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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: https://goo.gl/ctQ7Fs

  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 Stack Overflow by Adrian Salinero
, 1 month ago
java.lang.ClassNotFoundException: countdown2.test2 cannot be found by org.eclipse.scada.vi.ui.draw2d_0.3.0.v20160226-1536
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