> On 30 mars 2016, at 09:40, Bacchu, Anjan <[email protected]> wrote:
>
> Hi Staffan,
>
> I just now saw the presentation slides at
> http://www.slideshare.net/stalar/diagnosing-your-application-on-the-jvm
> <http://www.slideshare.net/stalar/diagnosing-your-application-on-the-jvm>.
>
> On Slide 16 of the presentation, you show the details of the “HotSpot Dynamic
> Attach Mechanism” for Windows.
>
> 1) You talk about Remote process injecting code into the JVM using
> combination of VirtualAllocEx and
> 2) WriteProcessMemory. Further it goes ahead and creates a Remote thread in
> the JVM to call above code.
>
>
> Do you have some sample code which does this, to say, dump the heap ?
If you want to dump the heap, take a look at “jcmd <pid> GC.heap_dump”:
----------
Generate a HPROF format dump of the Java heap.
Impact: High: Depends on Java heap size and content. Request a full GC unless
the '-all' option is specified.
Permission: java.lang.management.ManagementPermission(monitor)
Syntax : GC.heap_dump [options] <filename>
Arguments:
filename : Name of the dump file (STRING, no default value)
Options: (options must be specified using the <key> or <key>=<value> syntax)
-all : [optional] Dump all objects, including unreachable objects
(BOOLEAN, false)
----------
You can also use “jmap -dump <pid>.
>
> I used to develop windows application long ago and just from the slide #16
> andhttp://openjdk.java.net/groups/hotspot/docs/Serviceability.html#battach
> <http://openjdk.java.net/groups/hotspot/docs/Serviceability.html#battach>,
> I’m unable to proceed further.
The source code is in the VirtualMachineImpl.c file for windows:
http://hg.openjdk.java.net/jdk9/jdk9/jdk/file/1565a0efe6f0/src/jdk.attach/windows/native/libattach/VirtualMachineImpl.c
<http://hg.openjdk.java.net/jdk9/jdk9/jdk/file/1565a0efe6f0/src/jdk.attach/windows/native/libattach/VirtualMachineImpl.c>
>
> All help will be useful.
>
> Thank you very much,
>
> BR,
> ~A
