Erocci java-dbus integration

Prerequisite

• JDK
• Maven
• java D-Bus implementation. It can be installed with:

$ make deps

See "troubleshooting" part below in case of error.

Quickstart

$ make run

Project format

src/main/dbus/ contains the XML file describing the erocci DBus interface.

pom.xml imports the maven-dbus-plugin (to generate a java interface) and specifies dependencies (to compile).

Note: the maven-dbus-plugin version is the one available online at maven central (0.1). To compile locally your own version from sources, set version to 0.2-SNAPSHOT in pom.xml.

Code generation

$ mvn clean install

The java interface is generated in src/generated/java, then compiled in target/classes .

Launch as standalone service (outside Eclipse/IDE)

$ mvn exec:java -Dexec.mainClass="org.ow2.erocci.backend.BackendDBusService"

The dbus service is called "org.ow2.erocci.backend".

See "troubleshooting" part below in case of error.

Interface with erocci

An erocci-dbus-java.config file is provided (in the project's home directory). Launch erocci with this file used as configuration; for example, in the erocci directory:

./start.sh -c ../erocci-dbus-java/erocci-dbus-java.config

Troubleshooting

• "no unix-java in java.library.path" Generally occurs when you do not use your system's default JDK. To fix it: Copy libunix-java.so in your JDK's jre/lib/ directory, eg. sudo cp /usr/lib/jni/libunix-java.so /usr/lib/jvm/jdk1.8.0_45/jre/lib/amd64/

• "Failed to connect to bus unknown address type kernel"

Check the DBUS_SESSION_BUS_ADDRESS environment variable. It is a list of one or more items (separated by semicolons). The 1st item should start with "unix:". If its starts with "kernel:", remove the 1st item from the list. Example:

$ printenv DBUS_SESSION_BUS_ADDRESS
kernel:path=/sys/fs/kdbus/1000-user/bus;unix:path=/run/user/1000/bus
$ export DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus

(can also be done using a sed command:

DBUS_SESSION_BUS_ADDRESS=$(printenv DBUS_SESSION_BUS_ADDRESS | sed -e 's/kernel:.*;//' ).