contents/whats-new.md

   1 ---
   2 id: whats-new
   3 ---
   4
   5 Most of the changes of LTTng 2.6 are bug fixes, making the toolchain
   6 more stable than ever before. Still, LTTng 2.6 adds some interesting
   7 features to the project.
   8
   9 LTTng 2.5 already supported the instrumentation and tracing of
  10 [Java applications](#doc-java-application) through `java.util.logging`
  11 (JUL). LTTng 2.6 goes one step further by supporting
  12 <a href="https://logging.apache.org/log4j/1.2/" class="ext">Apache log4j 1.2</a>.
  13 The new log4j domain is selected using the `--log4j` option in various
  14 commands of the `lttng` tool.
  15
  16 LTTng-modules has supported system call tracing for a long time,
  17 but until now, it was only possible to record either all of them,
  18 or none of them. LTTng 2.6 allows the user to record specific
  19 system call events, e.g.:
  20
  21 <pre class="term">
  22 lttng enable-event --kernel --syscall open,fork,chdir,pipe
  23 </pre>
  24
  25 Finally, the `lttng` command line tool is not only able to communicate
  26 with humans as it used to do, but also with machines thanks to its new
  27 [machine interface](#doc-mi) feature.
  28
  29 To learn more about the new features of LTTng 2.6, see
  30 [the release announcement](//lttng.org/blog/2015/02/27/lttng-2.6-released/).