Way to statically initialize a class before or during MethodHandle creation, Unsafe crashes JVM

[Jochen Theodorou]

Hi all,

in another thread I was already explaining, that I do need for a certain 
method call the initialized class, to select the right method. Remi for 
example then adviced me to use Unsafe and the method 
ensureClassInitialized... well after adding that I get a nice hs_err log 
file with

> Stack: [0x00007f8fc9ae4000,0x00007f8fc9be5000],  sp=0x00007f8fc9be1520,  free space=1013k
> Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
> V  [libjvm.so+0x888857]  Unsafe_EnsureClassInitialized+0x67
> j  sun.misc.Unsafe.ensureClassInitialized(Ljava/lang/Class;)V+0
> j  org.codehaus.groovy.vmplugin.v7.Selector$MethodSelector.getMetaClass()V+63

Is this another bug? I assume it is... unless someone can explain me how 
to workaround in my workaround ;)

Anyway... since that is crashing the JVM (and it must be some special 
case) I am wondering now how I can ensure class initialization in my 
bootstrap method. Or another solution for the problem without changing 
the language.

Background is that in Groovy we may have something like this:

> class A {
>     static {
>         A.metaClass.static.empty << {-> '123' }
>     }
> }
> assert A.empty() == '123'

Since the method empty() does not exist before the static initializer is 
executed, I have to somehow enforce the execution of that, because 
otherwise the meta class will not have the empty() method.

bye Jochen

-- 
Jochen "blackdrag" Theodorou - Groovy Project Tech Lead
blog: http://blackdragsview.blogspot.com/
german groovy discussion newsgroup: de.comp.lang.misc
For Groovy programming sources visit http://groovy-lang.org