Issue in executing JNI execution.

Question

1.00/5 (1 vote)

See more:

HI,
I have a following scenario.
1. Have 3 components. C## App, C++ dll, a .jar file
2. The c++ application executes the jar file using JNI Invocation and gives me a result.
3. The C# app triggers the call to the c++ method.

Having no issues in executing the c++ independently, but when testing the complete process facing error in Creating the NewObject in JNI. Fails with a NULL error

Would like to know if anyone has gone through this..

What I have tried:

Have tried clearing the

env->DeleteLocalRef(objname);
env->DeleteGlobalRef(objname);
env->DeleteWeakGlobalRef(objname);

Posted 1-Jul-24 8:40am

Avinash R Mys

Updated 2-Jul-24 4:20am

v2

Add a Solution

Comments

Richard Deeming 2-Jul-24 3:55am

If there's no error, then how exactly does it "fail"?

What have you done to diagnose the problem?

At a guess, it could be environment variables, or a 32-bit/64-bit issue. But with such limited information, there's really not much anyone can do to help.

Avinash R Mys 2-Jul-24 10:27am

returns NULL

Malcolm Arthur McLean 2-Jul-24 5:40am

Have you tried this with a "hello world" jar file?

Richard MacCutchan 2-Jul-24 6:22am

If you are "facing error in Creating the NewObject in JNI.", then how can it fail without error? You need to show some actual code and explain where the problem occurs. Please use the Improve question link above, and add complete details.

Richard Deeming 2-Jul-24 10:28am

"Fails with a NULL error"

Well, that's no more help than your original description!

Don't try to "summarise" the error; provide the complete error message, and the relevant parts of your code.

Richard MacCutchan 2-Jul-24 11:01am

"Would like to know if anyone has gone through this.."
Yes, lots of people, it is one of the most common errors we see here. But no one can help you fix it unless you show us the code where it occurs.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

KarstenK · Answer 1 · 2024-07-03T00:31:00

Your problem is clearly in the jar Files. So you need to carefully inspect the code which is failing with its error message. One common issue is that the class or some dependency (like member) you want to instanciate isnt public.
Make some error handling like excpeption code with some output to get more.

A very common issue is that you havent installed the correct version of Java. Try to execute the java code at the command line or some debugger. (and not in the JNI)