Session transports not found in uber-jar

[dvogel]

I'm receiving this error:

Exception in thread "main" java.lang.ExceptionInInitializerError
    at org.freedesktop.dbus.connections.impl.DBusConnectionBuilder.validateTransportAddress(DBusConnectionBuilder.java:129)
    at org.freedesktop.dbus.connections.impl.DBusConnectionBuilder.forSessionBus(DBusConnectionBuilder.java:43)
    at org.freedesktop.dbus.connections.impl.DBusConnectionBuilder.forSessionBus(DBusConnectionBuilder.java:65)
    at dim.plantuml.PlantUmlHelper.sendViaDbus(PlantUmlHelper.java:100)
    at dim.plantuml.PlantUmlHelper.main(PlantUmlHelper.java:141)
Caused by: org.freedesktop.dbus.exceptions.TransportRegistrationException: No dbus-java-transport found in classpath, please add a transport module
    at org.freedesktop.dbus.connections.transports.TransportBuilder.getTransportProvider(TransportBuilder.java:63)
    at org.freedesktop.dbus.connections.transports.TransportBuilder.<clinit>(TransportBuilder.java:35)
    ... 5 more

I would expect the unix transport to be found and used because my environment has:

DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus

And my uber-jar contains:

unzip -l plantuml-helper.jar | grep transport
        0  2022-09-08 14:50   org/freedesktop/dbus/connections/transports/
     7690  2022-09-08 14:50   org/freedesktop/dbus/connections/transports/AbstractTransport.class
      644  2022-09-08 14:50   org/freedesktop/dbus/connections/transports/AbstractUnixTransport.class
      374  2022-09-08 14:50   org/freedesktop/dbus/connections/transports/IFileBasedBusAddress.class
     1760  2022-09-08 14:50   org/freedesktop/dbus/connections/transports/TransportBuilder$SaslAuthMode.class
    12902  2022-09-08 14:50   org/freedesktop/dbus/connections/transports/TransportBuilder.class
        0  2022-09-08 14:50   org/freedesktop/dbus/spi/transport/
     1352  2022-09-08 14:50   org/freedesktop/dbus/spi/transport/ITransportProvider.class
        0  2022-10-31 22:47   org/freedesktop/dbus/transport/
        0  2022-09-08 14:51   org/freedesktop/dbus/transport/jre/
     1775  2022-09-08 14:51   org/freedesktop/dbus/transport/jre/NativeTransportProvider.class
     1170  2022-09-08 14:51   org/freedesktop/dbus/transport/jre/NativeUnixSocketHelper.class
     3251  2022-09-08 14:51   org/freedesktop/dbus/transport/jre/NativeUnixSocketTransport.class
     1702  2022-09-08 14:51   org/freedesktop/dbus/transport/jre/UnixBusAddress.class
        0  2022-09-08 14:50   org/freedesktop/dbus/transport/tcp/
     1331  2022-09-08 14:50   org/freedesktop/dbus/transport/tcp/TcpBusAddress.class
     3102  2022-09-08 14:50   org/freedesktop/dbus/transport/tcp/TcpTransport.class
     3418  2022-09-08 14:50   org/freedesktop/dbus/transport/tcp/TcpTransportProvider.class

This is using java 17:

java -version
openjdk version "17.0.4" 2022-07-19
OpenJDK Runtime Environment (build 17.0.4+8-Debian-1)
OpenJDK 64-Bit Server VM (build 17.0.4+8-Debian-1, mixed mode, sharing)

[dvogel]

The uber-jar did indeed include the transports but the META-INF/services/org.freedesktop.dbus.spi.transport.ITransportProvider was missing. This is working for me now.

These messages mentioning the classpath could mention the ServiceLoader docs instead of or in addition to the classpath for easier debugging.

[jnsw]

The uber-jar did indeed include the transports but the META-INF/services/org.freedesktop.dbus.spi.transport.ITransportProvider was missing. This is working for me now.

where is this missing?

EDIT: isnt it this?

[hypfvieh]

The described problem here was, that creating an ueber-jar using maven shade or assembly plugin, you may have to define to include the META-INF/services/org.freedesktop.dbus.spi.transport.ITransportProvider in the ueber jar as well.

Otherwise the plugins will include the java classes, but not the service loader definition file required when using dbus-java from class path instead of module path.

[jnsw]

thank you!