Hi Team,
Builds are failing and i could see the below errors in catalina.out log.May i know what could be the reason please?

It sayd Java heap size issue but we have set Xmx for 6GB.

Jan 28, 2013 1:48:42 AM hudson.triggers.SafeTimerTask run
SEVERE: Timer task hudson.model.LoadStatistics$LoadStatisticsUpdater@1efa7ea7 failed
java.lang.OutOfMemoryError: Java heap space
Jan 28, 2013 1:48:42 AM hudson.slaves.ChannelPinger$1 onDead
INFO: Ping failed. Terminating the channel.
java.io.IOException: SSH channel is closed. (Close requested by remote)
at com.trilead.ssh2.channel.ChannelManager.sendData(ChannelManager.java:383)
at com.trilead.ssh2.channel.ChannelOutputStream.write(ChannelOutputStream.java:63)
at java.io.ObjectOutputStream$BlockDataOutputStream.drain(ObjectOutputStream.java:1838)
at java.io.ObjectOutputStream$BlockDataOutputStream.setBlockDataMode(ObjectOutputStream.java:1747)
at java.io.ObjectOutputStream.writeNonProxyDesc(ObjectOutputStream.java:1249)
at java.io.ObjectOutputStream.writeClassDesc(ObjectOutputStream.java:1203)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1387)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)
at java.io.ObjectOutputStream.writeFatalException(ObjectOutputStream.java:1538)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:329)
at hudson.remoting.Command.writeTo(Command.java:81)
at hudson.remoting.ClassicCommandTransport.write(ClassicCommandTransport.java:41)
at hudson.remoting.Channel.send(Channel.java:496)
at hudson.remoting.Request.callAsync(Request.java:208)
at hudson.remoting.Channel.callAsync(Channel.java:690)
at hudson.remoting.PingThread.ping(PingThread.java:99)
at hudson.remoting.PingThread.run(PingThread.java:81)
Jan 28, 2013 1:49:22 AM hudson.slaves.ChannelPinger$1 onDead
SEVERE: Failed to terminate the channel:
java.io.IOException: SSH channel is closed. (Close requested by remote)
at com.trilead.ssh2.channel.ChannelManager.sendData(ChannelManager.java:383)
at com.trilead.ssh2.channel.ChannelOutputStream.write(ChannelOutputStream.java:63)
at java.io.ObjectOutputStream$BlockDataOutputStream.drain(ObjectOutputStream.java:1838)
at java.io.ObjectOutputStream$BlockDataOutputStream.setBlockDataMode(ObjectOutputStream.java:1747)
at java.io.ObjectOutputStream.writeNonProxyDesc(ObjectOutputStream.java:1249)
at java.io.ObjectOutputStream.writeClassDesc(ObjectOutputStream.java:1203)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1387)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)
at java.io.ObjectOutputStream.writeFatalException(ObjectOutputStream.java:1538)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:329)
at hudson.remoting.Command.writeTo(Command.java:81)
at hudson.remoting.ClassicCommandTransport.write(ClassicCommandTransport.java:41)
at hudson.remoting.Channel.send(Channel.java:496)
: