javac EnvarJni.java

javah -jni EnvarJni

---------- VC++ 6  command-line compilation -------------
cl -Ic:\jdk1.3.1\include -Ic:\jdk1.3.1\include\win32  -MD  -LD envarjniimp.c -Feenvarjni.dll

jar  -cf envarjni.jar  EnvarJni.class EnvarJni$1.class
jar -cf  envarjnilib.jar  envarjni.dll

--------  Need j2se v1.4 to support reading pkcs12 type keystore -----------
\j2sdk1.4.0-rc\bin\jarsigner -storetype pkcs12 -keystore thawtenn.p12 envarjni.jar <your key alias>
\j2sdk1.4.0-rc\bin\jarsigner -storetype pkcs12 -keystore thawtenn.p12 envarjnilib.jar <your key alias>