Changing or Renewing JSESSIONID in JBoss

I think if you reach this page by searching a keyword like this entry's title, I don't think you are expecting the answer to be something like below

session.invalidate();

Which you have tried and failed miserably. The JSESSIONID just won't change from its originally assigned value no matter what you did.

You are in luck if you are encountering this issue in your JBoss server, because I might have the answer for you.

So let's get started, first, you have to invalidate your session using the code I've posted above. Second, you have to locate server.xml files depending on the JBoss' version that you are using. For me, I'm using JBoss 4.2.3 GA, so the location is at JBOSS_HOME/server/default/deploy/jboss-web.deployer/ folder.

Located it? Great, now change all of the emptySessionPath value that you can find in this file to false.

Restart your JBoss, cross your fingers, and try again.

Cheers.

Socket Accept Failed

Encountered funny error thrown by JBoss today when deploying JBoss 4.2.3GA

[JIoEndpoint] Socket accept failed
java.net.SocketException: Too many open files

Apparently JBoss somehow opened too many socket for some reason and start complaining itself.

So I've learned another new handy command to see what file handle are open using the following command.

lsof -p [PID]

Note: PID = process id, use ps command to see the process id.

If you want to count how many were open, can add wc command to it.

lsof -p [PID] | wc

Example output:

[root@localhost]# lsof -p 30328 | wc
1239 11141 153600

Translation: 1239 lines, 11141 words, 153600 chars.

So to solve this issue, go to jboss/server/default/deploy/jboss-web.deployer/ folder (might not be the exact path, depends on your JBoss version) and open server.xml file, replace the following

<Connector port="8080" address="${jboss.bind.address}"
maxThreads="250" maxHttpHeaderSize="8192"
emptySessionPath="true" protocol="HTTP/1.1"
enableLookups="false" redirectPort="8443" acceptCount="100"
connectionTimeout="20000" disableUploadTimeout="true" />

with

<Executor name="appThreadpool" namePrefix="activeThread-"
maxThreads="150" minSpareThreads="3" maxIdleTime="30000" />

<Connector executor="appThreadpool" port="8080"
address="${jboss.bind.address}" maxThreads="150"
maxHttpHeaderSize="8192" minSpareThreads="3"
maxSpareThreads="20" emptySessionPath="true" protocol="HTTP/1.1"
enableLookups="false" redirectPort="8443" acceptCount="100"
connectionTimeout="20000" disableUploadTimeout="true" />

And then replace the following

<Connector port="8009" address="${jboss.bind.address}" protocol="AJP/1.3"
emptySessionPath="true" enableLookups="false" redirectPort="8443" />

with

<Connector executor="appThreadpool" port="8009"
address="${jboss.bind.address}" protocol="AJP/1.3"
emptySessionPath="true" enableLookups="false" redirectPort="8443" />

Then save the server.xml and restart your JBoss.