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package hello;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
public class HelloWorld {
public void println () {
System.out.println("Hello World!");
}
private void testStackTrace () throws IOException {
try {
println();
}
catch (Exception ex) {
printRelevantStackEntries(ex,getClass().getName());
}
}
private static void printRelevantStackEntries (Exception ex, String className) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream ps = new PrintStream(baos);
ex.printStackTrace(ps);
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
BufferedReader br = new BufferedReader(new InputStreamReader(bais));
String entry;
while ((entry = br.readLine()) != null) {
if (entry.indexOf(className) != -1) {
System.err.println(entry);
}
}
}
public static void main(String[] args) throws Exception {
new HelloWorld().testStackTrace();
}
}
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