Reading shared memory data using Java that is written by C++

Question

I have an application in C/C++ that writes data in shared memory in Unix. Now I want to read that shared memory data through a program using Java.

The program should read the shared memory data. Can it be possible?

Need a small implementation if possible.

Reading shared memory does if ever only work through JNI - in Java you can't do that. My experience with JNI was that some JNI-plugins crashed the otherwise rock-solid Java VM. So maybe another solution is possible? — luukes
– luukes, Commented Jan 8, 2013 at 8:38
This answer stackoverflow.com/a/1492536/1741542 talks about memory mapped files and NIO FileChannel. Maybe this works for you too. — Olaf Dietsche
– Olaf Dietsche, Commented Jan 8, 2013 at 8:54
If you would benefit from persistence of the data (even for debugging purposes) you could consider memory mapped files. Here an implementation which uses pure Java github.com/peter-lawrey/Java-Chronicle — Peter Lawrey
– Peter Lawrey, Commented Jan 8, 2013 at 9:14
@luukes Are you sure that using a Java program we cannot read the shared memory data written by c++ program? And we have to have JNI in between to achieve this? — Nikhil
– Nikhil, Commented Jan 9, 2013 at 11:10

masoud · Accepted Answer · 2013-01-08 08:46:44Z

5

Take a look at this codeproject project (For Windows):

Using Memory Mapped Files and JNI to communicate between Java and C++ programs

Or, this library:

CLIPC is an open-source Java library that gives developers interprocess communications (IPC) capabilities that may be absent or difficult to use in the Java distribution.

edited Jan 8, 2013 at 8:46

answered Jan 8, 2013 at 8:41

masoud

56.8k18 gold badges152 silver badges214 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Nikhil Over a year ago

Can I create a method in C++ only to read the shared memory, and then call this method using JNI? Would that be effective and won't harm to performance also?

masoud Over a year ago

JNI methods should call from Java not C++. Yes you can create a method in C++ to read/write from/to the shared memory. And also you can do same thing in Java with JNI methods. Don't worry about performance if you do it right.

Nikhil Over a year ago

Can you please just tell me the suggestions how can I achieve the below functionality?

Collectives™ on Stack Overflow

Reading shared memory data using Java that is written by C++

1 Answer 1

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related