Audit Java: system to detect exceptions thrown / caught (aop?)

Question

Due to checked exceptions, we can have some problems in production having all exceptions caught in the right place and logged correctly.

I wonder if there is some openso

Answer 1

I didn't though about that yet but one solution, if you do not need to detect exceptions thrown on production envirionment, is to attach to your Java application a custom debugger that can be triggered whenever an exception is raised.

This french blog article talk about how to do it: http://blog.xebia.fr/2011/12/12/legacy-code-gestion-des-exceptions-avec-jpda/

Here is the code:

Run with debug: Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n

Connect to the JVM:

public static VirtualMachine connect(String port) throws IOException, IllegalConnectorArgumentsException {
        AttachingConnector connector = null;
        VirtualMachineManager vmManager = Bootstrap.virtualMachineManager();
        for (Connector aconnector : vmManager.allConnectors()) {
            if ("com.sun.jdi.SocketAttach".equals(aconnector.name())) {
  connector = (AttachingConnector) aconnector;
  break;
     }
 }
 Map args = connector.defaultArguments();
        Connector.Argument pidArgument = args.get("port");
        pidArgument.setValue(port);
        return connector.attach(args);
 }

Create your breakpoints. Exemple:

public static void createExceptionBreakPoint(VirtualMachine vm) {
        EventRequestManager erm = vm.eventRequestManager();
        List referenceTypes = vm.classesByName("java.lang.Throwable");
        for (ReferenceType refType : referenceTypes){
  ExceptionRequest exceptionRequest = erm.createExceptionRequest(refType, true, true);
  exceptionRequest.setEnabled(true);
 }
}

And then handle the exceptions:

public static void handleExceptionEvent(ExceptionEvent exceptionEvent) throws Exception {
        ObjectReference remoteException = exceptionEvent.exception();
        ThreadReference thread = exceptionEvent.thread();
        List paramList = new ArrayList(1);
        paramList.add(dumpFileName);
        //crer un printStream dans la JVM cible
        ObjectReference printStreamRef = printStreamClassType.newInstance(thread, printStreamConstructor, paramList,
            ObjectReference.INVOKE_SINGLE_THREADED);
    ReferenceType remoteType = remoteException.referenceType();
    Method printStackTrace = (Method) remoteType.methodsByName("printStackTrace").get(1);
    paramList.clear();
    paramList.add(printStreamRef);
    remoteException.invokeMethod(thread, printStackTrace, paramList, ObjectReference.INVOKE_SINGLE_THREADED);
    Scanner scanner = new Scanner(new File(dumpFileName.value()));
    while (scanner.hasNextLine()){
  System.out.println(scanner.nextLine());
 }
}

A bit heavy but it works, now how to catch the exceptions that are logged and the others?