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Bug
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Resolution: Fixed
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Normal
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7.0.8, 8.0.2
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Security Level: Jimmy
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None
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ZK 8.0.3 S8, ZK 8.0.3 S9, ZK 8.0.3 S10
steps to reproduce
use a <chosenbox> in a cluster environment or in an appserver with enabled session serialization
(See debug info more isolated reproducing/testing_
actual result
An exception when session deserializaion occurs:
==> ../logs/catalina.out <==
25-Jul-2016 18:22:53.156 SEVERE [localhost-startStop-1] org.apache.catalina.session.StandardManager.startInternal Exception loading sessions from persistent storage
java.lang.NullPointerException
at org.zkoss.zk.ui.event.Events.postEvent(Events.java:415)
at org.zkoss.zk.ui.event.Events.postEvent(Events.java:466)
at org.zkoss.zk.ui.event.Events.postEvent(Events.java:397)
at org.zkoss.zkmax.zul.Chosenbox.postOnInitRender(Chosenbox.java:830)
at org.zkoss.zkmax.zul.Chosenbox.readObject(Chosenbox.java:914)
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:498)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1058)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1909)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1808)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:373)
at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)
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:498)
...
expected result
working deserialization - components should continue to work after session deserialization
debug info
To test this in isolation (without having to setup a clustering environment) the attached JUnit Test (TestComponentDeserialization.java
) reproduces the issue
For integration testing the issue also happens using a tomcat8 (default config)
configure zk session serialization in zk.xml:
<system-config>
<ui-factory-class>org.zkoss.zk.ui.http.SerializableUiFactory</ui-factory-class>
</system-config>
Loading a zul file containing <chosenbox>
shutdown tomcat
startup tomcat (watch the logs - NPE occurs)
root cause
Chosenbox is posting events during deserializaion which fails since there is no active Execution present (e.g. during server startup)
at org.zkoss.zk.ui.event.Events.postEvent(Events.java:397)
at org.zkoss.zkmax.zul.Chosenbox.postOnInitRender(Chosenbox.java:830)
at org.zkoss.zkmax.zul.Chosenbox.readObject(Chosenbox.java:914)
Workaround
Avoid using Chosenbox (other components should work)
or
conceptual idea: detach the component manually during sessionPassivation and create a new box and reattach it during sessionActivation (doesn't work, UUIDs are lost and other problems)
- clones
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ZK-3281 Error on Session replication on cluster environment
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- Closed
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