Communication between a web app and a simple app

Question

I've got 2 different web applications running.

'Web application A' has all the business logic layer services.
I need to invoke methods defined in 'Web application A' from 'Web application B'.

How can I use services(or methods) from 'Web application B' without sending
a http request ?

So far I've found that you can invoke a java programme as described in this question.
Execute a Java program from our Java program

I wonder which one is the right way. Call method by sending a http request or call some method directly.
Could you also tell me which one is better, and why ?

Edit
Could I use Springframework's remote invoking ?
http://static.springsource.org/spring/docs/2.0.x/reference/remoting.html
Which one is more desirable. Spring remoting or EJB ?
We are using Tomcat.

making a HTTP call might prove to be very cozy , on the other hand the other alternative you mentioned is not really the way to do it — Hussain Akhtar Wahid 'Ghouri', Feb 05 '13 at 09:13
@HussainAkhtarWahid Thank you. I wonder if sending a http request might bring some overhead compared to calling it directly in a Java-ish way than Servlet-ish way ? — Ascendant, Feb 05 '13 at 09:15
actually with my experience the converse is true , rest i hope the genius race from stackoverflow may give any superlative advice — Hussain Akhtar Wahid 'Ghouri', Feb 05 '13 at 09:17
The standard version of Tomcat does not have support for EJBs, you need to use TomEE, or plug OpenEJB into Tomcat to use EJBs. If you are using Spring already then you can consider that Spring remote invoking option. — Bogdan, Feb 05 '13 at 09:38

score 1 · Accepted Answer · edited Apr 13 '13 at 08:45

1

Remote EJB invocation is the standard way to make a call between two applications in the Java EE world.

edited Apr 13 '13 at 08:45

Arjan Tijms

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answered Feb 05 '13 at 09:15

Bogdan

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score 0 · Answer 2 · answered Feb 05 '13 at 09:22

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I thing RESTful Web Services is the right way of doing this. You will just expose some of your classes and method as a service and some other application may call them whenever it wants. See this very basic tutorial from Oracle.

answered Feb 05 '13 at 09:22

Petr Mensik

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He asked about invocation without using HTTP calls, the standard implementation of REST web services is also over HTTP. – Bogdan Feb 05 '13 at 09:40
OP asked what is the right way and I think this is a perfect use case for web services. – Petr Mensik Feb 05 '13 at 09:47

Communication between a web app and a simple app

2 Answers2