Get an error when accessing the entry from the Backing Map directly

Question

We are using some sample code from Oracle to access Objects associated via KeyAssociation directly from the Backing Map.
Occasionally we get the error posted below. Can someone shed light on what this error means ?
I'm doing a Get on the Backing Map directly.
Thanks,
J
An entry was inserted into the backing map for the partitioned cache "Customerl" that is not owned by this member; the entry will be removed.
ReadWriteBackingMap$5{ReadWriteBackingMap inserted: key=Binary(length=75, value=0x---binary key data removed ----), value=Binary(length=691, value=0x---binary value data removed---)), synthetic}
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$Storage.onBackingMapEvent(DistributedCache.CDB:152)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$Storage$PrimaryListener.entryInserted(DistributedCache.CDB:1)
     at com.tangosol.util.MapEvent.dispatch(MapEvent.java:191)
     at com.tangosol.util.MapEvent.dispatch(MapEvent.java:164)
     at com.tangosol.util.MapListenerSupport.fireEvent(MapListenerSupport.java:556)
     at com.tangosol.net.cache.ReadWriteBackingMap$InternalMapListener.dispatch(ReadWriteBackingMap.java:2064)
     at com.tangosol.net.cache.ReadWriteBackingMap$InternalMapListener.entryInserted(ReadWriteBackingMap.java:1903)
     at com.tangosol.util.MapEvent.dispatch(MapEvent.java:191)
     at com.tangosol.util.MapEvent.dispatch(MapEvent.java:164)
     at com.tangosol.util.MapListenerSupport.fireEvent(MapListenerSupport.java:556)
     at com.tangosol.net.cache.OldCache.dispatchEvent(OldCache.java:1718)
     at com.tangosol.net.cache.OldCache$Entry.onAdd(OldCache.java:1786)
     at com.tangosol.util.SafeHashMap.put(SafeHashMap.java:244)
     at com.tangosol.net.cache.OldCache.put(OldCache.java:253)
     at com.tangosol.net.cache.OldCache.put(OldCache.java:221)
     at com.tangosol.net.cache.ReadWriteBackingMap.get(ReadWriteBackingMap.java:721)
     at

Answer 1

Here is the sample we adapted. We have adapted the code below to our specific Cache. I have highlighted the line that throws the exception, this exception doesnt occur all the time, saw it about 10 times yesterday and 2 times today.
import com.tangosol.net.BackingMapManagerContext;
import com.tangosol.net.CacheFactory;
import com.tangosol.net.CacheService;
import com.tangosol.net.DefaultConfigurableCacheFactory;
import com.tangosol.net.NamedCache;
import com.tangosol.util.Binary;
import com.tangosol.util.ClassHelper;
import com.tangosol.util.InvocableMap;
import com.tangosol.util.processor.AbstractProcessor;
import java.io.Serializable;
import java.util.Map;
* dimitri
public class Main extends AbstractProcessor
public static class Foo implements Serializable
String m_sFoo;
public String getFoo()
return m_sFoo;
public void setFoo(String sFoo)
m_sFoo = sFoo;
public String toString()
return "Foo[foo=" + m_sFoo + "]";
public static class Bar implements Serializable
String m_sBar;
public String getBar()
return m_sBar;
public void setBar(String sBar)
m_sBar = sBar;
public String toString()
return "Bar[bar=" + m_sBar + "]";
public Object process(InvocableMap.Entry entry)
try
// We are invoked on foo - update it.
Foo foo = (Foo) entry.getValue();
foo.setFoo(foo.getFoo() + " updated");
entry.setValue(foo);
// Now update Bar
Object oStorage = ClassHelper.invoke(entry, "getStorage", null);
CacheService service = (CacheService) ClassHelper.invoke(oStorage, "getService", null);
DefaultConfigurableCacheFactory.Manager bmm =
(DefaultConfigurableCacheFactory.Manager) service.getBackingMapManager();
BackingMapManagerContext ctx = bmm.getContext();
Map mapBack = bmm.getBackingMap("bar");
// Assume that the key is still the same - "test"
Binary binKey = (Binary) ctx.getKeyToInternalConverter().convert(entry.getKey());
Binary binValue = (Binary) mapBack.get(binKey);
// convert value from internal and update
Bar bar = (Bar) ctx.getValueFromInternalConverter().convert(binValue);
bar.setBar(bar.getBar() + " updated");
// update backing map
binValue = (Binary) ctx.getValueToInternalConverter().convert(bar);
mapBack.put(binKey, binValue);
catch (Throwable oops)
throw ensureRuntimeException(oops);
return null;
public static void main(String[] asArg)
try
NamedCache cacheFoo = CacheFactory.getCache("foo");
NamedCache cacheBar = CacheFactory.getCache("bar");
Foo foo = new Foo();
foo.setFoo("initial foo");
cacheFoo.put("test", foo);
Bar bar = new Bar();
bar.setBar("initial bar");
cacheBar.put("test", bar);
System.out.println(cacheFoo.get("test"));
System.out.println(cacheBar.get("test"));
cacheFoo.invoke("test", new Main());
System.out.println(cacheFoo.get("test"));
System.out.println(cacheBar.get("test"));
catch (Throwable oops)
err(oops);
finally
CacheFactory.shutdown();
}