I've been working w/ some examples in the new Enterprise JavaBeans 3.0 book and
I created a simple timer to run every 10 minutes and check for data integrity.
When JBoss decides to let it run, it works great. However it doesn't always
work when I deploy the app....sometimes I get this exception:
| 11:45:20,480 ERROR [TimerServiceImpl] Cannot create txtimer
| java.lang.IllegalStateException: Unable to persist timer
| at
org.jboss.ejb.txtimer.DatabasePersistencePolicy.insertTimer(DatabasePersistencePolicy.java:126)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
| at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
| at java.lang.reflect.Method.invoke(Method.java:585)
| at
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
| at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
| at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
| at
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
| at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
| at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
| at $Proxy22.insertTimer(Unknown Source)
| at
org.jboss.ejb.txtimer.TimerServiceImpl.createTimer(TimerServiceImpl.java:256)
| at
org.jboss.ejb.txtimer.TimerServiceImpl.createTimer(TimerServiceImpl.java:202)
| at
com.agribeef.abcommerce.service.PollingServiceBean.init(PollingServiceBean.java:32)
|
My timer looks like this:
| @Stateless
| public class PollingServiceBean implements PollingService
| {
| @Resource
| private TimerService ts;
|
| private static final int timeout = 1000 * 60 * 10; //ten minutes
|
| public PollingServiceBean()
| {
| }
|
| public void init()
| {
| if (ts.getTimers().size() == 0)
| {
| this.ts.createTimer(5000, timeout, "pollServicesTimer");
| }
| }
|
| @Timeout
| public void startService(Timer timer)
| {
| try
| {
| //do something here....
| }
| catch (Exception exp)
| {
| // TODO Auto-generated catch block
| exp.printStackTrace();
| }
| }
| }
|
First of all, what is "txtimer", I haven't named my timer that?
It runs sometimes and runs well...and then I re-deploy the same code and get
the exception above...am I doing something wrong or is there a known problem?
Thanks!
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