The project does not enforce the use of a specific IDE, but rather, a set of guidelines that can be configured in an IDE. The examples and documentation focus on IntelliJ IDEA, and include some help for Eclipse. For other IDEs, developers should consult the documentation for the IDE of choice for specific configuration steps.
To get the best development experience for ONOS, the team suggests to use IntelliJ 2018.1 with the Bazel plugin installed.
IMPORTANT: Latest 2018.2 IntelliJ version currently has no support for Bazel plugin.
The Intellij version we suggest is 2018.1 because it currently has support for the Bazel plugin, you can find and download 2018.1 version here: https://www.jetbrains.com/idea/download/previous.html
If you have no idea where to start, here are some instructions on how to install IntelliJ.
After having dowloaded and installed Intellij ONOS needs the Bazel plugin.
More information on how to install the Bazel plugin can be found here: https://ij.bazel.build/docs/bazel-plugin.html
Assuming you have obtained the source code already and Installed the Bazel plugin form the previous section, the following steps can be followed to import ONOS into IntelliJ:
More information on how to import a Bazel project can be found here: https://ij.bazel.build/docs/import-project.html
If your import fails with the error Error:Cannot run program "bazel" (in directory ): error=2, No such file or directory IntelliJ did not properly pick-up the location of the Bazel binary and we need to change it.
More information on this error can be found here: https://github.com/bazelbuild/intellij/issues/230
While the project is being processed, we can go ahead and import the recommended IDEA settings. We do this by selecting File… Import Settings… and then navigating to the ONOStools/dev directory and selecting the idea-settings.jar file. We can complete the process by pressing the OK button.
These settings have the JDK home setup for OS X (/Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home
). For Linux, select File... Project Structure... SDKs... then edit the JDK home path for 1.8 to be /usr/lib/jvm/java-8-oracle
. If IntelliJ is throwing errors such as "cannot resolve symbol string", the JDK home is likely incorrect.
If IntelliJ is throwing errors like "The package 'org.onosproject.cluster' is not exported by the bundle dependencies," go to IntelliJ IDEA->Preferences. On the sidebar, under the Editor dropdown section, select Inspections. From there, search OSGi and under the OSGi dropdown, uncheck Package accessibility inspections and press OK.
Since ONOS is licensed under Apache 2 license, we need to make sure that all source files are properly decorated with the Apache 2 license header file.
To configure IntelliJ appropriately, we will locate the header.txt file under ONOS tools/dev directory and copy its contents. Then, from IntelliJ preferences, we will select Copyright section and add a new new copyright profile. We will call this profile ONOS and paste in the previously copied header text.
Then we will make sure that the newly created ONOS copyright profile is the default and we are done.
The ONOS Screencasts page provides helpful videos on importing, debugging, and developing ONOS with IntelliJ.