CODEWITHSUNDEEP
hibernateehcache
Bookie
Bookie

Reputation: 93

Error locating Hibernate Session Factory in Terracotta configuration with EHCache

Can any one help me why below error message could appear on application server. I am trying to setup EHCache with Terracotta. Please suggest any clue why this message could appear.

[DEBUG][08/05/12 13:50:19.648][CacheByAmitNode8081] Running mbean initializer task for ehcache hibernate...
[DEBUG][08/05/12 13:50:19.766][CacheByAmitNode8081] Successfully registered bean
[ERROR][08/05/12 13:50:19.805][CacheByAmitNode8081] Error locating Hibernate Session Factory
java.lang.NullPointerException
    at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:36)
    at sun.reflect.UnsafeQualifiedObjectFieldAccessorImpl.get(UnsafeQualifiedObjectFieldAccessorImpl.java:20)
    at java.lang.reflect.Field.get(Field.java:358)
    at org.hibernate.cache.ehcache.management.impl.ProviderMBeanRegistrationHelper$RegisterMBeansTask.locateSessionFactory(ProviderMBeanRegistrationHelper.java:152)
    at org.hibernate.cache.ehcache.management.impl.ProviderMBeanRegistrationHelper$RegisterMBeansTask.run(ProviderMBeanRegistrationHelper.java:117)
    at java.util.TimerThread.mainLoop(Timer.java:512)
    at java.util.TimerThread.run(Timer.java:462)
[DEBUG][08/05/12 13:50:19.815][CacheByAmitNode8081] SessionFactory is probably still being initialized... waiting for it to complete before enabling hibernate statistics monitoring via JMX

Upvotes: 0

Views: 309

Answers (1)

bvella
bvella

Reputation: 41

I had this exact same problem today. This seems to be caused by a bug in the class ProviderMBeanRegistrationHelper at line 152

Map map = (Map) instancesField.get( null );

where in lines 146 and 147 we have

Class factoryType = SessionFactoryRegistry.class;
Field instancesField = getField( factoryType, "sessionFactoryMap" );

so we know that instanceField is a field from an instance of class SessionFactoryRegistry which just so happens to have a single instance that can be obtained statically from the class as 

SessionFactoryRegistry.INSTANCE

In conclusion, i modified line 152 as follows

Map map = (Map) instancesField.get( SessionFactoryRegistry.INSTANCE );

Compiled and replaced the class in the hibernate-ehcache jar file and the exception went away. I will file an issue about this.

Upvotes: 2

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