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From "Neil Gidley" <gidl...@kpe.com>
Subject java.lang.OutOfMemoryError
Date Sat, 06 Apr 2002 00:57:42 GMT
Hi,

My website is using the following versions of software:

Struts 1.0.2 
Apache 1.3.22
Tomcat 4.0.2 
Java Runtime Env 1.4
MySQL 3.23.41
RedHat Linux 7.2 using Linux 2.4 kernel

Over a period of time, while running "top" I see memory being eaten up on my box (box has
1GB of RAM). Free memory goes down to about 5-15MB which is way too low.

Occasionally (i.e. once a week or once every two weeks), the site goes down/can't send responses.
I see the following error in my /var/tomcat4/logs/catalina.out file:


java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start(Native Method)
        at org.apache.catalina.connector.warp.WarpConnection.start(WarpConnection.java:159)
        at org.apache.catalina.connector.warp.WarpConnector.run(WarpConnector.java:601)
        at java.lang.Thread.run(Thread.java:536)
java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start(Native Method)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.a(DashoA6275)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.a(DashoA6275)
        at com.sun.net.ssl.internal.ssl.AppOutputStream.write(DashoA6275)
        at java.io.OutputStream.write(OutputStream.java:58)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(DashoA6275)
        at sun.net.www.protocol.https.HttpsClient.afterConnect(DashoA6275)
        at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(DashoA6275)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:556)
        at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:1144)
        at sun.net.www.protocol.http.HttpURLConnection.getResponseCode(HttpURLConnection.java:1158)
        at com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl.getResponseCode(DashoA6275)
        at com.mandalaybay.actions.ResNetStatus.run(ResNetStatus.java:52)

Once I restart Tomcat, memory is freed up and the site goes along until this error occurs
again a week or two later.
Looks like a memory leak, but not sure the real cause. I saw a similar problem which occurred
much more frequently  with Tomcat 4.0.2 with JVM 1.3 so I've upgraded to JVM 1.4 and now receive
an out of memory problem only sporadically.

Has anyone else encountered this problem?
If not, does anyone have some really good tools/commands which can help determine the cause
of the problem?

My JVM settings have default heap size 128MB and max size 256MB by using the following command:
JAVACMD="$JAVA_HOME/bin/java -Xms128m -Xmx256m"


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