学步园

 java.lang.NoClassDefFoundError: org/slf4j/helpers/NOPLoggerFactory

原因是

slf4j-api-1.5.8
slf4j-nop-1.6.0

两个包不兼容造成的

下载最新的slf4j包

问题解决

统一使用

slf4j-api-1.6.3

下载地址

http://download.csdn.net/detail/ocean20/3695075

测试用类使用前加如junit-4.8.2.jar

package junit.test;

import javax.persistence.EntityManager;

import javax.persistence.EntityManagerFactory;

import javax.persistence.Persistence;

import org.junit.BeforeClass;

import org.junit.Test;

import com.itcast.bean.product.ProductType;

public class ProductTest {

    @BeforeClass

    public static void setUpBeforeClass()
throws Exception {

    }

    /*

     * 添加单元测试点

     * (@Test) public void runtest()启动JPA框架

     */

    @Test

    public void runtest(){

       //(Persistence.createEntityManagerFactory(“实体bean集合名”); 由JPA规范，作为启动JPA框架的入口点)

       EntityManagerFactory factory = Persistence.createEntityManagerFactory("itcast");

       EntityManager em =factory.createEntityManager();

       em.getTransaction().begin();

       em.persist(new ProductType());

       em.getTransaction().commit();

       em.close();

       factory.close();

    }

}