java.lang.NoClassDefFoundError: cz/tomasdvorak/eet/client/exceptions/DataSigningException

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I had to build one fat jar that will include all dependencies from the other jars that i wanted to use.

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This error means there's a class missing in your classpath during runtime. You need to create a jar with all your dependencies and have it in your classpath. Check Maven Assembly Plugin and how to add your dependencies to a jar:

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org/apache/poi/openxm l4j/exceptions/InvalidFormatException
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java.lang.ClassNotFoundException: cz.tomasdvorak.eet.client.exceptions.DataSigningException
at Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.privateGetMethodRecursive(Unknown Source)
at java.lang.Class.getMethod0(Unknown Source)
at java.lang.Class.getMethod(Unknown Source)
at sun.launcher.LauncherHelper.validateMainClass(Unknown Source)

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