Hi,

I have extracted a small project to demonstrate the behaviour here: https://github.com/mpoehler/endpointsAppEngineJava8Test

Just clone it and run it with gradle appengineRun and it will fail with the following Exception:

2017-08-28 16:45:23.068:WARN:oejs.ServletHandler:qtp386163331-18: Error for /_ah/api/discovery/v1/apis/klpvApi/v2/rest
java.lang.NoClassDefFoundError: com/google/appengine/repackaged/org/codehaus/jackson/node/ObjectNode
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
at java.lang.Class.getConstructor0(Class.java:3075)
at java.lang.Class.newInstance(Class.java:412)
at org.eclipse.jetty.server.handler.ContextHandler$Context.createInstance(ContextHandler.java:2481)
at org.eclipse.jetty.servlet.ServletContextHandler$Context.createServlet(ServletContextHandler.java:1327)
at org.eclipse.jetty.servlet.ServletHolder.newInstance(ServletHolder.java:1285)
at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:615)
at org.eclipse.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:499)
at org.eclipse.jetty.servlet.ServletHolder.ensureInstance(ServletHolder.java:791)
at org.eclipse.jetty.servlet.ServletHolder.prepare(ServletHolder.java:776)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:579)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
at com.google.appengine.tools.development.jetty9.DevAppEngineWebAppContext.doScope(DevAppEngineWebAppContext.java:94)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
at com.google.appengine.tools.development.jetty9.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:597)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
at org.eclipse.jetty.server.Server.handle(Server.java:534)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:283)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:108)
at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)
at java.lang.Thread.run(Thread.java:745)

The deployed version works, as you can see here: https://endpointstest-169017.appspot.com/

When you remove the <runtime>java8</runtime> entry in application-web.xml, the application works as expected locally too, but that uses an other dev-server (jetty 6 instead of 9).

It seems to me, that there is an dependency missing in the new java8 dev-server, but I have no clue what that can be.

Thanks in advance!

Marco