球衣-ClassNotFoundException org.glassfish.jersey.servlet.ServletContainer

Question

When I deploy my rest api with jersey to a tomcat 7.0 server I get an error that has been discussed on stackoverflow quite often but I haven't been able to resolve it:

java.lang.ClassNotFoundException: org.glassfish.jersey.servlet.ServletContainer
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1892)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:495)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:477)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:113)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1133)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1072)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5362)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5660)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1700)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1690)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
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)

Things I have checked:

Avoiding duplicate jersey versions

<dependency>
    <groupId>org.glassfish.jersey.containers</groupId>
    <artifactId>jersey-container-servlet</artifactId>
    <version>${jersey2.version}</version>
</dependency>
<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-json-jackson</artifactId>
    <version>${jersey2.version}</version>
</dependency>
<dependency>
    <groupId>javax.ws.rs</groupId>
    <artifactId>javax.ws.rs-api</artifactId>
    <version>2.1</version>
</dependency>

So, ServletContainer is definitely imported

I notice however in the dependency hierarchy that the jersey servlet container is also imported through another library ( dropwizard-core -> dropwizard-jersey -> jersey-container-servlet: 2.16 ) and the versions differ (my version is 2.25.1 ). But it says omitted for conflict with 2.25.1

Where is Apache Tomcat v7.0 package library

My project was originally a pure Maven project and I added the Dynamic Web Project facet lateron. When I compare to a test project where I successfully tested a jersey rest api, I don't see the Apache Tomcat v7.0 libraries on my build path. In my test project I see

versus

WebContent/WEB-INF/lib is empty

As mentioned in this question the jersey libraries should be deployed to my WEB-INF/lib/ folder. I did Project -> Deployment Assembly -> Add -> Java Build Path Entries -> Maven Dependencies -> Finish . But as soon as I do Project -> Maven -> Update the step above is reset (ie I don't see Maven Dependencies in the Web Deployment Assembly anymore. Despite this is strange, in the successful test jersey project the lib folder is also empty.

EDIT

There is something more fundamental going wrong. In the successful jersey rest api, I got the subfolder structure

• target
  +---- generated-sources
  +---- JerseyRestDemo-0.0.1-SNAPSHOT
  +---- m2e-wtp
  +---------- web-resources
  +----------------- META-INF
  +-----------------------maven
  +---- maven-archiver
  +--------- pom.properties
  +---- test-classes
  
• WebContent
  +---- META-INF
  +--------- MANIFEST.MF
  +---- WEB-INF
  +--------- lib
  +----------web.xml

However, in my current project I just see

• target
  +----- generated-sources
  +---------- annotations
  +----- maven-status
  +---------- maven-compiler-plugin
  +--------------- compile
  
• WebContent
  +---- META-INF
  +--------- MANIFEST.MF
  +---- WEB-INF
  +--------- lib
  +----------web.xml

Thanks for your help

Answer 1

我在这篇文章之后再次将项目从maven转换为webapp，然后它起作用了