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.
   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 only a specific
  19 subset of 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 cannot only communicate with
  26 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 [this release announcement](//lttng.org/blog/2015/02/27/lttng-2.6-released/).