<AWT Dev> [8] Review request for 8014264: The applet pathguy_TimeDead throws java.lang.NullPointerException in java console once click drop-down check box.

[Leonid Romanov]

If by Toolkit thread you mean the thread that is responsible for 
obtaining and dispatching platform events, then no, you can't use 
invokeLater here. The more general rule is that you can't use 
invokeLater in the main thread group (to which Toolkit thread belongs to).

On 6/11/2013 5:53 PM, Sergey Bylokhov wrote:
> Hi, Leonid.
> Does it mean that we cannot use InvokeAndW/Later on the toolkit thread?
>
> On 11.06.2013 12:48, Leonid Romanov wrote:
>> Hi,
>> Please review a fix for 8014264: The applet pathguy_TimeDead throws 
>> java.lang.NullPointerException in java console once click drop-down 
>> check box.
>> The problem here is that for applets prePostEvent is called within 
>> ThreadGroup that, by design, has no AppContext associated with it. 
>> So, when the code in XChoicePeer/XListPeer prePostEvent 
>> implementation calls EventQueue.invokeLater, it results in NPE 
>> because there is no EQ for this ThreadGroup.
>> The fix is not to use invokeLater, but to manually create 
>> InvocationEvent to ensure that target's AppContext would be used to 
>> find an EQ for the event to go into.
>>
>> Bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8014264
>> Webrev: http://cr.openjdk.java.net/~leonidr/8014264/webrev.00/ 
>> <http://cr.openjdk.java.net/%7Eleonidr/8014264/webrev.00/>
>>
>> Thanks,
>> Leonid.
>>
>
>