Questions asked by Lars Tuchel

Loading classes from WEB-INF/lib

Lars Tuchel — Tue, 09 Jul 2019 07:31:24 -0400

Dear ivyteam

In our project we'd like to have the following structure: Our ivy project contains a jar which has some Java interfaces. Then we'd like the implementations for these interfaces in another external jar that we can deploy independently. Our idea was to put into the WEB-INF/lib folder.

But if we try to load the class from the jar (using ClassLoader#loadClass) we get a NoClassDefFound exception. Is there any way to get such a structure to work? Maybe with some class loader magic?

Best regards Lars

Deployment options for application zip

Lars Tuchel — Tue, 05 Feb 2019 12:04:16 -0500

Dear ivyteam

According to the documentation we can configure additional behaviour for the automatic deployment with a deploy.options.yaml file. Our package currently looks as follows:

application.zip
    projectA-1.0.iar
        ...
        deploy.options.yaml
    projectB-2.4.iar
        ...
        deploy.options.yaml

In the yaml files we configured properties like fileFormat: EXPANDED. Unfortunately this did not work and the iars were deployed packed. Only after we added a deploy.options.yaml file to the zip the iar were deployed expanded. Is this expected behaviour? The documentation is not very clear about that. (We're using ivy 7.1.x by the way)

We would like to have a yaml file per iar as the target version may be different for each iar. Is this supported?

Best regards, Lars

Can I use a WebSocket in Axon.ivy 6.x?

Lars Tuchel — Thu, 31 Aug 2017 08:55:55 -0400

Hi ivyTeam

I need to have a WebSocket in an ivyProject. I thought about using Primefaces Push Endpoints for this. I know about this solution for ivy 4.x and 5.x but this doesn't seem to work anymore. I get the following errors and no endpoints are available:

13:56:58.687 WARN [org.atmosphere.cpr.AsynchronousProcessor] [http-nio-8081-exec-3] [requestId=3] 
  Websocket protocol not supported
13:57:09.974 WARN [org.apache.catalina.loader.WebappClassLoaderBase] [localhost-startStop-2] [] 
  The web application [ivy] appears to have started a thread named [Atmosphere-Scheduler-4] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
   sun.misc.Unsafe.park(Native Method)
   java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
   java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
   java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.poll(ScheduledThreadPoolExecutor.java:1134)
   java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.poll(ScheduledThreadPoolExecutor.java:809)
   java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1066)
   java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
   java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
   java.lang.Thread.run(Thread.java:745)
13:57:09.975 WARN [org.apache.catalina.loader.WebappClassLoaderBase] [localhost-startStop-2] [] 
  The web application [ivy] appears to have started a thread named [Atmosphere-Scheduler-5] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
   sun.misc.Unsafe.park(Native Method)
   java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
   java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
   java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.poll(ScheduledThreadPoolExecutor.java:1129)
   java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.poll(ScheduledThreadPoolExecutor.java:809)
   java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1066)
   java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
   java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
   java.lang.Thread.run(Thread.java:745)
13:57:46.830 WARN [] [main] [executionContext=SYSTEM] 
  the logger can't be the child of org.eclipse.birt
13:59:28.618 WARN [org.atmosphere.cpr.DefaultAsyncSupportResolver] [http-nio-8081-exec-2] [requestId=1] 
  Found multiple containers, please specify which one to use: org.atmosphere.container.Tomcat7CometSupport, org.atmosphere.container.TomcatCometSupport,  until you do, Atmosphere will use:class org.atmosphere.container.Tomcat7CometSupport
13:59:28.638 ERROR [org.primefaces.push.PushServlet] [http-nio-8081-exec-2] [requestId=1] 
  No Annotated class using @PushEndpoint found. Push will not work.
13:59:28.664 WARN [org.atmosphere.cpr.AsynchronousProcessor] [http-nio-8081-exec-2] [requestId=1] 
  Websocket protocol not supported
14:02:04.718 WARN [org.apache.catalina.loader.WebappClassLoaderBase] [localhost-startStop-2] [] 
  The web application [ivy] appears to have started a thread named [Atmosphere-Scheduler-0] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
   sun.misc.Unsafe.park(Native Method)
   java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
   java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
   java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.poll(ScheduledThreadPoolExecutor.java:1134)
   java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.poll(ScheduledThreadPoolExecutor.java:809)
   java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1066)
   java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
   java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
   java.lang.Thread.run(Thread.java:745)
14:02:04.720 WARN [org.apache.catalina.loader.WebappClassLoaderBase] [localhost-startStop-2] [] 
  The web application [ivy] appears to have started a thread named [Atmosphere-Scheduler-6] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
   sun.misc.Unsafe.park(Native Method)
   java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
   java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
   java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.poll(ScheduledThreadPoolExecutor.java:1129)
   java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.poll(ScheduledThreadPoolExecutor.java:809)
   java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1066)
   java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
   java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
   java.lang.Thread.run(Thread.java:745)
14:03:26.818 WARN [] [main] [executionContext=SYSTEM] 
  the logger can't be the child of org.eclipse.birt
14:04:38.170 WARN [org.atmosphere.cpr.DefaultAsyncSupportResolver] [http-nio-8081-exec-2] [requestId=2] 
  Found multiple containers, please specify which one to use: org.atmosphere.container.Tomcat7CometSupport, org.atmosphere.container.TomcatCometSupport,  until you do, Atmosphere will use:class org.atmosphere.container.Tomcat7CometSupport
14:04:38.189 ERROR [org.primefaces.push.PushServlet] [http-nio-8081-exec-2] [requestId=2] 
  No Annotated class using @PushEndpoint found. Push will not work.
14:04:38.209 WARN [org.atmosphere.cpr.AsynchronousProcessor] [http-nio-8081-exec-2] [requestId=2] 
  Websocket protocol not supported
14:09:54.778 WARN [org.apache.catalina.loader.WebappClassLoaderBase] [localhost-startStop-2] [] 
  The web application [ivy] appears to have started a thread named [Atmosphere-Scheduler-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
   sun.misc.Unsafe.park(Native Method)
   java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
   java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
   java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.poll(ScheduledThreadPoolExecutor.java:1134)
   java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.poll(ScheduledThreadPoolExecutor.java:809)
   java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1066)
   java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
   java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
   java.lang.Thread.run(Thread.java:745)
14:09:54.779 WARN [org.apache.catalina.loader.WebappClassLoaderBase] [localhost-startStop-2] [] 
  The web application [ivy] appears to have started a thread named [Atmosphere-Scheduler-11] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
   sun.misc.Unsafe.park(Native Method)
   java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
   java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
   java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.poll(ScheduledThreadPoolExecutor.java:1129)
   java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.poll(ScheduledThreadPoolExecutor.java:809)
   java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1066)
   java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
   java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
   java.lang.Thread.run(Thread.java:745)
14:10:30.830 WARN [] [Worker-0] [executionContext=SYSTEM] 
  the logger can't be the child of org.eclipse.birt

