我是泽西岛的新手，正在尝试创建使用 rest Web 服务的项目并响应我的 json。 以下是我的POM.xml
<project
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.modaltestapp</groupId>
<artifactId>modaltestapp</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<groupId>com.modaltestapp</groupId>
<artifactId>modaltestapp-api</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>modaltestapp-api Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<slf4j.version>1.7.9</slf4j.version>
<logback.version>1.1.2</logback.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-server</artifactId>
<version>1.9</version>
</dependency>
</dependencies>
<build>
<finalName>modaltestapp-api</finalName>
</build>
网络.xml
<web-app id="WebApp_ID" version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Restful Web Application</display-name>
<servlet>
<servlet-name>helloworld</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.modaltestapp.service</param-value>
</init-param>
<init-param>
<param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>helloworld</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
而java文件是：
@GET
@Path("/print")
@Produces({ MediaType.APPLICATION_JSON }) // add MediaType.APPLICATION_XML
// if you want XML as well
// (don't forget
// @XmlRootElement)
public List<RegistrationDto> getAllMessages() throws Exception {
List<RegistrationDto> messages = new ArrayList<RegistrationDto>();
RegistrationDto m = new RegistrationDto();
m.setFirstName("Nabi");
m.setLastName("Zamani");
m.setAge(30);
messages.add(m);
System.out.println("getAllMessages(): found " + messages.size() + " message(s) on DB");
return messages; // do not use Response object because this causes
// issues when generating XML automatically
}
但是当我构建并运行应用程序时，它向我显示错误：
INFO: Starting Servlet Engine: Apache Tomcat/9.0.0.M21
Jul 03, 2017 11:12:24 AM org.apache.catalina.core.ApplicationContext log
INFO: Marking servlet [helloworld] as unavailable
Jul 03, 2017 11:12:24 AM org.apache.catalina.core.StandardContext
loadOnStartup
SEVERE: Servlet [helloworld] in web application [/modaltestapp-api] threw
load() exception
java.lang.ClassNotFoundException:
com.sun.jersey.spi.container.servlet.ServletContainer
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1275)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1109)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:508)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:489)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:119)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1050)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:989)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4921)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5231)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1439)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1429)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:953)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:872)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1439)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1429)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:953)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:793)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.startup.Catalina.start(Catalina.java:656)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:355)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495)
Jul 03, 2017 11:12:24 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-nio-8080"]
Jul 03, 2017 11:12:24 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-nio-8009"]
Jul 03, 2017 11:12:24 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 317 ms
我该如何解决这个问题？我正在使用Apache Tomcat 9。
我认为这个线程是针对同一问题的。您可以参考这些答案。 链接 ： java.lang.ClassNotFoundException： com.sun.jersey.spi.container.servlet.ServletContainer
您可以按照这篇文章来解决您的问题。确保你拥有所有的罐子。我看到你的pom有这个maven依赖"jersey-servlet"不见了。
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-servlet</artifactId>
<version>1.17</version>