英文:
HTTP Status 500 javax.servlet.ServletException: Servlet.init() for servlet [Jersey RESTful App] threw exception java.lang.IllegalArgumentException
问题
<br>
<br>
我正在编写我的第一个Java REST应用程序。<br>
我正在遵循这个教程：<br>
https://www.tutorialspoint.com/restful/restful_first_application.htm<br>
但我遇到了这个错误：<br>
HTTP状态500 - 内部服务器错误
类型异常报告
消息Servlet.init()对于servlet [Jersey RESTful Application]引发了异常
描述服务器遇到了一个意外的情况，阻止了它无法完成请求。
异常
javax.servlet.ServletException：对于servlet [Jersey RESTful Application]的Servlet.init()引发了异常
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.base/java.lang.Thread.run(Thread.java:830)
根本原因
java.lang.IllegalArgumentException
jersey.repackaged.org.objectweb.asm.ClassReader.<init>(ClassReader.java:171)
jersey.repackaged.org.objectweb.asm.ClassReader.<init>(ClassReader.java:153)
jersey.repackaged.org.objectweb.asm.ClassReader.<init>(ClassReader.java:425)
org.glassfish.jersey.server.internal.scanning.AnnotationAcceptingListener.process(AnnotationAcceptingListener.java:170)
org.glassfish.jersey.server.ResourceConfig.scanClasses(ResourceConfig.java:915)
org.glassfish.jersey.server.ResourceConfig._getClasses(ResourceConfig.java:869)
org.glassfish.jersey.server.ResourceConfig.getClasses(ResourceConfig.java:775)
org.glassfish.jersey.server.ResourceConfig$RuntimeConfig.<init>(ResourceConfig.java:1206)
org.glassfish.jersey.server.ResourceConfig$RuntimeConfig.<init>(ResourceConfig.java:1178)
org.glassfish.jersey.server.ResourceConfig.createRuntimeConfig(ResourceConfig.java:1174)
org.glassfish.jersey.server.ApplicationHandler.<init>(ApplicationHandler.java:345)
org.glassfish.jersey.servlet.WebComponent.<init>(WebComponent.java:392)
org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:177)
org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:369)
javax.servlet.GenericServlet.init(GenericServlet.java:158)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.base/java.lang.Thread.run(Thread.java:830)
<br>
你能帮我吗？<br>
我查看了许多类似的主题和文章，还在Stack Overflow上查看了许多内容，但没有帮助我解决问题。<br>
<br>
我的规格：<br>
操作系统：Windows 10<br>
IDE：Eclipse版本：2020-06（4.16.0）<br>
应用服务器：apache-tomcat-9.0.38<br>
jaxrs-ri-2.25.1<br>
<br>
<br>
我将代码从教程网站复制到我的项目中，以确保我没有错误。<br>
Java文件：<br>
UserService.java<br>
package com.tutorialspoint;
import java.util.List;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
@Path("/UserService")
public class UserService {
UserDao userDao = new UserDao();
@GET
@Path("/users")
@Produces(MediaType.APPLICATION_XML)
public List<User> getUsers(){
return userDao.getAllUsers();
}
}
<br>
User.java<br>
package com.tutorialspoint;
import java.io.Serializable;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name = "user")
public class User implements Serializable {
private static final long serialVersionUID = 1L;
private int id;
private String name;
private String profession;
public User(){}
public User(int id, String name, String profession){
this.id = id;
this.name = name;
this.profession = profession;
}
public int getId() {
return id;
}
@XmlElement
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
@XmlElement
public void setName(String name
<details>
<summary>英文:</summary>
<br>
<br>
I am writing my first Java REST application.<br>
I was following this tutorial:<br>
https://www.tutorialspoint.com/restful/restful_first_application.htm<br>
but I am getting this error:<br>
HTTP Status 500 – Internal Server Error
Type Exception Report
Message Servlet.init() for servlet [Jersey RESTful Application] threw exception
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
javax.servlet.ServletException: Servlet.init() for servlet [Jersey RESTful Application] threw exception
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.base/java.lang.Thread.run(Thread.java:830)
Root Cause
java.lang.IllegalArgumentException
jersey.repackaged.org.objectweb.asm.ClassReader.<init>(ClassReader.java:171)
jersey.repackaged.org.objectweb.asm.ClassReader.<init>(ClassReader.java:153)
jersey.repackaged.org.objectweb.asm.ClassReader.<init>(ClassReader.java:425)
org.glassfish.jersey.server.internal.scanning.AnnotationAcceptingListener.process(AnnotationAcceptingListener.java:170)
