Using Swing as interface to a dll

I am trying to use Swing as my cross platform GUI for c++ dll's. Each dll has its own GUI. However, one of my dll's controls what other dlls are loaded. This works fine until I try to load a second instance of the control dll. I get an access violation message when I try to update my gui. If I try to load the two dlls from the c++ everything works fine, but if I load one from the Java GUI I get an null access exception. I'm guessing its caused by one of two problems:
1) The DLL loading is trashing the executing stack of either the JAVA or the native code.
2) As the code returns from the constructor call to the newly loaded dll JNI is deleting the interface objects that it is creating on the heap.
Any ideas would be greatly appreciated.
Unfortunately I don't get an error log from JAVA.
VisualStudio gives me:
Unhandled exception at 0x10014a7d (nativedll.dll) in testjava.exe: 0xC0000005: Access violation reading location 0xfeeefef6.
The print out reads:
Creating Java VM
No. Created VMs 0
Creating Frame
Created frame
Begin master update loop
Calling Update
Updated Frame 0
Creating Java VM
No. Created VMs 1
Creating Frame
Created frame
Calling Update
I am using Visual Studio .Net 2003 and jdk 1.4.4, 1.5.0_08 and 1.6.0.
Main application:
#include "Windows.h"
#include "nativelibrary.h"
#include <stdlib.h>
#include <string.h>
#include "jni.h"
int main(int argc, char* argv[])
       //Load first library
     HMODULE handle = LoadLibrary( "../../nativedll/debug/nativedll.dll");
     nativelibrary* (*funcPtr)();
     funcPtr = (nativelibrary*(*)())GetProcAddress( handle, "createObj");
     nativelibrary* newObj = (*funcPtr)();
        // update each library
     for (int i = 0; i < 10000; i++)
          printf ("Begin master update loop\n");
          void (*funcPtr2)();
          funcPtr2 = (void(*)())GetProcAddress( handle, "update");
          (*funcPtr2)();
          printf ("End master update loop\n");
          Sleep(10);
     // Sleep(100000);
     return 0;
}Main Library
#include <iostream>
#include "jni.h"
#include "MyFrame.h"
#include "StaticFunc.h"
#include <stdlib.h>
#include <vector>
#include "Windows.h"
using namespace std;
class nativelibrary
public:
     JavaVM *jvm;
     JNIEnv *env;
     jclass cls;
     jobject myFrame;
     nativelibrary();
     void locupdate();
     static vector<nativelibrary*> objects;
vector<nativelibrary*> nativelibrary::objects;
nativelibrary* createObj()
     return new nativelibrary();
nativelibrary::nativelibrary()
     // JavaVMOption options[0];
     JavaVMInitArgs vm_args;
     memset(&vm_args, 0, sizeof(vm_args));
     vm_args.version = JNI_VERSION_1_4;
     vm_args.nOptions = 0;
     vm_args.ignoreUnrecognized = true;
     vm_args.nOptions = 0;
     // vm_args.options = options;
     JavaVM** jvmBuf = (JavaVM**)malloc(sizeof(JavaVM*));
     jsize buflen = 1;
     jsize nVMs =0;
     // vm_args.options[0].optionString = "-Djava.class.path=../../bin/Debug";
     // Create the Java VM
     printf("Creating Java VM\n");
     jint res = JNI_GetCreatedJavaVMs(jvmBuf, buflen, &nVMs);
     if ( res >= 0)
          printf("No. Created VMs %i\n", nVMs);
          if ( nVMs > 0)
               jvm = jvmBuf[0];
               res = jvm->GetEnv((void**)&env,vm_args.version);
          else
               res = JNI_CreateJavaVM(&jvm,(void**)&env,&vm_args);
     else
          res = JNI_CreateJavaVM(&jvm,(void**)&env,&vm_args);
     cls = env->FindClass("LMyFrame;");
     if ( cls == 0 ) printf("Cannot find MyFrame");
     jmethodID mid = env->GetMethodID(cls, "<init>", "()V");
     if ( mid == 0 ) printf("Cannot find constructor");
     printf("Creating Frame\n");
     myFrame = env->NewObject(cls, mid);
     if (env->ExceptionOccurred())
          env->ExceptionDescribe();
     printf("Created frame\n");
     objects.push_back(this);
void nativelibrary::locupdate()
     printf("Calling Update\n");
     jmethodID updatemid = env->GetMethodID(cls, "update", "()V");
     if ( updatemid == 0 ) printf("Cannot find update");
     env->CallVoidMethod(myFrame, updatemid);
     if (env->ExceptionOccurred())
          env->ExceptionDescribe();
void update()
     vector<nativelibrary*>::iterator it = nativelibrary::objects.begin();
     while (it != nativelibrary::objects.end())
          nativelibrary* lib = *it;
          lib->locupdate();
          it++;
JNIEXPORT void JNICALL Java_MyFrame__1createObj
(JNIEnv *, jclass)
     createObj();
}Java Class (User interface)
class MyFrame
     static native void _createObj();
     static int creations = 0;
     int framenum;
     MyFrame()
          System.loadLibrary("../../nativedll/Debug/nativedll");
          framenum = creations++;
     void update()
          System.out.println("Updated Frame " + framenum);
          if ( creations == 1)
               // load dll as a result of the user clicking on the interface
               createObj();
     public static void createObj()
          _createObj();
}

