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  Asked By: Bastet    Date: Nov 19    Category: Java    Views: 615

I don't know if this is the appropriate list to post this to, if not please
forgive me, but I am
stumped and I need some help.

I am working on a Java application. Part of the work that I have to do involves
interfacing with
a C api. One of the functions that I need to create will accept a Vector as an
argument, call the
backend code to get a list of objects, and then for each element in the list add
a new object to
the vector. The code I have is as follows: (yes, I know that goto's are
generally considered
bad... I used them anyhow... :-( )

JNIEXPORT void JNICALL Java_volume_VolumeSetList_getSetObjs(JNIEnv* env, jclass
jobject sets)
set_list_t* list;
set_list_t* ptr;
jclass vol_set;
jclass vector;
jmethodID vol_set_const;
jmethodID vector_add;

list = get_set_list();

vol_set = (*env)->FindClass(env, "volume/VolumeSet");
if((*env)->ExceptionOccurred(env)) {
goto clean_up;

vector = (*env)->GetObjectClass(env, sets);
if((*env)->ExceptionOccurred(env)) {
goto clean_up;

vol_set_const = (*env)->GetMethodID(env, vol_set, "<init>",
if((*env)->ExceptionOccurred(env)) {
goto clean_up;

vector_add = (*env)->GetMethodID(env, vector, "addElement",
if((*env)->ExceptionOccurred(env)) {
goto clean_up;

for(ptr = list; ptr != NULL; ptr = ptr->next) {
jstring jstr;
jobject jobj;

jstr = (*env)->NewStringUTF(env, ptr->name);
if((*env)->ExceptionOccurred(env)) {
goto clean_up;

jobj = (*env)->NewObject(env, vol_set, vol_set_const, jstr);
if((*env)->ExceptionOccurred(env)) {
goto clean_up;

(*env)->CallVoidMethod(env, vector, vector_add, jobj);
if((*env)->ExceptionOccurred(env)) {
goto clean_up;


If I leave out the call to CallVoidMethod() I don't get any errors (that I know
of - without
populating the vector I have no idea whether the VolumeSet objects are being
created properly or
not). Once I include the call I get an AbstractMethodError. I am running suns
jdk1.3.1_03 on
linux. I have unjared the source for Suns library and checked out their
implementation of
Vector.addElement() and it is not abstract... I have no idea what is wrong.
Anyone have any



1 Answer Found

Answer #1    Answered By: Guilherme Silva     Answered On: Nov 19

You would think that gcc would have
caught my stupid error (passing the class object  to CallVoidMethod
rather than the jobject).

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