Re: [Java Spec Report] Re: Infinite loop created by javac

On Fri, 30 Jul 2004 15:18:11 -0000, danhicksbyron
<[email protected]> wrote:
> But the JVM spec requires that the monitorexit throw exceptions in two
> cases where nothing can ever be unlocked -- null pointer and no lock
> held on the object.  Never mind how the situation got broken (possibly
> by a JNI routine or non-javac code), this construct is essentially
> guaranteeing an infinite loop.

If you look at the generated code, you'll see that the null pointer
can't happen because the monitor enter didn't throw a null pointer
exception on the same reference value.

It is certainly true that you can write and invoke JNI code or code
from a broken compiler that when executed causes the thread to enter
an infinite loop.  In fact, you can simply write an infinite loop in
Java if you want.  That doesn't bother me.


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