java.lang.NoClassDefFoundError: com/google/appengine/tools/development/DevSocketImplFactory

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you can change your scala version to 2.11.11

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Expert tip

A few things cause this exception:
1) Check if you have all jars and if they're in the correct path.
2) Your classpath might be broken, you can define it in the command line with java -cp yourClassPath or at your IDE if you're using one.

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via GitHub by briandealwis
, 1 year ago
com/google/appengine/tools/development/DevSocketImplFactory
java.lang.NoClassDefFoundError: com/google/appengine/tools/development/DevSocketImplFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at com.google.appengine.api.socket.dev.DevSocketFilter.init(DevSocketFilter.java:48)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:662)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)
at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:271)
at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:284)
at com.google.appengine.tools.development.AutomaticInstanceHolder.startUp(AutomaticInstanceHolder.java:26)
at com.google.appengine.tools.development.AbstractModule.startup(AbstractModule.java:87)
at com.google.appengine.tools.development.devappserver2.DevAppServer2Impl.doStart(DevAppServer2Impl.java:242)
at com.google.appengine.tools.development.devappserver2.DevAppServer2Impl.access$000(DevAppServer2Impl.java:56)
at com.google.appengine.tools.development.devappserver2.DevAppServer2Impl$1.run(DevAppServer2Impl.java:208)
at com.google.appengine.tools.development.devappserver2.DevAppServer2Impl$1.run(DevAppServer2Impl.java:206)
at com.google.appengine.tools.development.devappserver2.DevAppServer2Impl.start(DevAppServer2Impl.java:206)
at com.google.appengine.tools.development.devappserver2.StandaloneInstance$StartAction.apply(StandaloneInstance.java:128)
at com.google.appengine.tools.development.devappserver2.StandaloneInstance$StartAction.apply(StandaloneInstance.java:82)
at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)
at com.google.appengine.tools.development.devappserver2.StandaloneInstance.run(StandaloneInstance.java:66)
at com.google.appengine.tools.development.devappserver2.StandaloneInstance.main(StandaloneInstance.java:44)

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