JNI Versus MQ Series

Question

For one of our projects I am given a task of integrating with EJB for data access from a C++ client. Since I couldnt use corba i have two options available JNI / IBM MQ. Since I am new to the Java world I hoping you gurus could solve my dilemma with JNI and MQ.
Has anyone used JNI for accessing beans for data access. there will be atleast 10000 calls made per hour and the amount of data is not that big. What would a Java Architect do given the oppurtunity of using MQ versus JNI.
I heard anecdotes saying JNI is complex and JVM will take time to load and so on.. My initial code for access a java class is "manageable" and I load JVM once in the beginning. I wondering which is faster and reliable.
Any comments much appreciated..

Answer 1

You said:
So in my c++ class I load the JVM once in the beginning, load a java proxy class that will pre
load classes and execute methods for the C++ server. Clients requesting data will tell me which >>class to ask for and I execute methods on that class. The data is returned to me as an xml
string. Please explain "clients". Who are your clients? Is there such a C++ code already in place??? And some existing client? Who accesses your C++ code, and how?
Also, please explain C++ server. In what sense is it a server?
If there is none at the moment, I think you are making things a bit too complex.
If your clients are instances of servlet (JSP) invokation:
There is at least one JVM in which all servlets run.
In one of your Beans, or servlets, you declare native methods to do the data fetching stuff.
You also have instances of classes that do the XML generation.
If you first need to call the native methods which will do the data fetch for you, and return data to your Java side code as a string, array or of strings, vector of strings or in some data structure.
(RecordSet???)
And then on this data, you use one of your "XML generating class" object to generate XML.
Return this XML data to your clients, which I guess would be other Servlets or JSPs.
Once you have the basic structure in place, people here can help you with deeper problems like threads, performance etc.
Since each servlet/ JSP runs in a different thread, you can make your calls to native code thread safe my keeping most of your stuff in the native function scope. Global variable should be placed in critical sections.
I hope I made some sense.
Please update me with whatever advances you make. I intend to learn a lot from these forums.
cheers
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