Name: skT88420 Date: 11/02/99


java version "1.2.2"
Classic VM (build JDK-1.2.2-W, native threads, symcjit)
The default class loader fails with a NullPointerException, if the classpath is
pointing to a network drive and the network connection broke down and was
recovered afterwards. This effect only occurs if the JIT is switched on.

Steps to reproduce:
- save and compile the test code "Test.java" below (on machine 1)
- map a network drive on another machine (2) to the directory where the class
files are stored
- start the program on the machine 2 with: "java -classpath (drive pointing to
machine 1) Test"
- unplug the network cable from machine 2 --> the program displays
NoClassDefFoundErrors, which is correct
- plug in the network cable for machine 2 again --> the program now displays
NullPointerExceptions.

The NullPointerExceptions do not occur if the JIT was switched off before
starting the program (with "set java_compiler=blabla"). In this case, the
program continues its execution correctly.

Here is the test code (the large number of classes is just to have some time to
play with the network cable):


public class Test
{
    public static void main(String[] args)
    {
        // start with a class "Demo0"
        Demo d = new Demo0();

        while (true)
        {
            try
            {
                System.out.print("executing class " + d.getClass().getName()
+ "... ");
                // force the class loader to load the next class
                d = d.execute();
                System.out.println("okay");
            }
            catch (Throwable ex)
            {
                ex.printStackTrace();
            }
            try {Thread.sleep(3000);}
            catch (InterruptedException ie) {}
        }
    }
}

abstract class Demo{abstract Demo execute();}

class Demo0 extends Demo {Demo execute(){return new Demo1();}}
class Demo1 extends Demo {Demo execute(){return new Demo2();}}
class Demo2 extends Demo {Demo execute(){return new Demo3();}}
class Demo3 extends Demo {Demo execute(){return new Demo4();}}
class Demo4 extends Demo {Demo execute(){return new Demo5();}}
class Demo5 extends Demo {Demo execute(){return new Demo6();}}
class Demo6 extends Demo {Demo execute(){return new Demo7();}}
class Demo7 extends Demo {Demo execute(){return new Demo8();}}
class Demo8 extends Demo {Demo execute(){return new Demo9();}}
class Demo9 extends Demo {Demo execute(){return new Demo10();}}
class Demo10 extends Demo {Demo execute(){return new Demo11();}}
class Demo11 extends Demo {Demo execute(){return new Demo12();}}
class Demo12 extends Demo {Demo execute(){return new Demo13();}}
class Demo13 extends Demo {Demo execute(){return new Demo14();}}
class Demo14 extends Demo {Demo execute(){return new Demo15();}}
class Demo15 extends Demo {Demo execute(){return new Demo16();}}
class Demo16 extends Demo {Demo execute(){return new Demo17();}}
class Demo17 extends Demo {Demo execute(){return new Demo18();}}
class Demo18 extends Demo {Demo execute(){return new Demo19();}}
class Demo19 extends Demo {Demo execute(){return new Demo20();}}
class Demo20 extends Demo {Demo execute(){return new Demo21();}}
class Demo21 extends Demo {Demo execute(){return new Demo22();}}
class Demo22 extends Demo {Demo execute(){return new Demo23();}}
class Demo23 extends Demo {Demo execute(){return new Demo24();}}
class Demo24 extends Demo {Demo execute(){return new Demo25();}}
class Demo25 extends Demo {Demo execute(){return new Demo26();}}
class Demo26 extends Demo {Demo execute(){return new Demo27();}}
class Demo27 extends Demo {Demo execute(){return new Demo28();}}
class Demo28 extends Demo {Demo execute(){return new Demo29();}}
class Demo29 extends Demo {Demo execute(){return new Demo30();}}
class Demo30 extends Demo {Demo execute(){return new Demo31();}}
class Demo31 extends Demo {Demo execute(){return new Demo32();}}
class Demo32 extends Demo {Demo execute(){return new Demo33();}}
class Demo33 extends Demo {Demo execute(){return new Demo34();}}
class Demo34 extends Demo {Demo execute(){return new Demo35();}}
class Demo35 extends Demo {Demo execute(){return new Demo36();}}
class Demo36 extends Demo {Demo execute(){return new Demo37();}}
class Demo37 extends Demo {Demo execute(){return new Demo38();}}
class Demo38 extends Demo {Demo execute(){return new Demo39();}}
class Demo39 extends Demo {Demo execute(){return new Demo40();}}
class Demo40 extends Demo {Demo execute(){return new Demo41();}}
class Demo41 extends Demo {Demo execute(){return new Demo42();}}
class Demo42 extends Demo {Demo execute(){return new Demo43();}}
class Demo43 extends Demo {Demo execute(){return new Demo44();}}
class Demo44 extends Demo {Demo execute(){return new Demo45();}}
class Demo45 extends Demo {Demo execute(){return new Demo46();}}
class Demo46 extends Demo {Demo execute(){return new Demo47();}}
class Demo47 extends Demo {Demo execute(){return new Demo48();}}
class Demo48 extends Demo {Demo execute(){return new Demo49();}}
class Demo49 extends Demo {Demo execute(){return new Demo50();}}
class Demo50 extends Demo {Demo execute(){return new Demo51();}}
class Demo51 extends Demo {Demo execute(){return new Demo52();}}
class Demo52 extends Demo {Demo execute(){return new Demo53();}}
class Demo53 extends Demo {Demo execute(){return new Demo54();}}
class Demo54 extends Demo {Demo execute(){return new Demo55();}}
class Demo55 extends Demo {Demo execute(){return new Demo56();}}
class Demo56 extends Demo {Demo execute(){return new Demo57();}}
class Demo57 extends Demo {Demo execute(){return new Demo58();}}
class Demo58 extends Demo {Demo execute(){return new Demo59();}}
class Demo59 extends Demo {Demo execute(){return new Demo60();}}
class Demo60 extends Demo {Demo execute(){return new Demo61();}}
class Demo61 extends Demo {Demo execute(){return new Demo62();}}
class Demo62 extends Demo {Demo execute(){return new Demo63();}}
class Demo63 extends Demo {Demo execute(){return new Demo64();}}
class Demo64 extends Demo {Demo execute(){return new Demo65();}}
class Demo65 extends Demo {Demo execute(){return new Demo66();}}
class Demo66 extends Demo {Demo execute(){return new Demo67();}}
class Demo67 extends Demo {Demo execute(){return new Demo68();}}
class Demo68 extends Demo {Demo execute(){return new Demo69();}}
class Demo69 extends Demo {Demo execute(){System.exit(0); return null;}}
(Review ID: 97337)
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