Name: akC45999 Date: 09/08/98



The section "6.4 The Java Virtual Machine Instruction Set" of JVM specification
says about linking exeptions for invokespecial instruction:

" ... if the resolved method is a class (static) method, the
invokespecial instruction throws an IncompatibleClassChangeError."

But JDK1.2fcsI JVM on Solaris(jit) throws NullPointerException instead.


SOURCE:
------------------------------------- file invokespecial01801m1.java
// simplified version of the test invokespecial01801m1

import java.io.PrintStream;

public class invokespecial01801m1 {

public static int run(String argv[], PrintStream out) {

Class expectedException = IncompatibleClassChangeError.class;
String badClassName = "invokespecial01801m11n";
Class badClass = null;

try {
badClass = Class.forName(badClassName);
try {
Object obj=badClass.newInstance();
} catch (Throwable e) {
if (expectedException.isInstance(e)) {
out.println("Passed with runtime exception: " + e);
return 0/*STATUS_PASSED*/;
} else {
out.println("Failed with unexpected runtime exception: " + e);
return 2/*STATUS_FAILED*/;
}
}
} catch (ClassNotFoundException e) {
out.println("Passed with loading exception: " + e);
return 0/*STATUS_PASSED*/;
}
return 2/*STATUS_FAILED*/;
}

public static void main(String args[]) {
System.exit(run(args, System.out) + 95/*STATUS_TEMP*/);
}

}

------------------------------------- end of file invokespecial01801m1.java

and

------------------------------------- file invokespecial01801m11n.jasm

public class invokespecial01801m11n {

 static Method proc2:"()V" // wrong
stack 2 locals 5
{
return;
}

public Method <init>:"()V"
stack 2 locals 1
{
aload_0;
invokespecial Method java/lang/Object.<init>:"()V";
aload_0;
invokespecial Method proc2:"()V";
  return;
}

} // end Class invokespecial01801m11n

------------------------------------- end of file invokespecial01801m11n.jasm

LOG:

novo50%java -fullversion
java full version "JDK-1.2fcs-I"

// Running the test with JIT:
novo50%java -verify invokespecial01801m1
Failed with unexpected runtime exception: java.lang.NullPointerException

// Running the test without JIT:
novo50% setenv JAVA_COMPILER none
java -verify invokespecial01801m1
Warning: JIT compiler "none" not found. Will use interpreter.
Passed with runtime exception: java.lang.IncompatibleClassChangeError: invokespecial01801m11n: method proc2()V did not used to be static

----------------------------------------- end of log

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