topic Re: Add a receive task after my task programmatically in Alfresco Archive

Add a receive task after my task programmatically

esseti — Wed, 12 Jun 2013 08:07:57 GMT

Hi all,is there a way to post-process the Process adding (programmatically) a task (receive task)?I've to add this task after my personalised Java Task . <serviceTask id="servicetask1" name="MyTaskName" activiti:class="com.example.MyTask" activiti:extensionId="MyTask"> ‍‍in theory what i

Re: Add a receive task after my task programmatically

esseti — Thu, 13 Jun 2013 14:55:22 GMT

i ended up to do it via a XML parser. yet, if you do like this the diagram is not stored in the activiti engine.

Re: Add a receive task after my task programmatically

trademak — Fri, 14 Jun 2013 06:52:48 GMT

With the activiti-bpmn-converter module you can read a BPMN XML to a POJO model. Then in the POJO model you can add the receive task like you to do, and then generate the new BPMN XML out of there. You can look at the org.activiti.bpmn.converter.BpmnXMLConverter class.

Best regards,

Re: Add a receive task after my task programmatically

esseti — Mon, 17 Jun 2013 14:40:17 GMT

thnx, i'll give it a try.

Re: Add a receive task after my task programmatically

esseti — Tue, 25 Jun 2013 08:14:01 GMT

one thing.
i noticed that if i add the task via XML the diagram of the process is not stored nor accesible. this probably because the shapes do not match the diagram.
if i use solution here, will the diagram be available later? or what?
ciao

Re: Add a receive task after my task programmatically

frederikherema1 — Tue, 25 Jun 2013 09:24:55 GMT

Diagram information needs to be added manually, if you want to have that. Another option is to remove the existing diagram-info altogether, add the correct tasks and sequence-flows to the POJO-model and run the (experimental) auto-layout. See my blog for an example: http://stacktrace.be/blog/2013/03/dynamic-process-creation-and-deployment-in-100-lines/

After this, you add the BPMNModel POJO to a new deployment and the image will be generated at deploy-time.

Re: Add a receive task after my task programmatically

esseti — Tue, 25 Jun 2013 13:07:50 GMT

can this be done via rest API? i'm working with python (plain XML so far), calling the APIs to deployment and to start it.
in other case i can create a small "compiler" to do what i need.
can i add this function, maybe with a button, to the eclipse tool?

Re: Add a receive task after my task programmatically

trademak — Tue, 25 Jun 2013 15:37:42 GMT

No this is not available in the REST API, but you could add your own REST service to it. In Eclipse you would have to implement the same logic as Frederik mentioned.

Best regards,

Re: Add a receive task after my task programmatically

esseti — Mon, 01 Jul 2013 10:13:13 GMT

I see.
wouldn't make it sense to add an if condition on the deployment API that checks if diagram is correct (right now it raises a

WARN  org.activiti.engine.impl.bpmn.deployer.BpmnDeployer  - Error while generating process diagram, image will not be stored in repository

) and in case do the new BpmnAutoLayout(model).execute();?
or simply store whatever is in the <bpmndi:BPMNDiagram> without checking if it matches the actual diagram.

PS: would be terrific to have an API that returns the diagram (png) with the current task rounded by the red circle, as it happens for the activiti explorer. but probably it's out of scope.

Re: Add a receive task after my task programmatically

esseti — Mon, 01 Jul 2013 11:36:49 GMT

i'm trying to setup a java web app to create a rest api for doing what i need.
i got stuck at the init.
i've the ServletContextListener that does the init and destroy.
and the activiti.cfg.xml in the src folder:


<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

 <bean id="processEngineConfiguration"
  class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">
  <property name="databaseSchemaUpdate" value="true" />
  <property name="jobExecutorActivate" value="false" />
  <property name="jdbcUrl" value="jdbc:mysql://../activiti" />
  <property name="jdbcDriver" value="com.mysql.jdbc.Driver" />
  <property name="jdbcUsername" value="root" />
  <property name="jdbcPassword" value="psw" />
 </bean>
</beans>

but when lunching the project i got this error


SEVERE: Exception sending context destroyed event to listener instance of class org.crowdcomputer.ProcessEngineServletContextListener
java.lang.NoClassDefFoundError: Could not initialize class org.activiti.engine.ProcessEngines
 at org.crowdcomputer.ProcessEngineServletContextListener.contextDestroyed(ProcessEngineServletContextListener.java:42)
 at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:4927)
 at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5573)
 at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:160)
 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
 at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
 at java.util.concurrent.FutureTask.run(FutureTask.java:138)
 at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
 at java.lang.Thread.run(Thread.java:680)

any help? error message doesn't say much to me.

Re: Add a receive task after my task programmatically

jbarrez — Wed, 03 Jul 2013 09:13:16 GMT

The error is pretty obvious: it cant find the ProcessEngine class. So it seems the activiti-engine jar is not on your classpath?

Re: Add a receive task after my task programmatically

esseti — Thu, 04 Jul 2013 08:14:28 GMT

yes it's.
this is what i've in the libraries of the project


activiti-bpmn-converter-5.12.1.jar
activiti-bpmn-layout-5.12.1.jar
activiti-bpmn-model-5.12.1.jar
activiti-common-rest-5.12.1.jar
activiti-engine-5.12.1.jar
activiti-rest-5.12.1.jar
activiti-simple-workflow-5.12.1.jar
activiti-spring-5.12.1.jar

Re: Add a receive task after my task programmatically

frederikherema1 — Thu, 04 Jul 2013 08:37:08 GMT

The NoClassDef indicates the class was present at compile-time but not in the runtime-classpath. So make sure the class path of your tomcat actually contains the libraries…

Re: Add a receive task after my task programmatically

esseti — Mon, 08 Jul 2013 09:12:19 GMT

is the list i posted before correct?
i tried to copy it into the lib of tomcat and run it again. still the same error.

ciao

Re: Add a receive task after my task programmatically

frederikherema1 — Tue, 09 Jul 2013 08:40:47 GMT

You only have the actvivi-* jars, but activiti has other dependencies as well (e.g. myBatis, spring, …). Please use all dependencies that are mentioned in the pom.xml file or use the /lib/*.jar from the activiti-rest.war.

Re: Add a receive task after my task programmatically

esseti — Wed, 10 Jul 2013 07:45:44 GMT

with all the libraries of /lib/*.jar it works.

Re: Add a receive task after my task programmatically

frederikherema1 — Wed, 10 Jul 2013 07:49:02 GMT

Great! The /lib/* also contains libraries for the UI. So if you don't need that, you can remove them. Best to use maven though, this way you'll only end up with the jar you actually need when you only require the engine itself…

Re: Add a receive task after my task programmatically

esseti — Wed, 10 Jul 2013 08:59:32 GMT

I'm trying to do the parsing using java.
i've both model and process, but i don't get how i can parse the process and find out what are my classes.
with XML i was simply searching for all the tasks that have activiti:impl="mycalss".
from process class, instead, i can get all the flow elements but nothing else except the name.
what can i do?

Re: Add a receive task after my task programmatically

frederikherema1 — Wed, 10 Jul 2013 12:30:54 GMT

You should cast the flow-elements (after checking type with instanceof) to org.activiti.bpmn.model.ServiceTask. On there, you can call getImplementation(), which returns the classname you need…

Re: Add a receive task after my task programmatically

esseti — Thu, 11 Jul 2013 13:37:31 GMT

thanks.
just for the record, if someone need an example here my code https://github.com/esseti/BPMN4Crowd-Compiler not the best coding, but works.