Re: Probel with running jswat, java.lang.NullPointerException thrown during JVM load.

That is a good question. I do not have any particular solution. However,
a MacOS X user had a problem related to the host name (as it appears you
have here). His solution was to add the name of his machine to the
netinfo file. In your case, that would be the /etc/hosts file. On my
work system (RedHat Linux 7.3), my /etc/hosts file looks like this:

127.0.0.1		localhost.localdomain localhost

While at home my (nearly identical) system has:

127.0.0.1		localhost chip
192.168.0.2		chip

Maybe if you modify your /etc/hosts file to be something like mine, it
will work.

n

P.S. Yes, even when launching the debuggee from JSwat, the JPDA still
uses sockets to communicate between the debugger and the debuggee. That
is why it is looking up the host name (and apparently failing).


On Thu, 2003-03-13 at 11:58, Tomasz Sztejka wrote:
> Hi, 
>  I have downloaded Jswat and trying to get it run under Linux. My
> system is:
> - Linux Debian 3.0;
> - j2sdk 1.4.1 from BlackDown.org
> 
> Once I start Jswat, choose to open new session with "tutorial" class
> file I'm getting on console window following exception report:
> 
> java.lang.NullPointerException
>         at java.net.InetAddress.cacheAddress(InetAddress.java:648)
>         at java.net.InetAddress.cacheAddress(InetAddress.java:633)
>         at
> java.net.InetAddress.getAddressFromNameService(InetAddress.java:1016)
>         at java.net.InetAddress.getLocalHost(InetAddress.java:1125)
>         at
> com.sun.tools.jdi.SocketTransport.startListening(SocketTransport.java:91)
>         at
> com.sun.tools.jdi.SocketTransport.startListening(SocketTransport.java:86)
>         at
> com.sun.tools.jdi.SunCommandLineLauncher.launch(SunCommandLineLauncher.java:105)
>         at
> com.bluemarsh.jswat.VMConnection.launchDebuggee(VMConnection.java:438)
>         at
> com.bluemarsh.jswat.action.VMStartAction.actionPerformed(VMStartAction.java:219)
>         at (... part removed for clarity)
> java.awt.EventDispatchThread.run(EventDispatchThread.java:99)
> 
> Does anyone knows what should I do to get it run? With windows98 JSwat
> was running nice, so it is probably something wrong with my system
> config.
> Any advice will be welcommed. 
>  regards,
>    Tomasz Sztejka.