projects / lttng-ust.git / blame
| Commit | Line | Data |
|---|---|---|
| 6490eba0 MD |
1 | The support for JUL needs to be explicitly enabled when lttng-ust is |
| 2 | configured, e.g.: | |
| 43e5396b DG |
3 | |
| 4 | dependency: openjdk-7-jdk | |
| 5 | ./configure --with-java-jdk=/usr/lib/jvm/java-7-openjdk --with-jni-interface | |
| 6 | ||
| 7 | On Debian system for instance you can simply use the "default-java" path: | |
| 8 | ||
| 9 | ./configure --with-java-jdk=/usr/lib/jvm/default-java --with-jni-interface | |
| 10 | ||
| 11 | Note that the OpenJDK 7 is used for development and continuous integration thus | |
| 12 | we directly support that version for this library. However, it has been tested | |
| 13 | with OpenJDK 6 also. Please let us know if other Java version (commercial or | |
| 14 | not) work with this library. | |
| 15 | ||
| 6490eba0 MD |
16 | The LTTng Java Agent for JUL support is typically installed here: |
| 17 | ||
| 18 | /usr/local/lib/lttng/java/liblttng-ust-jul.jar | |
| 19 | ||
| 43e5396b DG |
20 | After building, you can use the "liblttng-ust-jul.jar" file in a Java project. |
| 21 | It requires "liblttng-ust-jul.so" which is installed by the build system when | |
| 22 | doing "make install". Make sure that your Java application can find this shared | |
| 23 | object with the "java.library.path". | |
| 24 | ||
| 25 | In order to enable the agent in your Java application, you simply have to add | |
| 26 | this as early as you can in the runtime process. | |
| 27 | ||
| 28 | import org.lttng.ust.jul.LTTngAgent; | |
| 29 | [...] | |
| 30 | private static LTTngAgent lttngAgent; | |
| 31 | [...] | |
| 32 | lttngAgent = LTTngAgent.getLTTngAgent(); | |
| 33 | ||
| 6490eba0 MD |
34 | This will initialize automatically the singleton LTTngAgent, and will |
| 35 | return when session daemon registration is done. If no session daemon is | |
| 36 | available, the execution will continue and the agent will retry every | |
| 37 | 3 seconds. | |
| 43e5396b DG |
38 | |
| 39 | Once registered, it is adds a thread inside your Java application and will be | |
| 40 | able to automatically use every Logger object and map them to the jul_event | |
| 6490eba0 | 41 | tracepoint of the JNI interface. |