[lttng-dev] Problem in finding Jar file of LTTng for adding to Java project

Mon Oct 16 15:44:17 UTC 2017

On Mon, Oct 16, 2017 at 8:13 AM, Alexandre Montplaisir
<alexmonthy at voxpopuli.im> wrote:
>
>
>
> On 2017-10-14 06:18 PM, MMM wrote:
> >  I installed LTTng from source at first. While after that, I also reinstall it from PPA. Is it the cause of my problem?
>
> Perhaps! Having a second installation in parallel is a common source of
> errors, because a binary from a given version may try to link with a
> library from another one.

I doubt that, because Automake sets explicit rpaths when installing.

The default install prefix for the PPA packages is /usr while the
default install prefix (unless you set it explicitly with --prefix at
configuration time) when you build from source is /usr/local. Unless
you're messing with LD_LIBRARY_PATH which takes precedence over the
binary's rpath, there's no conflict.

Phil

>
> Make sure you don't have any LTTng-related binaries or libraries in
> /usr/local/bin, /usr/local/lib, /usr/local/share/java, etc.
> You can also check the output of "ldd /usr/bin/lttng" and make sure only
> libraries from /usr/lib are listed, and not /usr/local/lib.
>
> Cheers,
> Alex
>
> >    On Friday, October 13, 2017, 11:57:33 PM GMT+3:30, Alexandre Montplaisir <alexmonthy at voxpopuli.im> wrote:
> >
> >  On 2017-10-12 03:38 PM, MMM wrote:
> >> Dear Alex,
> >>
> >> As I mentioned, I used sample examples. for instance, I used mentioned
> >> simple program that you told tracing it return some result. While, I
> >> can not receive any result from tracing it. Also, I use Ubuntu 16.04
> >> LTS and lttng 2.9.5. Besides, the output of asked command is
> >>
> >> //////////////////
> >> -rw-r--r-- 1 root root 40871 Jun 16 13:56
> >> /usr/share/java/lttng-ust-agent-common-2.9.1.jar
> >> lrwxrwxrwx 1 root root    32 Jun 16 13:56
> >> /usr/share/java/lttng-ust-agent-common.jar ->
> >> lttng-ust-agent-common-2.9.1.jar
> >> -rw-r--r-- 1 root root  4369 Jun 16 13:56
> >> /usr/share/java/lttng-ust-agent-jul-2.9.1.jar
> >> lrwxrwxrwx 1 root root    29 Jun 16 13:56
> >> /usr/share/java/lttng-ust-agent-jul.jar -> lttng-ust-agent-jul-2.9.1.jar
> >> -rw-r--r-- 1 root root  3933 Jun 16 13:56
> >> /usr/share/java/lttng-ust-agent-log4j-2.9.1.jar
> >> lrwxrwxrwx 1 root root    31 Jun 16 13:56
> >> /usr/share/java/lttng-ust-agent-log4j.jar ->
> >> lttng-ust-agent-log4j-2.9.1.jar
> >> ////////////////////////////
> > Everything seems to be in order here.
> >
> > I will try your exact same environment to see if I can reproduce the issue.
> > How did you install your LTTng 2.9? Was it from source, or from a PPA?
> > The Ubuntu 16.04 main archive only has 2.7.*
> >
> > Cheers,
> > Alex
> >
> >> Thanks for your attention.
> >> Regards,
> >> Mehdi.
> >>
> >> On Thursday, October 12, 2017, 6:51:12 PM GMT+3:30, Alexandre
> >> Montplaisir <alexmonthy at voxpopuli.im> wrote:
> >>
> >>
> >>
> >>
> >> On 2017-10-11 06:05 PM, MMM wrote:
> >>> Dear Alex,
> >>>
> >>> Thanks for your attention. I executed your commands step by step.
> >>> While, again I received previous errors which are
> >>>
> >>> [error] Cannot open any trace for reading.
> >>> [error] opening trace "[path]/lttng-traces/auto-20171011-145947" for
> >>> reading.
> >>> [error] none of the specified trace paths could be opened.
> >>>
> >>> I do not know the reason of this problem. Could you please help me to
> >>> resolve it?
