Java

function getParent(el, parentTagName){
	var obj = el;
	while(obj.tagName !== parentTagName){
		obj = obj.parentNode;
	}
	
	alert(obj.id);
}

<div id="0">
<form>
<input type="submit" target="pr" value="Go" onclick="getParent(this, 'DIV')">
</form>
</div>

<div id="0">
<form>
<input type="submit" target="pr" value="Go"  onclick="getParent(this, 0)">
</form>
</div>

public void Update( Coordinate3D pCoord, float pRange, float pTargetElevation,float pLeftHeading, float pRightHeading, 
                                float pRayResolution, int pMaxNumberOfSamplePerRay, ArrayList<CoverageRay> pCoverageRay){
        jUpdate(refClass, pCoord, pRange, pTargetElevation, pLeftHeading, pRightHeading, pRayResolution, pMaxNumberOfSamplePerRay, pCoverageRay);
    }
   

    private native void jUpdate(long pRefClass, Coordinate3D pCoord, float pRange, float pTargetElevation,float pLeftHeading, float pRightHeading,
                                float pRayResolution, int pMaxNumberOfSamplePerRay, ArrayList<CoverageRay> pCoverageRay);

/*
 * Class:     MapLayers_VectorMapLayers_CoverageMap
 * Method:    jUpdate
 * Signature: (JLShared/Coordinate3D;FFFFFILjava/util/ArrayList;)V
 */
JNIEXPORT void JNICALL Java_MapLayers_VectorMapLayers_CoverageMap_jUpdate
  (JNIEnv *, jobject, jlong, jobject, jfloat, jfloat, jfloat, jfloat, jfloat, jint, jobject );