Third message of the day. I'm getting paranoic :D
OM 4.0.10, openjdk 11, ubuntu 18.04
I'm getting this too, but I don't know neither the effect nor the cause:
[ERROR] [Wicket-AsyncPageStore-PageSavingThread]
org.apache.wicket.serialize.java.JavaSerializer - error writing object
[Page class = org.apache.openmeetings.web.pages.HashPage, id = 0, render
count = 1]: null
java.util.ConcurrentModificationException: null
at java.base/java.util.ArrayList.writeObject(ArrayList.java:900)
at
java.base/jdk.internal.reflect.GeneratedMethodAccessor185.invoke(Unknown
Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
at java.base/java.util.ArrayList.writeObject(ArrayList.java:896)
at
java.base/jdk.internal.reflect.GeneratedMethodAccessor185.invoke(Unknown
Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
at java.base/java.util.ArrayList.writeObject(ArrayList.java:896)
at
java.base/jdk.internal.reflect.GeneratedMethodAccessor185.invoke(Unknown
Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
at java.base/java.util.ArrayList.writeObject(ArrayList.java:896)
at
java.base/jdk.internal.reflect.GeneratedMethodAccessor185.invoke(Unknown
Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
at java.base/java.util.ArrayList.writeObject(ArrayList.java:896)
at
java.base/jdk.internal.reflect.GeneratedMethodAccessor185.invoke(Unknown
Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
at java.base/java.util.ArrayList.writeObject(ArrayList.java:896)
at
java.base/jdk.internal.reflect.GeneratedMethodAccessor185.invoke(Unknown
Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
at
org.apache.wicket.serialize.java.JavaSerializer$SerializationCheckerObjectOutputStream.writeObjectOverride(JavaSerializer.java:368)
at
java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:345)
at
org.apache.wicket.serialize.java.JavaSerializer.serialize(JavaSerializer.java:82)
at
org.apache.wicket.pageStore.AbstractPageStore.serializePage(AbstractPageStore.java:133)
at
org.apache.wicket.pageStore.DefaultPageStore.createSerializedPage(DefaultPageStore.java:281)
at
org.apache.wicket.pageStore.DefaultPageStore.storePage(DefaultPageStore.java:61)
at
org.apache.wicket.pageStore.AsynchronousPageStore$PageSavingRunnable.run(AsynchronousPageStore.java:208)
at java.base/java.lang.Thread.run(Thread.java:834)
[ERROR] [Wicket-AsyncPageStore-PageSavingThread]
org.apache.wicket.serialize.java.JavaSerializer - Error serializing object
class org.apache.openmeetings.web.pages.HashPage [object=[Page class =
org.apache.openmeetings.web.pages.HashPage, id = 0, render count = 1]]
org.apache.wicket.WicketRuntimeException:
java.util.ConcurrentModificationException
at
org.apache.wicket.serialize.java.JavaSerializer$SerializationCheckerObjectOutputStream.writeObjectOverride(JavaSerializer.java:402)
at
java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:345)
at
org.apache.wicket.serialize.java.JavaSerializer.serialize(JavaSerializer.java:82)
at
org.apache.wicket.pageStore.AbstractPageStore.serializePage(AbstractPageStore.java:133)
at
org.apache.wicket.pageStore.DefaultPageStore.createSerializedPage(DefaultPageStore.java:281)
at
org.apache.wicket.pageStore.DefaultPageStore.storePage(DefaultPageStore.java:61)
at
org.apache.wicket.pageStore.AsynchronousPageStore$PageSavingRunnable.run(AsynchronousPageStore.java:208)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.util.ConcurrentModificationException: null
at java.base/java.util.ArrayList.writeObject(ArrayList.java:900)
at
java.base/jdk.internal.reflect.GeneratedMethodAccessor185.invoke(Unknown
Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
at java.base/java.util.ArrayList.writeObject(ArrayList.java:896)
at
java.base/jdk.internal.reflect.GeneratedMethodAccessor185.invoke(Unknown
Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
at java.base/java.util.ArrayList.writeObject(ArrayList.java:896)
at
java.base/jdk.internal.reflect.GeneratedMethodAccessor185.invoke(Unknown
Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
at java.base/java.util.ArrayList.writeObject(ArrayList.java:896)
at
java.base/jdk.internal.reflect.GeneratedMethodAccessor185.invoke(Unknown
Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
at java.base/java.util.ArrayList.writeObject(ArrayList.java:896)
at
java.base/jdk.internal.reflect.GeneratedMethodAccessor185.invoke(Unknown
Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
at java.base/java.util.ArrayList.writeObject(ArrayList.java:896)
at
java.base/jdk.internal.reflect.GeneratedMethodAccessor185.invoke(Unknown
Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at
java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
at
org.apache.wicket.serialize.java.JavaSerializer$SerializationCheckerObjectOutputStream.writeObjectOverride(JavaSerializer.java:368)
Thanks.
