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How to create the activiti expressions and listeners

valarmathi

Hi,
How can i use the activiti expressions(java script expressions) and listeners.
Please tell me the flow how can i do it?

Thanks,
Valarmathi P

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jbarrez

See http://activiti.org/userguide/index.html#executionListeners

Replace the 'class' with expression if you only need expressions.

In Activiti 5.11 (not yet released), it will be possible to use script tasks, like

<br> <userTask id="usertask1" name="All your base are belong to us"><br>&nbsp;&nbsp; <extensionElements><br>&nbsp;&nbsp;&nbsp; <activiti:taskListener event="create" class="org.activiti.engine.impl.bpmn.listener.ScriptTaskListener"><br>&nbsp;&nbsp;&nbsp;&nbsp; <activiti:field name="script"><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <activiti:string><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; def bar = "BAR";&nbsp; // local variable<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; foo = "FOO"; // pushes variable to execution context<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bar // implicit return value<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </activiti:string><br>&nbsp;&nbsp;&nbsp;&nbsp; </activiti:field><br>&nbsp;&nbsp;&nbsp;&nbsp; <activiti:field name="language" stringValue="groovy" /><br>&nbsp;&nbsp;&nbsp;&nbsp; <activiti:field name="resultVariable" stringValue="myVar" /><br>&nbsp;&nbsp;&nbsp; </activiti:taskListener><br>&nbsp;&nbsp; </extensionElements><br>&nbsp; </userTask><br>&nbsp; <br>

valarmathi

I used 5.10 ,what i have to do.I don't know how to use the expressions and listeners .Please help me if anybody knowa.

Thanks ,
Valarmathi P

jbarrez

Please check the docs I linked to:

eg

<br><br>&nbsp;&nbsp;&nbsp; <userTask id="firstTask" /><br>&nbsp;&nbsp;&nbsp; <sequenceFlow sourceRef="firstTask" targetRef="secondTask"><br>&nbsp;&nbsp;&nbsp; <extensionElements><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <activiti:executionListener class="org.activiti.examples.bpmn.executionListener.ExampleExecutionListenerTwo" /><br>&nbsp;&nbsp;&nbsp; </extensionElements><br>&nbsp;&nbsp;&nbsp; </sequenceFlow><br>&nbsp;&nbsp;&nbsp; <br><br>

valarmathi

Hi,

I used three usertask executionListeners ,

I got the following error.

Exception

com.vaadin.event.ListenerMethod$MethodException
Cause: org.activiti.engine.ActivitiException: couldn't instantiate class org.activiti.examples.bpmn.executionlistener.ExampleExecutionListenerOne
at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:510)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:164)
at com.vaadin.ui.AbstractComponent.fireEvent(AbstractComponent.java:1193)
at com.vaadin.ui.Button.fireClick(Button.java:539)
at com.vaadin.ui.Button.changeVariables(Button.java:206)
at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.handleVariableBurst(AbstractCommunicationManager.java:1299)
at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.handleVariables(AbstractCommunicationManager.java:1219)
at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.doHandleUidlRequest(AbstractCommunicationManager.java:735)
at com.vaadin.terminal.gwt.server.CommunicationManager.handleUidlRequest(CommunicationManager.java:296)
at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.service(AbstractApplicationServlet.java:501)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)
Caused by: org.activiti.engine.ActivitiException: couldn't instantiate class org.activiti.examples.bpmn.executionlistener.ExampleExecutionListenerOne
at org.activiti.engine.impl.util.ReflectUtil.instantiate(ReflectUtil.java:131)
at org.activiti.engine.impl.bpmn.helper.ClassDelegate.instantiateDelegate(ClassDelegate.java:162)
at org.activiti.engine.impl.bpmn.helper.ClassDelegate.getExecutionListenerInstance(ClassDelegate.java:76)
at org.activiti.engine.impl.bpmn.helper.ClassDelegate.notify(ClassDelegate.java:68)
at org.activiti.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:42)
at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:80)
at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:546)
at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:541)
at org.activiti.engine.impl.persistence.entity.ExecutionEntity.start(ExecutionEntity.java:335)
at org.activiti.engine.impl.cmd.StartProcessInstanceCmd.execute(StartProcessInstanceCmd.java:72)
at org.activiti.engine.impl.cmd.StartProcessInstanceCmd.execute(StartProcessInstanceCmd.java:31)
at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:42)
at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:42)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)
at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:40)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)
at org.activiti.engine.impl.RuntimeServiceImpl.startProcessInstanceById(RuntimeServiceImpl.java:63)
at org.activiti.engine.impl.RuntimeServiceImpl.startProcessInstanceById(RuntimeServiceImpl.java:63)
at org.activiti.explorer.ui.process.listener.StartProcessInstanceClickListener.buttonClick(StartProcessInstanceClickListener.java:71)
at sun.reflect.GeneratedMethodAccessor99.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:490)
… 22 more
Caused by: org.activiti.engine.ActivitiClassLoadingException: Class not found: org.activiti.examples.bpmn.executionlistener.ExampleExecutionListenerOne
at org.activiti.engine.impl.util.ReflectUtil.loadClass(ReflectUtil.java:81)
at org.activiti.engine.impl.util.ReflectUtil.instantiate(ReflectUtil.java:128)
… 44 more
Caused by: java.lang.ClassNotFoundException: org.activiti.examples.bpmn.executionlistener.ExampleExecutionListenerOne
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.activiti.engine.impl.util.ReflectUtil.loadClass(ReflectUtil.java:62)
… 45 more

