问题
I am working on one application using EJB1.2. previously running fine but from past few days I am getting following exception
Exception in ejbLoad:: weblogic.ejb20.cache.CacheFullException: size=85783, target=5000, incr=1 at weblogic.ejb20.cache.EntityCache$SizeTracker.shrinkNext(JI)Lweblogic.ejb20.cache.EntityCache$MRUElement;(EntityCache.java:438) at weblogic.ejb20.cache.EntityCache.put
(Ljavax.transaction.Transaction;Lweblogic.ejb20.cache.CacheKey;Ljavax.ejb.EntityBean;Lweblogic.ejb20.interfaces.CachingManager;)V(EntityCache.java:141) at weblogic.ejb20.manager.DBManager.getReadyBean(Ljavax.transaction.Transaction;Ljava.lang.Object;)Ljavax.ejb.EntityBean;(DBManager.java:332) at
weblogic.ejb20.manager.DBManager.preInvoke(Lweblogic.ejb20.internal.InvocationWrapper;)Ljavax.ejb.EnterpriseBean;(DBManager.java:249) at
weblogic.ejb20.internal.BaseEJBLocalObject.preInvoke(Lweblogic.ejb20.internal.InvocationWrapper;)Lweblogic.ejb20.internal.InvocationWrapper;(BaseEJBLocalObject.java:228) at weblogic.ejb20.internal.EntityEJBLocalObject.preInvoke(Lweblogic.ejb20.internal.MethodDescriptor;Lweblogic.security.service.ContextHandler;)Lweblogic.ejb20.internal.InvocationWrapper;(EntityEJBLocalObject.java:72) at com.nextjet.enterprise.locationcode.locationcode.LocationCode_v2epgs_ELOImpl.getLocationCodeData()Lcom.nextjet.enterprise.locationcode.LocationCodeData;(LocationCode_v2epgs_ELOImpl.java:28) at com.nextjet.enterprise.locationcode.locationcodemanager.LocationCodeManagerBean.loadShippingAddress(Ljava.lang.Long;Ljava.lang.String;)Lcom.nextjet.enterprise.locationcode.LocationCodeView;(LocationCodeManagerBean.java:538) at com.nextjet.enterprise.locationcode.locationcodemanager.LocationCodeManagerBean.doSearchShippingAddresses(Ljava.lang.String;)Lcom.nextjet.enterprise.locationcode.LocationCodeSearchResult;(LocationCodeManagerBean.java:514) at com.nextjet.enterprise.locationcode.locationcodemanager.LocationCodeManagerBean.lookupAccountShipping.....
For now I am changing value of <max-beans-in-cache> in weblogic-ejb-jar.xml
I am changing the above value to <max-beans-in-cache>100000</max-beans-in-cache>
is it the only solution for this kind of exception or could there be a data related issue from database?
回答1:
10000 is quite a high value for max-beans-in-cache and from the log it seems the application tried to make a call for up to 85785 instances of the EJB.
I would suggest some refactoring in your code.
Your code is doing
com.nextjet.enterprise.locationcode.locationcode.LocationCode_v2epgs_ELOImpl
.getLocationCodeData()
Is this is mainly a read operation ? Or are you doing simultaneous writes and reads?
You could refactor this in 2 ways to reduce the EJB overheads if it is mainly doing read operations.
1) Read Oracle's recommendation on tuning the EJB settings and database options for concurrency, especially the Read-Mostly pattern
http://docs.oracle.com/cd/E13222_01/wls/docs81/ejb/entity.html#ChoosingaConcurrencyStrategy
2) If you are mainly doing reads - then dont use Entity EJBs at all. Use the FastLaneReader pattern which is using a direct JDBC call to fetch the data for SELECT, and you can do writes using the EJBs as at present. In this way, the max-beans-in-cache can be reduced
A very detailed example is given on the Sun Design Patterns site
http://java.sun.com/blueprints/patterns/FastLaneReader.html
来源：https://stackoverflow.com/questions/11882509/ejb-weblogic-ejb20-cache-cachefullexception