我编写了一些代码来学习休眠。它在下面抛出错误。我如何找出问题所在并解决它？dom4j 听起来像是一个 XML 问题。hibernate.cfg.xml 有问题吗？
Exception in thread "main" java.lang.NoClassDefFoundError: org/dom4j/DocumentException
at com.examscam.model.User.persist(User.java:45)
at com.examscam.model.User.main(User.java:57)
Caused by: java.lang.ClassNotFoundException: org.dom4j.DocumentException
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 2 more
（为什么eclipse没有显示这个“2more”的东西？）
代码 -
package com.examscam.model;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
@Entity
public class User {
private Long id;
private String password;
@Id
@GeneratedValue
public Long getId(){
return id;
}
public void setId(Long id){
Class c1 = User.class;
this.id = id;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public static void persist(){
/*
* Contains all the info needed to connect to database, along with
* info from your JPA annotated class, ie this class.
*/
AnnotationConfiguration config = new AnnotationConfiguration();
config.addAnnotatedClass(User.class);
config.configure();
SchemaExport schemaExport = new SchemaExport(config);
schemaExport.create(true, true);
}
public static void main(String[]args){
persist();
}
}
XML 文件 -
<?xml version = '1.0' encoding='UTF-8' ?>
<!Doctype hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name = "connection.url">
jdbc:mysql://localhost/examscam
</property>
<property name = "connection.username">
root
</property>
<property name = "connection.password">
password
</property>
<property name = "connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name = "dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name = "transaction.factory_class">
org.hibernate.transaction.JDBCTransactionFactory
</property>
<property name = "current_session_context_class">
thread
</property>
<!-- this will show us all the SQL statements-->
<property name = "hibernate.show_sql">
true
</property>
<!-- We dont use any mapping files as of now-->
</session-factory>
</hibernate-configuration>
更新
修复上述错误后，又出现了一个新问题——
我正在用 Eclipse 编写代码。我添加了代码所需的所有可能的 jar，但我的代码仍然无法正常工作。为什么当我已经将 sl4fj ( slf4j-api-1.5.8.jar) 添加到构建路径时出现此错误java.lang.ClassNotFoundException: org.slf4j.impl.StaticLoggerBinder ？
错误 -
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j
/impl/StaticLoggerBinder
at org.slf4j.LoggerFactory.getSingleton(LoggerFactory.java:223)
at org.slf4j.LoggerFactory.bind(LoggerFactory.java:120)
at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:111)
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:269)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:242)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:255)
at org.hibernate.cfg.Configuration.<clinit>(Configuration.java:152)
at com.examscam.model.User.persist(User.java:45)
at com.examscam.model.User.main(User.java:57)
Caused by: java.lang.ClassNotFoundException: org.slf4j.impl.StaticLoggerBinder
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 9 more