[antlr-interest] ANTLRWorks - Java null pointer exception

Terence Parr parrt at cs.usfca.edu
Mon Dec 13 10:20:42 PST 2010


I have identified this exception as the problem preventing debugging... I will push out 1.4.2 within a day or so.

Can I send you directly a test jar?
Ter
On Dec 12, 2010, at 1:48 PM, Vincent De Groote wrote:

> Hello,
> 
> I downloaded today the ANTLRWORKS-1.4.1 package (antlrworks-1.4.1.jar).
> 
> I started the jar file with
> 
> java -jar ../Downloads/antlrworks-1.4.1.jar
> 
> When I use the sample expr grammar found on antlr site, the debugger
> stops working a few steps after the beginning with java null pointer
> exceptions on the console screen:
> 
> 
> [---- CONSOLE OUTPUT
> --------------------------------------------------------------------------] 
> 
> Checking Grammar expr.g...
> 
> Note: /home/vdg/antlr-test/output/exprParser.java uses unchecked or
> unsafe operations.
> 
> Note: Recompile with -Xlint:unchecked for details.
> 
> Note: /home/vdg/antlr-test/output/exprParser.java uses unchecked or
> unsafe operations.
> 
> Note: Recompile with -Xlint:unchecked for details.
> 
> java.lang.NullPointerException
> java.lang.NullPointerException
> 	at
> org.antlr.runtime.debug.RemoteDebugEventSocketListener.dispatch(RemoteDebugEventSocketListener.java:275)
> 	at
> org.antlr.runtime.debug.RemoteDebugEventSocketListener.eventHandler(RemoteDebugEventSocketListener.java:176)
> 	at
> org.antlr.runtime.debug.RemoteDebugEventSocketListener.run(RemoteDebugEventSocketListener.java:472)
> 	at java.lang.Thread.run(Thread.java:636)
> 
> [---- CONSOLE OUTPUT: end
> --------------------------------------------------------------------------]
> 
> 
> I have the same result with another grammar I downloaded from the site.
> 
> Any idea ?
> 
> Thanks for your help
> 
> Vincent De Groote
> 
> 
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