java - which webserver is the application running on

Question

I have a java app that can be run both on tomcat and jboss.

I need to do a "if condition" for performing certain tasks based on the webserver type.

How can I access this information?

I need to do that because I need to connect to the datasource, and I can get the Context in different ways based on the webserver:

try{
    String webserver = getWebServer();
    Logger logger=Logger.getLogger("myLog");
    if(webserver.equalsIgnoreCase("Jboss")){
        logger.severe("Webserver: " + webserver);
        Hashtable<String, String> ht= new Hashtable();
        ht.put(InitialContext.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");
        ht.put(InitialContext.PROVIDER_URL,"jnp://localhost:1099");
        ht.put(InitialContext.URL_PKG_PREFIXES,"org.jboss.naming:org.jnp.interfaces");
        InitialContext ic=new InitialContext(ht);
        if(ic!=null){
            logger.severe("success");/*I am getting success as output here*/
            DataSource ds=(DataSource)ic.lookup(getDatasource());
            /*this is where it's failing*/
            if(ds!=null){
                logger.severe("success1");
            }
            return ds.getConnection();
        }
        return null;
    }
    else{ //TOMCAT
        logger.severe("Webserver: " + webserver);
        // Obtain our environment naming context
        Context initCtx = new InitialContext();
        Context envCtx = (Context) initCtx.lookup("java:comp/env");

        // Look up our data source
        DataSource ds = (DataSource) envCtx.lookup(getDatasource());

        // Allocate and use a connection from the pool
        Connection conn = ds.getConnection();
        return conn;
    }

}

Tomcat version doesn't work on jboss, and viceversa Thank you!

What sort of tasks do you want to do? It's unusual because the point of a war is that it can run in any appserver and shouldn't know about it. — mikea
– mikea, Commented Jan 31, 2014 at 8:47
Do a request and read the header with some luck you get a hint which server is used. I understand that your app can work in any server and you propably don't have control over the server, right ? — PeterMmm
– PeterMmm, Commented Jan 31, 2014 at 8:57

A4L · Accepted Answer · 2014-01-31 09:07:01Z

2

Since your application can run on Tomcat which is a simple servlet container then you might want to use ServletContext#getServerInfo(). to get Information about the environment your application is running inside.

answered Jan 31, 2014 at 9:07

A4L

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Ankit · Accepted Answer · 2014-01-31 08:55:08Z

2

Quite unusual requirement, however can be achieved using System property. In server startup script pass System property in JAVA_OPTS like:

-Dserver=tomcat

Pass different values for different server and then You can read this system property by following code:

System.getProperty("server");

answered Jan 31, 2014 at 8:55

Ankit

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2 Comments

PeterMmm Over a year ago

Isn't it better to put this parameter into the webdescriptor of the webapp ?

Ankit Over a year ago

@PeterMmm: Usually yes, but not for this case, as the user wants to use same web app in two application servers.

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