Re: java.security.AccessControlException opening from an applet

It would be useful to see the complete stack trace. It looks like you are 
trying to read a local file?? As Tom said, applets dont have that right.

Tom Whittaker wrote:
> Santi:
>
> In general, applets are not permitted to communicate with a host other
> than the one they were loaded from.  In previous JVMs, this rule when
> using a local URL was relaxed.  In later versions of Java it is more
> strictly enforced (as it always has been for loading applets from
> remote hosts).
>
> You might (I havent tried it) be able to use the
> AccessController.doPrivileged() method to enable this -- I just don't
> know if it would pop-up a user dialog for each I/O though.  Some more
> info at:
> <http://www.raditha.com/java/sandbox/unsigned.php>
>
> Regards,
>
> tom
>
> On 4/24/06, S Santos <address@hidden> wrote:
>
> > Hello,
> >
> > I'm developing a tool to display netCDF files. The program has two versions,
> > a desktop one and an applet version. When I load from a URL using the applet
> > version java throws this exception:
> >
> > java.security.AccessControlException: access denied
> > (java.io.FilePermission
> > http%3A%2F%2Flocalhost%3A8080%2Fsoftiam-portal%2Fusers%2Fe145%2FIPCC_ESM+Magicc_SCM%2Fmagicc_out.nc
> > read)
> > at
> > java.security.AccessControlContext.checkPermission(Unknown
> > Source)
> > at java.security.AccessController.checkPermission(Unknown
> > Source)
> > at java.lang.SecurityManager.checkPermission(Unknown
> > Source)
> > at java.lang.SecurityManager.checkRead(Unknown Source)
> > at java.io.RandomAccessFile.<init>(Unknown Source)
> > at java.io.RandomAccessFile.<init>(Unknown Source)
> > at
> > ucar.unidata.io.RandomAccessFile.<init>(RandomAccessFile.java:134)
> > at ucar.nc2.NetcdfFile.open(NetcdfFile.java:217)
> > at ucar.nc2.NetcdfFile.open(NetcdfFile.java:167)
> > at ucar.nc2.NetcdfFile.open(NetcdfFile.java:151)
> > at
> > softiam.services.ui.dataAnalysis.util.NetCDFReader.<init>(NetCDFReader.java:42)
> > at
> > softiam.services.ui.dataAnalysis.engine.SoftiamRepresentation.setNetCDFFile(SoftiamRepresentation.java:130)
> > at
> > softiam.services.ui.dataAnalysis.tool.SoftiamAnalyzer.loadURL(SoftiamAnalyzer.java:630)
> > at
> > softiam.services.ui.dataAnalysis.tool.SoftiamAnalyzerApplet.init(SoftiamAnalyzerApplet.java:38)
> > at sun.applet.AppletPanel.run(Unknown Source)
> > at java.lang.Thread.run(Unknown Source)
> >
> > The system uses netCDF 2.2.14 version with slf4j-simple.jar and
> > log4j-1.2.13.jar for Http connections. In a previous version using netCDF
> > 2.1.10 this problem didn't happen. Is there any solution to this problem
> > without having to change java security policy files?
> >
> > Regards,
> >
> > Santi
> >
> >
> > Santiago de la Nava Santos
> > Software Engineer
> > Tyndall Centre
> > Zuckermann Institute
> > University of East Anglia
> > Norwich NR4 7TJ
> >
> > Telephone 01603 591377
> > Fax 01603 593901
> > E-mail address@hidden
>
>
>
> --
> Tom Whittaker
> University of Wisconsin-Madison
> SSEC/CIMSS
> 1225 W. Dayton Street
> Madison, WI  53706  USA
> ph: 608-262-2759
>
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