TabJolt is available as-is and not supported by Tableau. However, we expect you'll have questions.
Please post your questions on the Tableau Server Administration forum with "TabJolt" as the subject.
We're hopeful that many of you will start to build a community around this tool and share what you learn
Lénaïc RIÉDINGER, Global Community Engineer Tableau
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So I could solve the issue, I described.
The problem was that JMeter added a bunch of xml tags to the .jmx file.
Is there a way to force JMeter to not add those additional tags? The only workaround I found is to compare a standard TabJolt .jmx with my newly created one and then removing everything, that JMeter added to my xml.