嵌入式Jetty与Maven示例无法重新启动：地址已在使用中

时间：2016-05-24 17:15:27

标签： java netbeans jetty embedded-jetty jetty-9

尝试在NetBeans中重复运行Embedded Jetty with Maven example时，我很遗憾地收到错误：

NetBeans screenshot 

cd /Users/afarber/src/JettyMavenHelloWorld; JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home "/Applications/NetBeans/NetBeans 8.1.app/Contents/Resources/NetBeans/java/maven/bin/mvn" "-Dexec.args=-classpath %classpath org.example.HelloWorld" -Dexec.executable=/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/bin/java org.codehaus.mojo:exec-maven-plugin:1.2.1:exec
Running NetBeans Compile On Save execution. Phase execution is skipped and output directories of dependency projects (with Compile on Save turned on) will be used instead of their jar artifacts.
Scanning for projects...

------------------------------------------------------------------------
Building Jetty HelloWorld 0.1-SNAPSHOT
------------------------------------------------------------------------

--- exec-maven-plugin:1.2.1:exec (default-cli) @ hello-world ---
2016-05-24 19:01:26.748:INFO:oejs.Server:main: jetty-9.0.2.v20130417
2016-05-24 19:01:26.817:WARN:oejuc.AbstractLifeCycle:main: FAILED ServerConnector@7591083d{HTTP/1.1}{0.0.0.0:8080}: java.net.BindException: Address already in use
java.net.BindException: Address already in use
    at sun.nio.ch.Net.bind0(Native Method)
    at sun.nio.ch.Net.bind(Net.java:437)
    at sun.nio.ch.Net.bind(Net.java:429)
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
    at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:227)
    at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:69)
    at org.eclipse.jetty.server.Server.doStart(Server.java:309)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:69)
    at org.example.HelloWorld.main(HelloWorld.java:29)
2016-05-24 19:01:26.818:WARN:oejuc.AbstractLifeCycle:main: FAILED org.eclipse.jetty.server.Server@77a567e1: java.net.BindException: Address already in use
java.net.BindException: Address already in use
    at sun.nio.ch.Net.bind0(Native Method)
    at sun.nio.ch.Net.bind(Net.java:437)
    at sun.nio.ch.Net.bind(Net.java:429)
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
    at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:227)
    at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:69)
    at org.eclipse.jetty.server.Server.doStart(Server.java:309)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:69)
    at org.example.HelloWorld.main(HelloWorld.java:29)
Exception in thread "main" java.net.BindException: Address already in use
    at sun.nio.ch.Net.bind0(Native Method)
    at sun.nio.ch.Net.bind(Net.java:437)
    at sun.nio.ch.Net.bind(Net.java:429)
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
    at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:227)
    at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:69)
    at org.eclipse.jetty.server.Server.doStart(Server.java:309)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:69)
    at org.example.HelloWorld.main(HelloWorld.java:29)

如果绑定侦听套接字的根本原因是SO_REUSEADDR限制 - 那么ServerSocket.setReuseAddress(true)可能会有所帮助。

但在HelloWorld.java中如何以及在何处调用它？

package org.example;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import java.io.IOException;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;

public class HelloWorld extends AbstractHandler
{
    public void handle(String target,
                       Request baseRequest,
                       HttpServletRequest request,
                       HttpServletResponse response)
        throws IOException, ServletException
    {
        response.setContentType("text/html;charset=utf-8");
        response.setStatus(HttpServletResponse.SC_OK);
        baseRequest.setHandled(true);
        response.getWriter().println("<h1>Hello World</h1>");
    }

    public static void main(String[] args) throws Exception
    {
        Server server = new Server(8080);
        server.setHandler(new HelloWorld());
        server.start();
        server.join();
    }
}

我正在使用以下pom.xml：

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>
  <groupId>org.example</groupId>
  <artifactId>hello-world</artifactId>
  <version>0.1-SNAPSHOT</version>
  <packaging>jar</packaging>
  <name>Jetty HelloWorld</name>

  <properties>
      <jettyVersion>9.3.9.v20160517</jettyVersion>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.eclipse.jetty</groupId>
      <artifactId>jetty-server</artifactId>
      <version>${jettyVersion}</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>exec-maven-plugin</artifactId>
        <version>1.1</version>
        <executions>
          <execution><goals><goal>java</goal></goals></execution>
        </executions>
        <configuration>
          <mainClass>org.example.HelloWorld</mainClass>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

更新

Lars Gendner是正确的，我的Macbook上仍然运行HelloWorld进程：

# ps -ef | grep HelloWorld
  501   944     1   0  6:58pm ??         0:04.20 /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/bin/java -classpath /Users/afarber/src/JettyMavenHelloWorld/target/classes:/Users/afarber/.m2/repository/org/eclipse/jetty/jetty-server/9.0.2.v20130417/jetty-server-9.0.2.v20130417.jar:/Users/afarber/.m2/repository/org/eclipse/jetty/orbit/javax.servlet/3.0.0.v201112011016/javax.servlet-3.0.0.v201112011016.jar:/Users/afarber/.m2/repository/org/eclipse/jetty/jetty-http/9.0.2.v20130417/jetty-http-9.0.2.v20130417.jar:/Users/afarber/.m2/repository/org/eclipse/jetty/jetty-util/9.0.2.v20130417/jetty-util-9.0.2.v20130417.jar:/Users/afarber/.m2/repository/org/eclipse/jetty/jetty-io/9.0.2.v20130417/jetty-io-9.0.2.v20130417.jar org.example.HelloWorld
  501   948     1   0  6:58pm ??         0:03.89 /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/bin/java -classpath /Users/afarber/src/JettyMavenHelloWorld/target/classes:/Users/afarber/.m2/repository/org/eclipse/jetty/jetty-server/9.0.2.v20130417/jetty-server-9.0.2.v20130417.jar:/Users/afarber/.m2/repository/org/eclipse/jetty/orbit/javax.servlet/3.0.0.v201112011016/javax.servlet-3.0.0.v201112011016.jar:/Users/afarber/.m2/repository/org/eclipse/jetty/jetty-http/9.0.2.v20130417/jetty-http-9.0.2.v20130417.jar:/Users/afarber/.m2/repository/org/eclipse/jetty/jetty-util/9.0.2.v20130417/jetty-util-9.0.2.v20130417.jar:/Users/afarber/.m2/repository/org/eclipse/jetty/jetty-io/9.0.2.v20130417/jetty-io-9.0.2.v20130417.jar org.example.HelloWorld

