Hello,

Sometimes JSPwiki 2.10.1 throws exception to $CATALINA_HOME/logs/catalina.out

java.io.WriteAbortedException: writing aborted; 
java.io.NotSerializableException: 
org.apache.wiki.ui.progress.ProgressManager$JSONTracker

at startup. Everything seems to work properly. All access rights for both 
data/config files are set to user running Tomcat.

I am not a Java programmer, so I have no idea if this error is important or 
save to ignore. Or is that a bug, that should be reported?

With regards

Leoš

21-May-2015 09:53:31.781 INFO [main] 
org.apache.catalina.startup.VersionLoggerListener.log Server version:        
Apache Tomcat/8.0.22
21-May-2015 09:53:31.782 INFO [main] 
org.apache.catalina.startup.VersionLoggerListener.log Server built:          
Apr 29 2015 11:46:15 UTC
21-May-2015 09:53:31.782 INFO [main] 
org.apache.catalina.startup.VersionLoggerListener.log Server number:         
8.0.22.0
21-May-2015 09:53:31.783 INFO [main] 
org.apache.catalina.startup.VersionLoggerListener.log OS Name:               
Linux
...
21-May-2015 09:40:56.190 INFO [localhost-startStop-1] 
com.metaparadigm.jsonrpc.JSONRPCBridge.registerLocalArgResolver registered 
local arg resolver com.metaparadigm.jsonrpc.JSONRPCBridgeServletArgResolver for 
local class com.metaparadigm.jsonrpc.JSONRPCBridge with context 
javax.servlet.http.HttpServletRequest
21-May-2015 09:40:56.224 SEVERE [localhost-startStop-1] 
org.apache.catalina.session.StandardManager.doLoad standardManager.loading.ioe
 java.io.WriteAbortedException: writing aborted; 
java.io.NotSerializableException: 
org.apache.wiki.ui.progress.ProgressManager$JSONTracker
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1355)
        at 
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
        at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
        at java.util.HashMap.readObject(HashMap.java:1396)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at 
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)
        at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
        at 
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
        at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
        at 
org.apache.catalina.session.StandardSession.doReadObject(StandardSession.java:1634)
        at 
org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:1099)
        at 
org.apache.catalina.session.StandardManager.doLoad(StandardManager.java:261)
        at 
org.apache.catalina.session.StandardManager.load(StandardManager.java:180)
        at 
org.apache.catalina.session.StandardManager.startInternal(StandardManager.java:460)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at 
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5184)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at 
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
        at 
org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:945)
        at 
org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1768)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.NotSerializableException: 
org.apache.wiki.ui.progress.ProgressManager$JSONTracker
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
        at java.util.HashMap.internalWriteEntries(HashMap.java:1777)
        at java.util.HashMap.writeObject(HashMap.java:1354)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
        at 
org.apache.catalina.session.StandardSession.doWriteObject(StandardSession.java:1710)
        at 
org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:1116)
        at 
org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:401)
        at 
org.apache.catalina.session.StandardManager.unload(StandardManager.java:320)
        at 
org.apache.catalina.session.StandardManager.stopInternal(StandardManager.java:487)
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
        at 
org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5386)
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
        at 
org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1425)
        at 
org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1414)
        ... 4 more

