I have a process where I call another subprocess in a loop.
<code>
<callActivity id="callactivity_PickArticle" name="Pick article" calledElement="pickArticleSubProcess">
<extensionElements>
<activiti:in source="OrderLine" target="CurrentOrderLine"/>
</extensionElements>
<multiInstanceLoopCharacteristics isSequential="true" activiti:collection="${Order.orderLines}" activiti:elementVariable="OrderLine">
</multiInstanceLoopCharacteristics>
</callActivity>
<code>
This subprocess should update the passed element variable and in the end persist the changes to the database.
<code>
<process id="pickArticleSubProcess" name="Pick article process" isExecutable="true">
<startEvent id="startevent1" name="Start"></startEvent>
<endEvent id="endevent1" name="End"></endEvent>
<userTask id="usertask_ConfirmLocation" name="Go to location">
<extensionElements>
<activiti:formProperty id="locationCode" name="locationCode" required="true"></activiti:formProperty>
</extensionElements>
</userTask>
<userTask id="usertask_ConfirmQuantity" name="Confirm Quantity">
<extensionElements>
<activiti:formProperty id="quantity" name="quantity" required="true"></activiti:formProperty>
<activiti:formProperty id="reasonCode" name="reasonCode"></activiti:formProperty>
</extensionElements>
</userTask>
<sequenceFlow id="flow2" sourceRef="usertask_ConfirmLocation" targetRef="usertask_ConfirmQuantity"></sequenceFlow>
<serviceTask id="servicetask_BookArticle" name="Book article" activiti:delegateExpression="${BookArticleDelegate}"></serviceTask>
<sequenceFlow id="flow3" sourceRef="usertask_ConfirmQuantity" targetRef="servicetask_BookArticle"></sequenceFlow>
<sequenceFlow id="flow4" sourceRef="servicetask_BookArticle" targetRef="endevent1"></sequenceFlow>
<sequenceFlow id="flow5" sourceRef="startevent1" targetRef="usertask_ConfirmLocation"></sequenceFlow>
</process>
<code>
When I save the current orderline with: orderLineService.saveOrderLine(orderLine);, directly after the delegate the orderline is persisted. But when I complete the last orderline in the multi instance, all the orderlines, except the last one, are changed back to all the values null.
<code>
@Component("BookArticleDelegate")
public class BookArticleDelegate implements JavaDelegate {
@Autowired
private OrderLineService orderLineService;
@Override
public void execute(DelegateExecution de) {
OrderLine orderLine = (OrderLine) de.getVariable("CurrentOrderLine");
String sQuantity = (String) de.getVariable("quantity");
int quantity = Integer.parseInt(sQuantity);
String reason;
try {
reason = (String) de.getVariable("reasonCode");
orderLine.setReasonCode(reason);
} catch (Exception ex) {
}
orderLine.setPickedAmount(quantity);
orderLine.setHandled(true);
orderLineService.saveOrderLine(orderLine);
}
}
<code>
Something is going wrong, but I can't figure out what.
-- EDIT
I made the collection Order transient, because I believe it has something to do with managed entities that overwrite my own commits. Now after the first iteration through the multi instance call activity I get the following error:
<code>
Exception in thread "Thread-12" org.activiti.engine.ActivitiException: Could not execute inner activity behavior of multi instance behavior
at org.activiti.engine.impl.bpmn.behavior.SequentialMultiInstanceBehavior.leave(SequentialMultiInstanceBehavior.java:117)
at org.activiti.engine.impl.bpmn.behavior.MultiInstanceActivityBehavior.completed(MultiInstanceActivityBehavior.java:172)
at org.activiti.engine.impl.agenda.EndExecutionOperation.handleProcessInstanceExecution(EndExecutionOperation.java:98)
at org.activiti.engine.impl.agenda.EndExecutionOperation.handleRegularExecution(EndExecutionOperation.java:166)
at org.activiti.engine.impl.agenda.EndExecutionOperation.run(EndExecutionOperation.java:48)
at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperation(CommandInvoker.java:73)
at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperations(CommandInvoker.java:57)
at org.activiti.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:42)
at org.activiti.engine.impl.interceptor.TransactionContextInterceptor.execute(TransactionContextInterceptor.java:48)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:63)
at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:47)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133)
at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:45)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:29)
at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:44)
at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:39)
at org.activiti.engine.impl.TaskServiceImpl.complete(TaskServiceImpl.java:186)
at com.mycompany.poc.inther.lc.workflow.workstation.engine.WorkflowEngineCore.completeTask(WorkflowEngineCore.java:102)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy83.completeTask(Unknown Source)
at com.mycompany.poc.inther.lc.workflow.workstation.WorkstationCore.handleTerminalTaskResponse(WorkstationCore.java:133)
at com.mycompany.poc.inther.lc.workflow.workstation.WorkstationCore$1.run(WorkstationCore.java:74)
Caused by: java.lang.NullPointerException
at org.activiti.engine.impl.bpmn.behavior.MultiInstanceActivityBehavior.executeOriginalBehavior(MultiInstanceActivityBehavior.java:199)
at org.activiti.engine.impl.bpmn.behavior.SequentialMultiInstanceBehavior.leave(SequentialMultiInstanceBehavior.java:109)
... 32 more
</code>
I found a JIRA issue which I believe covers the same problem, but I can't find the solution.
Activiti: Multi Instance Collapsed Sub Process - NullPointerException