Here's what I added to the web.xml:

  <servlet>
        <servlet-name>Push Servlet</servlet-name>
        <servlet-class>org.primefaces.push.PushServlet</servlet-class>
        <async-supported>true</async-supported>
        <init-param>
            <param-name>org.atmosphere.useWebSocketAndServlet3</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>org.atmosphere.websocket.suppressJSR356</param-name>
            <param-value>true</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>Push Servlet</servlet-name>
        <url-pattern>/primepush/*</url-pattern>
    </servlet-mapping>

And what I added to the webapps/ivy/WEB-INF/lib directory:

atmosphere-runtime-native-2.4.14.jar
atmosphere-compat-tomcat-2.0.1.jar
atmosphere-compat-jbossweb-2.0.1.jar
atmosphere-compat-tomcat7-2.0.1.jar

I saw that you implemented a websocket for the chat feature in the Portal (XIVY-519) so it should still work. But in the Portal project, the atmosphere jar is directly in the project so the old way in the question linked above probably doesn't work anymore...

TLDR; Could you give me a hint how I can create my own WebSocket endpoints in ivy 6.x?

Issue with receiving and sending the same signal in a process

Lars Tuchel — Tue, 05 Jul 2016 14:08:11 -0400

Hi everyone

So I have a process with a User Task that has a signal boundary event that listens to a certain signal X. After the user task is finished I check some values and depending on that I want to send the same signal X. See the image below:

But when that signal is sent I get the following exception:

java.lang.IllegalStateException: State of Task must be one of the following values CREATED, RESUMED but is DESTROYED
  at ch.ivyteam.api.API.checkObjectState(API.java:323)
  at ch.ivyteam.ivy.workflow.internal.Task.end(Task.java:2642)
  at ch.ivyteam.ivy.workflow.internal.Task$49.execute(Task.java:2618)
  at ch.ivyteam.ivy.persistence.base.AbstractPersistencyService.execute(AbstractPersistencyService.java:176)
  at ch.ivyteam.ivy.persistence.base.AbstractPersistencyService.execute(AbstractPersistencyService.java:233)
  at ch.ivyteam.ivy.persistence.base.ClassPersistencyService.execute(ClassPersistencyService.java:660)
[...]

I uploaded a demo project here: https://drive.google.com/file/d/0B3V8Sh7Fl7FXR3dzMFhzVzJlTEk/view?usp=sharing

Thanks in advance

How can I get the ClassLoader of a specific PMV

Lars Tuchel — Tue, 07 Jul 2015 14:36:24 -0400

Hi everyone

Is it possible to receive the ClassLoader of a specific Process Model/Process Model Version (if I already have an IProcessModelVersion instance)?

Best regards Lars

Failed to load Resources in Composite Components

Lars Tuchel — Thu, 11 Jun 2015 10:07:24 -0400

Hello

We have two projects project A and project B.

There's an ivy composite component in project A, which is used in a dialog in project B. If the composite component in project A uses a resource from the dialog directory, it can not be loaded an an error message is shown.

 Error (Http Status Code 500)

 ServletException
 Html Dialog with id ch.tuchella.libdemo.CompositeComponent not found

 Caused by
 IvyRuntimeException: Html Dialog with id ch.tuchella.libdemo.CompositeComponent not found
 [...]

If the composite component is used in the same project, or if the composite component does not include resources no error occurs.

Here's an example project.

Do you have any idea about this? Is it a known issue?

Best regards Lars Tuchel

Start a process in plain Java

Lars Tuchel — Fri, 06 Dec 2013 14:38:35 -0500

Is there a possibility to start a Xpert.ivy process from a Java bean in my ivy project? Either by calling a request start or a sub process...

Something like:

String signature = "myProcess()";
Set<IProcessStart> processes = ivy.wf.findProcessStartsBySignature(signature);
if(!processes.isEmpty()){
    IProcessStart process = processes.iterator().next();
    IProcessRequest request = RequestFactory.createProcessRequest(
        ivy.request.getProcessModelVersion(), process.getRequestPath(), 
        new HashMap<String, Object>()
    );
    try{
        // somehow send the request...
    }catch(Exception e){
        // do some exception handling if process fails...
    }
}

The main purpose is to be able to catch exceptions which may be thrown from the process.