DB remote connection problem

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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 doLoad
SEVERE: IOException while loading persisted sessions: java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: org.activiti.explorer.navigation.ProcessNavigator
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

Feb 24, 2013 2:12:44 PM org.apache.catalina.session.StandardManager startInternal
SEVERE: 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
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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.