Possible Memory Leak? (1.4 SP7)
slattery Dec 3, 2007 5:01 PMHi 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!