[jboss-user] [JBossCache] - Possible Memory Leak? (1.4 SP7)

[slattery]

Hi all,
I'm running a test program with a simple loop that writes an object to the cache and then removes it.
As I monitor with JConsole, the heap usage grows and grows and can't be reclaimed with a garbage collection. Eventually it crashes with an OutOfMemoryError.

Below is my code.
MemoryLeakTest.java:

  | package test;
  | 
  | import static java.lang.System.out;
  | 
  | import org.jboss.cache.PropertyConfigurator;
  | import org.jboss.cache.aop.PojoCache;
  | 
  | public class MemoryLeakTest {
  | 
  | 	static PojoCache cache;
  | 	
  | 	public static void cacheInit() throws Exception {
  | 		cache = new PojoCache();
  | 		PropertyConfigurator config = new PropertyConfigurator();
  | 		config.configure(cache, "replSync-service.xml");
  | 		cache.start();
  | 	}
  | 
  | 	
  | 	public static void main(String[] args) throws Exception {
  | 		cacheInit();
  | 		
  | 		final int MAX = 1000000;
  | 		final int INNER_MAX = 2;
  | 		final int DEPTH = 0;
  | 		
  | 		out.println("Adding to cache...");
  | 		for (Integer i=0; i<MAX; i++) {
  | 			String fqn = "/" + i;
  | 			if (i % 100 == 0) out.println(" putting at: " + fqn);
  | 			
  | 			for (int j=0; j<INNER_MAX; j++) {
  | 				cache.putObject(fqn+"/"+j, new DummyObject(DEPTH));
  | 			}
  | 			
  | 			for (int j=0; j<INNER_MAX; j++) {
  | 				cache.removeObject(fqn+"/"+j);
  | 				cache.remove(fqn+"/"+j);
  | 			}
  | 
  | 		}
  | 		
  | 		cacheStop();
  | 	}
  | 	
  | 	public static void cacheStop() {
  | 		cache.stop();
  | 		cache.destroy();
  | 	}
  | }
  | 
  | 

DummyObject.java:

  | package test;
  | 
  | import java.util.ArrayList;
  | import java.util.List;
  | import java.util.Random;
  | 
  | public class DummyObject {
  | 	static Random random = new Random();
  | 	
  | 	byte[] data;
  | 	List<DummyObject> children = new ArrayList<DummyObject>();
  | 	
  | 	
  | 	public DummyObject(int depth) {
  | 		this.data = new byte[100];
  | 		
  | 		if (depth > 0) {
  | 			int nextDepth = depth - 1;
  | 			children.add(new DummyObject(nextDepth));
  | 			children.add(new DummyObject(nextDepth));
  | 		}
  | 	}
  | 
  | 	private String generateRandomData() {
  | 		StringBuilder sb = new StringBuilder();
  | 		for (int i=0; i<1000; i++)
  | 			sb.append(random.nextLong());
  | 		
  | 		return sb.toString();
  | 	}
  | }
  | 

replSync-service.xml:


  | <?xml version="1.0" encoding="UTF-8"?>
  | <server>
  |     <classpath codebase="./lib" archives="jboss-cache.jar, jgroups.jar"/>
  |     <mbean code="org.jboss.cache.TreeCache" name="jboss.cache:service=TreeCache">
  | 
  |         <depends>jboss:service=Naming</depends>
  |         <depends>jboss:service=TransactionManager</depends>
  | 
  |         <attribute name="TransactionManagerLookupClass">org.jboss.cache.DummyTransactionManagerLookup</attribute>
  |         <attribute name="IsolationLevel">REPEATABLE_READ</attribute>
  |         <attribute name="CacheMode">REPL_SYNC</attribute>
  |         <attribute name="UseReplQueue">false</attribute>
  |         <attribute name="ReplQueueInterval">0</attribute>
  |         <attribute name="ReplQueueMaxElements">0</attribute>
  |         <attribute name="ClusterName">TreeCache-Cluster</attribute>
  | 
  |         <attribute name="ClusterConfig">
  |             <config>
  |                 <UDP mcast_addr="228.1.2.3" mcast_port="58866"
  |                     ip_ttl="64" ip_mcast="true" 
  |                     mcast_send_buf_size="150000" mcast_recv_buf_size="80000"
  |                     ucast_send_buf_size="150000" ucast_recv_buf_size="80000"
  |                     loopback="false"/>
  |                 <PING timeout="2000" num_initial_members="3"
  |                     up_thread="false" down_thread="false"/>
  |                 <MERGE2 min_interval="10000" max_interval="20000"/>
  |                 <FD_SOCK/>
  |                 <VERIFY_SUSPECT timeout="1500"
  |                     up_thread="false" down_thread="false"/>
  |                 <pbcast.NAKACK gc_lag="50" retransmit_timeout="600,1200,2400,4800"
  |                     max_xmit_size="8192" up_thread="false" down_thread="false"/>
  |                 <UNICAST timeout="600,1200,2400" window_size="100" min_threshold="10"
  |                     down_thread="false"/>
  |                 <pbcast.STABLE desired_avg_gossip="20000"
  |                     up_thread="false" down_thread="false"/>
  |                 <FRAG frag_size="8192"
  |                     down_thread="false" up_thread="false"/>
  |                 <pbcast.GMS join_timeout="5000" join_retry_timeout="2000"
  |                     shun="true" print_local_addr="true"/>
  |                 <pbcast.STATE_TRANSFER up_thread="true" down_thread="true"/>
  |             </config>
  |         </attribute>
  | 
  |         <attribute name="FetchInMemoryState">true</attribute>
  |         <attribute name="InitialStateRetrievalTimeout">15000</attribute>
  |         <attribute name="SyncReplTimeout">15000</attribute>
  |         <attribute name="LockAcquisitionTimeout">10000</attribute>
  |         <attribute name="EvictionPolicyClass"></attribute>
  |         <attribute name="UseRegionBasedMarshalling">true</attribute>
  |     </mbean>
  | 
  | </server>
  | 

jboss-aop.xml contains:

  | <?xml version="1.0" encoding="UTF-8"?>
  | <aop>
  |   <prepare expr="field(* test.DummyObject->*)" />
  | </aop>
  | 

I launch MemoryLeakTest with these VM parameters:
-Dcom.sun.management.jmxremote -javaagent:.\lib\jboss-aop-jdk50.jar -Djboss.aop.path=.\resources\pojocache-aop.xml -Djboss.aop.path=.\resources\jboss-aop.xml -Xms128M -Xmx128M

Is there anything obvious I might be doing wrong here?

Thanks!

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