本人在一个tomcat容器的JavaWeb项目中打算用netty与硬件端进行通信，写了一个netty服务如下
public class NettyServer extends HttpServlet{
private static final int port = 12888;
// java.lang.NoSuchMethodError:
public void bind() throws Exception{
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
System.out.println("start group handler");
try {
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.option(ChannelOption.SO_BACKLOG, 100)
.handler(new LoggingHandler(LogLevel.INFO))
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel socketChannel) throws Exception {
// socketChannel.pipeline().addLast(new MsgDecoder(1024*1024,4,4));
// socketChannel.pipeline().addLast(new MsgDecoder(1024*1024,4,4));
socketChannel.pipeline().addLast("readTimeOutHandler", new ReadTimeoutHandler(50));
socketChannel.pipeline().addLast(new LoginAuthRespHandler());
socketChannel.pipeline().addLast(new HeartBeatRespHandler());
socketChannel.pipeline().addLast(new NettyServerHandler());
}
});
System.out.println("start bind");
// b.bind(port).sync();
ChannelFuture f = b.bind(port).sync();
System.out.println("netty Server start listen in port " + port);
f.channel().closeFuture().sync();
}finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
@Override
public void init() throws ServletException {
try {
new NettyServer().bind();
} catch (Exception e) {
e.printStackTrace();
}
}
// @Override
// public void contextInitialized(ServletContextEvent servletContextEvent) {
// try {
// new Thread(new Runnable() {
// @Override
// public void run() {
// try {
// new NettyServer().bind();
// } catch (Exception e) {
// e.printStackTrace();
// }
// }
// }).start();
// }catch(Exception e){
// e.printStackTrace();
// }
// }
//
// @Override
// public void contextDestroyed(ServletContextEvent servletContextEvent) {
////
// }
//
public static void main(String[] args) throws Exception {
new NettyServer().bind();
}
}
使用main方法启动服务在本地测试时是没错的，但是在tomcat部署后项目启动时，试过用Listener与Servlet去控制netty服务的初始化，都在启动时报错：
java.lang.NoSuchMethodError: io.netty.bootstrap.ServerBootstrap.channel(Ljava/lang/Class;)Lio/netty/bootstrap/ServerBootstrap;
at cn.blue.netty.NettyServer.bind(NettyServer.java:39)
at cn.blue.netty.NettyServer.init(NettyServer.java:68)
at javax.servlet.GenericServlet.init(GenericServlet.java:158)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1282)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1195)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1085)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5318)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5610)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1863)
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:498)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:618)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:565)
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:498)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)
at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
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:498)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:324)
at sun.rmi.transport.Transport$1.run(Transport.java:200)
at sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Spring:4.3.7.RELEASE
Tomcat:7
JDK:1.8.0
netty:5.0.0.Alpha1
maven:3.3.9
求大神帮忙看看
