 'java.jdt.ls.java.home' setting as the initial default project JDK.",
level: 'info',
timestamp: '2025-11-28 17:48:27.353'
}
{
message: 'Starting Java server with: /Library/Java/JavaVirtualMachines/temurin-25.jdk/Contents/Home/bin/java -Djdk.xml.maxGeneralEntitySizeLimit=0 -Djdk.xml.totalEntitySizeLimit=0 --add-modules=ALL-SYSTEM --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/sun.nio.fs=ALL-UNNAMED -Declipse.application=org.eclipse.jdt.ls.core.id1 -Dosgi.bundles.defaultStartLevel=4 -Declipse.product=org.eclipse.jdt.ls.core.product -Djava.import.generatesMetadataFilesAtProjectRoot=false -DDetectVMInstallationsJob.disabled=true -Dfile.encoding=utf8 -XX:+UseParallelGC -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Dsun.zip.disableMemoryMapping=true -Xmx2G -Xms100m -Xlog:disable -javaagent:/Users/apoorvgupta/.vscode/extensions/redhat.java-1.50.0-darwin-arm64/lombok/lombok-1.18.39-4050.jar -jar /Users/apoorvgupta/.vscode/extensions/redhat.java-1.50.0-darwin-arm64/server/plugins/org.eclipse.equinox.launcher_1.7.100.v20251111-0406.jar -configuration /Users/apoorvgupta/Library/Application Support/Code/User/globalStorage/redhat.java/1.50.0/config_ss_mac -data /Users/apoorvgupta/Library/Application Support/Code/User/workspaceStorage/165590fa5fdbeda64cc12900062709b0/redhat.java/ss_ws',
level: 'info',
timestamp: '2025-11-28 17:48:27.358'
}
{
message: 'WARNING: Using incubator modules: jdk.incubator.vector\n',
level: 'info',
timestamp: '2025-11-28 17:48:27.404'
}
{
message: 'Starting Java server with: /Library/Java/JavaVirtualMachines/temurin-25.jdk/Contents/Home/bin/java -Djdk.xml.maxGeneralEntitySizeLimit=0 -Djdk.xml.totalEntitySizeLimit=0 --add-modules=ALL-SYSTEM --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/sun.nio.fs=ALL-UNNAMED -Declipse.application=org.eclipse.jdt.ls.core.id1 -Dosgi.bundles.defaultStartLevel=4 -Declipse.product=org.eclipse.jdt.ls.core.product -Djava.import.generatesMetadataFilesAtProjectRoot=false -DDetectVMInstallationsJob.disabled=true -Dfile.encoding=utf8 -XX:+UseParallelGC -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Dsun.zip.disableMemoryMapping=true -Xmx2G -Xms100m -Xlog:disable -javaagent:/Users/apoorvgupta/.vscode/extensions/redhat.java-1.50.0-darwin-arm64/lombok/lombok-1.18.39-4050.jar -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/Users/apoorvgupta/Library/Application Support/Code/User/workspaceStorage/165590fa5fdbeda64cc12900062709b0/redhat.java -Daether.dependencyCollector.impl=bf -jar /Users/apoorvgupta/.vscode/extensions/redhat.java-1.50.0-darwin-arm64/server/plugins/org.eclipse.equinox.launcher_1.7.100.v20251111-0406.jar -configuration /Users/apoorvgupta/Library/Application Support/Code/User/globalStorage/redhat.java/1.50.0/config_mac -data /Users/apoorvgupta/Library/Application Support/Code/User/workspaceStorage/165590fa5fdbeda64cc12900062709b0/redhat.java/jdt_ws',
level: 'info',
timestamp: '2025-11-28 17:48:27.420'
}
{
message: 'WARNING: Using incubator modules: jdk.incubator.vector\n',
level: 'info',
timestamp: '2025-11-28 17:48:27.450'
}
{
message: 'Nov 28, 2025 5:48:27 PM org.apache.aries.spifly.BaseActivator log\n' +
'INFO: Registered provider ch.qos.logback.classic.spi.LogbackServiceProvider of service org.slf4j.spi.SLF4JServiceProvider in bundle ch.qos.logback.classic\n',
level: 'info',
timestamp: '2025-11-28 17:48:27.735'
}
{
message: 'WARNING: A terminally deprecated method in sun.misc.Unsafe has been called\n' +
'WARNING: sun.misc.Unsafe::objectFieldOffset has been called by lombok.permit.Permit\n' +
