在java工程中使用hibernate.cfg.xml文件和User.hbm.xml文件，測試運行沒有問題，可以寫入到數據庫表中，但是在web工程中，使用hibernate就報錯，運行提示：
java.lang.NoSuchMethodError: org.hibernate.internal.CoreMessageLogger.debugf(Ljava/lang/String;I)V at org.hibernate.engine.jdbc.connections.internal.PooledConnections.<init>(PooledConnections.java:34) at org.hibernate.engine.jdbc.connections.internal.Po
1、調整了jar包的配置，也不行。
2、還提示HttpServletRequest無法識別。
3、關閉工程，刪除了web-inf/lib下jsr 303中關於hibernate驗證框架的jar包。然後重新引用servlet api的jar包，運行成功。
MyEclipse中出現“HttpServletRequest cannot be resolved to a type”的錯誤
2014年03月02日 13:13:45 hpyon 閱讀數：5126
出現這種問題主要是項目中少了servlet包，全名爲servlet-api.jar，這個包是可以在tomcat中找到的，所以
1.右擊項目，單擊Build Path
2.選中add external archives，找到安裝放tomcat的文件夾，
並且找到其中的lib文件夾，servlet-api.jar就在裏面，選中確認就可以啦
估計是jsr303中的hibernate驗證框架與引用的myeclipse自帶的hibernate 5.1的包衝突造成。
package com.jxq.test;
import org.hibernate.Session;
import org.junit.Test;
import com.jxq.common.HibernateUtils;
import com.jxq.model.User;
public class test01 {
@Test //使用junit 將該方法當做java工程運行
public void aa(){
System.out.println("jalsdjflajsdfl;a");
Session ss=null;
try {
ss=HibernateUtils.openSession();
ss.beginTransaction();
User u=new User();
u.setUsername("ljlj");
u.setUserpass("123");
u.setNickname("撿垃圾");
u.setEmail("[email protected]");
ss.save(u);
ss.getTransaction().commit();
} catch (Exception e) {
e.printStackTrace();
ss.getTransaction().rollback();
}finally{
if(ss!=null) ss.close();
}
}
}
package com.jxq.common;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.cfgxml.spi.CfgXmlAccessService;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
/**
* Configures and provides access to Hibernate sessions, tied to the
* current thread of execution. Follows the Thread Local Session
* pattern, see {@link http://hibernate.org/42.html }.
*/
public class HibernateUtils {
/**
* Location of hibernate.cfg.xml file.
* Location should be on the classpath as Hibernate uses
* #resourceAsStream style lookup for its configuration file.
* The default classpath location of the hibernate config file is
* in the default package. Use #setConfigFile() to update
* the location of the configuration file for the current session.
*/
private final static SessionFactory sf=buildSessionFactory();
private static SessionFactory buildSessionFactory() {
System.out.println("create hibernate factory...............");
try {
/* //hibernate 4.3之前用這種方式創建sessionfactory, 未進行實際驗證，好像沒有StandardServiceRegistryBuilder對象
Configuration cfg=new Configuration().configure("/hibernate.cfg.xml");
System.out.println("create hibernate factory 111 ...............");
ServiceRegistry svr = new StandardServiceRegistryBuilder().applySettings(cfg.getProperties()).build();
System.out.println("create hibernate factory 2222 ...............");
SessionFactory factory=cfg.buildSessionFactory(svr);
System.out.println("create hibernate factory success ...............");
return factory;*/
//4.3之後，用這種方式創建sessionfactory，否則用上面的方式創建，運行時也能創建成功，但是保存時候會提示org.hibernate.MappingException: Unknown entity: com.jxq.model.User
return new Configuration().configure().buildSessionFactory();
} catch (Exception e) {
System.out.println("%%%% Error Creating SessionFactory %%%%");
e.printStackTrace();
}
return null;
}
public static Session openSession(){
return sf.openSession();
}
public static void closeSession(Session session) throws HibernateException {
if (session != null) session.close();
}
}
hibernate jar包用5.1版本的，但是創建sessionfactory用4.3之前的，也能提示創建成功，但是調用save方法的時候，提示找不到實體類。如下圖。
package com.jxq.model;
import org.hibernate.validator.constraints.Email;
import org.hibernate.validator.constraints.Length;
import org.hibernate.validator.constraints.NotEmpty;
import com.sun.xml.internal.bind.v2.model.core.ID;
public class User {
private int id; //忘記該屬性了，報mapping 錯誤，Unknown entity:
//@NotEmpty(message="用戶名不能爲空") 測試時，暫時註釋掉
private String username;
//@Length(min=6,message="密碼不低於6位")
private String userpass;
private String nickname;
//@Email(message="郵箱格式不正確")
private String email;
public User() {
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUserpass() {
return userpass;
}
public void setUserpass(String userpass) {
this.userpass = userpass;
}
public String getNickname() {
return nickname;
}
public void setNickname(String nickname) {
this.nickname = nickname;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public User(String username, String userpass, String nickname, String email) {
super();
this.username = username;
this.userpass = userpass;
this.nickname = nickname;
this.email = email;
}
}
User.hbm.xml
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-mapping package="com.jxq.model">
<class name="User" table="t_user">
<id name="id" column="id">
<generator class="native"></generator>
</id>
<property name="username" />
<property name="userpass" />
<property name="nickname" />
<property name="email" />
</class>
</hibernate-mapping>
hibernate.cfg.xml
<?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">
<!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/myhib</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password"></property>
<property name="hbm2ddl.auto">update</property>
<property name="show_sql">true</property>
<mapping resource="com/jxq/model/User.hbm.xml" />
</session-factory>
</hibernate-configuration>
運行成功結果圖。
