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  1. ,

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

  2. ,
    Expert tip

    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)	at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)