Re: 20000718: NetCDF Java Applet Capable? (fwd)

• To: "John R. Cary" <cary@xxxxxxxxxx>
• Subject: Re: 20000718: NetCDF Java Applet Capable? (fwd)
• From: John Caron <caron@xxxxxxxxxxxxxxxx>
• Date: Tue, 18 Jul 2000 16:43:44 -0600

"John R. Cary" wrote:
> 
> Hi John,
> 
> Thanks for the information.  FYI, to use most things
> I do not need to sign the applet, because I have
> added the line,
> 
>   user_pref("signed.applets.codebase_principal_support", true);
> 
> to my netscape preferences file.  (See 
> http://developer.netscape.com/docs/manuals/signedobj/capabilities/index.html.)

I see, so that allows codebases to be unsigned. Can the codebase have
any URL, or is it somehow restricted to be "within the intranet"?

> 
> This allows me to enable application privileges.  It seems that
> NetCDF requires more than just the UniversalFileAccess
> privilege, so I was hoping you might know.

hmmm, I would have thought that all you need is file access. try
catching the exception and calling e.printStackTrace(), that should
narrow it down.

> 
> Are the NetCDF mailing lists archived?

searchable, they dont seem to be browsable:

http://www.unidata.ucar.edu/glimpsedocs/ghnetcdf.html

Im pretty sure you wont see this specific problem in there.

> 
> Thanks again.....John
> 
> On Tue, 18 Jul 2000, John Caron wrote:
> 
> >
> > > >To: support@xxxxxxxxxxxxxxxx
> > > >From: "John R. Cary" <cary@xxxxxxxxxx>
> > > >Subject: NetCDF Java Applet Capable?
> > > >Organization:
> > > >Keywords: 200007181820.e6IIKsT11192
> > >
> > > I have been trying to use the NetCDF package within an applet through
> > > Netscape .4.7 on Windows.  I have enable UniversalFileAccess, but
> > > the code still dies.  My code sample is:
> > >
> > >         try {  // This must be in the same block?
> > >           netscape.security.PrivilegeManager.enablePrivilege(
> > >                 "UniversalFileAccess");
> > >           appendLine("Netscape privileges obtained.");
> > >         }
> > >         catch (NoClassDefFoundError 
> > > ex){appendLine("NoClassDefFoundError");}
> > >         catch (Exception ex){appendLine("Exception");}
> > >         appendLine("Will save to file " + fileName + " in directory " +
> > >                 sliceDir + ".");
> > >         File netCdfFile = new File(sliceDir, fileName);
> > >         appendLine("File '" + fileName + "' created.");
> > >         nc = new NetcdfFile(netCdfFile,
> > >                                 true, // clobber an existing file
> > >                                 true, // prefill variable values
> > >                                 schema // metadata template
> > >         );
> > >         appendLine("NetCDF file '" + fileName + "' created.");
> > >
> > > The code dies upon the call to NetcdfFile.  The error says only
> > > "AppletSecurityException".
> > >
> > > Is Java NetCDF applet capable within Netscape?
> > >
> > > Thanks.....John Cary
> > >
> > > --
> > > cary@xxxxxxxxxx          John R. Cary        www.techxhome.com
> > > Tech-X Corporation                           ph.  (303) 448-0728
> > > 5541 Central Avenue, Suite 135               fax  (303) 448-7756
> > > Boulder, CO 80301                            cell (303) 356-5399
> >
> > Hi John:
> >
> > Im not an expert on this, but I have been investigated applets recently.
> > One thing Im pretty sure of is that you have to sign your applets before
> > they can escape from the applet security sandbox.
> >
> > check out:
> >
> > http://java.sun.com/sfaq/
> > http://java.sun.com/security/signExample12/
> > http://java.sun.com/security/index.html
> >
> > We are currently exploring a new technology called WebStart that looks
> > promising:
> >
> > http://java.sun.com/products/javawebstart/
> >
> 
> --
> cary@xxxxxxxxxx          John R. Cary        www.techxhome.com
> Tech-X Corporation                           ph.  (303) 448-0728
> 5541 Central Avenue, Suite 135               fax  (303) 448-7756
> Boulder, CO 80301                            cell (303) 356-5399

• References:
  • Re: 20000718: NetCDF Java Applet Capable? (fwd)
    • From: John R. Cary