render(String) 报错

[Mvpanswer7]

在controller里使用render(字符串)时，一直报这个错，不知道是哪里用错了
java.lang.AbstractMethodError: net.csdn.modules.http.DefaultResponse.originContent(Ljava/lang/String;)Lnet/csdn/modules/http/RestResponse;
at net.csdn.modules.http.ApplicationController.render(ApplicationController.java:121) at streaming.rest.RestController.deleteParam(RestController.scala:111) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at net.csdn.modules.http.RestController.filter(RestController.java:139) at net.csdn.modules.http.RestController.dispatchRequest(RestController.java:99) at net.csdn.modules.http.HttpServer$DefaultHandler.handle(HttpServer.java:184) at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) at org.eclipse.jetty.server.Server.handle(Server.java:499) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257) at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555) at java.lang.Thread.run(Thread.java:745)
[2017-11-22 10:25:40,309][ERROR][modules.http ] System processing error java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at net.csdn.modules.http.RestController.filter(RestController.java:139) at net.csdn.modules.http.RestController.dispatchRequest(RestController.java:99) at net.csdn.modules.http.HttpServer$DefaultHandler.handle(HttpServer.java:184) at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) at org.eclipse.jetty.server.Server.handle(Server.java:499) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257) at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555) at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.AbstractMethodError: net.csdn.modules.http.DefaultResponse.originContent(Ljava/lang/String;)Lnet/csdn/modules/http/RestResponse;
at net.csdn.modules.http.ApplicationController.render(ApplicationController.java:121) at streaming.rest.RestController.deleteParam(RestController.scala:111) ... 16 more [2017-11-22 10:25:40,311][INFO ][modules.http.processor.impl] Completed 500 in 91ms POST /admin/params/delete

[2017-11-22 10:25:40,311][WARN ][org.eclipse.jetty.server.HttpChannel] /admin/params/delete java.lang.NullPointerException
at java.io.PrintWriter.write(PrintWriter.java:473) at net.csdn.modules.http.DefaultResponse.output(DefaultResponse.java:196) at net.csdn.modules.http.DefaultResponse.error(DefaultResponse.java:190) at net.csdn.modules.http.HttpServer$DefaultHandler.defaultErrorAction(HttpServer.java:159) at net.csdn.modules.http.HttpServer$DefaultHandler.handle(HttpServer.java:196) at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) at org.eclipse.jetty.server.Server.handle(Server.java:499) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257) at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555) at java.lang.Thread.run(Thread.java:745)