HTTP 状态 500 - java.lang.ExceptionInInitializerError --> Java Restful Web 服务
Posted
技术标签:
【中文标题】HTTP 状态 500 - java.lang.ExceptionInInitializerError --> Java Restful Web 服务【英文标题】：HTTP Status 500 - java.lang.ExceptionInInitializerError --> Java Restful Web service 【发布时间】：2017-08-03 22:05:21 【问题描述】：我正在创建一个连接到 mysql 数据库的 Web 服务。 下面是我使用 Maven、Hibernate、MySQL 工作台编写的代码。 错误在最后，我猜这个错误一定是 HibernateUtil 或 PersonDao 但我不确定。
POM Dependencies
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.CRUD</groupId>
<artifactId>DB_Services</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>DB_Services</name>
<properties>
<endorsed.dir>$project.build.directory/endorsed</endorsed.dir>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<!--Repositories (Added) Start-->
<repositories>
<repository>
<id>org.jboss.resteasy</id>
<url>http//repository.jboss.org/maven2/</url>
</repository>
</repositories>
<!--Repositories (Added) End-->
<dependencies>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>6.0</version>
<scope>provided</scope>
</dependency>
<!--dependency (Added) Start-->
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>2.3.6.Final</version> <!-- 3.1.1.Final-->
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxb-provider</artifactId>
<version>2.3.6.Final</version> <!-- 3.1.1.Final-->
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jettison-provider</artifactId>
<version>2.3.6.Final</version> <!-- 3.1.1.Final-->
</dependency>
<!--Database and hibernate-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.25</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.2.2.Final</version>
</dependency>
<!--dependency (Added) End-->
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
<compilerArguments>
<endorseddirs>$endorsed.dir</endorseddirs>
</compilerArguments>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.1.1</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.1</version>
<executions>
<execution>
<phase>validate</phase>
<goals>
<goal>copy</goal>
</goals>
<configuration>
<outputDirectory>$endorsed.dir</outputDirectory>
<silent>true</silent>
<artifactItems>
<artifactItem>
<groupId>javax</groupId>
<artifactId>javaee-endorsed-api</artifactId>
<version>6.0</version>
<type>jar</type>
</artifactItem>
</artifactItems>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
Deployment Descriptor
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<display-name> DB_Services</display-name>
<listener>
<listener- class>org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap</listener- class>
</listener>
<servlet>
<servlet-name>Resteasy</servlet-name>
<servlet- class>org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Resteasy</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
<context-param>
<param-name>resteasy.scan</param-name>
<param-value>true</param-value>
</context-param>
<context-param>
<param-name>resteasy.servlet.mapping.prefix</param-name>
<param-value>/</param-value>
</context-param>
</web-app>
Person class
Package:com.crud.db_services.model
package com.crud.db_services.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
@Entity
@Table(name = "person")
@XmlRootElement(name = "person")
@XmlType(propOrder = "id", "fullName", "age")
public class Person
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private int id;
@Column(name = "fullName")
private String fullName;
@Column(name = "age")
private int age;
@XmlElement
public int getId()
return id;
public void setId(int id)
this.id = id;
@XmlElement
public String getFullName()
return fullName;
public void setFullName(String fullName)
this.fullName = fullName;
@XmlElement
public int getAge()
return age;
public void setAge(int age)
this.age = age;
Service class
Package:com.crud.event_planner.services
package com.crud.event_planner.services;
import com.crud.event_planner.dao.PersonDao;
import com.crud.event_planner.model.Person;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
@Path("service")
public class Service
private PersonDao personDao = new PersonDao();
@GET
@Path("/getPersonByIdXML/id")
@Produces(MediaType.APPLICATION_XML)
public Person getPersonByIdXML(@PathParam("id") int id)
return personDao.getPersonById(id);
@GET
@Path("/getPersonByIdJSON/id")
@Produces(MediaType.APPLICATION_JSON)
public Person getPersonByIdJSON(@PathParam("id") int id)
return personDao.getPersonById(id);
@GET
@Path("/getAllPersonInXML")
@Produces(MediaType.APPLICATION_XML)
public List<Person> getAllPersonInXML()
return personDao.getAllPerson();
Hibernate Configuration
Hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-4.0.dtd">
<hibernate-configuration>
<session-factory>
<!--Database Connection Settings-->
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<!--database name -->
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/event_planner</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">password</property>
<!--SQL Dialect-->
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<!--Write all executed SQL statements to stdout-->
<property name="show_sql">true</property>
<!--below need to change, check Source Packages and inside folders -->
<!-- Name of the entity classes -->
<mapping class="com.crud.db_services.model.Person"></mapping>
</session-factory>
</hibernate-configuration>
Hibernate Utility Class
A class which help us read our configuration file
Package: com.crud.db_services.util
package com.crud.db_services.util;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateUtil
private static final SessionFactory sessionFactory;
static
try
// Create the SessionFactory from standard (hibernate.cfg.xml)
// config file.
sessionFactory = new Configuration().configure().buildSessionFactory();
catch (Throwable ex)
// Log the exception.
