Re: Out of memory exception

André Warnier Thu, 23 Jan 2014 09:08:41 -0800

Randeep wrote:

Hi all,
Thanks a lot for valuable points. Here the information you guys asked and
the changes I made.


OS : CentOS release 5.4 (Final)
httpd-2.2.3-65.el5.centos(front_end) +(mod_jk)+ apache-tomcat-6.0.37

I installed httpd using yum.
Downloaded tomcat from Apache as compressed archive(tar.gz)

I'm using following startup script.
[root@server ~]# cat /etc/init.d/tomcat6
#!/bin/bash
# description: Tomcat Start Stop Restart
# processname: tomcat
# chkconfig: 234 20 80
JAVA_HOME=/usr/java/default
export JAVA_HOME
PATH=$JAVA_HOME/bin:$PATH
export PATH
CATALINA_HOME=/usr/share/apache-tomcat-6.0.37
case $1 in
start)
sh $CATALINA_HOME/bin/startup.sh
;;
stop)
sh $CATALINA_HOME/bin/shutdown.sh
;;
restart)
sh $CATALINA_HOME/bin/shutdown.sh
sh $CATALINA_HOME/bin/startup.sh
;;
esac
exit 0

As you said, I removed the JAVA_OPTS declaration from .bash_profile and I
have created setenv.sh and set JAVA_OPTS in it.
[root@server bin]# pwd
/usr/share/apache-tomcat-6.0.37/bin

[root@server bin]# cat setenv.sh
export JAVA_OPTS='-Xms256m -Xmx512m -Xss512k -verbose:gc -Xloggc:heap.log'

Now it shows in grep.
[root@server bin]# ps aux | grep Bootstrap
root      1100 33.7  5.4 707052 95240 pts/0    Sl   11:29   0:06
/usr/java/default/bin/java
-Djava.util.logging.config.file=/usr/share/apache-tomcat-6.0.37/conf/logging.properties
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Xms256m
-Xmx512m -Xss512k -verbose:gc -Xloggc:heap.log
-Djava.endorsed.dirs=/usr/share/apache-tomcat-6.0.37/endorsed -classpath
/usr/share/apache-tomcat-6.0.37/bin/bootstrap.jar
-Dcatalina.base=/usr/share/apache-tomcat-6.0.37
-Dcatalina.home=/usr/share/apache-tomcat-6.0.37
-Djava.io.tmpdir=/usr/share/apache-tomcat-6.0.37/temp
org.apache.catalina.startup.Bootstrap start
root      1158  0.0  0.0   3932   692 pts/0    R+   11:29   0:00 grep
Bootstrap
[root@server bin]#

But nothing came in heap.log. So I better monitor this and if I get the OOM
again I have to increase Max limit!


Maybe you should provide a full path for the -Xloggc option ?



On Thu, Jan 23, 2014 at 8:50 PM, Christopher Schultz <
ch...@christopherschultz.net> wrote:

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Randeep,

On 1/23/14, 7:43 AM, Randeep wrote:

I'm getting out of memory exception errors.

:(

Exception in thread "Timer-1" java.lang.OutOfMemoryError: Java heap
space at java.util.Arrays.copyOf(Arrays.java:2882) at

java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:100)

at

java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:572)

at java.lang.StringBuffer.append(StringBuffer.java:320)

at org.json.JSONArray.toString(JSONArray.java:834) at
org.json.JSONObject.valueToString(JSONObject.java:1359) at
org.json.JSONObject.toString(JSONObject.java:1233) at
com.xxx.xxx.servlet.WServlet.writeProgramJson(WServlet.java:503) at
com.xxx.xxx.servlet.WServlet$1.run(WServlet.java:414) at
java.util.TimerThread.mainLoop(Timer.java:512) at
java.util.TimerThread.run(Timer.java:462)

If you are trying to serialize huge JSON objects, this is going to
happen. I'm not sure if JSON is as smart as the Java Serialization
engine, but if you have a circular-reference in your object graph, I'd
be willing to bet that the JSON serializer will run forever and
exhaust your heap.

It's also possible that you simply have a tiny heap and need more,
especially if you aren't currently setting any heap parameters.

Is there anyway to see currently set jvm heap size details? Any
linux commands.

You can attach any profiler to your app. Good luck catching this in
the act, though, in production.

You can also use "jmap -heap" which comes with the JDK. Just point it
at a process and you'll get a heap summary from a running JVM. Make
sure your JVM and jmap version match.

I have tried creating setenv.sh and putting the new parameters in
it. but echo $JAVA_OPTS was not giving any value.

setenv.sh is run during Tomcat startup. Running "echo $JAVA_OPTS" from
the command-line isn't going to reveal anything. What you want to do
is modify setenv.sh, re-launch Tomcat, and then look at the process
command line... something like this:

$ ps aux | grep Bootstrap

This should give you the whole command-line for Tomcat, and you can
verify that your heap options have been set.

So I have put in .bash_profile and run it. Then restarted tomcat6.

Don't do that: it will only work if you login using bash, and it won't
work for other users you may have to restart Tomcat.

this is the line I added in .bash_profile. JAVA_OPTS="-Xms256m
-Xmx512m -Xss512k -verbose:gc -Xloggc:heap.log"

You'll need to "export" JAVA_OPTS, otherwise it won't do anything for you.

- -chris
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Re: Out of memory exception

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