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Do you export the bin folder of your package in the manifest.xml?

Please have a look at this file as an example: https://github.com/knowrob/knowrob/blob/master/mod_vis/manifest.xml#L25

Do you export the bin folder of your package in the manifest.xml?

Please have a look at this file as an example: https://github.com/knowrob/knowrob/blob/master/mod_vis/manifest.xml#L25

EDIT: The problem seems to be the launch file you are using that starts the json_prolog executable directly. Once this node has been started, the JVM is initialized and modifications of the CLASSPATH variable do not have any effect any more. There is a special script in the rosprolog package called run_with_prolog_env that exports the CLASSPATH before launching json_prolog. You can have a look at an example in the launch file of the ias_semantic_map package.