I've noticed that when using CXF as a Maven dependency and aggregating it into an uber-Jar using the Maven Shade plugin there is an issue in that by default, the META-INF/cxf/bus-extensions.txt file (and other necessary CXF resources) aren't aggregated properly and loaded properly. They are kept in separate files. For examples of this, see:

  1. TIKA-1712
  2. CXF-6545

The fix is to use the Maven Shade Plugin's AppendingTransformer to combine all the copies of the bus-extensions.txt file present in the jars. See these examples here:

https://fisheye6.atlassian.com/browse/cxf/osgi/bundle/all/pom.xml?r=12acd46e3dbe98fa1321374b09174d5876271f08#to448

https://maven.apache.org/plugins/maven-shade-plugin/examples/resource-transformers.html#AppendingTransformer

You can handle it with the plugin configuration for the Shade plugin e.g., like this:

Shade Plugin Example
<plugin>
<artifactId>maven-shade-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>

<configuration>
<createDependencyReducedPom>false</createDependencyReducedPom>
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*</exclude>
<exclude>LICENSE.txt</exclude>
<exclude>NOTICE.txt</exclude>
<exclude>CHANGES</exclude>
<exclude>README</exclude>
<exclude>builddef.lst</exclude>
<!--  clutter not needed in jar  -->
<exclude>resources/grib1/nasa/README*.pdf</exclude>
<exclude>resources/grib1/**/readme*.txt</exclude>
<exclude>resources/grib2/**/readme*.txt</exclude>
<!--
 TIKA-763: Workaround to avoid including LGPL classes 
-->
<exclude>ucar/nc2/iosp/fysat/Fysat*.class</exclude>
<exclude>ucar/nc2/dataset/transform/VOceanSG1*class</exclude>
<exclude>ucar/unidata/geoloc/vertical/OceanSG*.class</exclude>
</excludes>
</filter>
</filters>


<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.apache.tika.cli.TikaCLI</mainClass>
</transformer>

<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
<transformer implementation="org.apache.maven.plugins.shade.resource.IncludeResourceTransformer">
<resource>META-INF/LICENSE</resource>
<file>target/classes/META-INF/LICENSE</file>
</transformer>

<transformer implementation="org.apache.maven.plugins.shade.resource.IncludeResourceTransformer">
<resource>META-INF/NOTICE</resource>
<file>target/classes/META-INF/NOTICE</file>

</transformer>


<transformer implementation="org.apache.maven.plugins.shade.resource.IncludeResourceTransformer">
<resource>META-INF/DEPENDENCIES</resource>
<file>target/classes/META-INF/DEPENDENCIES</file>

</transformer>

<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/cxf/bus-extensions.txt</resource>

</transformer>
</transformers>

</configuration>
</execution>

</executions>

</plugin>