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

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  • Subject: Re: 20000718: NetCDF Java Applet Capable? (fwd)
  • Date: Tue, 18 Jul 2000 13:43:48 -0600 (MDT)
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.)

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.

Are the NetCDF mailing lists archived?

Thanks again.....John


On Tue, 18 Jul 2000, John Caron wrote:

> 
> > >To: address@hidden
> > >From: "John R. Cary" <address@hidden>
> > >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
> > 
> > --
> > address@hidden          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/
> 

-- 
address@hidden          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