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  1. ,
    Expert tip

    The server rejects all jars that already belong to the server runtime (such as tomcat-**.jar, servlet**.jar). Consider substituting the CORS filter you're using for this one:

  2. ,

    This is thrown when the Java Virtual Machine (JVM) tries to load a particular class and the specified class cannot be found in the classpath. If you are using a Java version less than 8, upgrade because java.util.Base64 only comes with > Java 8.

Solutions on the web

via by Unknown author, 2 years ago not found in gnu.gcj.runtime.SystemClassLoader{urls=[file:cmbc-SQL.jar], parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}}
via Oracle Community by 843785, 3 months ago
javax/microedition/midlet/MIDlet not found in java.lang.ClassLoader$1{urls=[file:/My Documents/Personal/InfoShare.jar], parent=null}
via Google Groups by, 11 months ago
javax/bluetooth/LocalDevice not found in java.lang.ClassLoader$1{urls=[file:/My Documents/InventarioJSE.jar], parent=null}
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