NME: JNI call to generic typed method - a String to Object casting issue?

[Rocks Wang]

Hi all,

 

I know it should not be a problem since generic in java is just a compile-time stuff, after the type erasing, all generic types are replaced by Ljava/lang/Object;.

However when I was trying to invoke such a method with String argument from haXe, I got following error:

E/NME     (19206): HaxeToJNI : jniObject not an object 0x47b697dc

E/NME     (19206): HaxeToJNI could not convert param 0 (0x47b697dc) to 3x0

E/NME     (19206): CallMember - bad argument list

 

my haxe code:

    var Map_new = JNI.createStaticMethod("java/util/HashMap", "<init>", "()V") ;

    var Map_put = JNI.createMemberMethod("java/util/Map", "put", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;") ;

    var Map_size = JNI.createMemberMethod("java/util/Map", "size", "()I") ;

    var map = Map_new();

    trace("tojavamap newinst ok: size=" + Map_size(map)); // this is ok, output is zero

    Map_put(map, "key", "value"); // exception here

 

I'm not familiar with JNI, maybe it's because haxe JNI didn't treat haxe String as a jniObject?

Regards,

Rocks

[Hugh]

Hi,

You are right - it should allow you to pass a string to a java.lang.Object.

The fix should be relatively easy to fix in JNI.cpp, before "ELOG("HaxeToJNI : jniObject not an object %p", inValue);"

try (untested):

// Might be a string object...

if (val_is_string(inValue))

{

    out.l = inEnv->NewStringUTF(val_string(inValue));

    return true;

}

// Nope - must be an error...

ELOG("HaxeToJNI : jniObject not an object %p", inValue);

Hugh