使用maven jetty插件在java 8上运行jetty 9时出现错误扫描文件[重复]

Question

我正在使用servlet-3.1、jetty-9 在jdk-8 上运行并使用maven-jetty-plugin 运行一个简单的Hello World Web 应用程序。

public class HelloWorldServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)  {
        try {
            String message = "Hello Jetty From the HelloWorldServlet";
            OutputStream stream = response.getOutputStream();
            stream.write(message.getBytes());
            stream.flush();
        } catch (IOException ex) {
            Logger.getLogger(HelloWorldServlet.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

并在web.xml 文件中很好地映射：

<servlet>
        <servlet-name>hello</servlet-name>
        <servlet-class>org.tarrsalah.jetty.example.HelloWorldServlet</servlet-class>                
    </servlet>

    <servlet-mapping>
        <servlet-name>hello</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>

但是在运行 mvn jetty:run 时，码头似乎无法找到我的 servlet 类，我在这里缺少什么？

--- jetty-maven-plugin:9.1.3.v20140225:run (default-cli) @ jetty-example ---
2014-04-02 10:09:46.126:INFO::main: Logging initialized @12796ms
Configuring Jetty for project: jetty-example
webAppSourceDirectory not set. Trying src/main/webapp
Reload Mechanic: automatic
Classes = /home/tarrsalah/src/misc/jetty-exampe/target/classes
Context path = /
Tmp directory = /home/tarrsalah/src/misc/jetty-exampe/target/tmp
Web defaults = org/eclipse/jetty/webapp/webdefault.xml
Web overrides =  none
web.xml file = file:/home/tarrsalah/src/misc/jetty-exampe/src/main/webapp/WEB-INF/web.xml
Webapp directory = /home/tarrsalah/src/misc/jetty-exampe/src/main/webapp
2014-04-02 10:09:46.291:INFO:oejs.Server:main: jetty-9.1.3.v20140225
2014-04-02 10:09:46.954:INFO:oeja.AnnotationConfiguration:main: Scanned 1 container path jars, 0 WEB-INF/lib jars, 1 WEB-INF/classes dirs in 82ms for context o.e.j.m.p.JettyWebAppContext@1f38957{/,file:/home/tarrsalah/src/misc/jetty-exampe/src/main/webapp/,STARTING}{file:/home/tarrsalah/src/misc/jetty-exampe/src/main/webapp/}
2014-04-02 10:09:46.954:WARN:oejw.WebAppContext:main: Failed startup of context o.e.j.m.p.JettyWebAppContext@1f38957{/,file:/home/tarrsalah/src/misc/jetty-exampe/src/main/webapp/,STARTING}{file:/home/tarrsalah/src/misc/jetty-exampe/src/main/webapp/}
java.lang.RuntimeException: Error scanning file HelloWorldServlet.class
    at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:705)
    at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:686)
    at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:686)
    at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:686)
    at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:686)
    at org.eclipse.jetty.annotations.AnnotationParser.parse(AnnotationParser.java:821)
    at org.eclipse.jetty.annotations.AnnotationConfiguration$ParserTask.call(AnnotationConfiguration.java:159)
    at org.eclipse.jetty.annotations.AnnotationConfiguration$1.run(AnnotationConfiguration.java:542)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:607)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:536)
    at java.lang.Thread.run(Thread.java:744)
Caused by: 
java.lang.IllegalArgumentException
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.eclipse.jetty.annotations.AnnotationParser.scanClass(AnnotationParser.java:970)
    at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:700)
    at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:686)
    at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:686)
    at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:686)
    at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:686)
    at org.eclipse.jetty.annotations.AnnotationParser.parse(AnnotationParser.java:821)
    at org.eclipse.jetty.annotations.AnnotationConfiguration$ParserTask.call(AnnotationConfiguration.java:159)
    at org.eclipse.jetty.annotations.AnnotationConfiguration$1.run(AnnotationConfiguration.java:542)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:607)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:536)
    at java.lang.Thread.run(Thread.java:744)
2014-04-02 10:09:46.958:WARN:oejsh.RequestLogHandler:main: !RequestLog
2014-04-02 10:09:47.108:INFO:oejs.ServerConnector:main: Started ServerConnector@506594a5{HTTP/1.1}{0.0.0.0:8080}
2014-04-02 10:09:47.109:INFO:oejs.Server:main: Started @13779ms
Started Jetty Server

pom.xml

<plugin>
    <groupId>org.eclipse.jetty</groupId>
    <artifactId>jetty-maven-plugin</artifactId>
    <version>9.1.3.v20140225</version>              
</plugin>

---

更新：

将maven-compiler-plugin 的配置从1.8 更改为1.7 后工作，将java-8 与jetty-9 一起使用有什么问题？

Answer 1

检查一下

http://vaskoz.wordpress.com/2013/12/18/fix-jetty-9-1-for-jdk8-annotations/

Jetty 9.1.0 与 ASM 4.1 捆绑在一起，但使用字节码级别 1.8 和注释运行会导致以下错误： java.lang.RuntimeException：扫描文件 PingController.class 时出错 在 org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:705)

Answer 2

为了使这项工作，您必须暂时将 ASM 5 添加到 jetty-maven-plugin 的依赖项中

<plugin>
    <groupId>org.eclipse.jetty</groupId>
    <artifactId>jetty-maven-plugin</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.ow2.asm</groupId>
            <artifactId>asm</artifactId>
            <version>5.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.ow2.asm</groupId>
            <artifactId>asm-commons</artifactId>
            <version>5.0.2</version>
        </dependency>
    </dependencies>
</plugin>