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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 GitHub by slugdude
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Cannot find main class `protocolsupport.ProtocolSupport'
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Cannot find main class `TestPlugin'
via gutefrage.net by Unknown author, 2 years ago
java.lang.ClassNotFoundException: protocolsupport.ProtocolSupport	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101)	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86)	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:278)	at org.bukkit.plugin.java.PluginClassLoader.(PluginClassLoader.java:64)	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131)	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329)	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251)	at org.bukkit.craftbukkit.v1_10_R1.CraftServer.loadPlugins(CraftServer.java:297)	at net.minecraft.server.v1_10_R1.DedicatedServer.init(DedicatedServer.java:203)	at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:535)	at java.lang.Thread.run(Thread.java:745)