端口8080正在使用中：

# netstat -an | grep -w 8080
tcp46      0      0  *.8080                 *.*                    LISTEN

但我当然不想一次又一次地更改端口号（并产生更多进程）。

相反（作为NetBeans和Jetty新手）我想知道如何在NetBeans中正确停止嵌入式Jetty？ （除了awk /HelloWorld/ '{print $2}'| xargs kill解决方法）

更新2：

将jetty-maven-plugin添加到pom.xml并运行mvn jetty:run确实会在端口8080启动Web服务器，但它只显示红色文本：

Directory: /

以下是完整的Maven输出：

# mvn jetty:run
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Jetty HelloWorld 0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] >>> jetty-maven-plugin:9.3.9.v20160517:run (default-cli) > test-compile @ hello-world >>>
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ hello-world ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /Users/afarber/src/jetty-newbie/JettyMavenHelloWorld/src/main/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ hello-world ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!
[INFO] Compiling 1 source file to /Users/afarber/src/jetty-newbie/JettyMavenHelloWorld/target/classes
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ hello-world ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /Users/afarber/src/jetty-newbie/JettyMavenHelloWorld/src/test/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ hello-world ---
[INFO] No sources to compile
[INFO] 
[INFO] <<< jetty-maven-plugin:9.3.9.v20160517:run (default-cli) < test-compile @ hello-world <<<
[INFO] 
[INFO] --- jetty-maven-plugin:9.3.9.v20160517:run (default-cli) @ hello-world ---
[INFO] Configuring Jetty for project: Jetty HelloWorld
[INFO] webAppSourceDirectory not set. Trying src/main/webapp
[INFO] webAppSourceDirectory /Users/afarber/src/jetty-newbie/JettyMavenHelloWorld/src/main/webapp does not exist. Trying /Users/afarber/src/jetty-newbie/JettyMavenHelloWorld/target/webapp-tmp
[INFO] Reload Mechanic: automatic
[INFO] Classes = /Users/afarber/src/jetty-newbie/JettyMavenHelloWorld/target/classes
[INFO] Logging initialized @3610ms
[INFO] Context path = /
[INFO] Tmp directory = /Users/afarber/src/jetty-newbie/JettyMavenHelloWorld/target/tmp
[INFO] Web defaults = org/eclipse/jetty/webapp/webdefault.xml
[INFO] Web overrides =  none
[INFO] web.xml file = null
[INFO] Webapp directory = /Users/afarber/src/jetty-newbie/JettyMavenHelloWorld/target/webapp-tmp
[INFO] jetty-9.3.9.v20160517
[INFO] Started o.e.j.m.p.JettyWebAppContext@58a63629{/,file:///Users/afarber/src/jetty-newbie/JettyMavenHelloWorld/target/webapp-tmp/,AVAILABLE}{file:///Users/afarber/src/jetty-newbie/JettyMavenHelloWorld/target/webapp-tmp/}
[INFO] Started ServerConnector@75a118e6{HTTP/1.1,[http/1.1]}{0.0.0.0:8080}
[INFO] Started @4608ms
[INFO] Started Jetty Server
[INFO] Using Non-Native Java sun.nio.fs.PollingWatchService
[WARNING] Quiet Time is too low for non-native WatchService [sun.nio.fs.PollingWatchService]: 1000 < 5000 ms (defaulting to 5000 ms)

2 个答案:

答案 0 :(得分：1)

我很确定你已经在端口8080上运行了一个进程。如果你跟踪该进程并结束它（也许你试图启动Jetty两次而不是正确结束已经运行的Jetty实例？），你的进程应该开始了。

您也可以尝试使用其他端口而不是8080（例如8090）。

答案 1 :(得分：1)

您应该将jetty-maven-plugin添加到您的pom并尝试停止服务器。码头停止目标寻找插件配置。请参阅此码头文档Jetty Stop goal

  

停止目标会停止正在运行的码头实例。要使用它，你需要   使用特殊的端口号和密钥配置插件。同样的   端口号和密钥也将用于启动的其他目标   码头。

这是jetty-stop的插件配置，

<plugin>
  <groupId>org.eclipse.jetty</groupId>
  <artifactId>jetty-maven-plugin</artifactId>
  <version>@project.version@</version>
  <configuration>
    <stopPort>9966</stopPort>
    <stopKey>foo</stopKey>
    <stopWait>10</stopWait>
  </configuration>
</plugin>

启动jetty后，发出以下命令，

mvn jetty:stopmvn jetty:stop

或只是尝试

mvn jetty:stop

mvn jetty:run命令将启动服务器。有关其他目标/配置，请参阅Configuring Jetty Maven plugin

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