memory used up again and server hang

[Li Li <fa...@gmail.com>]

I have set <memoryUsage percentOfJvmHeap="50" /> and it still used up
all heap memory and the server can do nothing but gc. I have set max
heap size -Xmx1g
all the messages I sent are TextMessages. I suspect that there exists
bug in estimating memory usage.
jmap -histo result is:

1: 3523161 387547952 [C
2: 71065 188665344 [B
3: 3503616 84086784 java.lang.String
4: 1274313 40778016 javax.management.MBeanAttributeInfo
5: 719771 28790840 javax.management.MBeanOperationInfo
6: 770490 24655680 javax.management.MBeanParameterInfo
7: 693101 22179232 java.util.HashMap$Entry
8: 308652 17284512 org.apache.activemq.management.CountStatisticImpl
9: 102903 16842728 [Ljava.util.HashMap$Entry;
10: 354833 15635872 [Ljava.lang.Object;
11: 479668 12333960 [Ljavax.management.MBeanParameterInfo;
12: 311382 9964224 java.util.concurrent.locks.ReentrantLock$NonfairSync
13: 57018 8577136 <constMethodKlass>
14: 171709 8242032
java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync
15: 326334 7832016 java.util.concurrent.atomic.AtomicLong
16: 41969 7722296 org.apache.activemq.command.ActiveMQTextMessage
17: 154461 7414128 java.util.HashMap
18: 131592 7369152 org.apache.activemq.command.MessageId
19: 57018 7308112 <methodKlass>
20: 5244 6225528 <constantPoolKlass>

I also dumped all the heap, it's about 1GB.