On Friday 24 November 2006 23:17 Tim Ellison wrote:
> Geir Magnusson Jr. wrote:
> > Tim Ellison wrote:
> >> Geir Magnusson Jr. wrote:
> >>> Isn't java.home set on vm start and immutable?
> >>
> >> No.
> >
> > "No" what?
>
> ?? It is untrue that java.home is set on vm start and immutable.
Probably Geir meant internal native VM value for java.home property. Java
program cannot change that. Even setting this property with -D command line
switch won't give any effect on drlvm because it will be overridden on the
initialization... and now that I've written it and tried to override
java.home on command line, drlvm crashed :(
The bug however seems to be in the launcher because it didn't set
org.apache.harmony.boot.class.path to any value, so the property is NULL. I'm
going to take a look (recompiling classlib with debug since it has no symbols
by default).
> e.g.
>
> public static void main(String[] args) {
> System.out.println(System.getProperty("java.home"));
> System.setProperty("java.home", "anything I want it to be");
> System.out.println(System.getProperty("java.home"));
> }
>
> produces:
>
> C:\java\IBM JDK 5.0\SR3\jre
> anything I want it to be
Yes this changes the property on java level, but VM ignores the change or it
should better do it. So on the native level the property is immutable and set
on VM startup.
--
Gregory
