写代码时出现了这样的报错信息
com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.
at com.sun.jersey.server.impl.application.RootResourceUriRules.<init>(RootResourceUriRules.java:103)
at com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1182)
at com.sun.jersey.server.impl.application.WebApplicationImpl.access$600(WebApplicationImpl.java:161)
at com.sun.jersey.server.impl.application.WebApplicationImpl$12.f(WebApplicationImpl.java:698)
at com.sun.jersey.server.impl.application.WebApplicationImpl$12.f(WebApplicationImpl.java:695)
at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:197)
at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:695)
at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:690)
at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:438)
at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:287)
at com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:587)
at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:213)
at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:342)
at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:516)
at javax.servlet.GenericServlet.init(GenericServlet.java:158)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1284)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1197)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1087)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5210)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5493)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1229)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1875)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
这是因为 使用向导创建web工程时 自动在 web.xml文件内生成了一个Servlet的
<servlet>
<description>JAX-RS Tools Generated - Do not modify</description>
<servlet-name>JAX-RS Servlet</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>JAX-RS Servlet</servlet-name>
<url-pattern>/jaxrs/*</url-pattern>
</servlet-mapping>
启动服务器加载项目，就会去xml中加载这个servlet而实际上我们并没有创建这个 JAX-RS Servlet 所以将对应的servlet 和servlet-mapping 标签注掉或者删掉就可以了
<!-- <servlet>
<description>JAX-RS Tools Generated - Do not modify</description>
<servlet-name>JAX-RS Servlet</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>JAX-RS Servlet</servlet-name>
<url-pattern>/jaxrs/*</url-pattern>
</servlet-mapping> -->
然后，重新启动服务器，就不会再报错
三月 10, 2018 4:54:05 下午 org.apache.catalina.core.AprLifecycleListener init
信息: Loaded APR based Apache Tomcat Native library 1.1.29 using APR version 1.4.8.
三月 10, 2018 4:54:05 下午 org.apache.catalina.core.AprLifecycleListener init
信息: APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
三月 10, 2018 4:54:06 下午 org.apache.catalina.core.AprLifecycleListener initializeSSL
信息: OpenSSL successfully initialized (OpenSSL 1.0.1e 11 Feb 2013)
三月 10, 2018 4:54:07 下午 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["http-apr-8080"]
三月 10, 2018 4:54:07 下午 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["ajp-apr-8009"]
三月 10, 2018 4:54:07 下午 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 2989 ms
三月 10, 2018 4:54:07 下午 org.apache.catalina.core.StandardService startInternal
信息: Starting service Catalina
三月 10, 2018 4:54:07 下午 org.apache.catalina.core.StandardEngine startInternal
信息: Starting Servlet Engine: Apache Tomcat/7.0.53
三月 10, 2018 4:54:07 下午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory E:\software\tomcat7\apache-tomcat-7.0.53\webapps\docs
三月 10, 2018 4:54:08 下午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory E:\software\tomcat7\apache-tomcat-7.0.53\webapps\examples
三月 10, 2018 4:54:09 下午 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
三月 10, 2018 4:54:09 下午 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
三月 10, 2018 4:54:09 下午 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: attributeAdded('org.apache.jasper.compiler.TldLocationsCache', 'org.apache.jasper.compiler.TldLocationsCache@473bb93a')
三月 10, 2018 4:54:09 下午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory E:\software\tomcat7\apache-tomcat-7.0.53\webapps\host-manager
三月 10, 2018 4:54:09 下午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory E:\software\tomcat7\apache-tomcat-7.0.53\webapps\lst
三月 10, 2018 4:54:13 下午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory E:\software\tomcat7\apache-tomcat-7.0.53\webapps\manager
三月 10, 2018 4:54:13 下午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory E:\software\tomcat7\apache-tomcat-7.0.53\webapps\ROOT
三月 10, 2018 4:54:13 下午 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["http-apr-8080"]
三月 10, 2018 4:54:13 下午 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["ajp-apr-8009"]
三月 10, 2018 4:54:13 下午 org.apache.catalina.startup.Catalina start
信息: Server startup in 6809 ms
