EJB3 Timer - NotSerializableException

[jasperbg]

I'm using EJB3 Timer to schedule retries of failed billing jobs.

Here's the code that schedules a billing job for retrying:

public void schedule(@NonNull final Invoice invoice, @NonNull final BillingRetryType type) {
 Calendar twelveHoursFromNow = Calendar.getInstance();
 twelveHoursFromNow.add(Calendar.HOUR, 12);

 long everyTwelveHours = 12 * 60 * 60 * 1000;

 ctx.getTimerService().createTimer(twelveHoursFromNow.getTime(), everyTwelveHours, new RetryData(invoice, type));
 }

I get the following exception on the last line of the method:

13:03:04,124 ERROR [GeneralPurposeDatabasePersistencePlugin] Cannot serialize: nz.co.discountdomains.billing.ejb.RetryData@1cb4598
java.io.NotSerializableException: java.lang.reflect.Method
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1081)
 at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
 at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
 at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
 at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
 at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
 at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
 at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
 at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
 at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
 at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
 at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
 at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
 at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)
 at org.jboss.ejb.txtimer.GeneralPurposeDatabasePersistencePlugin.serialize(GeneralPurposeDatabasePersistencePlugin.java:365)
 at org.jboss.ejb.txtimer.GeneralPurposeDatabasePersistencePlugin.insertTimer(GeneralPurposeDatabasePersistencePlugin.java:184)
 at org.jboss.ejb.txtimer.DatabasePersistencePolicy.insertTimer(DatabasePersistencePolicy.java:111)
 at sun.reflect.GeneratedMethodAccessor69.invoke(Unknown Source)
 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.ejb3.timerservice.jboss.TimerServiceFacade.createTimer(TimerServiceFacade.java:56)
 at nz.co.discountdomains.billing.ejb.BillingRetryBean.schedule(BillingRetryBean.java:30)

(Exception snipped to make the post a bit shorter...)

The RetryData class is simple, it's defined as follows:

class RetryData implements Serializable {
 private static final long serialVersionUID = 1L;

 private Invoice invoice;
 private BillingRetryType type;

 public RetryData(Invoice invoice, BillingRetryType type) {
 this.invoice = invoice;
 this.type = type;
 }

 public Invoice getInvoice() {
 return invoice;
 }

 public BillingRetryType getType() {
 return type;
 }
}