> >> As Philippe mentioned previously, this means the trace is empty, so no
> >> events were produced by the session.
> >>
> >> Did any of the other commands (java, javac, lttng create,...) output any
> >> error messages?
> >>
> >>
> >> Finally, it would help if you could specify:
> >> - What version of Ubuntu you are running
> >>
> >> - What version of LTTng you are running ("lttng --version")
> >>
> >> - The output of the following command:
> >> $ ls -l /usr/share/java/lttng-ust*
> >>
> >> Thanks,
> >> Alex
> >>
> >>> Regards,
> >>> Mehdi.
> >>>
> >>>
> >>>
> >>>
> >>> On Wednesday, October 11, 2017, 6:09:41 PM GMT+3:30, Alexandre
> >>> Montplaisir <alexmonthy at voxpopuli.im
> >> <mailto:alexmonthy at voxpopuli.im>> wrote:
> >>>
> >>> Hi,
> >>>
> >>> I tried compiling and running your program, and it runs fine on my end.
> >>> Here is what I did:
> >>>
> >>> saved the snippet below to "Hello.java"
> >>> $ apt install liblttng-ust-agent-java
> >>> $ javac -cp /usr/share/java/lttng-ust-agent-jul.jar Hello.java
> >>>
> >>> $ lttng create
> >>> $ lttng enable-event -a -j
> >>> $ lttng start
> >>> $ java -cp /usr/share/java/lttng-ust-agent-jul.jar:. Hello
> >>> $ lttng stop
> >>> $ lttng view
> >>>
> >>> and I get the following output:
> >>> Trace directory: /home/alexandre/lttng-traces/auto-20171011-102431
> >>>
> >>> [10:24:49.326824061] (+?.?????????) calista lttng_jul:event: { cpu_id =
> >>> 2 }, { msg = "Hello World, the answer is 42", logger_name = "hello",
> >>> class_name = "Hello", method_name = "main", long_millis = 1507731889299,
> >>> int_loglevel = 800, int_threadid = 1 }
> >>>
> >>>
> >>> Make sure you are setting the -classpath/-cp option correctly, this
> >>> could explain the "unknown package" error you were getting.
> >>>
> >>> Also note that you are using the deprecated "LTTngAgent.getLTTngAgent()"
> >>> API (the "javac" command should warn about it). It should still work,
> >>> but it's highly recommended to use the new API, as described in
> >>> https://lttng.org/docs/v2.10/#doc-jul
> >>> <https://lttng.org/docs/v2.10/#doc-jul%20>. Basically you have to
> >>> instantiate an "LttngLogHandler", and attach it to your Logger.
> >>>
> >>> HTH,
> >>> Alex
> >>>
> >>>
> >>> On 2017-10-10 04:12 PM, MMM via lttng-dev wrote:
> >>>> Dear Philippe,
> >>>>
> >>>> Thanks a lot for your consideration. I solved former problem. While, I
> >>>> faced with a new problem. Indeed, when I create a LTTng session, start
> >>>> it and finally stop LTTng, I could not find trace files in mentioned
> >>>> folder. My java code is
> >>>>
> >>>> ///////////////////////////////////////
> >>>> import java.io.IOException;
> >>>> import java.util.logging.Handler;
> >>>> import java.util.logging.Logger;
> >>>>
> >>>> import org.lttng.ust.agent.LTTngAgent;
> >>>> import org.lttng.ust.agent.jul.LttngLogHandler;
> >>>>
> >>>> public class Hello {
> >>>> private static final int answer = 42;
> >>>> private static LTTngAgent lttngAgent;
> >>>>
> >>>> public static void main(String[] args) throws InterruptedException {
> >>>> Logger helloLog = Logger.getLogger("hello");
> >>>> lttngAgent = LTTngAgent.getLTTngAgent();
> >>>>
> >>>> Thread.sleep(5000);
> >>>> helloLog.info("Hello World, the answer is " + answer);
> >>>> lttngAgent.dispose();
> >>>> }
> >>>>
> >>>> }
> >>>> ///////////////////////
> >>>>
> >>>> Also, I used following LTTng commands.
> >>>>
> >>>> ////////////////////////////////
> >>>> lttng create java-test
> >>>> lttng enable-event -a -l
> >>>> lttng start
