DB remote connection problem

[odemwingie]

Hello, everyone!
I have configured activiti to work with Postgres and on this so-called "server" everything works great. But then I have decided to try remote connections. I have taken another PC (so-called "client"), where I configured activiti to work with DB on the "server". And every time when I start Tomcat on this "client" I have the following error message in the console:

Feb 24, 2013 2:12:44 PM org.apache.catalina.session.StandardManager doLoadSEVERE: IOException while loading persisted sessions: java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: org.activiti.explorer.navigation.ProcessNavigatorjava.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: org.activiti.explorer.navigation.ProcessNavigator        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)        at java.util.HashMap.readObject(HashMap.java:1155)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)        at java.lang.reflect.Method.invoke(Method.java:601)        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1004)        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1872)        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1777)        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1970)        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1894)        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1777)        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1970)        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1894)        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1777)        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)        at org.apache.catalina.session.StandardSession.readObject(StandardSession.java:1595)        at org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:1060)        at org.apache.catalina.session.StandardManager.doLoad(StandardManager.java:284)        at org.apache.catalina.session.StandardManager.load(StandardManager.java:204)        at org.apache.catalina.session.StandardManager.startInternal(StandardManager.java:491)        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5300)        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:977)        at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1655)        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)        at java.util.concurrent.FutureTask.run(FutureTask.java:166)        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)        at java.lang.Thread.run(Thread.java:722)Caused by: java.io.NotSerializableException: org.activiti.explorer.navigation.ProcessNavigator        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1180)        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)        at java.util.HashMap.writeObject(HashMap.java:1100)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)        at java.lang.reflect.Method.invoke(Method.java:601)        at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)        at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)        at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)        at org.apache.catalina.session.StandardSession.writeObject(StandardSession.java:1671)        at org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:1077)        at org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:432)        at org.apache.catalina.session.StandardManager.unload(StandardManager.java:353)        at org.apache.catalina.session.StandardManager.stopInternal(StandardManager.java:518)        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)        at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5480)        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)        at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1575)        at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1564)        … 5 moreFeb 24, 2013 2:12:44 PM org.apache.catalina.session.StandardManager startInternalSEVERE: Exception loading sessions from persistent storage java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: org.activiti.explorer.navigation.ProcessNavigator        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)        at java.util.HashMap.readObject(HashMap.java:1155)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)        at java.lang.reflect.Method.invoke(Method.java:601)        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1004)        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1872)        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1777)        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1970)        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1894)        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1777)        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1970)        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1894)        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1777)        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)        at org.apache.catalina.session.StandardSession.readObject(StandardSession.java:1595)        at org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:1060)        at org.apache.catalina.session.StandardManager.doLoad(StandardManager.java:284)        at org.apache.catalina.session.StandardManager.load(StandardManager.java:204)        at org.apache.catalina.session.StandardManager.startInternal(StandardManager.java:491)        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5300)        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:977)        at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1655)        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)        at java.util.concurrent.FutureTask.run(FutureTask.java:166)        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)        at java.lang.Thread.run(Thread.java:722)Caused by: java.io.NotSerializableException: org.activiti.explorer.navigation.ProcessNavigator        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1180)        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)        at java.util.HashMap.writeObject(HashMap.java:1100)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)        at java.lang.reflect.Method.invoke(Method.java:601)        at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)        at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)        at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)        at org.apache.catalina.session.StandardSession.writeObject(StandardSession.java:1671)        at org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:1077)        at org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:432)        at org.apache.catalina.session.StandardManager.unload(StandardManager.java:353)        at org.apache.catalina.session.StandardManager.stopInternal(StandardManager.java:518)        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)        at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5480)        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)        at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1575)        at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1564)        … 5 more‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Could you please tell what I should do to solve it?
Best regards,
Arsene

[jbarrez]

It's a know issue. When tomcat tries to boot, it tries to deserialize the sessions which were serialized to disk when the Tomcat shut down happened.
But the problem is that our classes are not all serializable, hence the exception. It doesn't have any influence, unless you are running the Explorer app in a cluster.

That being said, I'm currently actually working on resolving that very problem with serialization.

[odemwingie]

It's a know issue. When tomcat tries to boot, it tries to deserialize the sessions which were serialized to disk when the Tomcat shut down happened.
But the problem is that our classes are not all serializable, hence the exception. It doesn't have any influence, unless you are running the Explorer app in a cluster.

That being said, I'm currently actually working on resolving that very problem with serialization.

Thanks!

[jbarrez]

Good news! I just fixed it on master: https://github.com/Activiti/Activiti/commit/3bf619688fb13874520ec937c719f7833b11de89