How to execute a jar file on jboss7 startup? - module

Question

I have a simple java class which displays "waiting" text on execution , in "TMSCore" java project.
package com.stock.bo;
public class example {
/**
* #param args
*/
public static void main(String[] args) {
// ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
System.out.println("================================> waiting");
}
}
I have created TMSCore.jar and have set this example.class as entry point ,of my jar file.
Then i have created a module for this project in C:\Jboss\jboss-as-7.1.1\modules\org\tms\main , and pasted the jar in the same path
then i have created module.xml and pasted in the same path
module.xml
<?xml version="1.0" encoding="UTF-8"?>
<module xmlns="urn:jboss:module:1.1" name="org.tms">
<resources>
<resource-root path="TMSCore.jar"/>
</resources>
</module>
then i have created a jboss-deployment-structure.xml in my webproject/web-inf directory
<?xml version="1.0" encoding="UTF-8"?>
<jboss-deployment-structure>
<deployment>
<dependencies>
<module name="org.tms"/>
</dependencies>
</deployment>
</jboss-deployment-structure>
when i start the server with my war containing above jboss-deployment-structure.xml, in my console its showing deployed TMSCore.jar
but my "waiting" text in my jar is not displayed on console
my requirement is i should get "================================> waiting" on my console once jboss is started up
or else can any one can suggest how to make a jar to execute on starting jboss server?
BTW i am using JBOSS7.1

Answer 1

If I am right it's because JBoss doesn't execute a library, it only loads the classes contained in the jar file. So putting a main function and generating an executable jar will not help.
If your goal is to have an global module on the server, I suggest you these modifications:
Create the module (as you have already done)
Declare it as dependency in jboss-deployment-structure.xml (as you have already done)
Declare it as global module on the server, so it will be loaded only once by JBoss. Edit the configuration file standalone.xml and modify the section:
<subsystem xmlns="urn:jboss:domain:ee:1.0">
<global-modules>
<module name="org.tms" />
</global-modules>
</subsystem>
Now you have a module that have classes loaded only once. I you need to have only one instance of your Example class, the I suggest you to use an singleton:
public class Example {
// The only one instance
private static Example instance;
// Private constructor to avoid creation of other instances of this class
private Example()
{
System.out.println("================================> waiting");
}
public static Example getInstance()
{
if(instance == null)
{
instance = new Example();
}
return instance;
}
}
Then to use it in all projects on the server
Example ex = Example.getInstance();
will give you back the existing instance (or create one the first time).
Notice: I can't try, so no guarantee that that will work.
Edit: Maybe a small modification of the Example class can also make it run during the classes loading:
public class Example {
// The only one instance
private static Example instance = new Example();
// Private constructor to avoid creation of other instances of this class
private Example()
{
System.out.println("================================> waiting");
}
public static Example getInstance()
{
return instance;
}
}
Again: not tested.

Answer 2

You can't run a jar, but you can execute a startup method in a singleton.
#Startup
#Singleton
public class FooBean {
#PostConstruct
void atStartup() { ... }
#PreDestroy
void atShutdown() { ... }
}
This will happen at application start up and shutdown. I'd call the function you need from there.
See http://docs.oracle.com/javaee/6/tutorial/doc/gipvi.html