jdwp v0.1.0

jdwp

Java Debug Wire Protocol

Install

$ npm i jdwp --save

Usage

launch the java project and connect to jvm

const { launcher } = require('jdwp')

const vm = await launcher.launch({
  mainClass: 'Test',
  vmArgs: [ '-Dfile.encoding=UTF-8', '-Xdebug', '-Xnoagent', '-Djava.compiler=NONE' ],
  classPaths: [ __dirname ],
});
vm.on('event', async ({ events }) => {
  console.log(events);
});
await vm.ready();
await vm.resume();

run the example demo

$ node example/index.js

Begin debug Test.java
-----------------------
1  public class Test {
2      public int plus(int a, int b) {
3      	int c = a + b;
4      	return c;
5      }
6
7      public static void main(String[] args) {
8      	Test test = new Test();
9      	int c = test.plus(1, 2);
10      	System.out.println(c);
11          System.out.println("Hello world");
12      }
13  }
14
-----------------------

suspend at breakpoint line:10
get local variable c = 3
set local variable c = 4
4
step => Test main() line:11 Test/Test.java
Hello world
step => Test main() line:12 Test/Test.java
step => java.lang.Thread exit() line:757 java/lang/Thread/Thread.java
step => java.lang.Thread exit() line:758 java/lang/Thread/Thread.java
step => java.lang.Thread exit() line:759 java/lang/Thread/Thread.java
step => java.lang.Thread exit() line:762 java/lang/Thread/Thread.java
step => java.lang.Thread exit() line:764 java/lang/Thread/Thread.java
step => java.lang.Thread exit() line:765 java/lang/Thread/Thread.java
step => java.lang.Thread exit() line:766 java/lang/Thread/Thread.java
step => java.lang.Thread exit() line:767 java/lang/Thread/Thread.java
step => java.lang.Thread exit() line:768 java/lang/Thread/Thread.java
step => java.lang.Thread exit() line:769 java/lang/Thread/Thread.java

Protocol

https://docs.oracle.com/javase/7/docs/platform/jpda/jdwp/jdwp-protocol.html

• VirtualMachine Command Set (1)
  • Version (1)
  • ClassesBySignature (2)
  • AllClasses (3)
  • AllThreads (4)
  • TopLevelThreadGroups (5)
  • Dispose (6)
  • IDSizes (7)
  • Suspend (8)
  • Resume (9)
  • Exit (10)
  • CreateString (11)
  • Capabilities (12)
  • ClassPaths (13)
  • DisposeObjects (14)
  • HoldEvents (15)
  • ReleaseEvents (16)
  • CapabilitiesNew (17)
  • RedefineClasses (18)
  • SetDefaultStratum (19)
  • AllClassesWithGeneric (20)
  • InstanceCounts (21)
• ReferenceType Command Set (2)
  • Signature (1)
  • ClassLoader (2)
  • Modifiers (3)
  • Fields (4)
  • Methods (5)
  • GetValues (6)
  • SourceFile (7)
  • NestedTypes (8)
  • Status (9)
  • Interfaces (10)
  • ClassObject (11)
  • SourceDebugExtension (12)
  • SignatureWithGeneric (13)
  • FieldsWithGeneric (14)
  • MethodsWithGeneric (15)
  • Instances (16)
  • ClassFileVersion (17)
  • ConstantPool (18)
• ClassType Command Set (3)
  • Superclass (1)
  • SetValues (2)
  • InvokeMethod (3)
  • NewInstance (4)
• ArrayType Command Set (4)
  • NewInstance (1)
• InterfaceType Command Set (5)
• Method Command Set (6)
  • LineTable (1)
  • VariableTable (2)
  • Bytecodes (3)
  • IsObsolete (4)
  • VariableTableWithGeneric (5)
• Field Command Set (8)
• ObjectReference Command Set (9)
  • ReferenceType (1)
  • GetValues (2)
  • SetValues (3)
  • MonitorInfo (5)
  • InvokeMethod (6)
  • DisableCollection (7)
  • EnableCollection (8)
  • IsCollected (9)
  • ReferringObjects (10)
• StringReference Command Set (10)
  • Value (1)
• ThreadReference Command Set (11)
  • Name (1)
  • Suspend (2)
  • Resume (3)
  • Status (4)
  • ThreadGroup (5)
  • Frames (6)
  • FrameCount (7)
  • OwnedMonitors (8)
  • CurrentContendedMonitor (9)
  • Stop (10)
  • Interrupt (11)
  • SuspendCount (12)
  • OwnedMonitorsStackDepthInfo (13)
  • ForceEarlyReturn (14)
• ThreadGroupReference Command Set (12)
  • Name (1)
  • Parent (2)
  • Children (3)
• ArrayReference Command Set (13)
  • Length (1)
  • GetValues (2)
  • SetValues (3)
• ClassLoaderReference Command Set (14)
  • VisibleClasses (1)
• EventRequest Command Set (15)
  • Set (1)
  • Clear (2)
  • ClearAllBreakpoints (3)
• StackFrame Command Set (16)
  • GetValues (1)
  • SetValues (2)
  • ThisObject (3)
  • PopFrames (4)
• ClassObjectReference Command Set (17)
  • ReflectedType (1)
• Event Command Set (64)
  • Composite (100)