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From Wolfgang Huse <>
Subject Re: Missing Drivers in fat JAR
Date Thu, 14 May 2020 13:58:44 GMT
Thanks a lot Chris...

There was the Service transformer missing. I only had used the ManifestResourceTransformer
(which is included in the pom.xml in the examples-folder). The Service transformer is inherited
from the project root pom.xml

Works now as expected....

Mit freundlichen Grüßen – With kind regards
Wolfgang Huse

On 5/14/20, 2:11 PM, "Christofer Dutz" <> wrote:

    Hi Wolfgang,

    if you are speaking about a project of yours where you are using the shade plugin, then
you need to add a transformer to your plugin configuration.
    Every driver has a META-INF/services/ file, which lists
that particular driver.
    If you run the shade plugin without any transformer only one of these are packaged in
the jar the others are omitted. 
    That's why you have only one driver availale.

    In order to fix this please update your plugin configuration like we did in the examples:

                    <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                    <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                      These files contain signatures for classes, omit them as in
                      shaded archives this has cause quite some problems in the past.

    Hope that helps.


                  <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>

    Am 14.05.20, 10:31 schrieb "Wolfgang Huse" <>:

        i am builing a fat jar with maven shade plugin but if I run the application an error

        17:32.651 [main] INFO - Instantiating new PLC
Driver Manager with class loader jdk.internal.loader.ClassLoaders$AppClassLoader@55054057
        10:17:32.653 [main] INFO - Registering available
        10:17:32.658 [main] INFO - Registering driver
for Protocol modbus (Modbus)
        Exception in thread "main"
Unable to find driver for protocol 'opcua'

        Any hint how to include the needed classes for the drivers ?

        Mit freundlichen Grüßen – With kind regards

        Wolfgang Huse

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