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From "Evgueni Brevnov" <evgueni.brev...@gmail.com>
Subject Re: [drlvm] VM throws NullPointerException in case java.class.path is not set
Date Tue, 10 Oct 2006 10:50:35 GMT
Oliver,

You have provided strong arguments that RI uses current directory by
default. I think it makes sense to be compatible with RI in this
particular case.

Thanks
Evgueni

On 10/10/06, Oliver Deakin <oliver.deakin@googlemail.com> wrote:
> I have just tried launching the RI with a simple launcher (very basic -
> CreateJavaVM(),
> finds and launches a class, then calls DestroyJavaVM()). The launcher
> does not
> set java.class.path, and executes the main method of the following class:
>
>   public class SysInfo {
>       public static void main(String[] args) {
>                   System.getProperties().list(System.out);
>       }
>   }
>
> The java.class.path value is printed as:
>
>  java.class.path=
>
> So it appears that java.class.path property is left empty by default.
> However,
> to have found the SysInfo class, the RI must have searched in the current
> directory. I can also instantiate other classes that are located in the
> current
> directory. So although the java.class.path is set to an empty string,
> internally
> there is a default inclusion of the current directory.
>
> IMHO we follow the RI behaviour here, and have an implicit inclusion of
> the current directory unless the classpath is explicitly set.
>
> Regards,
> Oliver
>
>
> Evgueni Brevnov wrote:
> > It seems for me like pretty specified VM behavior to treat classpath
> > absence as take classes from current directory. At least RI does like
> > that when you don't specify classpath on command line.
> >
> > Evgueni
> >
> > On 10/10/06, Mikhail Fursov <mike.fursov@gmail.com> wrote:
> >> Another solution could be a simple shutdown with the valid error
> >> message.
> >> Sometimes the error message is better than hidden behaviour.
> >> So the alternative is to check all properties VM needs before running
> >> real
> >> startup and fail if some of the properties are not found.
> >>
> >>
> >> On 10/10/06, Evgueni Brevnov <evgueni.brevnov@gmail.com> wrote:
> >> >
> >> > Hi All,
> >> >
> >> > Currently DRLVM starts with help of the launcher. The launcher does a
> >> > lot of stuff required to create VM instatnce. As a part of its job it
> >> > sets up java.class.path property. And this is good. What is not good
> >> > that DRLVM crashes (actually throws NullPointerException in
> >> > initalization stage) if java.class.path is not set. I believe it makes
> >> > sense to point java.class.path to current directory inside VM if
> >> > launcher doesn't set it.
> >> >
> >> > What do u think?
> >> >
> >> > Thanks
> >> > Evgueni
> >> >
> >> > ---------------------------------------------------------------------
> >> > Terms of use : http://incubator.apache.org/harmony/mailing.html
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> >> >
> >> >
> >>
> >>
> >> --
> >> Mikhail Fursov
> >>
> >>
> >
> > ---------------------------------------------------------------------
> > Terms of use : http://incubator.apache.org/harmony/mailing.html
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> >
> >
>
> --
> Oliver Deakin
> IBM United Kingdom Limited
>
>
> ---------------------------------------------------------------------
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>
>

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