Filter
Top Products
System.out.println("Call dumpCore to convert " + ci +
" to a binary string!");
System.out.println("The binary String: " + StackTrace.dumpCore(ci));
} // end methodMakeCall
//**************************************************
public static void main(String args[]) {
int convertInt;
System.out.println();
if(args.length == 1) {
convertInt = Integer.parseInt(args[0]);
}
else {
convertInt = 757;
}
System.out.println("Calling method1()");
StackTrace.method1(convertInt);
System.out.println("Back in main, all done!");
} // end main
} // end StackTrace
4.1.3 stacktrace.c
// File stacktrace.c
#include "StackTrace.h"
#include <stdio.h>
JNIEXPORT jstring JNICALL
Java_StackTrace_dumpCore(JNIEnv *env, jclass class, jint intarg) {
jclass classid;
jmethodID methodid;
printf("In dumpCore\n");
// Problem code. The Class: java.lang.IntegerX does not exist,
// but the exception is cleared and the program continues.
// Ultimately, failing and dumping core when getting the methodid.
// To fix, comment out the following 2 lines.
// /*
classid = (*env)->FindClass(env, "java/lang/IntegerX");
(*env)->ExceptionClear(env);
// */
// Working code. The Class: java.lang.Integer exists. The lines
// following the FindClass manage printing out of a stack trace,
// clearing an exception, and returning to the java main when
// FindClass fails.
//
// Uncomment the following 6 lines and rebuild to see the program work!
/*
classid = (*env)->FindClass(env, "java/lang/Integer");
(*env)->ExceptionDescribe(env);
(*env)->ExceptionClear(env);
if(classid == NULL) {
return (*env)->NewStringUTF(env, "JNI FindClass failed!");
}
*/
methodid = (*env)->GetStaticMethodID(env, classid, "toBinaryString",
4.1 Sample Java Application 63