java.lang.ClassNotFoundException: javax.persistence.PersistenceException
java.lang.ClassNotFoundException: javax.persistence.PersistenceException
提问于 2018-08-16 02:15:25
我是Hibernate的新手，servlets。我正在尝试从html注册表中使用hibernate将数据存储在mysql数据库中。但是我一直把这个错误作为根本原因。以下是弹出的两个根本原因。
HTTP status 500 Internal server error.
Exception
javax.servlet.ServletException: Servlet execution threw an exception
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Root Cause
java.lang.NoClassDefFoundError: javax/persistence/PersistenceException
java.base/java.lang.ClassLoader.defineClass1(Native Method)
java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1007)
java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174)
org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2339)
org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:829)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1278)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1137)
kish.hibernate.servletController.registerData.doGet(registerData.java:30)
javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Root Cause
java.lang.ClassNotFoundException: javax.persistence.PersistenceException
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1309)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1137)
java.base/java.lang.ClassLoader.defineClass1(Native Method)
java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1007)
java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174)
org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2339)
org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:829)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1278)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1137)
kish.hibernate.servletController.registerData.doGet(registerData.java:30)
javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)这是我的hibernate.cfg.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configurationn>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.cj.jdbc.Driver</property>
<property name="hibernate.connection.password">Kish</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/demo</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
<property name="hbm2ddl.auto">create</property> <!-- create table every time -->
<property name="show_sql">true</property>
<mapping class="kish.hibernate.Pojo.Student"></mapping>
</session-factory>
</hibernate-configurationn>这是我的html文件
<html>
<head>
<title> RegistrationForm</title>
<link rel = "stylesheet" type = "text/css" href = "style1.css">
<body>
<div class= "registrationBox">
<img src= "avatar1.png" class= "avatar">
<h1> enter your details below form</h1>
<form action = "registerData" method ="get">
<p>Firstname</p>
<input type="text" name="first_name" placeholder="Enter your firstname">
<p>Lastname</p>
<input type = "text" name= "last_name" placeholder="Your lastname ">
<p>Branch</p>
<input type = "text" name="branch" placeholder="your branch">
<p>Id</p>
<input type = "text" name = "Id" placeholder="your id">
<p>password</p>
<input type="password" name="password" placeholder="create your password">
<input type="submit" name="submit" value = "confirm">
</form>
</div>
</body>
</head>
</html>servlet文件registerData.java
[package kish.hibernate.servletController;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import kish.hibernate.DAO.MainController;
@WebServlet("/registerData")
public class registerData extends HttpServlet {
private static final long serialVersionUID = 1L;
public registerData() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String first_name = request.getParameter("first_name");
String last_name = request.getParameter("last_name");
String branch = request.getParameter("branch");
int Id = Integer.parseInt(request.getParameter("Id"));
String password = request.getParameter("password");
MainController mc = new MainController();
mc.addUserDeatails(first_name, last_name, branch, Id, password);
response.sendRedirect("success");
}
}我会张贴任何进一步的数据，如果需要。
如有任何建议，欢迎光临。谢谢。
编辑：
"javax.persistence.jar“
它显然包含"javax.persistence.PersistenceException.class“
已添加此jar，但仍显示相同的错误。
回答 2
Stack Overflow用户
发布于 2018-08-16 02:50:45
当JVM试图在运行时动态加载一个类时，就会出现ClassNotFoundException。
NoClassDefFoundError这个有问题的类是在编译时出现的，这就是为什么程序成功编译但在运行时不可用的原因
请检查您的类路径。因为它是maven，所以请检查您的setting.xml中的lib文件夹路径，并检查该jar在m2.pository中是否可用。
Stack Overflow用户
发布于 2018-08-16 05:35:02
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/51864229
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