IcedTea6-plugin PluginAppletSecurityContext NullPointers

[Xerxes Rånby]

Xerxes Rånby wrote:
> Hello oliver!
>
> Oliver May wrote:
>> Hi all!
>>
>> I am having some difficulties with icedtea-6-plugin on debian 
>> (armel). I am working on a java applet for communication between a 
>> browser (iceweasel) and hardware (gpsd) on the neo freerunner phone.
>>
> Do you have a url to this applet and its sourcecode? without it it is 
> really hard to see whats going on.
> It would be great if you happen to have a small testcase based on code 
> from the applet that exposes this bug so that it can be fixed properly 
> on  ARM armel platforms.
>> The problem lies mainly in the communication between the browser and 
>> the applet, I am calling java methods from javascript code. Whenever 
>> I try to call a method on a java object I get following errors:
>>
>> java.lang.NullPointerException:
>>     at 
>> sun.applet.PluginAppletSecurityContext.checkPermission(PluginAppletSecurityContext.java:1002) 
>>
>>     at 
>> sun.applet.PluginAppletSecurityContext.handleMessage(PluginAppletSecurityContext.java:658) 
>>

Deepak where do the PluginDebug.debug post its debug messages? It might 
shine some light on what calling method is used on what object in 
checkPermission above.

*snip from PluginAppletSecurityContext.java:658*
              PluginDebug.debug("Calling method " + m + " on object " + o
                                                + " with " + arguments);

                                AccessControlContext acc = callContext 
!= null ? callContext : getClosedAccessControlContext();
                                checkPermission(src, o.getClass(), acc);
*snap*


>>     at 
>> sun.applet.AppletSecurityContextManager.handleMessage(AppletSecurityContextManager.java:31) 
>>
>>     at 
>> sun.applet.PluginStreamHandler.handleMessage(PluginStreamHandler.java:248) 
>>
>>     at 
>> sun.applet.PluginMessageHandlerWorker.run(PluginMessageHandlerWorker.java:34) 
>>
>>
>> Occasionally I also get following error:
>> IcedTeaPlugin.cc:4735: Error: parse int
>>

In IcedTeaPlugin.cc:4735  a lookup to a object seems to have failed in 
your case. We need to know what string was used here for the lookup.
I dont want to guess but the errors you have experienced might be related.

*snip from PluginAppletSecurityContext.java:4735*
  case jobject_type:
      // Have we referred to this object before?
      id = str.ToInteger (&conversionResult);
      PLUGIN_CHECK ("parse int", conversionResult);
      retval.l = factory->references.ReferenceObject (id);
      break;
*snap*


Cheers and have a great day!
Xerxes