how to check whether server is running or not

[Sivakumar Nachimuthu]

My EJBs are deployed in server.
In case server is not running and i lookup the bean in client using context.lookup() ..
Exception is shown that connection refused like this

 
 WARN NamingContext:1185 - Failed to connect to localhost:1099
javax.naming.CommunicationException: Failed to connect to server localhost:1099
[Root exception is javax.naming.ServiceUnavailableException: Failed to connect to server localhost:1099 [Root exception is java.net.ConnectException: Connection refused]]
        at org.jnp.interfaces.NamingContext.getServer(NamingContext.java:215)
        at org.jnp.interfaces.NamingContext.checkRef(NamingContext.java:1181)
        at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:514)
        at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:507)
        at javax.naming.InitialContext.lookup(InitialContext.java:347)
    
        at java.lang.Thread.run(Thread.java:534)
Caused by: javax.naming.ServiceUnavailableException: Failed to connect to server localhost:1099 [Root exception is java.net.ConnectException: Connection refused]
        at org.jnp.interfaces.NamingContext.getServer(NamingContext.java:190)
        ... 9 more
Caused by: java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
        at java.net.Socket.connect(Socket.java:452)
        at java.net.Socket.connect(Socket.java:402)
        at java.net.Socket.<init>(Socket.java:309)
        at java.net.Socket.<init>(Socket.java:211)
        at org.jnp.interfaces.TimedSocketFactory.createSocket(TimedSocketFactory.java:69)
        at org.jnp.interfaces.TimedSocketFactory.createSocket(TimedSocketFactory.java:62)
        at org.jnp.interfaces.NamingContext.getServer(NamingContext.java:186)
        ... 9 more
 
 
 

So i want to check whether server is running before i lookup.How can i do that?
Thanks in advance
Siva

[ October 27, 2004: Message edited by: Sivakumar Nachimuthu ]
[ October 27, 2004: Message edited by: Sivakumar Nachimuthu ]

[Gaurav Chikara]

You can do a ping on the server to see if it responds

[Sivakumar Nachimuthu]

Server machine may be running.
But i want to know whether Jboss server running
in the remote server machine in the port 1099.

Thanks
Siva
[ October 27, 2004: Message edited by: Sivakumar Nachimuthu ]

[Anand Gondhiya]

telnet http://[machine-name]:[port]/

for ex: http://www.javaranch.com

[Sivakumar Nachimuthu]

yaa u r right.but i want know thru my java code whether server running in the remote machine in th port 1099.
siva

[Prakash Dwivedi]

Originally posted by Sivakumar Nachimuthu:
yaa u r right.but i want know thru my java code whether server running in the remote machine in th port 1099.
siva

Hello Siva,
I think you should try using java.net package for this purpose.

[Siplin Ayishoto]

Why dont you catch that exception? (it is not a runtime exception...)
Also, I dont see what you can achieve by knowing it 'beforehand'.
-Siplin
[ November 10, 2004: Message edited by: Siplin Ayishoto ]

[Sivakumar Nachimuthu]

we cant catch these exception.The Above exception was caught inside jboss naming server and printStackRace of exception is printed by jboss naming service.

Siva