Jni – java native interface
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How to interact with native code from Java
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Jni – java native interface
- 1. JNI – Java Native Interface How to persuade my Java application to talk to evil evil C native code
- 2. • WHAT? • WHY? • WHY NOT? • THE ACTUAL CODE • GOODIES
- 3. Er… WHAT? Java applications Native applications
- 5. But, but… WHY? Allows native API function calls
- 6. But, but… WHY? Usage of existing native libraries
- 7. But, but… WHY? Execution of time-critical code
- 8. OK, so WHY NOT? Use of JNI should be avoided whenever reasonably possible!
- 9. Example Java native function declaration first:
- 10. Example
- 11. Example
- 12. Example
- 13. Example
- 14. Example
- 15. Example Careful!
- 16. Example
- 17. Example
- 18. Example
- 19. Exceptions?! Doable but annoying.
- 20. Other things to know • Forget about garbage collection • Java JVM is nazi about its memory space
- 21. I DON’T EXIST jernej@virag.si Skype: izacus