问题
I'm running a trivial Hello World web application using servlet-3.1, jetty-9 running on jdk-8 and using the maven-jetty-plugin.
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);
}
}
And well mapped in the web.xml file:
<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>
But it seems that jetty can't fin my servlet class when running mvn jetty:run , what am I missing here ?
--- 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>
Update:
Worked after changing the configuration of maven-compiler-plugin from 1.8 to 1.7, What'is wrong with using java-8 with jetty-9 ?
回答1:
To make this work, you have to add ASM 5 to the dependencies of the jetty-maven-plugin for the time being
<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>
回答2:
check this
http://vaskoz.wordpress.com/2013/12/18/fix-jetty-9-1-for-jdk8-annotations/
Jetty 9.1.0 comes bundled with ASM 4.1 but running with bytecode level 1.8 and annotations causes the following error: java.lang.RuntimeException: Error scanning file PingController.class at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:705)
来源：https://stackoverflow.com/questions/22806946/getting-error-scanning-file-when-running-jetty-9-on-java-8-using-the-maven-jetty