topic problem with 'custom timer task' in Alfresco Archive https://connect.hyland.com/t5/alfresco-archive/problem-with-custom-timer-task/m-p/98665#M68057 <HTML><HEAD></HEAD><BODY><SPAN>Hi all,</SPAN><BR /><SPAN>I have to write something like timer task, that periodically checks a database for a value (e.g. timestamp) and when this value passes some condition, our process flow shall proceed. I have to create special custom task for it, not to design it as a process loop.</SPAN><BR /><BR /><SPAN>my task class:</SPAN><BR /><PRE class="language-none line-numbers"><CODE>public final class CustomTimerTask implements SignallableActivityBehavior, Serializable {<BR />&nbsp; <BR />&nbsp;&nbsp;&nbsp; @Override<BR />&nbsp;&nbsp;&nbsp; public void execute(ActivityExecution execution) throws Exception {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; signal(execution, null, null);<BR />&nbsp;&nbsp;&nbsp; }<BR /><BR />&nbsp;&nbsp;&nbsp; @Override<BR />&nbsp;&nbsp;&nbsp; public void signal(ActivityExecution execution, String signalEvent, Object signalData) throws Exception {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (evaluateTimer(execution)) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; leaveTask(execution);<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } else {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; scheduleNextTimer(execution);<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<BR />&nbsp;&nbsp;&nbsp; }<BR /><BR />&nbsp;&nbsp;&nbsp; private void scheduleNextTimer(ActivityExecution ae) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; TimerEntity timer = new TimerEntity();<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; timer.setRepeat(null);<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; timer.setJobHandlerType(TimerCatchIntermediateEventJobHandler.TYPE);<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; timer.setJobHandlerConfiguration(ae.getActivity().getId());<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DateTime dueDate = new DateTime().plusMinutes(getPeriod(ae));<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; timer.setDuedate(dueDate.toDate());<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; timer.setExecution((ExecutionEntity) ae);<BR /><BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Context.getCommandContext().getJobManager().schedule(timer);<BR />&nbsp;&nbsp;&nbsp; }<BR /><BR />&nbsp; private boolean evaluateTimer(ActivityExecution ae) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; … some logic<BR />&nbsp;&nbsp;&nbsp; }<BR />}<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN></CODE></PRE><BR /><SPAN>first execution passes correctly and new job is scheduled for execution. but my problem comes with next (sometimes 3rd - really!) scheduled execution.</SPAN><BR /><SPAN>the activiti scheduler logic throws ClassNotFoundException - cannot instantiate my timer task implementation.</SPAN><BR /><BR /><SPAN>Stacktrace:</SPAN><BR /><BLOCKQUOTE class="jive-quote">org.activiti.engine.ActivitiException: couldn't instantiate class de.workflow.task.TestTimerTask<BR />&nbsp;&nbsp;&nbsp;at org.activiti.engine.impl.util.ReflectUtil.instantiate(ReflectUtil.java:131)<BR />&nbsp;&nbsp;&nbsp;at org.activiti.engine.impl.bpmn.helper.ClassDelegate.instantiateDelegate(ClassDelegate.java:156)<BR />&nbsp;&nbsp;&nbsp;at org.activiti.engine.impl.bpmn.helper.ClassDelegate.getActivityBehaviorInstance(ClassDelegate.java:129)<BR />&nbsp;&nbsp;&nbsp;at org.activiti.engine.impl.bpmn.helper.ClassDelegate.signal(ClassDelegate.java:118)<BR />&nbsp;&nbsp;&nbsp;at org.activiti.engine.impl.jobexecutor.TimerCatchIntermediateEventJobHandler.execute(TimerCatchIntermediateEventJobHandler.java:43)<BR />&nbsp;&nbsp;&nbsp;at