Initial commit

.gitignore

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+/.idea
+/target

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>de.steamwar</groupId>
+    <artifactId>AttachTool</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <file.encoding>UTF-8</file.encoding>
+        <maven.compiler.source>16</maven.compiler.source>
+        <maven.compiler.target>16</maven.compiler.target>
+    </properties>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <version>3.2.0</version>
+                <artifactId>maven-jar-plugin</artifactId>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <addClasspath>true</addClasspath>
+                            <mainClass>de.steamwar.AttachTool</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/main/java/de/steamwar/AttachTool.java

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+package de.steamwar;
+
+import com.sun.tools.attach.AttachNotSupportedException;
+import com.sun.tools.attach.VirtualMachine;
+import com.sun.tools.attach.VirtualMachineDescriptor;
+import com.sun.tools.attach.spi.AttachProvider;
+
+import java.io.IOException;
+import java.util.Properties;
+
+public class AttachTool {
+
+    public static void main(String[] args) {
+        if(args.length == 0) {
+            for(AttachProvider provider : AttachProvider.providers()) {
+                for(VirtualMachineDescriptor vmd : provider.listVirtualMachines()) {
+                    System.out.println(vmd.id() + " " + vmd.displayName());
+                }
+            }
+        }else if(args.length == 1) {
+            try {
+                VirtualMachine vm = VirtualMachine.attach(args[0]);
+
+                // start management agent
+                Properties props = new Properties();
+                props.put("com.sun.management.jmxremote.port", "1999");
+                props.put("com.sun.management.jmxremote.authenticate", "false");
+                props.put("com.sun.management.jmxremote.ssl", "false");
+                vm.startManagementAgent(props);
+
+                vm.detach();
+            } catch (AttachNotSupportedException | IOException e) {
+                e.printStackTrace();
+                return;
+            }
+
+        }
+    }
+}