Date: Thu, 26 Feb 2009 17:28:33 -0500 From: Kurt Miller <kurt@intricatesoftware.com> To: Swamy Venkataramanappa <Swamy.Venkataramanappa@Sun.COM> Cc: Brian Gardner <brian@experts-exchange.com>, bsd-port-dev@openjdk.java.net, freebsd-java@freebsd.org Subject: Re: gdb and java Message-ID: <49A71791.4030601@intricatesoftware.com> In-Reply-To: <49A7068D.7050001@sun.com> References: <49A6F84E.1080504@experts-exchange.com> <49A6FD5C.3070107@sun.com> <49A7017C.3020302@experts-exchange.com> <49A7068D.7050001@sun.com>
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Yes, that is the problem. Upon initial execution the java launcher
checks to see if the LD_LIBRARY_PATH is setup correctly. If not it
adjusts the env and execv's itself again. gdb can't follow beyond
the execv.
Setting the LD_LIBRARY_PATH to match what the launcher wants will
avoid the execv and allow gdb to work as expected.
-Kurt
Swamy Venkataramanappa wrote:
> Probably library path is not set correctly. So try this trick.
>
> public class PrintLibraryPath {
> public static void main(String[] args) {
> System.out.println(System.getProperty("java.library.path"));
> }
> }
>
>
> env LD_LIBRARY_PATH=`java PrintLibraryPath` gdb java ..
>
> -swamy
>
> Brian Gardner wrote:
>> 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)
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>
>
>
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