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    <p>We just code utility methods for each of the types of exceptions we want to throw. Here are some examples:</p> <pre><code>jint throwNoClassDefError( JNIEnv *env, char *message ) { jclass exClass; char *className = "java/lang/NoClassDefFoundError"; exClass = (*env)-&gt;FindClass( env, className); if (exClass == NULL) { return throwNoClassDefError( env, className ); } return (*env)-&gt;ThrowNew( env, exClass, message ); } jint throwNoSuchMethodError( JNIEnv *env, char *className, char *methodName, char *signature ) { jclass exClass; char *exClassName = "java/lang/NoSuchMethodError" ; LPTSTR msgBuf; jint retCode; size_t nMallocSize; exClass = (*env)-&gt;FindClass( env, exClassName ); if ( exClass == NULL ) { return throwNoClassDefError( env, exClassName ); } nMallocSize = strlen(className) + strlen(methodName) + strlen(signature) + 8; msgBuf = malloc( nMallocSize ); if ( msgBuf == NULL ) { return throwOutOfMemoryError ( env, "throwNoSuchMethodError: allocating msgBuf" ); } memset( msgBuf, 0, nMallocSize ); strcpy( msgBuf, className ); strcat( msgBuf, "." ); strcat( msgBuf, methodName ); strcat( msgBuf, "." ); strcat( msgBuf, signature ); retCode = (*env)-&gt;ThrowNew( env, exClass, msgBuf ); free ( msgBuf ); return retCode; } jint throwNoSuchFieldError( JNIEnv *env, char *message ) { jclass exClass; char *className = "java/lang/NoSuchFieldError" ; exClass = (*env)-&gt;FindClass( env, className ); if ( exClass == NULL ) { return throwNoClassDefError( env, className ); } return (*env)-&gt;ThrowNew( env, exClass, message ); } jint throwOutOfMemoryError( JNIEnv *env, char *message ) { jclass exClass; char *className = "java/lang/OutOfMemoryError" ; exClass = (*env)-&gt;FindClass( env, className ); if ( exClass == NULL ) { return throwNoClassDefError( env, className ); } return (*env)-&gt;ThrowNew( env, exClass, message ); } </code></pre> <p>That way, it's easy to find them, your code-completion editor will help you to type them in, and you can pass simple parameters.</p> <p>I'm sure you could expand this to handle chained exceptions, or other more complicated approaches. This was enough to meet our needs.</p>
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    1. COJust found this, thanks. However, won't the error condition in `throwNoClassDefError` result in infinite recursion and an inevitable stack overflow? It should really never happen, I admit, but that doesn't seem like the appropriate way to handle it. Perhaps fall back on `java.lang.error`, and `abort()` or something if that doesn't work.
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      1. USTim Sylvester
    2. COYeah, I saw that too. Agreed. I can't get my ThrowNew() calls to do _anything_, even though they return NULL (success, that is). Nothin's ever easy...
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    3. COSorry, but can anyone explain me why the throwNoClassDefError function will not fall in infinite recursion in case when the "java/lang/NoClassDefFoundError" class will not be found?
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