Hello everyone!
I use CAS 4.0.0 in a cluster of 2 nodes. I configured the ticket registry using
EhCache, as described here:
http://jasig.github.io/cas/4.0.0/installation/Ehcache-Ticket-Registry.html
I have disk overflow set to true:
<bean id="abstractTicketCache" abstract="true"
class="org.springframework.cache.ehcache.EhCacheFactoryBean"
p:cacheManager-ref="cacheManager"
p:diskExpiryThreadIntervalSeconds="0"
p:diskPersistent="false"
p:eternal="false"
p:maxElementsInMemory="10000"
p:maxElementsOnDisk="20000"
p:memoryStoreEvictionPolicy="LRU"
p:overflowToDisk="true"
p:bootstrapCacheLoader-ref="ticketCacheBootstrapCacheLoader" />
<bean id="serviceTicketsCache"
class="org.springframework.cache.ehcache.EhCacheFactoryBean"
parent="abstractTicketCache"
p:cacheName="cas_st"
p:timeToIdle="0"
p:timeToLive="300"
p:cacheEventListeners-ref="serviceTicketRMISynchronousCacheReplicator" />
My problem is that from time to time, I get an error when the ticket registry
decides to save tickets (STs or TGTs) to disk. An exception is logged in the
log, saying that net.sf.ehcache.Cache is not serializable (which is true). Here
is an example of the exception:
2014-10-09 10:18:59,266 ERROR [net.sf.ehcache.store.disk.DiskStorageFactory] -
<Disk Write of ST-18-sE417I7BTdfhABdhRMNQ-idc-cas-4 failed: >
java.io.NotSerializableException: net.sf.ehcache.Cache
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1180)
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.defaultWriteFields(ObjectOutputStream.java:1528)
at
java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:438)
at net.sf.ehcache.Element.writeObject(Element.java:851)
at sun.reflect.GeneratedMethodAccessor138.invoke(Unknown Source)
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.writeObject(ObjectOutputStream.java:346)
at
net.sf.ehcache.util.MemoryEfficientByteArrayOutputStream.serialize(MemoryEfficientByteArrayOutputStream.java:97)
at
net.sf.ehcache.store.disk.DiskStorageFactory.serializeElement(DiskStorageFactory.java:399)
at
net.sf.ehcache.store.disk.DiskStorageFactory.write(DiskStorageFactory.java:381)
at
net.sf.ehcache.store.disk.DiskStorageFactory$DiskWriteTask.call(DiskStorageFactory.java:473)
at
net.sf.ehcache.store.disk.DiskStorageFactory$PersistentDiskWriteTask.call(DiskStorageFactory.java:1067)
at
net.sf.ehcache.store.disk.DiskStorageFactory$PersistentDiskWriteTask.call(DiskStorageFactory.java:1051)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
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)
Has anybody experienced a similar error? I searched on the Internet but did not
find any relevant report.
It seems that CAS tickets indirectly reference the cache which causes Java
runtime to try to serialize it too. Unfortunately I haven't found the path from
tickets to caches yet.
A quick workaround would be to set disk overflow to false, I believe, but I'd
like to keep it switched on to be able handle bigger loads.
Any help or hint would be much appreciated!
Best Regards,
Jarda
--------------------------------------------------
Jaroslav Kačer
IDC | Application Developer
Phone: +420723914123
Mail: [email protected]
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