[jboss-user] [JBossCache] - Problem reading (deserializing) objects from FileCacheLoader

[arjan]

Hi,

I can't seem to get it working.. I'm running JBossCache on a default JBoss4.0.5 installation (JDK 1.5). I've configured JBossCache as a service (deploy/treecache-service.xml). For each deployed webapp a separate ClassLoader is instantiated, so I have to register a ClassLoader for a section of the TreeCache (see below).

The problem is that once objects are serialized to the file cache, they can't be de-serialized (unmarshalled).

I'm getting stack traces like this:


  | java.lang.ClassNotFoundException: No ClassLoaders found for: nl.yirdis.monet.chart.ChartMetadata
  |         at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:212)
  |         at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:514)
  |         at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:408)
  |         at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
  |         at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
  |         at java.lang.Class.forName0(Native Method)
  |         at java.lang.Class.forName(Class.java:242)
  |         at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:584)
  |         at org.jboss.invocation.MarshalledValueInputStream.resolveClass(MarshalledValueInputStream.java:109)
  |         at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1543)
  |         at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1465)
  |         at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1698)
  |         at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1304)
  |         at java.io.ObjectInputStream.readObject(ObjectInputStream.java:349)
  |         at java.util.HashMap.readObject(HashMap.java:1013)
  |         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  |         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  |         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  |         at java.lang.reflect.Method.invoke(Method.java:585)
  |         at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946)
  |         at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1818)
  |         at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1718)
  |         at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1304)
  |         at java.io.ObjectInputStream.readObject(ObjectInputStream.java:349)
  |         at org.jboss.cache.loader.FileCacheLoader.loadAttributes(FileCacheLoader.java:486)
  |         at org.jboss.cache.loader.FileCacheLoader.get(FileCacheLoader.java:136)
  |         at org.jboss.cache.interceptors.CacheLoaderInterceptor.loadData(CacheLoaderInterceptor.java:443)
  |         at org.jboss.cache.interceptors.CacheLoaderInterceptor.loadNode(CacheLoaderInterceptor.java:353)
  |         at org.jboss.cache.interceptors.CacheLoaderInterceptor.invoke(CacheLoaderInterceptor.java:180)
  |         at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)
  |         at org.jboss.cache.interceptors.UnlockInterceptor.invoke(UnlockInterceptor.java:32)
  | 

In my treecache configuration I've enabled RegionBasedMarshalling and InactiveOnStartup, as described in the user guide:


  |     <attribute name="UseRegionBasedMarshalling">true</attribute>
  |     <attribute name="InactiveOnStartup">true</attribute>
  | 

The region is configured like this:


  |         <region name="/nl/yirdis/monet/charts">
  |           <attribute name="maxNodes">1000</attribute>
  |           <attribute name="timeToLiveSeconds">86400</attribute>
  |           <attribute name="maxAgeSeconds">86400</attribute>
  |         </region>
  | 

In my code (using Spring), I've set the ClassLoader for that region to the Classloader of the webapp:


  |     public void afterPropertiesSet() throws Exception {
  |             treeCache.registerClassLoader("/nl/yirdis/monet/charts/", ChartMetadata.class.getClassLoader());
  |             treeCache.activateRegion("/nl/yirdis/monet/charts/");
  |     }
  | 

(ChartMetadata is a class containing the serialized stuff. It implements the Serializable interface).

Deactivation on undeployment of the webapp is done likewise, as stated in the docs.

Where did I go wrong? What's causing the TreeCache (FileCacheLoader) to  cause class loading errors?


Regards,

Arjan


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