Unexpected output sequence and NPE

Question

Compile given code under Eclipse (tested on Eclipse 3.1.0, WebsphereStudio6) and then run on IBM JVM (tested on 1.4.1, 1.4.2)
Under WSAD6 after few seconds I got output sequence:
Leaving try1;0
In finally1;0
Leaving try1;0
In finally1;0
Leaving try1;0
In finally1;0
but it's imposiible if you look on the code... (or I'am ignorant in java)
If program is runned under Eclipse or standalone IBM JVM (only runned, compiled under Eclipse!!!), porogram throws NPE after few seconds and JVM is terminated.
Could anybody explain this ??
Is this bug??
For me, this is a problem, beacuse I'm working now under application, that is runnign on Websphere Application Server, and of course I'm using WSAD as IDE. And in this program I have found place, where my code hangs'up - it's going in infinite loop without any reason.
import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintStream;
import org.apache.log4j.Logger;
public class FinallyTest {
     private static IMyLogger log = new MyLogger(FinallyTest.class);
     public static void someMethod(String text){
               int count = 0;
               int code = -1;
               while (count < 2 && (code == -1 || code == 2)) {
                    count++;
                    try {
                              System.out.println("Entering try:"+count+";"+code);
                              System.out.println("Do something"+count+";"+code);
                              if (log.isDebugEnabled()) {
                                   System.out.println("Leaving try"+count+";"+code);
                         code = 0;
                    } finally {
                         if (log.isDebugEnabled()) {
                              System.out.println("In finally"+count+";"+code);
               if (log.isDebugEnabled()) {
                    System.out.println("Outering");
               if (code == 0) {
                    if (log.isDebugEnabled()) {
                         System.out.println("Before return:"+count+";"+code);
                    return;
               throw new RuntimeException(null+"a");
     public static void main(String[] args) throws Exception {
          File f = new File("out.txt");
          PrintStream ps = new PrintStream(new FileOutputStream(f));
          System.setOut(ps);
          for (;;){
               someMethod("any text");
interface IMyLogger {
     public boolean isDebugEnabled();
class MyLogger  implements IMyLogger{
     private Logger logger;
     MyLogger(Class clazz) {
          this.logger = Logger.getLogger(clazz.getName());
     public boolean isDebugEnabled() {
          return logger.isDebugEnabled();
}btw: log4j is needed, tested on 1.2.6 and 1.2.8

Answer 1

for (;;){
    someMethod("any text");
}is not source of problem!!! Infinite loops is created in method someMethod, You can change for (;;) with for (int x=1; x<10000; x++) if You wish.
Here is another simplified version (without log4j. Run this code please:
public class FinallyTest {
     private static IMyLogger log = new MyLogger(FinallyTest.class);
     public static void someMethod(String text){
               int count = 0;
               int code = -1;
               while (count < 2 && (code == -1 || code == 2)) {
                    count++;
                    try {
                              System.out.println("Entering try:"+count+";"+code);
                              System.out.println("Do something"+count+";"+code);
                              if (log.isDebugEnabled()) {
                                   System.out.println("Leaving try"+count+";"+code);
                         code = 0;
                    } finally {
                         if (log.isDebugEnabled()) {
                              System.out.println("In finally"+count+";"+code);
               if (log.isDebugEnabled()) {
                    System.out.println("Outering");
               if (code == 0) {
                    if (log.isDebugEnabled()) {
                         System.out.println("Before return:"+count+";"+code);
                    return;
               throw new RuntimeException(null+"a");
     public static void main(String[] args) throws Exception {
          for (int x=1; x<10000; x++){
               someMethod("any text");
interface IMyLogger {
     public boolean isDebugEnabled();
class MyLogger  implements IMyLogger{
     MyLogger(Class clazz) {
     public boolean isDebugEnabled() {
          return Priority.DEBUG.isGreaterOrEqual(Priority.DEBUG);
class Priority {
  int level;
  public final static int DEBUG_INT = 10000;
  final static public Priority DEBUG = new Priority(DEBUG_INT);
  protected  Priority(int level) {
    this.level = level;
  public boolean isGreaterOrEqual(Priority r) {
    return level >= r.level;
}