org.activiti.engine.impl.persistence.entity.JobEntity.execute(JobEntity.java:78)<BR />&nbsp;&nbsp;&nbsp;at org.activiti.engine.impl.persistence.entity.TimerEntity.execute(TimerEntity.java:62)<BR />&nbsp;&nbsp;&nbsp;at org.activiti.engine.impl.cmd.ExecuteJobsCmd.execute(ExecuteJobsCmd.java:61)<BR />&nbsp;&nbsp;&nbsp;at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)<BR />&nbsp;&nbsp;&nbsp;at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:42)<BR />&nbsp;&nbsp;&nbsp;at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:42)<BR />&nbsp;&nbsp;&nbsp;at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)<BR />&nbsp;&nbsp;&nbsp;at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:40)<BR />&nbsp;&nbsp;&nbsp;at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)<BR />&nbsp;&nbsp;&nbsp;at org.activiti.engine.impl.jobexecutor.ExecuteJobsRunnable.run(ExecuteJobsRunnable.java:36)<BR />&nbsp;&nbsp;&nbsp;at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)<BR />&nbsp;&nbsp;&nbsp;at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)<BR />&nbsp;&nbsp;&nbsp;at java.lang.Thread.run(Thread.java:619)<BR />Caused by: org.activiti.engine.ActivitiClassLoadingException: Class not found: de.workflow.task.TestTimerTask<BR />&nbsp;&nbsp;&nbsp;at org.activiti.engine.impl.util.ReflectUtil.loadClass(ReflectUtil.java:81)<BR />&nbsp;&nbsp;&nbsp;at org.activiti.engine.impl.util.ReflectUtil.instantiate(ReflectUtil.java:128)<BR />&nbsp;&nbsp;&nbsp;… 17 more<BR />Caused by: java.lang.ClassNotFoundException: de.workflow.task.TestTimerTask<BR />&nbsp;&nbsp;&nbsp;at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1576)<BR />&nbsp;&nbsp;&nbsp;at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)<BR />&nbsp;&nbsp;&nbsp;at java.lang.Class.forName0(Native Method)<BR />&nbsp;&nbsp;&nbsp;at java.lang.Class.forName(Class.java:247)<BR />&nbsp;&nbsp;&nbsp;at org.activiti.engine.impl.util.ReflectUtil.loadClass(ReflectUtil.java:62)<BR />&nbsp;&nbsp;&nbsp;… 18 more</BLOCKQUOTE><BR /><SPAN>we are using activiti 5.8 and we have an enterprice application built into EAR file, activiti jars are in EAR/lib directory and custom task implementation is in EAR/&lt;war-file&gt;/WEB-INF/classes (but I also tried to packed my class directly into activiti.jar).</SPAN><BR /><BR /><SPAN>thanx for any hint. I'm running out of ideas.</SPAN></BODY></HTML> Mon, 13 Feb 2012 14:43:59 GMT djanca 2012-02-13T14:43:59Z problem with 'custom timer task' https://connect.hyland.com/t5/alfresco-archive/problem-with-custom-timer-task/m-p/98665#M68057 Hi all,I have to write something like timer task, that periodically checks a database for a value (e.g. timestamp) and when this value passes some condition, our process flow shall proceed. I have to create special custom task for it, not to design it as a process loop.my task class<IMG id="smileytongue" class="emoticon emoticon-smileytongue" src="https://migration33.stage.lithium.com/i/smilies/16x16_smiley-tongue.png" alt="Smiley Tongue" title="Smiley Tongue" />ublic final cla Mon, 13 Feb 2012 14:43:59 GMT https://connect.hyland.com/t5/alfresco-archive/problem-with-custom-timer-task/m-p/98665#M68057 djanca 2012-02-13T14:43:59Z Re: problem with 'custom timer task' https://connect.hyland.com/t5/alfresco-archive/problem-with-custom-timer-task/m-p/98666#M68058 <HTML><HEAD></HEAD><BODY><SPAN>solved</SPAN><BR /><BR /><SPAN>the problem was caused by the fact, that multiple activiti engines ran against the same database and all of them had enabled jobExecutor. the class in question existed only in my local development environment.</SPAN><BR /><SPAN>silly problem&nbsp; :lol:</SPAN></BODY></HTML> Thu, 16 Feb 2012 13:01:24 GMT https://connect.hyland.com/t5/alfresco-archive/problem-with-custom-timer-task/m-p/98666#M68058 djanca 2012-02-16T13:01:24Z