🚀 go-pugleaf

your sig is wrong :
 > meth = (*env)->GetStaticMethodID (env, sys, "setProperty",
 > 
"(Ljava/lang/String;)Ljava/lang/String;","(Ljava/lang/String;)Ljava/lang/String;"); 


the right is :

(*env)->GetStaticMethodID (env, sys, "setProperty", 
"(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;");


so, if a JNI method throw an exception you must clear it before call 
another one :

	(*env)->ExceptionClear(env);

=>
sys = (*env)->FindClass (env, "java/lang/System");
(*env)->ExceptionClear(env);

meth = (*env)->GetStaticMethodID (env, sys, "setProperty",
"(Ljava/lang/String;)Ljava/lang/String;");
(*env)->ExceptionClear(env);

...


zikfried a �crit:
> hi,
> i want to change my JVM properties("user.dir", "os.name" etc...) using JNI.
> So the setProperty() method have 2 parameters that's why i have tried to 
> do this :
> 
> sys = (*env)->FindClass (env, "java/lang/System");
> 
> meth = (*env)->GetStaticMethodID (env, sys, "setProperty", 
> "(Ljava/lang/String;)Ljava/lang/String;","(Ljava/lang/String;)Ljava/lang/String;"); 
> 
> 
> (*env)->CallStaticObjectMethod(env, sys, meth, (*env)->NewStringUTF 
> (env, &key),(*env)->NewStringUTF (env, &newVal));
> 
> I don't understand why it doesn't work.
> 
> Can anyone help me?
> Thanks by advance