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import java.io.*;
import java.awt.event.*;
import java.util.*;
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* LoginGUIdemox.java
* Created on 29 November 2002, 18:59
* @author administrator
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Attachments:
mit errors.jpg ‏20 KB

Hi Z
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error in call.JPG ‏134 KB

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Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
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Regards,
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Is there any way I can set the classpath on my browser? Are the swing components stored separately from other classes (I'm using the J2SE v1.3)?
Thanks in advance.

Without having complete information, it appears that you are running your applets using the browser's VM. Further, I assume you are using either IE or Netscape Navigator pre-v6. In that case, your browser only supports Java 1.1, and Swing was implemented in Java 1.2. You need to use the Java plug-in in order to use the Swing classes (see the Plug-in forum for more information), or else download the Swing classes from Sun and include them in your CLASSPATH.
HTH,
Carl Rapson

Loading bank accounts with invoices using Payables Open Interface Import

Dear Gurus,
We are on 11.5.10.2.
We create invoices in the 3rd party system, then load them into oracle using payables open interface import process.
When users create invoices, they choose Vendor and Site first. If the Vendor Site has multiple bank accounts assigned, users may select the one that is non-primary.
When we load the invoices into Oracle, it finds the PRIMARY account for the particular vendor site, and assigns it to the invoice.
Is it possible to load bank accounts assigned to invoices into Oracle AP?
Many Thanks,
Iana

Hi,
No issues for me on Payables Open Invoice Interface with 12.0.6 - and yes make sure you match up the invoice_id on invoice, lines interface tables.
Regards,
Gareth

How to update an existing supplier using Supplier Open Interface Import?

Hi
I need to updated an existing supplier.
Is it possible to update using supplier open interface import and how?
Thanks in advance.
Thanks,
Mallesh

Hi Atul,
I am using CCM 2.0 and SRM 5.0 (EBP5.5).
We are not using XI, so i guess we cant use the program "/ccm/file_upload".
we have migrated the product master data from R/3.
We have developed a report which takes product category as input and gives out flat file in csv format containg all the items in that prod category.
Then we upload the file in CCM by logging thro the brpwser.
Similarly, i can develop another program which will give me a CSV file foll all those items changed in R/3 in a day.
Then we can upload that file in CCM.
But i have doubt if it will update the existing items in catalog.
Hope I could make myself clear.
Thanks
Abhishek

Using Swing as interface to a dll

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