Op Sun, 07 Dec 2008 23:21:12 +0100 schreef Syl gmail.com>:

Why would you want to simulate a JVM? What's wrong with a real JVM?

When instrumenting classes, the docs for
Instrumentation.redefineClasses states "The redefinition must not
add, ... methods,"

While I can see why certain method adding scenarios could lead to
trouble, I'm trying to add an override of Object.equals() in a
subclass which does not override equals(). I can't think of a good
reason why the instrumentation engine should prevent this kind of
"adding" of a method, as the change would seem to be benign and
compatible.

Any ideas how to circumvent this restriction? The docs state that some
of these restrictions may be lifted in the future, so just wondering
whether it could already be done now, albeit in a non-standard manner.

When looking at the CodeAttribute for valueOf(long) in Long.class (JRE
1.6.0_10), the file states that max_locals is 3.

Yet when looking at the bytecode for the method, the highest local
variable index used by the code is 0 (in the lload_0 instructions).
Since the variable is a long, that, to me, would give this static
method a max_locals of 2, not 3.

When looking at the source code,

public static Long valueOf(long l) {
final int offset = 128;
if (l >= -128 && l <= 127) { // will cache
return LongCache.cache[(int)l + offset];
}
return new Long(l);
}

.. there is the "offset" local variable.. but the compiler does not
require a local variable slot for it, since it is a constant.

So does the max_locals CodeAttribute field deal with the "source code
view" of local variables, or with the JVM view of local variables?

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Hi,

Please tell me if I am posting to the wrong group..

We are running a SAP Portal/Oracle system in Win2003 on Sun JDK
1.4.2_17.
We have 2 servers, with the following JDK parameters:

-XX:MaxNewSize=160M
-XX:NewSize=160M
-XX:MaxPermSize=270M
-XX:PermSize=270M
-Xmx1024M
-Xms1024M

When MaxPermSize and PermSize are increased (Say, say, 280M from
270M),
the Java VM crashes as the SAP portal starts. (SAP successfully
starts with the parameters mentioned).