[Wrapper-user] RE: Re: Invoking another Java service from another Java

[Chris K. <chr...@en...>]

Thanks for the response.

The problem I'm trying to solve is to launch a Java program remotely. I
have an invoker that runs as a service but invokes other programs but
would be neat if I could invoke these programs as services also so that
I gain the recoverability functionality gained by using the Java Service
Wrapper. 

So the two main questions I have is 
- Can I make one service spark off another service?
- Can I do this programmatically without having to rely on configuration
files?

Thanks for any guidance in advance.

-----Original Message-----
From: wra...@li...
[mailto:wra...@li...] On Behalf Of
wra...@li...
Sent: 10 July 2003 04:30
To: wra...@li...
Subject: Wrapper-user digest, Vol 1 #132 - 4 msgs


Send Wrapper-user mailing list submissions to
	wra...@li...

To subscribe or unsubscribe via the World Wide Web, visit
	https://lists.sourceforge.net/lists/listinfo/wrapper-user

Message: 1
Date: Wed, 09 Jul 2003 13:03:33 +0900
From: Leif Mortenson <le...@ta...>
To:  wra...@li...
Subject: Re: [Wrapper-user] Invoking another Java service from another
Java  service wrapper
Reply-To: wra...@li...

This is a multi-part message in MIME format.
--------------060200040702020606050204
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit

Chris,
    Not sure exactly what you are wanting to do.  But individual NT 
Services are
independent of each other.  If you wanted to start a second service when

the first
one was started, your would want to install them both normally.  Then 
you would
trigger the startup of the second service from within the first using
the java.lang.Runtime.exec methods and the "net" command with "start",
"{service name}" arguments.  Have not tested this, but it should work.
In
Wrapper v3.0.4, you will also be able to execute Wrapper.exe with a "-t"
parameter to start the service.

    If you simply want to launch a second JVM from a Java application 
running as
a service, then you can do so by, once again, using the 
java.lang.Runtime.exec
method.  Only this time, execute Java.exe with all the arguments that 
apply.  This
second JVM will be a child process of the first so it will be a part of 
the original
service.  The problem here is that you have to be careful about how you 
shutdown
the service to make sure that the child JVM is always killed.  Failure 
to do so will
result in a zombie process that I believe you will have to reboot to get

rid of.

    If you want to execute a copy of the Wrapper from the exec method, 
you should
be able to specify any property in the wrapper.conf file from the 
command line.
The Wrapper always requires that a wrapper.conf exists.  But if 
everything is on
the command line, then the conf file can be empty.  This would result in

a very long
command line however, so I would only put the parameters that need to be
dynamic on the command line.

Let me know if none of these answers actually answers your question.

Cheers,
Leif

Chris Kelly wrote:

> Is there a way of programmatically invoking a Java service from
> another Java service.
> What I'm looking for is to invoke a Java service without use of 
> explicit configuration files. I could supply this as a
> list of properties instead?
>  








This email is confidential and may be protected by legal privilege. If you are not the intended recipient,  please do not copy or disclose its content but  delete the email and contact the sender immediately. Whilst we run antivirus software on all internet emails we are not liable for any loss or damage. The recipient is advised to run their own antivirus software.