Thanks,

Valarmathi P

frederikherema1

Make sure the classes you reference are in your class path of the activiti-explorer WAR…

valarmathi

I checked the class its there in my war file.but i'm getting the same error.
Please help me

Thanks,
Valarmathi P

frederikherema1

<br>Caused by: java.lang.ClassNotFoundException: org.activiti.examples.bpmn.executionlistener.ExampleExecutionListenerOne<br>

I think you should double-check if the class is rather in WEB-INF/classes or in a jar-file in the lib-folder…

valarmathi

I created Activity project only,so the class should be there in .bar file only.I tested in jUnit its running ,but Activity explorer showing the error.

Thanks,
Valarmathi P

frederikherema1

Userguide states:

Note that Java classes present in the business archive will not be added to the classpath. All custom classes used in process definitions in the business archive (for example Java service tasks or event listener implementations) should be present on the activiti-engine's classpath in order to run the processes.

The bar-file doesn't contain the java-classes. Another JAR-file is created, containing the classes. This should be on the class path

valarmathi

yes,another jar file is there on the class path,but can't upload the jar file in the Activity Explorer right.how can i do it?

Thanks,
Valarmathi P

frederikherema1

Again, it's NOT POSSIBLE to upload jar's (or classes) to activiti explorer. You should place the classes on the class path of the container the app is running in.

valarmathi

I put the jar file inside of the application tomcat webapps folder ,is this ok .Is ok means,where can i get the jar file.

Thanks,
Valarmathi P

frederikherema1

If you're using activiti Designer and an Activiti Project, the jar-file of the classes in your project will be created once you have requested "Generate deployments artifacts". There should be a jar-file alongside the .bar file. If not, there is possibly a compile-error.

If you're not using an Activiti project, bundle the jar-file as you would do with other java-rpject, using the mechanism of your choice (ANT, maven, export jar in eclipse, …)

valarmathi

I'm using Activiti project only,while using "Generate deployments artifacts" i got the .bar file and .jar file both .
Where can i put that jar file .I used to put activiti/apps/tomcat/webapps/xxx.jar file,then how can i get the jar from the activiti-explorer.

Thanks,
Valarmathi P

frederikherema1

Please consult google for inquiries like this. We're here to answer activiti-specific questions.

