10:14 a.m.
hi everyone!
i have a problem while trying to use custom task instances in jbpm.
for the first test i just wantet to copy the usual taskInstance and add an addittional
property. the table gets created in the database and everything seems to work, but in the
end when i try to save the process instance i get an hibernate error. i'm using jbpm
3.1.1 with ms sql server 2003 and jboss ide 1.6.
i have done what was mentioned in the userguide and in this forum:
- create a subclass of TaskInstance
| public class CustomTaskInstance extends TaskInstance {
|
| private String customProperty;
|
| public String getCustomProperty() {
| return customProperty;
| }
|
| public void setCustomProperty(String customProperty) {
| this.customProperty = customProperty;
| }
|
| }
|
|
- create an implementation of org.jbpm.taskmgmt.TaskInstanceFactory
| public class CustomTaskInstanceFactoryImpl implements TaskInstanceFactory {
|
| public TaskInstance createTaskInstance(ExecutionContext executionContext) {
|
| //just a simple mapping to CustomTaskInstance
|
| return new CustomTaskInstance();
| }
|
| }
|
|
- update the property jbpm.task.instance.factory to specify the name of custom class
| <bean name='jbpm.task.instance.factory'
class='com.dumdidum.pc.CustomTaskInstanceFactoryImpl' singleton='true'
/>
|
- create a mapping file for the subclass, for mapping the extra properties you want to
save
| <?xml version="1.0"?>
|
| <!DOCTYPE hibernate-mapping PUBLIC
| "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
| "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
|
| <hibernate-mapping default-access="field">
|
| <class name="com.dumdidum.pc.CustomTaskInstance"
| table="JBPM_CUSTOMTASKINSTANCE"
| discriminator-value="C">
| <id name="id" column="ID_"><generator
class="native" /></id>
| <discriminator type="char" column="CLASS_"/>
|
| <property name="name" column="NAME_" />
| <property name="description" column="DESCRIPTION_"
type="string_max" length="4000"/>
| <property name="actorId" column="ACTORID_"
index="IDX_TASK_ACTORID"/>
| <property name="create" column="CREATE_" />
| <property name="start" column="START_" />
| <property name="end" column="END_" />
| <property name="dueDate" column="DUEDATE_" />
| <property name="priority" column="PRIORITY_" />
| <property name="isCancelled" column="ISCANCELLED_" />
| <property name="isSuspended" column="ISSUSPENDED_" />
| <property name="isOpen" column="ISOPEN_" />
| <property name="isSignalling" column="ISSIGNALLING_" />
| <property name="isBlocking" column="ISBLOCKING_" />
| <property name="customProperty" column="CUSTOMPROPERTY_"
/>
|
| <many-to-one name="task"
| column="TASK_"
| foreign-key="FK_TASKINST_TASK"/>
| <many-to-one name="token"
| column="TOKEN_"
| foreign-key="FK_TASKINST_TOKEN"/>
| <many-to-one name="swimlaneInstance"
| column="SWIMLANINSTANCE_"
| foreign-key="FK_TASKINST_SLINST"/>
| <many-to-one name="taskMgmtInstance"
| column="TASKMGMTINSTANCE_"
| foreign-key="FK_TASKINST_TMINST"/>
|
| <map name="variableInstances" cascade="all">
| <key column="TASKINSTANCE_"
foreign-key="FK_VAR_TSKINST"/>
| <index type="string" column="NAME_" />
| <one-to-many class="org.jbpm.context.exe.VariableInstance" />
| </map>
| <set name="pooledActors"
| cascade="all"
| table="JBPM_TASKACTORPOOL">
| <key column="TASKINSTANCE_"
foreign-key="FK_TASKACTPL_TSKI"/>
| <many-to-many class="org.jbpm.taskmgmt.exe.PooledActor"
column="POOLEDACTOR_" />
| </set>
| <list name="comments" cascade="all" >
| <key column="TASKINSTANCE_" />
| <index column="TASKINSTANCEINDEX_" />
| <one-to-many class="org.jbpm.graph.exe.Comment" />
| </list>
|
| </class>
|
| </hibernate-mapping>
|
|
- add that mapping file to the list of mapping files
| <mapping resource="com/dumdidum/pc/CustomTaskInstance.hbm.xml"/>
|
- use custom assignementHandler
| public class MyAssignmentHandler implements AssignmentHandler {
|
| public void assign(Assignable assignable, ExecutionContext executionContext)
| throws Exception {
|
|
| CustomTaskInstance cti = (CustomTaskInstance) assignable;
| cti.setActorId("UserPc1");
| cti.setCustomProperty("testtest");
|
| }
|
| }
|
|
the simple process:
| <?xml version="1.0" encoding="UTF-8"?>
|
| <process-definition
| xmlns="urn:jbpm.org:jpdl-3.1" name="simpleTask">
| <start-state name="start">
| <transition name="" to="task1"></transition>
| </start-state>
| <end-state name="end1"></end-state>
| <task-node name="task1">
| <task name="testTask">
| <assignment
class="com.dumdidum.pc.MyAssignmentHandler"></assignment>
| </task>
| <transition name="" to="state1"></transition>
| </task-node>
| <state name="state1">
| <transition name="" to="end1"></transition>
| </state>
| </process-definition>
|
the result is the following error when trying to flush the session:
| 17:10:42,305 [main] DEBUG Services : executing default save operations
| 17:10:42,305 [main] DEBUG HibernateSaveOperation : saving process instance
| 17:10:42,305 [main] DEBUG SaveLogsOperation : flushing logs to logging service.
