TreeCacheAop, Maps and persistence

[motormind]

Hi there,

Would it be possible to but a HashMap as the top-root in a TreeCacheAop and then see if entries are added, deleted or changed? I tried it but not much happens.

I also don't get any persistence anymore. I simply use the same configuration-file that I used with the normal Treecache, only updated for the TreeCacheAop. Are there any special issues I shoud look out for?

[ben.wang]

Yes, it should be possibe. Here is the code snippet (you can read it more in docs.jboss.com).

Map map = new HashMap();
cache.putObject(fqn, map);
// get the proxy
Map proxy = cache.getObject(fqn);
proxy.put(key, val); // Will show up in the cache store.

For persistence, it should work as well.

-Ben

[motormind]

Weird. I thought that you could simply treat objects in the cache as if they were not stored.

Anyway, now I do get this error message:

java.lang.RuntimeException: InternalDelegate.incrementRefCount(): REF_COUNT for reference counting is null at: /feeds/12346/missions/0/scs/0/units/0

I can't figure out what could cause this. Any insights?

[brian.stansberry]

Weird. I thought that you could simply treat objects in the cache as if they were not stored.

For every rule there is an exception ;-) In this case, we treat Map, List and Set specially; when such a collection is put into the cache the cache creates a proxy that implements the relevant interface. In the case of a collection that is an internal member of an object that is put in the cache, this is transparent to the user, but if you are storing the Map directly you need to get a reference to the proxy before you start operating on it.

Not sure about your REF_COUNT issue; can you post more details (i.e. more of the stack trace, what your code was doing when it happened), or even better send me an e-mail with a small test case?

[motormind]

Well, I sent you an email with the stacktrace. Could it be that maps and lists in the cache may not be null?

[brian.stansberry]

It might be a couple days before I can look at this. If you post your stack trace to this forum thread, maybe someone else will spot something in the meantime :)

[motormind]

Okay, here comes:

java.lang.reflect.InvocationTargetException
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at
org.jboss.cache.aop.CollectionInterceptorUtil.invoke(CollectionInterceptorUtil.java:100)
 at
org.jboss.cache.aop.CachedMapInterceptor.invoke(CachedMapInterceptor.java:48)
 at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:66)
 at AOPClassProxy$0.put(AOPClassProxy$0.java)
 at nl.mindef.c2sc.titaan.tbl.server.TblServerRmt.addCyrusMessage(Unknown
Source)
 at
nl.mindef.c2sc.titaan.tbl.server.process.cyrusimport.CyrusImportProcess.distributeInternal(Unknown
Source)
 at
nl.mindef.c2sc.titaan.tbl.server.process.cyrusimport.CyrusImportProcess.receivedMessage(Unknown
Source)
 at
nl.mindef.c2sc.titaan.tbl.server.process.cyrusimport.CyrusImportProcess$CyrusListener.socketMessageReceived(Unknown
Source)
 at nl.mindef.c2sc.titaan.tbl.server.communication.SocketHandler.run(Unknown
Source)
 at java.lang.Thread.run(Unknown Source)
Caused by: org.jboss.util.NestedRuntimeException: TreeCacheAop.putObject(): ; -
nested throwable: (java.lang.RuntimeException:
InternalDelegate.incrementRefCount(): REF_COUNT for reference counting is null
at: /feeds/12346/missions/0/scs/0/units/0); - nested throwable:
(org.jboss.util.NestedRuntimeException: TreeCacheAop.putObject(): ; - nested
throwable: (java.lang.RuntimeException: InternalDelegate.incrementRefCount():
REF_COUNT for reference counting is null at:
/feeds/12346/missions/0/scs/0/units/0))
 at org.jboss.cache.aop.CachedMapInterceptor.put(CachedMapInterceptor.java:79)
 ... 14 moreCACHE: node removed: /feeds/12346/missions/0/scs/0/units/0
Caused by: org.jboss.util.NestedRuntimeException: TreeCacheAop.putObject(): ; -
nested throwable: (java.lang.RuntimeException:
InternalDelegate.incrementRefCount(): REF_COUNT for reference counting is null
at: /feeds/12346/missions/0/scs/0/units/0)
 at org.jboss.cache.aop.TreeCacheAop.putObject(TreeCacheAop.java:270)
 at org.jboss.cache.aop.CachedMapInterceptor.put(CachedMapInterceptor.java:77)
 ... 14 more
Caused by: java.lang.RuntimeException: InternalDelegate.incrementRefCount():
REF_COUNT for reference counting is null at:
/feeds/12346/missions/0/scs/0/units/0
 at
org.jboss.cache.aop.InternalDelegate.incrementRefCount(InternalDelegate.java:73)
 at
org.jboss.cache.aop.TreeCacheAopDelegate.addRefFqn(TreeCacheAopDelegate.java:592)
 at
org.jboss.cache.aop.TreeCacheAopDelegate.handleCircularReference(TreeCacheAopDelegate.java:464)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._putObject(TreeCacheAopDelegate.java:168)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._regularPutObject(TreeCacheAopDelegate.java:229)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._putObject(TreeCacheAopDelegate.java:175)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._collectionPutObject(TreeCacheAopDelegate.java:311)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._putObject(TreeCacheAopDelegate.java:182)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._regularPutObject(TreeCacheAopDelegate.java:229)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._putObject(TreeCacheAopDelegate.java:175)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._collectionPutObject(TreeCacheAopDelegate.java:311)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._putObject(TreeCacheAopDelegate.java:182)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._regularPutObject(TreeCacheAopDelegate.java:229)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._putObject(TreeCacheAopDelegate.java:175)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._collectionPutObject(TreeCacheAopDelegate.java:311)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._putObject(TreeCacheAopDelegate.java:182)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._regularPutObject(TreeCacheAopDelegate.java:229)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._putObject(TreeCacheAopDelegate.java:175)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._collectionPutObject(TreeCacheAopDelegate.java:311)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._putObject(TreeCacheAopDelegate.java:182)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._regularPutObject(TreeCacheAopDelegate.java:229)
 at
org.jboss.cache.aop.TreeCacheAopDelegate._putObject(TreeCacheAopDelegate.java:175)
 at org.jboss.cache.aop.TreeCacheAop._putObject(TreeCacheAop.java:376)
 at org.jboss.cache.aop.TreeCacheAop.putObject(TreeCacheAop.java:255)

[brian.stansberry]

Thanks! If someone else has a similar problem this may help them find the forum entry as well.

BTW, what version of JBossCache are you using?

[motormind]

I'm using version 1.2.3

[ben.wang]

1. Is this re-producible every time?

2. can you try out 1.2.4beta? It has a new object graph model.

Thanks,

-Ben

[motormind]

I tried the beta and problem seems to be solved tiah that one. The problem thouogh is that I am now allowed to use betas in development, let alone production.

[ben.wang]

Wait for 1.2.4 release then. It should come out next week or so.

-Ben