Adding a jar-file in a webapp is not really activiti-specific and a trivial thing to do if you're a java-developer…

valarmathi

I'm a developer only,if i put webapps folder in normal web applications means i know what i can do.
My question is where i can get the file from Activity explorer,if i upload .bar or xml file means i got it from activity explorer with activity diagram,thats'y i'm asking the question.Don't mistake me,i'm a java developer only.

Thanks,
Valarmathi P

frederikherema1

I really don't get the question. Are you trying to retrieve the JAR-file from the explorer-app to use elsewhere?

valarmathi

Obviously yes.If i upload the jar file from the class path how i will take the uploaded file activity diagram from the activity explorer.

Thanks
Valarmathi P

frederikherema1

You can't retrieve the JAR-file (containing the classes) from the activiti-explorer app. You can only view the deployments and their contents (.bar file) from the explorer APP or using the REST/Java API.

valarmathi

I have one more question,i don't know this is chilly question or not.

If i upload the class files (jar file) to the classpath,then i upload the bar file from the activiti explorer and start the process using explorer is it working fine or not.

Thanks,
Valarmathi P

frederikherema1

Yes, that should work fine. Keep in mind, however, most containers (like tomcat) require a restart when in order to pick up classpath-changes… So just dropping the JAR in the lib-folder won't cut it, when using tomcat, reboot is needed.

valarmathi

I did this,when i put the jar file in the lib folder i stopped the tomcat after putting the file i start the tomcat.But in the activiti explorer i can't upload the bar file.

Thanks,
Valarmathi P

valarmathi

Now is working fine.Export the project using eclipse in jar file and i have put it in the jar file into

these folders
C:\activiti-5.8\apps\apache-tomcat-6.0.32\webapps\activiti-explorer\WEB-INF\lib , C:\activiti-5.8\apps\apache-tomcat-6.0.32\webapps\activiti-rest\WEB-INF\lib ,
C:\activiti-5.8\apps\apache-tomcat-6.0.32\lib

Now working fine.Thanks Belgium.

Thanks,
Valarmathi P

amitbajaj

Hey i have got following error while deploying a bpmn20.xml file into activiti 5.15
11:15:13,950 [http-bio-8080-exec-1] INFO org.activiti.engine.impl.bpmn.deployer.BpmnDeployer - Processing resource capex_sanc_note.bpmn20.xml
11:15:14,102 [http-bio-8080-exec-1] INFO org.activiti.engine.impl.bpmn.deployer.BpmnDeployer - Processing resource capex_sanc_note.bpmn20.xml
Mar 30, 2014 11:15:14 AM com.vaadin.Application terminalError
SEVERE: Terminal error:
com.vaadin.event.ListenerMethod$MethodException: Invocation of method uploadFinished in org.activiti.explorer.ui.custom.UploadComponent failed.
at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:530)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:164)
at com.vaadin.ui.AbstractComponent.fireEvent(AbstractComponent.java:1219)
at com.vaadin.ui.Upload.fireUploadInterrupted(Upload.java:731)
at com.vaadin.ui.Upload$1.streamingFailed(Upload.java:1037)
at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.streamToReceiver(AbstractCommunicationManager.java:619)
at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.doHandleSimpleMultipartFileUpload(AbstractCommunicationManager.java:476)
at com.vaadin.terminal.gwt.server.CommunicationManager.handleFileUpload(CommunicationManager.java:259)
at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.service(AbstractApplicationServlet.java:495)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.activiti.explorer.filter.ExplorerFilter.doFilter(ExplorerFilter.java:44)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.NullPointerException
at org.activiti.explorer.ui.management.deployment.DeploymentUploadReceiver.showUploadedDeployment(DeploymentUploadReceiver.java:114)
at org.activiti.explorer.ui.management.deployment.DeploymentUploadReceiver.uploadFinished(DeploymentUploadReceiver.java:73)
at org.activiti.explorer.ui.custom.UploadComponent.uploadFinished(UploadComponent.java:197)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:510)

trademak

Do you have this issue with every bpmn20.xml file?

Best regards,

benreich

I have the same with every file.

benreich

I have the same with every file.