How to debug hotspot integrated with java codes

[Xiaobin Lu]

Hi Colin,

It looks like the process hang when it tried to load some classes. Did 
the application work without dbx attached to it?

Along the link I sent to you, there is a link 
(http://developers.sun.com/solaris/articles/Java_debug/Java_debug_content.html) 
which tells you how to debug Java process, please take a look at it. We 
have a script to launch dbx internally and it takes care of the 
LD_LIBRARY_PATH problem as well. I am attaching it in the email. You can 
start that script as the following:

dbxr <path to java executable> -server (or -client which loads the 
server or client VM)

-Xiaobin

On 12/15/08 10:57, Colin(Du Li) wrote:
> Hi, Xiaobin,
>
> I tried dbx, but dbx will hang after echo "reading libzip.so" as below:
>   
>> $ dbx $LD_LIBRARY_PATH/gamma 
>>     
> For information about new features see `help changes'
> To remove this message, put `dbxenv suppress_startup_message 7.6' in your
> .dbxrc
> Reading gamma
> Reading ld-linux.so.2
> Reading libjvm.so
> Reading libm.so.6
> Reading libdl.so.2
> Reading libpthread.so.0
> Reading libc.so.6
> (dbx) run -version
> Running: gamma -version 
> (process id 5777)
> Reading librt.so.1
> Reading libhpi.so
> Reading libnsl.so.1
> Reading libnss_files.so.2
> Reading libverify.so
> Reading libjava.so
> Reading libzip.so
> ....
>
> Then I have to kill this process to stop it.
> Do you know how to resolve this problem and start dbx properly？
> Thanks.
>
>
> xiaobin.lu wrote:
>   
>> Refer to 
>> http://developers.sun.com/sunstudio/overview/topics/debug_index.html to 
>> find more details on how to use Sun Studio which is available on Linux 
>> to debug mixed Java and native code.
>>
>> -Xiaobin
>>
>> Colin(Du Li) wrote:
>>     
>>> Hi, guys.
>>>
>>> Now I'm debugging Hotspot. I'm using GDB. When I debug the source codes
>>> written in  c++, it's fine. But if the VM has launched, I cannot trace
>>> into
>>> the source codes written in java. e.g. When I find Hotspot cannot load
>>> some
>>> class, and I wanna step into the class java.lang.ClassLoader ,  I don't
>>> know
>>> how to trace it. Apparently, I cannot do that with GDB. 
>>> Can you guys give me some suggestion for debug in this situation?
>>> I spend several days on this problem, and really need  some help on the
>>> debug things.
>>>
>>> Thanks a lot in advance!!
>>>
>>>
>>>
>>>   
>>>       
>>
>>     
>
>   

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