Debugging Java in eclipse error -

i trying debug simple program in eclipse. when run it, program runs expected. when try debug it, program output expected there error

error: jdwp unable jni 1.2 environment, jvm->getenv() return code = -2 jdwp exit error agent_error_no_jni_env(183): [util.c:838]

i use advantage of debugging mode. want know how tweak error.

use

system.exit(0);  

at end of main() method