21-May-2015 09:40:56.228 SEVERE [localhost-startStop-1] 
org.apache.catalina.session.StandardManager.startInternal Exception loading 
sessions from persistent storage
 java.io.WriteAbortedException: writing aborted; 
java.io.NotSerializableException: 
org.apache.wiki.ui.progress.ProgressManager$JSONTracker
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1355)
        at 
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
        at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
        at java.util.HashMap.readObject(HashMap.java:1396)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at 
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)
        at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
        at 
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
        at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
        at 
org.apache.catalina.session.StandardSession.doReadObject(StandardSession.java:1634)
        at 
org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:1099)
        at 
org.apache.catalina.session.StandardManager.doLoad(StandardManager.java:261)
        at 
org.apache.catalina.session.StandardManager.load(StandardManager.java:180)
        at 
org.apache.catalina.session.StandardManager.startInternal(StandardManager.java:460)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at 
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5184)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at 
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
        at 
org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:945)
        at 
org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1768)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.NotSerializableException: 
org.apache.wiki.ui.progress.ProgressManager$JSONTracker
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
        at java.util.HashMap.internalWriteEntries(HashMap.java:1777)
        at java.util.HashMap.writeObject(HashMap.java:1354)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
        at 
org.apache.catalina.session.StandardSession.doWriteObject(StandardSession.java:1710)
        at 
org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:1116)
        at 
org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:401)
        at 
org.apache.catalina.session.StandardManager.unload(StandardManager.java:320)
        at 
org.apache.catalina.session.StandardManager.stopInternal(StandardManager.java:487)
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
        at 
org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5386)
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
        at 
org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1425)
        at 
org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1414)
        ... 4 more

log4j:WARN No appenders could be found for logger 
(org.apache.wiki.util.PropertyReader).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more 
info.
21-May-2015 09:40:59.588 INFO [localhost-startStop-1] 
org.apache.catalina.startup.HostConfig.deployWAR Deployment of web application 
archive /opt/programs/apache-tomcat-8.0.22/webapps/wiki.war has finished in 
13,073 ms
21-May-2015 09:40:59.590 INFO [localhost-startStop-1] 
org.apache.catalina.startup.HostConfig.deployDirectory Deploying web 
application directory /opt/programs/apache-tomcat-8.0.22/webapps/manager
21-May-2015 09:40:59.635 INFO [localhost-startStop-1] 
org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web 
application directory /opt/programs/apache-tomcat-8.0.22/webapps/manager has 
finished in 46 ms
21-May-2015 09:40:59.636 INFO [localhost-startStop-1] 
org.apache.catalina.startup.HostConfig.deployDirectory Deploying web 
application directory /opt/programs/apache-tomcat-8.0.22/webapps/examples
21-May-2015 09:40:59.821 INFO [localhost-startStop-1] 
org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web 
application directory /opt/programs/apache-tomcat-8.0.22/webapps/examples has 
finished in 185 ms
21-May-2015 09:40:59.821 INFO [localhost-startStop-1] 
org.apache.catalina.startup.HostConfig.deployDirectory Deploying web 
application directory /opt/programs/apache-tomcat-8.0.22/webapps/docs
21-May-2015 09:40:59.839 INFO [localhost-startStop-1] 
org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web 
application directory /opt/programs/apache-tomcat-8.0.22/webapps/docs has 
finished in 18 ms
21-May-2015 09:40:59.839 INFO [localhost-startStop-1] 
org.apache.catalina.startup.HostConfig.deployDirectory Deploying web 
application directory /opt/programs/apache-tomcat-8.0.22/webapps/host-manager
21-May-2015 09:40:59.853 INFO [localhost-startStop-1] 
org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web 
application directory /opt/programs/apache-tomcat-8.0.22/webapps/host-manager 
has finished in 14 ms
21-May-2015 09:40:59.854 INFO [localhost-startStop-1] 
org.apache.catalina.startup.HostConfig.deployDirectory Deploying web 
application directory /opt/programs/apache-tomcat-8.0.22/webapps/ROOT
21-May-2015 09:40:59.869 INFO [localhost-startStop-1] 
org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web 
application directory /opt/programs/apache-tomcat-8.0.22/webapps/ROOT has 
finished in 15 ms
21-May-2015 09:40:59.882 INFO [main] org.apache.coyote.AbstractProtocol.start 
Starting ProtocolHandler ["http-nio-8077"]
21-May-2015 09:40:59.899 INFO [main] org.apache.coyote.AbstractProtocol.start 
Starting ProtocolHandler ["ajp-nio-8011"]
21-May-2015 09:40:59.901 INFO [main] org.apache.catalina.startup.Catalina.start 
Server startup in 13433 ms

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