泽西servlet异常tomcat jersey

Question

我在尝试使用maven将servlet部署到Tomcat时遇到问题; 我在其他帖子中一直在阅读这个问题,但仍无法通过答案/建议取得成功.

无论我在尝试什么,我都会得到这个例外:

javax.servlet.ServletException:用于servlet的Servlet.init()Jersey Web应用程序引发了异常org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve. java:79)org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)org.apache.coyote.http11.AbstractHttp11Processor.进程(AbstractHttp11Processor.java:1091)org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process(AbstractProtocol.java:673)org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun(NioEndpoint.java:1500)org. apache.tomcat.util.net.NioEndpoint $ SocketProcessor.run(NioEndpoint.java:1456)java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)java.util.concurrent.ThreadPoolExecutor $ Worker.run(ThreadPoolExecutor. java:615)org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable .run(TaskThread.java:61)java.lang.Thread.run(Thread.java:745)root cause com.sun.jersey.api.container.ContainerException:ResourceConfig实例不包含任何根资源类.com.sun.jersey.server.impl.application.RootResourceUriRules.(RootResourceUriRules.java:99)com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1359)com.sun.jersey.server .impl.application.WebApplicationImpl.access $ 700(WebApplicationImpl.java:180)com.sun.jersey.server.impl.application.WebApplicationImpl $ 13.f(WebApplicationImpl.java:799)com.sun.jersey.server.impl.application .WebApplicationImpl $ 13.f(WebApplicationImpl.java:795)com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl. java:795)com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:790)com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:509)com. sun.jersey.spi.container.servlet.ServletContainer $ InternalWebComponent.initiate(ServletContainer.java:339)com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:605)com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:207)com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:394)com. sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:577)javax.servlet.GenericServlet.init(GenericServlet.java:158)org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java: 502)org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)org.apache.catalina.connector.CoyoteAdapter.service( CoyoteAdapter.java:518)org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process(AbstractProtocol.java:673)org.apache.tomcat.util. net.NioEndpoint $ SocketProcessor.doRun(NioEndpoint.java:1500)org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.run(NioEndpoint.java:145 6)java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)java.util.concurrent.ThreadPoolExecutor $ Worker.run(ThreadPoolExecutor.java:615)org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable. run(TaskThread.java:61)java.lang.Thread.run(Thread.java:745)

这是我的web.xml文件:

<servlet>
    <servlet-name>Jersey Web Application</servlet-name>
    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
    <init-param>
    <param-name>
    com.sun.jersey.config.property.packages
    </param-name>
    <param-value>com.rest.example
    </param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>Jersey Web Application</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>

还有我的pom.xml

<dependencies>
<dependency>
    <groupId>com.oracle</groupId>
    <artifactId>asm.jar</artifactId>
    <version>20041228.180559</version>
</dependency>
<dependency>
    <groupId>com.oracle</groupId>
    <artifactId>jersey-bundle.jar</artifactId>
    <version>1.19</version>
</dependency>
<dependency>
    <groupId>com.oracle</groupId>
    <artifactId>jersey-server.jar</artifactId>
    <version>1.19</version>
</dependency>
<dependency>
    <groupId>com.oracle</groupId>
    <artifactId>jersey-core.jar</artifactId>
    <version>1.8</version>
    <type>pom.lastUpdated</type>
</dependency>

sum.java文件

package com.rest.example;

import javax.ws.rs.Path;
import javax.ws.rs.GET;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

public class sum {
@Path("/hello")

@GET
@Produces(MediaType.TEXT_PLAIN)
public String sayHello() 
{
        return "Hello World";
    }

}

以防万一:

我已经尝试过清洁并再次建造它,但仍然没有变化; 我错过了什么？谢谢.

Answer 1

错误信息:

ResourceConfig实例不包含任何根资源类.

<init-param>
    <param-name>com.sun.jersey.config.property.packages</param-name>
    <param-value>com.rest.example</param-value>
</init-param>

上面告诉Jersey扫描com.rest.example包中注释的类@Provider,@Path以便它可以注册它们.该错误告诉您在应用程序加载期间没有注册资源类.原因:

public class sum {
@Path("/hello")

该@Path注释应该去顶类定义的,而不是下面.Jersey发现没有资源类,因为类上没有@Path注释.