> >>>> ///Start My java Application///
> >>>> lttng stop
> >>>> ////////////////////////////
> >>>>
> >>>> Besides, when I used "lttng view" after stopping LTTng, I received
> >>>> following error message
> >>>>
> >>>> [error] Cannot open any trace for reading.
> >>>> [error] opening trace
> >>>> "/[path]/lttng-traces/java-test10-20171010-130909" for reading.
> >>>> [error] none of the specified trace paths could be opened.
> >>>>
> >>>> Could you please help me to resolve it.
> >>>>
> >>>> Regards,
> >>>> Mehdi.
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> On Monday, October 9, 2017, 1:05:59 AM GMT+3:30, Philippe Proulx
> >>>> <eeppeliteloop at gmail.com <mailto:eeppeliteloop at gmail.com>
> >> <mailto:eeppeliteloop at gmail.com <mailto:eeppeliteloop at gmail.com>>> wrote:
> >>>>
> >>>> On Sun, Oct 8, 2017 at 4:15 PM, MMM via lttng-dev
> >>>> <lttng-dev at lists.lttng.org <mailto:lttng-dev at lists.lttng.org>
> >> <mailto:lttng-dev at lists.lttng.org <mailto:lttng-dev at lists.lttng.org>>
> >>> <mailto:lttng-dev at lists.lttng.org <mailto:lttng-dev at lists.lttng.org>
> >> <mailto:lttng-dev at lists.lttng.org <mailto:lttng-dev at lists.lttng.org>>>>
> >>> wrote:
> >>>>> Dear Users,
> >>>>>
> >>>>> I am beginner in tracing using LTTng. At present, I am going to
> >>>> trace a java
> >>>>> program in  Ubuntu, while I faced with a problem. When I install
> >>>> LTTng on
> >>>>> Ubuntu, I also install
> >>>>>
> >>>>> "liblttng-ust-agent-java" by "apt-get install
> >> liblttng-ust-agent-java"
> >>>>> command in Ubuntu. But, when I want to import any libraries related
> >>>> to LTTng
> >>>>> such as
> >>>> "org.lttng.ust.agent.jul.LttngLogHandlerorg.lttng.ust.LTTngAgent" to
> >>>>> my program, it is marked as unknown package. Indeed, I could not
> >>>> find LTTng
> >>>>> Jar file for adding it to my program libraries. Furthermore, I
> >>>> searched in
> >>>>> all files and folders, while I could not find Jar file. Could you
> >>> please
> >>>>> help me to understand the cause of this problem and solve it.
> >>>> I'm not a Ubuntu specialist, but from
> >>>>
> >> <https://packages.ubuntu.com/zesty/all/liblttng-ust-agent-java/filelist>,
> >>>> I would say:
> >>>>
> >>>> * /usr/share/java/lttng-ust-agent-jul.jar
> >>>> * /usr/share/java/lttng-ust-agent-log4j.jar
> >>>>
> >>>> On 16.04, it's:
> >>>>
> >>>> * /usr/share/java/liblttng-ust-agent.jar
> >>>>
> >>>> Add the required JAR file to your classpath.
> >>>>
> >>>> Have a look at <http://lttng.org/docs/v2.9/#doc-java-application>.
> >>>>
> >>>> Phil
> >>>>
> >>>>
> >>>>>
> >>>>> Best regards,
> >>>>>
> >>>>> Mehdi.
> >>>>>
> >>>>>
> >>>>> _______________________________________________
> >>>>> lttng-dev mailing list
> >>>>> lttng-dev at lists.lttng.org <mailto:lttng-dev at lists.lttng.org>
> >> <mailto:lttng-dev at lists.lttng.org <mailto:lttng-dev at lists.lttng.org>>
> >>> <mailto:lttng-dev at lists.lttng.org <mailto:lttng-dev at lists.lttng.org>
> >> <mailto:lttng-dev at lists.lttng.org <mailto:lttng-dev at lists.lttng.org>>>
> >>>>> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> >>>>
> >>>> _______________________________________________
> >>>> lttng-dev mailing list
> >>>> lttng-dev at lists.lttng.org <mailto:lttng-dev at lists.lttng.org>
> >> <mailto:lttng-dev at lists.lttng.org <mailto:lttng-dev at lists.lttng.org>>
> >>>> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> >
>
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