Answers to: Start a process in plain Java

Answer by hungnam

hungnam — Mon, 18 Jun 2018 00:35:18 -0400

Hello, is that possible to call a sub process which call another html dialog inside. E.g

SubProcessCall.withPath("Functional Processes/callAnotherDialog").call();

I tried it and got exception with number 1 ClassCastException: java.lang.Object cannot be cast to ch.ivyteam.ivy.scripting.objects.util.IIvyDataObject. Number 2 solution work well

Comment by SupportIvyTeam on Daniel Oechslin's answer

SupportIvyTeam — Fri, 12 May 2017 04:18:31 -0400

You can invoke methods from the HD logic by using the EL expression factory. Within the called method you could run the sub proces...

package test;

import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.el.MethodExpression;
import javax.el.MethodInfo;
import javax.faces.bean.ManagedBean;
import javax.faces.context.FacesContext;

@ManagedBean
public class MyBean {

    public void doIt()
    {
        FacesContext context = FacesContext.getCurrentInstance();
        ExpressionFactory elFactory = context.getApplication().getExpressionFactory();
        ELContext elContext = context.getELContext();
        MethodExpression methodExpression = elFactory
                .createMethodExpression(elContext, "#{logic.fromBean2()}", String.class, new Class[0]);
        MethodInfo info = methodExpression.getMethodInfo(elContext);
        methodExpression.invoke(elContext, new Object[0]);
    }

}

Comment by Stelt0 on Daniel Oechslin's answer

Stelt0 — Thu, 11 May 2017 08:25:09 -0400

I really want, but I`m on version 6.0

Do I have alternative ?

Comment by SupportIvyTeam on Daniel Oechslin's answer

SupportIvyTeam — Thu, 11 May 2017 08:13:59 -0400

Try the new API above: SubProcessCall.... Does it work better?

Comment by Stelt0 on Daniel Oechslin's answer

Stelt0 — Thu, 11 May 2017 08:09:25 -0400

SubProcessRunner.exec(object, param) throws an error (null pointer ex) if it is run from ManagedBean. If i run it from BussinessProcess it is OK.

Is this 'by design' ?

Answer by Reguel Wermelinger

Reguel Wermelinger — Fri, 03 Mar 2017 09:42:11 -0500

Calling a Sub-Process from plain Java has become much simpler since Axon.ivy 6.3. There is now a nice fluent API to invoke a process and get back the the resulting data. The entry point is here: ch.ivyteam.ivy.process.call.SubProcessCall

You can find an example in the ConnectivityDemos where a Java REST-Service implementation starts a Process in the engine. See ConnectivityDemos -> com.axonivy.connectivity.rest.provider.ApprovalService.create(String, String, String)

ITask task = SubProcessCall.withPath("rest/createApproval")
                .withParam("title", title)
                .withParam("description", description)
                .call()
                .get("approvalTask", ITask.class);

Comment by Adrian Imfeld on Adrian Imfeld's answer

Adrian Imfeld — Thu, 07 Aug 2014 09:15:02 -0400

Yes, you can. But it is just one parameter object of class E. This could also be a parameter-list-object, a JSON string or a ivy dataclass. (Be careful about ivy dataclasses, they are not compatible by diffrent ProcessModelVersions PMV.)

Comment by HaraldWeber on Adrian Imfeld's answer

HaraldWeber — Wed, 06 Aug 2014 12:18:31 -0400

But you can't add parameters to the call.

Answer by Adrian Imfeld

Adrian Imfeld — Mon, 28 Jul 2014 13:54:56 -0400

Alternative (with System Events)

I do not like the search of the correct process.
To jump from plain Java in a Ivy process, I recommend an alternative way with System Events.

You have to change your process a little. Add a "event start" element instead the normal "request start" element. Or you can put it also next to the process start.

Write your one event bean like this:

public class SystemEventSubscriber extends AbstractProcessStartEventBean {...

Or you could use the example from ivyhacker

The java code to jump in the process looks nicer:

IApplication app = Ivy.wf().getApplication();
SystemEvent<E> event = 
  new SystemEvent<E>(SystemEventCategory.THIRD_PARTY, [identifier-string], [object of type E]);
app.sendSystemEvent(event);

Like this, you are able to jump to any start event with an identifier string, and you could hand out a parameter as an object type of your choice. For further information read this entry ivyhacker.

Conclusion:

(-) Small process changes
(+) Posibility to jump to any process step (activity)

Answer by Daniel Oechslin

Daniel Oechslin — Fri, 06 Dec 2013 14:41:50 -0500

Since Axon.ivy 4.3 you can start sub processes like this:

ISubProcessStart object;
if (className != null) {
    object = getSubProcess(className);
    if (object == null) {
        setProcessDataField(context, STATUS_MESSAGE_PROPERTY, StatusMessage.MESSAGE_TYPE_ERROR);
        return in;
    }
    results= SubProcessRunner.exec(object, param);
}



private ISubProcessStart getSubProcess(String className){

    //Create filter.
    SubProcessSearchFilter filter = SubProcessSearchFilter.create()
            .setProcessPathPattern(className) 
            .toFilter();

    //Result list of processes. picking first only.

    List<ISubProcessStart> foundSubProcesses = SubProcessRunner.findSubProcessStarts(filter);
    if (foundSubProcesses.isEmpty()) {
        return null;
    }
    return foundSubProcesses.get(0);
}

You need to handle the exceptions within the subprocesses. You can't handle it to the parent class.