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EJB and Client Side Timeout
Hi
I have a java servlet which accesses a stateless EJB on JBoss on a remote server, using code
like
Object objref = initial.lookup("TestBean")
CalculatorRemoteHome home = (TestRemoteHome) PortableRemoteObject.narro
TestRemote echo = home.create();
int retval=echo.do_long_reques
I want to set a timeout on the method "do_long_request"
ie
1) Request data from ejb
2) if ejb requires more the say 30 seconds to process request and send back result data to client then
timeout on the client side and show a kind of "request took too long" error page.
Is is possible to set such a timeout , either by a config file setting or programatically?
Thanks in advance
brian sweeney
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by: rama_krishna580Posted on 2007-10-04 at 08:24:58ID: 20014934
Hi,
1. EJB invocations are synchronous. You cannot control the time interval for which the thread blocks before sending the response since this is something that's determined purely by the container. Some containers, like BEA's WLI provides you some control over EJB transaction timeout intervals by exposing configurable parameters like trans-timeout-seconds for their container.
2. The ejbTimeout() method is completely unrelated to transaction timeout or execution timeout. It is used with the EJB timer service introduced in EJB 2.1, which provides a way to schedule invocations on a given EJB to occur at specific times in the future.
3. WAS provides a mechanism for setting the transaction timeout. However, the transaction timing out does NOT interrupt the bean from executing -- it is not possible in Java to interrupt an executing thread from another thread (this is a JDK restriction that applies across all vendors). The transaction timing out means that when the bean method does complete, any work performed during that transaction will be rolled back at that time.
i hope this helps you...
R.K