I am started to read the Vaadin 7 CookBook and I got stuck at this point:
We are done and we can run our new web application. Go to the root of the project where pom.xml file is located and run the following command.
mvn jetty:start
I experienced some problems right away when I ran that command:
Maven: No plugin found for prefix 'jetty' in the current project...
This helped me:
http://blog.loxal.net/2014/03/maven-no-plugin-found-for-prefix-jetty.html
add something like the following to your ~/.m2/settings.xml org.mortbay.jetty ...to resolve this issue.
Now jetty starts:
$ mvn jetty:start
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] vaadin-in-maven-arch-parent
[INFO] vaadin-in-maven-arch-widgetset
[INFO] vaadin-in-maven-arch-ui
[INFO] vaadin-in-maven-arch-production
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building vaadin-in-maven-arch-parent 1.0
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> jetty-maven-plugin:8.1.16.v20140903:start (default-cli) > validate @ vaadin-in-maven-arch >>>
[INFO]
[INFO] <<< jetty-maven-plugin:8.1.16.v20140903:start (default-cli) < validate @ vaadin-in-maven-arch <<<
[INFO]
[INFO] --- jetty-maven-plugin:8.1.16.v20140903:start (default-cli) @ vaadin-in-maven-arch ---
[INFO] Configuring Jetty for project: vaadin-in-maven-arch-parent
[INFO] webAppSourceDirectory not set. Defaulting to /Users/user/vaadin-in-maven-arch/src/main/webapp
[INFO] Reload Mechanic: automatic
[INFO] Classes directory /Users/user/vaadin-in-maven-arch/target/classes does not exist
[INFO] Context path = /
[INFO] Tmp directory = /Users/user/vaadin-in-maven-arch/target/tmp
[INFO] Web defaults = org/eclipse/jetty/webapp/webdefault.xml
[INFO] Web overrides = none
[INFO] web.xml file = null
[INFO] Webapp directory = /Users/user/vaadin-in-maven-arch/src/main/webapp
2015-01-25 17:29:25.569:INFO:oejs.Server:jetty-8.1.16.v20140903
2015-01-25 17:29:25.758:INFO:oejpw.PlusConfiguration:No Transaction manager found - if your webapp requires one, please configure one.
2015-01-25 17:29:26.526:WARN:oejsh.RequestLogHandler:!RequestLog
2015-01-25 17:29:26.555:INFO:oejs.AbstractConnector:Started SelectChannelConnector@0.0.0.0:8080
[INFO] Started Jetty Server
Moving forward in the book they say:
The application will be running on http://localhost:8080.
But when I open http://localhost:8080 in the browser I get a 404 Not Found:
I also tried http://localhost:8080/webapp, http://localhost:8080/vaadin-in-maven-arch/target, http://localhost:8080/main/webapp, but neither of them worked.
Where is the issue and how can I fix?
Thanks for the attention!
EDIT: Here is the content of the Project Object Model:
<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>app</groupId>
<artifactId>vaadin-in-maven-arch</artifactId>
<packaging>pom</packaging>
<version>1.0</version>
<name>vaadin-in-maven-arch-parent</name>
<properties>
<vaadin.version>7.4.0.beta2</vaadin.version>
<vaadin.plugin.version>${vaadin.version}</vaadin.plugin.version>
<jetty.plugin.version>9.2.3.v20140905</jetty.plugin.version>
<project.source.version>1.7</project.source.version>
<project.target.version>1.7</project.target.version>
<project.encoding>UTF-8</project.encoding>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.0</version>
<configuration>
<encoding>${project.encoding}</encoding>
<source>${project.source.version}</source>
<target>${project.target.version}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.6</version>
<configuration>
<encoding>${project.encoding}</encoding>
</configuration>
</plugin>
</plugins>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.3</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
<plugin>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-maven-plugin</artifactId>
<version>${vaadin.plugin.version}</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.5</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>2.4</version>
</plugin>
</plugins>
</pluginManagement>
</build>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-server</artifactId>
<version>${vaadin.version}</version>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-push</artifactId>
<version>${vaadin.version}</version>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-client</artifactId>
<version>${vaadin.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-client-compiler</artifactId>
<version>${vaadin.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-themes</artifactId>
<version>${vaadin.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
<repositories>
<repository>
<id>vaadin-addons</id>
<url>http://maven.vaadin.com/vaadin-addons</url>
</repository>
<repository>
<id>vaadin-snapshots</id>
<url>http://oss.sonatype.org/content/repositories/vaadin-snapshots/</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
</snapshots>
</repository>
</repositories>
<modules>
<module>vaadin-in-maven-arch-widgetset</module>
<module>vaadin-in-maven-arch-ui</module>
<module>vaadin-in-maven-arch-production</module>
</modules>
</project>
You are most likely trying to run jetty in a wrong folder. Try in the vaadin-in-maven-arch-ui folder instead.
Also instead of jetty:start try with jetty:run.
来源：https://stackoverflow.com/questions/28137684/why-when-i-run-a-project-created-with-maven-on-jetty-it-is-not-found-404