Chuck Rasbold got an error while running -Xcheck:jni on ECperf
which might be incorrect. I had run the JCK tests with -Xcheck:jni
and believe I saw the same problem (so running the JCKs might
be a smaller test case).

The error is "JNI received a class argument that is not a class"
from isAssignableFrom.

I believe the problem is in the ValidateClass method of jniCheck.cpp.
If a primitive class is sent in, the mirror is null. I think there should
be a check for java_lang_Class::is_primitive in that method.


Name: rmT116609 Date: 02/20/2002


FULL PRODUCT VERSION :
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)

Patched RedHat 7.1 glibc-2.2.4-20 kernel 2.4.7-10

DESCRIPTION OF THE PROBLEM :

Class.isAssignableFrom(c);
where c represents simple type will fail when run with -Xcheck:jni, with
FATAL ERROR in native method: JNI received a class argument
that is not a class

REGRESSION. Last worked in version 1.3.1

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. javac test.java
2. java -Xcheck:jni test

EXPECTED VERSUS ACTUAL BEHAVIOR :
That's what happens on 1.3.1

java -Xcheck:jni test
Field[0] public int test.intField
IsAssignable: false
Field[1] public short test.shortField
IsAssignable: false
Field[2] public java.lang.Short test.shortObjectField
IsAssignable: true


ERROR MESSAGES/STACK TRACES THAT OCCUR :
FATAL ERROR in native method: JNI received a class argument that is not a class
at java.lang.Class.isAssignableFrom(Native Method)
at test.main(test.java:14)



This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class test
{
public int intField;
public short shortField;
public Short shortObjectField;

public static void main(String[] params) throws Exception
{
java.lang.reflect.Field[] fields = test.class.getFields();
for(int i=0; i<fields.length; i++)
{
System.out.println("Field[" + i + "] " + fields[i]);
Class c = fields[i].getType();
System.out.println("IsAssignable: " + Object.class.isAssignableFrom(c));
}

}
}
---------- END SOURCE ----------
(Review ID: 139924)
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