EvictionPolicyConfig throwing null pointer exceptions in 1.2

[newton]

I''ve seen people asking about similar problems in this other forum posts, and it usually seems to be due to them using the wrong attribute names. As far as I can tell, I am using the right attribute names and my config is complete. I am running jboss-1.2.3. I'd like look in the source and see what exactly is causing this, but oddly I can't find the source for this open source software online anywhere.

Here is my config:

attribute name="EvictionPolicyClass" org.jboss.cache.eviction.LRUPolicy /attribute
attribute name="EvictionPolicyConfig"
config
attribute name="wakeUpIntervalSeconds" 60 /attribute
region name="/Bad"
attribute name="maxNodes" 5000 /attribute
attribute name="timeToLiveSeconds" 60 /attribute
/region
/config
/attribute

And here is my error:
Caused by: java.lang.NullPointerException
at org.jboss.cache.eviction.LRUPolicy.nodeAdded(LRUPolicy.java:55)
at org.jboss.cache.eviction.LRUPolicy.nodeCreated(LRUPolicy.java:93)
at org.jboss.cache.TreeCache.notifyNodeCreated(TreeCache.java:3167)
at org.jboss.cache.interceptors.LockInterceptor.lock(LockInterceptor.java:221)
at org.jboss.cache.interceptors.LockInterceptor.invoke(LockInterceptor.java:153)
at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:41)
at org.jboss.cache.interceptors.CacheStoreInterceptor.invoke(CacheStoreInterceptor.java:104)
at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:41)
at org.jboss.cache.interceptors.CacheLoaderInterceptor.invoke(CacheLoaderInterceptor.java:120)
at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:41)
at org.jboss.cache.interceptors.UnlockInterceptor.invoke(UnlockInterceptor.java:35)
at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:41)
at org.jboss.cache.interceptors.ReplicationInterceptor.invoke(ReplicationInterceptor.java:54)
at org.jboss.cache.TreeCache.invokeMethod(TreeCache.java:3116)

I also see this in the log: 2005-07-15 19:13:37,197 INFO [main] org.jboss.cache.TreeCache setEvictionPolicyConfig (TreeCache.java:633) - setEvictionPolicyConfig(): [config: null]

[belaban]

The source can be obtained from here: http://wiki.jboss.org/wiki/Wiki.jsp?page=CVSRepository.

For JBossCache 1.2.3, committer access checkout would be (anonymous is similar):

cvs -d:ext:[e-mail]:/cvsroot/jboss co -r JBCACHE_1_2_3 JBossCache

We will release src on top of binary versions in the future, so people don't have to checkout the src from the repo.

[ben.wang]

Hmmn! Looking at the source code, it points to a null region that can possibly causing the NPE. However, it should have _DEFAULT_ region though.

Please keep me posted on your finding.

-Ben

[newton]

I figured this out... if you have an eviction policy but you leave a region unconfigured, a null pointer exception will be thrown when you get or put in that region.

Since I had no "/_default_" region configured, the only part of my cache that was working was the one I configured for the eviction policy.

You should make that configuration requirement explicit, or better yet, apply NO eviction policy on regions where they aren't specified - that was the behaviour I was expecting.

M.

[ben.wang]

No, I can't. If I have a default region, what is the default values for maxNodes and timeToLiveSeconds? User will get a big surprise.

What I can do though is adding a checking for default region. If it is not configured, I will throw a runtime exception. It has been checked in the code and will appear in 1.2.4.

Thanks,

-Ben