Re: modifying java.lang.String.java

danwichs@[EMAIL PROTECTED]
 wrote:
>  I'm trying to modify java.lang.String.java and add the modified
> String.class to
> rt.jar [THIS IS FOR MYSELF ONLY AND WILL NOT BE DEPLOYED].
> I cannot add "private final boolean tainted[] = new

Wouldn't it be easier to use WeakHashMap<String,boolean[]> (or something 
similar with the map value as a meaningful class type)?

> boolean[5];" to String.java. If I do, it still compiles and I can add
> it to rt.jar and compile a test program against it. However, the JVM
> crashes with a strange message:
> 
>  java.lang.IllegalArgumentException: name can't be empty
>        at java.security.BasicPermission.init(Unknown Source)
>        at java.security.BasicPermission.<init>(Unknown Source)
>        at java.lang.RuntimePermission.<init>(Unknown Source)
>        at java.lang.Thread.<clinit>(Unknown Source)

So if you look at the source, it appears that the literal string
"enableContextClassLoaderOverride" has a length of zero.

As someone else mentioned it will be in the native code loading strings 
from class files. The exact details I don't know. Moving your field 
after the existing fields might help. It might be that reference fields 
are treated differently to primitive fields for object layout.

I suggest your approach is probably poor.

Tom Hawtin