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Date: Thu, 26 Feb 2009 12:54:20 -0800
From: Brian Gardner <brian@experts-exchange.com>
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To: Swamy Venkataramanappa <Swamy.Venkataramanappa@Sun.COM>
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Cc: bsd-port-dev@openjdk.java.net, freebsd-java@freebsd.org
Subject: Re: gdb and java
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Thanks Swamy,
Same thing happens using java directly. 

Swamy Venkataramanappa wrote:
>
> jmap is actually a java program. jmap executable is simple launcher 
> just like a java launcher.
> It launches java program and runs JMap.class from sa-jdi.jar or runs 
> attach on demand
> code and attaches to the running jvm.  SA based jmap can be run like this
>
> java -classpath <jdkhome>/sa-jdi.jar  sun.jvm.hotspot.tools.JMap  
> -finalizerinfo <pid>
>
> -Swamy
>
> Brian Gardner wrote:
>> I've had success in debugging java using jdb, however this doesn't 
>> seem to support native debugging.  I'd like to use gdb but this 
>> doesn't work with (the error is bellow).  Currently I'm printing to 
>> stderr from native code but this is less than ideal and time 
>> consuming, any ideas?
>>
>> # gdb jmap
>> (gdb) run -finalizerinfo 118
>> Starting program: 
>> /usr/home/brian/openjdk6/freshv2.2/bsd-port6.modified/build/bsd-amd64/j2sdk-image/bin/jmap 
>> -finalizerinfo 118
>> (no debugging symbols found)...(no debugging symbols found)...[New 
>> LWP 104363]
>> (no debugging symbols found)...(no debugging symbols found)...[New 
>> Thread 0x800b01120 (LWP 104363)]
>> [New LWP 104363]
>>
>> Program received signal SIGTRAP, Trace/breakpoint trap.
>> [Switching to LWP 104363]
>> Cannot remove breakpoints because program is no longer writable.
>> It might be running in another process.
>> Further execution is probably impossible.
>> 0x000000080050d360 in ?? () from /libexec/ld-elf.so.1
>> (gdb)
>>
>>
>>
>>   
>
>