'WARNING: Please consider reporting this to the maintainers of class lombok.permit.Permit\n' +
'WARNING: sun.misc.Unsafe::objectFieldOffset will be removed in a future release\n',
level: 'info',
timestamp: '2025-11-28 17:48:28.319'
}
{
message: 'WARNING: A terminally deprecated method in sun.misc.Unsafe has been called\n' +
'WARNING: sun.misc.Unsafe::staticFieldBase has been called by com.google.inject.internal.aop.HiddenClassDefiner (file:/Users/apoorvgupta/Library/Application Support/Code/User/globalStorage/redhat.java/1.50.0/config_mac/org.eclipse.osgi/69/0/.cp/jars/guice-5.1.0-classes.jar)\n' +
'WARNING: Please consider reporting this to the maintainers of class com.google.inject.internal.aop.HiddenClassDefiner\n' +
'WARNING: sun.misc.Unsafe::staticFieldBase will be removed in a future release\n',
level: 'info',
timestamp: '2025-11-28 17:48:28.554'
}
{
message: 'Nov 28, 2025 5:48:29 PM com.microsoft.java.debug.plugin.internal.JavaDebuggerServerPlugin start\n' +
'INFO: Starting com.microsoft.java.debug.plugin\n',
level: 'info',
timestamp: '2025-11-28 17:48:29.539'
}
{
message: 'Nov 28, 2025 5:48:46 PM com.microsoft.java.debug.core.UsageDataSession recordInfo\n' +
'INFO: launch debug info\n',
level: 'info',
timestamp: '2025-11-28 17:48:46.326'
}
{
message: 'Nov 28, 2025 5:48:51 PM com.microsoft.java.debug.core.UsageDataSession recordResponse\n' +
'WARNING: abnormal response\n',
level: 'info',
timestamp: '2025-11-28 17:48:51.548'
}
{
message: 'Nov 28, 2025 5:53:46 PM com.microsoft.java.debug.core.UsageDataSession submitUsageData\n' +
'INFO: session usage data summary\n',
level: 'info',
timestamp: '2025-11-28 17:53:46.401'
}
{
message: 'Nov 28, 2025 5:53:53 PM com.microsoft.java.debug.core.UsageDataSession recordInfo\n' +
'INFO: launch debug info\n',
level: 'info',
timestamp: '2025-11-28 17:53:53.266'
}
{
message: 'Nov 28, 2025 5:53:53 PM com.microsoft.java.debug.core.UsageDataSession recordResponse\n' +
'WARNING: abnormal response\n',
level: 'info',
timestamp: '2025-11-28 17:53:53.538'
}
{
message: 'Nov 28, 2025 5:55:37 PM com.microsoft.java.debug.core.UsageDataSession recordResponse\n' +
'WARNING: abnormal response\n',
level: 'info',
timestamp: '2025-11-28 17:55:37.868'
}
{
message: 'Nov 28, 2025 5:55:39 PM com.microsoft.java.debug.core.UsageDataSession recordResponse\n' +
'WARNING: abnormal response\n',
level: 'info',
timestamp: '2025-11-28 17:55:39.318'
}
{
message: 'Nov 28, 2025 5:55:41 PM com.microsoft.java.debug.core.UsageDataSession recordResponse\n' +
'WARNING: abnormal response\n',
level: 'info',
timestamp: '2025-11-28 17:55:41.167'
}
{
message: 'Nov 28, 2025 5:56:03 PM com.microsoft.java.debug.core.UsageDataSession submitUsageData\n' +
'INFO: session usage data summary\n',
level: 'info',
timestamp: '2025-11-28 17:56:03.623'
}
{
message: 'Nov 28, 2025 5:56:03 PM com.microsoft.java.debug.core.UsageDataSession recordInfo\n' +
'INFO: launch debug info\n',
level: 'info',
timestamp: '2025-11-28 17:56:03.947'
}
{
message: 'Nov 28, 2025 5:56:04 PM com.microsoft.java.debug.core.UsageDataSession recordResponse\n' +
'WARNING: abnormal response\n',
level: 'info',
timestamp: '2025-11-28 17:56:04.218'
}

Commencez par le point d’entrée d’exemple Bug.main, arrêtez-vous au point d’arrêt indiqué et inspectez m dans VARIABLES ou m.entrySet() dans WATCH avec la configuration Java et VS Code signalée. L’issue est terminée lorsque les nœuds HashMap se déploient et que toutes les entrées sont visibles même lorsqu’une variable locale de type Map.Entry existe.