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
public static SessionFactory getSessionFactory()
return sessionFactory;
Data Access Object (DAO)
package com.crud.db_services.dao;
import com.crud.db_services.model.Person;
import com.crud.db_services.util.HibernateUtil;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
public class PersonDao
SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
public Person getPersonById(int id)
Person person = null;
Session session = null;
try
session = sessionFactory.openSession();
session.beginTransaction();
person = (Person) session.createQuery("from Person p where p.id = :ID").setParameter("ID", id).uniqueResult();
session.getTransaction().commit();
catch (Exception ex)
if (session != null)
session.getTransaction().rollback();
finally
if (session != null)
session.close();
return person;
ERROR
HTTP Status 500 - java.lang.ExceptionInInitializerError
type Exception report
message java.lang.ExceptionInInitializerError
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.jboss.resteasy.spi.UnhandledException: java.lang.ExceptionInInitializerError
org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(Syn chronousDispatcher.java:365)
org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:233)
org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:209)
org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:557)
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:524)
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:126)
org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service (ServletContainerDispatcher.java:208)
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.ExceptionInInitializerError
com.crud.db_services.util.HibernateUtil.<clinit>(HibernateUtil.java:25)
com.crud.db_services.dao.PersonDao.<init>(PersonDao.java:13)
com.crud.db_services.services.Service.<init>(Service.java:28)
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.lang.reflect.Constructor.newInstance(Constructor.java:422)
org.jboss.resteasy.core.ConstructorInjectorImpl.construct(ConstructorInjectorImpl.java:82)
org.jboss.resteasy.plugins.server.resourcefactory.POJOResourceFactory.createResource(POJOResourceFactory.java:43)
org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:215)
org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:542)
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:524)
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:126)
org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208)
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
org.hibernate.HibernateException: Could not parse configuration: /hibernate.cfg.xml
org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2075)
org.hibernate.cfg.Configuration.configure(Configuration.java:1987)
org.hibernate.cfg.Configuration.configure(Configuration.java:1966)
com.crud.db_services.util.HibernateUtil.<clinit>(HibernateUtil.java:21)
com.crud.db_services.dao.PersonDao.<init>(PersonDao.java:13)
com.crud.db_services.services.Service.<init>(Service.java:28)
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.lang.reflect.Constructor.newInstance(Constructor.java:422)
org.jboss.resteasy.core.ConstructorInjectorImpl.construct(ConstructorInjectorImpl.java:82)
org.jboss.resteasy.plugins.server.resourcefactory.POJOResourceFactory.createResource(POJOResourceFactory.java:43)
org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:215)
org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:542)
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:524)
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:126)
org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208)
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
org.dom4j.DocumentException: http://hibernate.org/dtd/hibernate-configuration-4.0.dtd Nested exception: http://hibernate.org/dtd/hibernate-configuration-4.0.dtd
org.dom4j.io.SAXReader.read(SAXReader.java:484)
org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2067)
org.hibernate.cfg.Configuration.configure(Configuration.java:1987)
org.hibernate.cfg.Configuration.configure(Configuration.java:1966)
com.crud.db_services.util.HibernateUtil.<clinit>(HibernateUtil.java:21)
com.crud.db_services.dao.PersonDao.<init>(PersonDao.java:13)
com.crud.db_services.services.Service.<init>(Service.java:28)
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.lang.reflect.Constructor.newInstance(Constructor.java:422)
org.jboss.resteasy.core.ConstructorInjectorImpl.construct(ConstructorInjectorImpl.java:82)
org.jboss.resteasy.plugins.server.resourcefactory.POJOResourceFactory.createResource(POJOResourceFactory.java:43)
org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:215)
org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:542)
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:524)
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:126)
org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208)
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.75 logs.
Apache Tomcat/7.0.75
【问题讨论】：
【参考方案1】：读取hibernate配置文件时出错：
org.hibernate.HibernateException: Could not parse configuration: /hibernate.cfg.xml
问题在于hibernate.cfg.xml 文件，代码如下：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-4.0.dtd">
用下面的代码替换上面的行：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.org/dtd/hibernate-configuration-3.0.dtd">
【讨论】：
以上是关于HTTP 状态 500 - java.lang.ExceptionInInitializerError --> Java Restful Web 服务的主要内容，如果未能解决你的问题，请参考以下文章
验证 HTTP 200 和 500 状态码的 Alamofire 响应