How to specity the -agentlib option in a jtreg test?

[Staffan Larsen]

The JVMTI spec is kind of vague on this point, but does not mention system properties.

-agentlib:<agent-lib-name>=<options>
The name following -agentlib: is the name of the library to load. Lookup of the library, both its full name and location, proceeds in a platform-specific manner. Typically, the <agent-lib-name> is expanded to an operating system specific file name. The <options> will be passed to the agent on start-up. For example, if the option -agentlib:foo=opt1,opt2 is specified, the VM will attempt to load the shared library foo.dllfrom the system PATH under WindowsTM or libfoo.so from the LD_LIBRARY_PATH under the SolarisTM operating environment. If the agent library is statically linked into the executable then no actual loading takes place.

http://docs.oracle.com/javase/8/docs/platform/jvmti/jvmti.html <http://docs.oracle.com/javase/8/docs/platform/jvmti/jvmti.html>



> On 18 apr. 2016, at 19:51, Jonathan Gibbons <jonathan.gibbons at oracle.com> wrote:
> 
> OK, thanks for clarifying.
> 
> The question is, should -agentlib use the system property (that is already being set) or should jtreg set LD_LIBRARY_PATH (which is platform specific.)
> 
> -- Jon
> 
> On 04/18/2016 04:53 AM, Alexander Kulyakhtin wrote:
>> Jon,
>> 
>> In the 'rerun' section I have:
>> 
>> images/jdk/bin/java \\
>> ...
>> -Dtest.nativepath=<...>images/test/hotspot/jtreg/native
>> -Djava.library.path=<...>images/test/hotspot/jtreg/native
>> -agentlib:TestGetModules
>> ...
>> 
>> While TestGetModules.so does reside in the images/test/hotspot/jtreg/native, jtreg does not set LD_LIBRARY_PATH to that directory before invoking java.
>> Therefore -agentlib does not know where to look for the library.
>> The System.loadLibrary, on the contrary, does succeed because of the -Djava.library.path passed to java.
>> 
>> Best regards,
>> Alexander
>> 
>> ----- Original Message -----
>> From: jonathan.gibbons at oracle.com
>> To: jtreg-use at openjdk.java.net
>> Sent: Friday, April 15, 2016 7:05:18 PM GMT +03:00 Iraq
>> Subject: Re: How to specity the -agentlib option in a jtreg test?
>> 
>> jtreg should report the command it is trying to execute in the "rerun"
>> section.
>> 
>> If you execute that command directly, does it work?   In other words,
>> can you isolate the problem to jtreg or to the execution of the command
>> that jtreg execs?
>> 
>> -- Jon
>> 
>> On 04/15/2016 07:53 AM, Staffan Larsen wrote:
>>> I don’t know why it does not work for -agentlib, but as a workaround you can create an @driver class that launches your test program with the -agentpath parameter and get the location of the native libraries through the system property test.nativepath.
>>> 
>>> Staffan
>>> 
>>>> On 15 apr. 2016, at 16:29, Alexander Kulyakhtin <alexander.kulyakhtin at oracle.com> wrote:
>>>> 
>>>> Hi,
>>>> 
>>>> I'm trying to create a jtreg test which compiles and then executes a java class with the -agentlib option (to test some JVMTI functionality)
>>>> 
>>>> In my test I have
>>>> 
>>>> @compile MyTest.java
>>>> @run main/othervm -agentlib:mylib MyTest
>>>> 
>>>> I run the test with:
>>>> 
>>>> jtreg -nativepath:<path to libmylib.so> MyTest
>>>> 
>>>> However, it fails with:
>>>> 
>>>> "Could not find agent library mylib on the library path, libmylib.so: cannot open shared object file: No such file or directory"
>>>> 
>>>> The -nativepath does provide for the successful loading of the library when I use System.loadLibrary("mylib").
>>>> However, for the -agentlib option, it does not help.
>>>> 
>>>> Does someone know if it is possible to specify the library path for the -agentlib option, from within a jtreg test or using the jtreg options?
>>>> 
>>>> Thank you very much for your help.
>>>> 
>>>> Best regards,
>>>> Alexander
>>>> 
> 

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