[jboss-user] [JBossCache] - Exception thrown when calling remove during after-completion

[rworsnop]

JBoss Cache version: 1.4.1.SP2

I have been having some problems using Hibernate with JBoss Cache in optimistic locking mode. During the after-completion phase of the transaction, Hibernate will, in certain circumstances, call TreeCache.remove.

This causes problems because JBoss Cache sees that the transaction is committing. A CacheException is thrown, with a "Must be in a valid transaction" message.

The code below replicates what Hibernate does:
	public static void main(String[] args) throws Exception {
  | 		TreeCache tree = new TreeCache();
  | 		tree.setTransactionManagerLookup(new DummyTransactionManagerLookup());
  | 		tree.setCacheMode(TreeCache.LOCAL);
  | 		tree.setNodeLockingScheme("optimistic");
  | 		tree.startService(); // kick start tree cache
  | 		TransactionManager txManager = DummyTransactionManager.getInstance();
  | 
  | 		try {
  | 			txManager.begin();
  | 			txManager.getTransaction().registerSynchronization(remover(tree));
  | 			tree.put(fqn("custard"), "item", 45);
  | 			txManager.commit();
  | 		}
  | 		catch(Throwable ex) {
  | 			ex.printStackTrace();
  | 		   try { txManager.rollback(); } catch(Throwable t) {}
  | 		} finally{
  | 			tree.stopService();
  | 		}
  | 	}
  | 	
  | 	private static Synchronization remover(final TreeCache tree) {
  | 		return new Synchronization(){
  | 
  | 			public void afterCompletion(int status) {
  | 				try {
  | 					tree.remove(fqn("custard"), option(false));
  | 				} catch (CacheException e) {
  | 					System.err.println("Bad things happened when I tried to remove custard");
  | 					e.printStackTrace();
  | 				}
  | 			}
  | 			public void beforeCompletion() {
  | 			}
  | 			
  | 		};
  | 	}
  | 
  | 	private static Fqn fqn(String s){
  | 		return Fqn.fromString(s);
  | 	}
  | 	
  | 	private static Option option(boolean failSilently){
  | 		   Option option = new Option();
  | 			option.setFailSilently( failSilently );
  | 			option.setDataVersion(new DataVersion(){
  | 
  | 				public boolean newerThan(DataVersion arg0) {
  | 					return false;
  | 				}} );
  | 			return option;
  | 	}

It causes this exception:
Bad things happened when I tried to remove custard
  | org.jboss.cache.CacheException: Must be in a valid transaction _remove; id:5(null, /custard, true)
  | 	at org.jboss.cache.interceptors.OptimisticNodeInterceptor.invoke(OptimisticNodeInterceptor.java:66)
  | 	at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)
  | 	at org.jboss.cache.interceptors.OptimisticCreateIfNotExistsInterceptor.invoke(OptimisticCreateIfNotExistsInterceptor.java:69)
  | 	at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)
  | 	at org.jboss.cache.interceptors.OptimisticValidatorInterceptor.invoke(OptimisticValidatorInterceptor.java:84)
  | 	at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)
  | 	at org.jboss.cache.interceptors.OptimisticLockingInterceptor.invoke(OptimisticLockingInterceptor.java:126)
  | 	at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)
  | 	at org.jboss.cache.interceptors.TxInterceptor.handleNonTxMethod(TxInterceptor.java:365)
  | 	at org.jboss.cache.interceptors.TxInterceptor.invoke(TxInterceptor.java:160)
  | 	at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)
  | 	at org.jboss.cache.interceptors.CacheMgmtInterceptor.invoke(CacheMgmtInterceptor.java:183)
  | 	at org.jboss.cache.TreeCache.invokeMethod(TreeCache.java:5776)
  | 	at org.jboss.cache.TreeCache.remove(TreeCache.java:3855)
  | 	at org.jboss.cache.TreeCache.remove(TreeCache.java:3438)
  | 	at com.medq.test.TestTreeCacheNotInTransaction$1.afterCompletion(TestTreeCacheNotInTransaction.java:47)
  | 	at org.jboss.cache.transaction.DummyTransaction.notifyAfterCompletion(DummyTransaction.java:270)
  | 	at org.jboss.cache.transaction.DummyTransaction.commit(DummyTransaction.java:64)
  | 	at org.jboss.cache.transaction.DummyBaseTransactionManager.commit(DummyBaseTransactionManager.java:61)
  | 	at com.medq.test.TestTreeCacheNotInTransaction.main(TestTreeCacheNotInTransaction.java:32)
  | 

Is this expected behaviour for JBoss Cache? If so I will raise the issue on the Hibernate forum.

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