| org.jbpm.persistence.JbpmPersistenceException: couldn't commit hibernate session
| at org.jbpm.persistence.db.DbPersistenceService.close(DbPersistenceService.java:171)
| at org.jbpm.svc.Services.close(Services.java:211)
| at org.jbpm.JbpmContext.close(JbpmContext.java:141)
| at com.rockwell.pc.JBPMWrapper.participateInProcess(JBPMWrapper.java:218)
| at com.rockwell.pc.ProcessTester.main(ProcessTester.java:36)
| Caused by: org.hibernate.AssertionFailure: null id in
org.jbpm.taskmgmt.log.TaskAssignLog entry (don't flush the Session after an exception
occurs)
| at
org.hibernate.event.def.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:48)
| at
org.hibernate.event.def.DefaultFlushEntityEventListener.getValues(DefaultFlushEntityEventListener.java:150)17:10:42,315
[main] WARN JDBCExceptionReporter : SQL Error: 547, SQLState: 23000
| 17:10:42,315 [main] ERROR JDBCExceptionReporter : INSERT statement conflicted with
COLUMN FOREIGN KEY constraint 'FK_LOG_TASKINST'. The conflict occurred in database
'JBPM', table 'JBPM_TASKINSTANCE', column 'ID_'.
| 17:10:42,315 [main] DEBUG JbpmContext : closing JbpmContext
| 17:10:42,315 [main] DEBUG Services : closing service 'persistence':
org.jbpm.persistence.db.DbPersistenceService@1abdac9
| 17:10:42,315 [main] DEBUG DbPersistenceService : committing hibernate transaction
| 17:10:42,325 [main] ERROR AssertionFailure : an assertion failure occured (this may
indicate a bug in Hibernate, but is more likely due to unsafe use of the session)
| org.hibernate.AssertionFailure: null id in org.jbpm.taskmgmt.log.TaskAssignLog entry
(don't flush the Session after an exception occurs)
| at
org.hibernate.event.def.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:48)
| at
org.hibernate.event.def.DefaultFlushEntityEventListener.getValues(DefaultFlushEntityEventListener.java:150)
| at
org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:106)
| at
org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:195)
| at
org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76)
| at
org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
| at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:980)
| at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:353)
| at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
| at org.jbpm.persistence.db.DbPersistenceService.close(DbPersistenceService.java:161)
| at org.jbpm.svc.Services.close(Services.java:211)
| at org.jbpm.JbpmContext.close(JbpmContext.java:141)
| at com.rockwell.pc.JBPMWrapper.participateInProcess(JBPMWrapper.java:218)
| at com.rockwell.pc.ProcessTester.main(ProcessTester.java:36)
| 17:10:42,345 [main] ERROR Services : problem closing service 'persistence'
| org.jbpm.persistence.JbpmPersistenceException: couldn't commit hibernate session
| at org.jbpm.persistence.db.DbPersistenceService.close(DbPersistenceService.java:171)
| at org.jbpm.svc.Services.close(Services.java:211)
| at org.jbpm.JbpmContext.close(JbpmContext.java:141)
| at com.rockwell.pc.JBPMWrapper.participateInProcess(JBPMWrapper.java:218)
| at com.rockwell.pc.ProcessTester.main(ProcessTester.java:36)
| Caused by: org.hibernate.AssertionFailure: null id in
org.jbpm.taskmgmt.log.TaskAssignLog entry (don't flush the Session after an exception
occurs)
| at
org.hibernate.event.def.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:48)
| at
org.hibernate.event.def.DefaultFlushEntityEventListener.getValues(DefaultFlushEntityEventListener.java:150)
| at
org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:106)
| at
org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:195)
| at
org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76)
| at
org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
| at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:980)
| at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:353)
| at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
| at org.jbpm.persistence.db.DbPersistenceService.close(DbPersistenceService.java:161)
| ... 4 more
|
| at
org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:106)
| at
org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:195)
| at
org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76)
| at
org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
| at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:980)
| at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:353)
| at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
| at org.jbpm.persistence.db.DbPersistenceService.close(DbPersistenceService.java:161)
| ... 4 more
| org.jbpm.JbpmException: problem closing services
{persistence=org.jbpm.persistence.JbpmPersistenceException: couldn't commit hibernate
session}
| at org.jbpm.svc.Services.close(Services.java:223)
| at org.jbpm.JbpmContext.close(JbpmContext.java:141)
| at com.rockwell.pc.JBPMWrapper.participateInProcess(JBPMWrapper.java:218)
| at com.rockwell.pc.ProcessTester.main(ProcessTester.java:36)
| Caused by: org.jbpm.persistence.JbpmPersistenceException: couldn't commit
hibernate session
| at org.jbpm.persistence.db.DbPersistenceService.close(DbPersistenceService.java:171)
| at org.jbpm.svc.Services.close(Services.java:211)
| ... 3 more
| Caused by: org.hibernate.AssertionFailure: null id in
org.jbpm.taskmgmt.log.TaskAssignLog entry (don't flush the Session after an exception
occurs)
| at
org.hibernate.event.def.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:48)
| at
org.hibernate.event.def.DefaultFlushEntityEventListener.getValues(DefaultFlushEntityEventListener.java:150)
| at
org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:106)
| at
org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:195)
| at
org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76)
| at
org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
| at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:980)
| at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:353)
| at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
| at org.jbpm.persistence.db.DbPersistenceService.close(DbPersistenceService.java:161)
| ... 4 more
| 17:10:42,345 [main] DEBUG Services : closing service 'logging':
org.jbpm.logging.db.DbLoggingService@1e8c585
|
|
any help would be appreciated!
best regards
gregor
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