org.glassfish.jersey.server.ResourceConfig.scanClasses(ResourceConfig.java:915)
org.glassfish.jersey.server.ResourceConfig._getClasses(ResourceConfig.java:869)
org.glassfish.jersey.server.ResourceConfig.getClasses(ResourceConfig.java:775)
org.glassfish.jersey.server.ResourceConfig$RuntimeConfig.<init>(ResourceConfig.java:1206)
org.glassfish.jersey.server.ResourceConfig$RuntimeConfig.<init>(ResourceConfig.java:1178)
org.glassfish.jersey.server.ResourceConfig.createRuntimeConfig(ResourceConfig.java:1174)
org.glassfish.jersey.server.ApplicationHandler.<init>(ApplicationHandler.java:345)
org.glassfish.jersey.servlet.WebComponent.<init>(WebComponent.java:392)
org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:177)
org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:369)
javax.servlet.GenericServlet.init(GenericServlet.java:158)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.base/java.lang.Thread.run(Thread.java:830)
<br>
Could you help me?<br>
I checked with many similiar topics and articles also here on Stack Overflow but nothing helped me.<br>
<br>
My specification:<br>
OS: Windows 10<br>
IDE: Eclipse Version: 2020-06 (4.16.0)<br>
Application server: apache-tomcat-9.0.38<br>
jaxrs-ri-2.25.1<br>
<br>
<br>
I copied code from tutorial website to my project to make sure I made no mistake.<br>
Java files:<br>
UserService.java<br>
package com.tutorialspoint;
import java.util.List;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
@Path("/UserService")
public class UserService {
UserDao userDao = new UserDao();
@GET
@Path("/users")
@Produces(MediaType.APPLICATION_XML)
public List<User> getUsers(){
return userDao.getAllUsers();
}
}
<br>
User.java<br>
package com.tutorialspoint;
import java.io.Serializable;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name = "user")
public class User implements Serializable {
private static final long serialVersionUID = 1L;
private int id;
private String name;
private String profession;
public User(){}
public User(int id, String name, String profession){
this.id = id;
this.name = name;
this.profession = profession;
}
public int getId() {
return id;
}
@XmlElement
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
@XmlElement
public void setName(String name) {
this.name = name;
}
public String getProfession() {
return profession;
}
@XmlElement
public void setProfession(String profession) {
this.profession = profession;
}
}
UserDao.java<br>
package com.tutorialspoint;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.List;
public class UserDao {
public List<User> getAllUsers(){
List<User> userList = null;
try {
File file = new File("Users.dat");
if (!file.exists()) {
User user = new User(1, "Mahesh", "Teacher");
userList = new ArrayList<User>();
userList.add(user);
saveUserList(userList);
}
else{
FileInputStream fis = new FileInputStream(file);
ObjectInputStream ois = new ObjectInputStream(fis);
userList = (List<User>) ois.readObject();
ois.close();
}
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
return userList;
}
private void saveUserList(List<User> userList){
try {
File file = new File("Users.dat");
FileOutputStream fos;
fos = new FileOutputStream(file);
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(userList);
oos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
web.xml<br>
<?xml version = "1.0" encoding = "UTF-8"?>
<web-app xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
xmlns = "http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id = "WebApp_ID" version = "3.0">
<display-name>User Management</display-name>
<servlet>
<servlet-name>Jersey RESTful Application</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>com.tutorialspoint</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>Jersey RESTful Application</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>
</details>
# 答案1
**得分**: 0
我使用 apache-tomcat-9.0.38 和 Jersey 2.16 使其工作。
<details>
<summary>英文:</summary>
I got it working by using apache-tomcat-9.0.38 and Jersey 2.16
</details>
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
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