Error: Javaw.exe has stopped working

Question

I'm using Java 1.3 in my application to do audio recording. It works for on all Windows except Windows Vista. I get the below error message when I try to stop my recording. Can someone please help.
Problem signature:
Problem Event Name:     APPCRASH
Application Name:     javaw.exe
Application Version:     0.0.0.0
Application Timestamp:     390bb529
Fault Module Name:     ntdll.dll
Fault Module Version:     6.0.6000.16386
Fault Module Timestamp:     4549bdc9
Exception Code:     c0000005
Exception Offset:     0003b15f
OS Version:     6.0.6000.2.0.0.768.3
Locale ID:     1033
Additional Information 1:     b6c7
Additional Information 2:     22e2ce78ecf3f4e8b10531f8c52d0796
Additional Information 3:     6b21
Additional Information 4:     63a1dbc3398a6e706290e74c454f442a

Answer 1

Here is the updated code. I'll go through testing. If it works, I'll award you the dukes.
JNIEXPORT jstring JNICALL Java_com_Platform_getWindowTitle(JNIEnv *env, jobject obj, jlong hwnd) {
    HWND handle = (HWND)hwnd;
    if(handle) {
        int titleLength = GetWindowTextLength(handle); //Windows 95 or later
        if(titleLength > 0) { //GetWindowTextLength could return 0
            LPTSTR title = (LPTSTR)malloc(titleLength*sizeof(TCHAR)); //Windows 95 or later
            if(title != NULL && GetWindowText(handle,title,titleLength+1) != 0) { //Windows 95 or later
                jstring winTitle = (*env)->NewStringUTF(env, title);
                free(title);
                return winTitle;
            free(title);
    return 0;
}