4:09 p.m.
Swaminathan Bhaskar [https://community.jboss.org/people/swaminathan.bhaskar] created the
discussion
"Programmatic interaction with Human Task"
To view the discussion, visit: https://community.jboss.org/message/741849#741849
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I am using JBPM 5.2 and am trying to programmatically intyeract with Human task. I just
have one user task in my process.
Here is my code:
public class sample06 {
public static final String BPMN_RESOURCE = "sample06.bpmn";
public static final String BPM_PROCESS = "sample06";
public static final String BPM_USER = "joe";
private static TaskServer taskServer = null;
public static final void main(String[] args) {
try {
setupDS();
setupTS();
TaskClient taskClient = new TaskClient(new
MinaTaskClientConnector("sample06", new
MinaTaskClientHandler(SystemEventListenerFactory.getSystemEventListener())));
taskClient.connect("127.0.0.1", 9123);
// Setup JPA persistence
EntityManagerFactory emfJBPM =
Persistence.createEntityManagerFactory("org.jbpm.persistence.jpa");
Environment env = KnowledgeBaseFactory.newEnvironment();
env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emfJBPM);
env.set(EnvironmentName.TRANSACTION_MANAGER,
TransactionManagerServices.getTransactionManager());
// Load and setup the BPM process
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource(BPMN_RESOURCE),
ResourceType.BPMN2);
// Do we have any errors ?
if (kbuilder.hasErrors()) {
if (kbuilder.getErrors().size() > 0) {
for (KnowledgeBuilderError error : kbuilder.getErrors()) {
System.out.printf("Error building KnowledgeBase: %s\n",
error.getMessage());
}
}
throw new RuntimeException("Error building KnowledgeBase");
}
KnowledgeBase kbase = kbuilder.newKnowledgeBase();
StatefulKnowledgeSession ksession =
JPAKnowledgeService.newStatefulKnowledgeSession(kbase, null, env);
ksession.getWorkItemManager().registerWorkItemHandler("Human
Task", new WSHumanTaskHandler());
// ksession.getWorkItemManager().registerWorkItemHandler("Human
Task", new CommandBasedWSHumanTaskHandler(ksession));
System.out.printf("\n-----> Session ID: %d\n",
ksession.getId());
// Create the process instance
ProcessInstance processInstance =
ksession.createProcessInstance(BPM_PROCESS, null);
System.out.printf("\n-----> Starting new Business process %s
\n", processInstance.getProcessId(), processInstance.getId());
// Start the BPM process
ksession.startProcessInstance(processInstance.getId());
List tasks = null;
// Use task client to fetch tasks for the owner
{
BlockingTaskSummaryResponseHandler summaryHandler = new
BlockingTaskSummaryResponseHandler();
taskClient.getTasksAssignedAsPotentialOwner(BPM_USER, null,
summaryHandler);
summaryHandler.waitTillDone(1000);
tasks = summaryHandler.getResults();
}
for (TaskSummary task : tasks) {
long taskId = task.getId();
String taskName = task.getName();
// Claim the task
{
BlockingTaskOperationResponseHandler claimHandler = new
BlockingTaskOperationResponseHandler();
taskClient.claim(taskId, BPM_USER, claimHandler);
claimHandler.waitTillDone(1000);
System.out.printf("\n-----> Task %s <%d>
claimed\n", taskName, taskId);
}
// Start the task
{
BlockingTaskOperationResponseHandler startHandler = new
BlockingTaskOperationResponseHandler();
taskClient.start(taskId, BPM_USER, startHandler);
startHandler.waitTillDone(1000);
System.out.printf("\n-----> Task %s <%d>
started\n", taskName, taskId);
}
// Complete the task
{
BlockingTaskOperationResponseHandler completeHandler = new
BlockingTaskOperationResponseHandler();
taskClient.complete(taskId, BPM_USER, null, completeHandler);
completeHandler.waitTillDone(1000);
System.out.printf("\n-----> Task %s <%d>
completed\n", taskName, taskId);
}
}
// Did the process instance complete successfully ?
if (processInstance.getState() == ProcessInstance.STATE_COMPLETED) {
System.out.printf("\n-----> Business process %s successfully
completed\n", processInstance.getProcessId(), processInstance.getId());
}
taskClient.disconnect();
taskServer.stop();
}
catch (Exception ex) {
ex.printStackTrace(System.err);
System.exit(1);
}
System.exit(0);
}
public static void setupDS() throws Exception {
// Setup Datasource
PoolingDataSource mysqlDS = new PoolingDataSource();
mysqlDS.setUniqueName("jdbc/MySQL-DS");
mysqlDS.setClassName("com.mysql.jdbc.jdbc2.optional.MysqlXADataSource");
mysqlDS.setMaxPoolSize(3);
mysqlDS.setAllowLocalTransactions(true);
mysqlDS.getDriverProperties().put("user", "*****");
mysqlDS.getDriverProperties().put("password", "*****");
mysqlDS.getDriverProperties().put("URL",
"jdbc:mysql://localhost:3306/mytestdb");
mysqlDS.init();
}
public static void setupTS() throws Exception {
// Setup Task persistence
EntityManagerFactory emfTASK =
Persistence.createEntityManagerFactory("org.jbpm.task");
// Setup Human Task Service
System.out.printf("\n-----> Ready to start Mina Task service
.....\n");
TaskService taskService = new TaskService(emfTASK,
SystemEventListenerFactory.getSystemEventListener());
TaskServiceSession taskSession = taskService.createSession();
taskSession.addUser(new User(BPM_USER));
taskServer = new MinaTaskServer(taskService);
Thread thread = new Thread(taskServer);
thread.start();
while (!taskServer.isRunning()) {
System.out.print(".");
Thread.sleep(50);
}
System.out.print("Mina Task service started successfully !!!!!\n");
}
}
When I run the code, encounter the following exception:
14/06 16:49:24,245[NioProcessor-4] ERROR
hibernate.util.JDBCExceptionReporter.logExceptions - Cannot add or update a child row: a
foreign key constraint fails (`mytestdb`.`peopleassignments_bas`, CONSTRAINT
`FK9D8CF4EC2C122ED2` FOREIGN KEY (`entity_id`) REFERENCES `organizationalentity` (`id`))
14/06 16:49:24,245[NioProcessor-4] ERROR
event.def.AbstractFlushingEventListener.performExecutions - Could not synchronize
database state with session
org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:94)
at
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)
at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:114)
at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:109)
at
org.hibernate.jdbc.AbstractBatcher.prepareBatchStatement(AbstractBatcher.java:244)
at
org.hibernate.persister.collection.AbstractCollectionPersister.recreate(AbstractCollectionPersister.java:1141)
at
org.hibernate.action.CollectionRecreateAction.execute(CollectionRecreateAction.java:58)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:171)
at
org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
at
org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1028)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:366)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137)
at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:54)
at
org.jbpm.task.service.TaskServiceSession.doOperationInTransaction(TaskServiceSession.java:971)
at org.jbpm.task.service.TaskServiceSession.addTask(TaskServiceSession.java:171)
at
org.jbpm.task.service.TaskServerHandler.messageReceived(TaskServerHandler.java:109)
at
org.jbpm.task.service.mina.MinaTaskServerHandler.messageReceived(MinaTaskServerHandler.java:41)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:716)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796)
at
org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:427)
at
org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:245)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796)
at
org.apache.mina.filter.logging.LoggingFilter.messageReceived(LoggingFilter.java:177)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796)
at
org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:119)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:426)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:692)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:645)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:634)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:66)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:1078)
at
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Any ideas ? Any help appreciated.
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