Spring MVC+Hibernate JPA搭建的博客系统项目中所遇到的坑
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项目代码地址：https://github.com/zhisheng17/springmvc
如果觉得不错的话，欢迎给个 star ， 如果你想完善这个项目的话，你也可以 fork 后修改然后推送给我。
最近在学习 Spring MVC ，其中在做一个简单的博客系统demo，是使用 SpringMVC 集成
Spring Data JPA（由 Hibernate JPA 提供），来进行强大的数据库访问。结果其中遇到的坑不
是一点点啊，我差点崩溃了，其中最大的原因就是由于 Hibernate JPA 中的bug了，反正一开始
还不知道是这个问题，导致折腾了快一天的时间。想想都可怕啊。
mvc-dispatch-servlet.xml代码
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<!--指明 controller 所在包，并扫描其中的注解-->
<context:component-scan base-package="cn.zhisheng.controller"/>
<!-- 静态资源(js、image等)的访问 -->
<mvc:default-servlet-handler/>
<!-- 开启注解 -->
<mvc:annotation-driven/>
<!--ViewResolver 视图解析器-->
<!--用于支持Servlet、JSP视图解析-->
<bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/pages/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!-- 表示JPA Repository所在的包 -->
<jpa:repositories base-package="cn.zhisheng.repository"/>
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitName" value="defaultPersistenceUnit"/>
<property name="packagesToScan" value="cn.zhisheng.model" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
</property>
<property name="jpaProperties">
<props>
<prop key="hibernate.connection.driver_class">com.mysql.jdbc.Driver</prop>
<prop key="hibernate.connection.url">jdbc:mysql://localhost:3306/springdemo?useSSL=false</prop>
<prop key="hibernate.connection.username">root</prop>
<prop key="hibernate.connection.password">root</prop>
<prop key="hibernate.show_sql">false</prop>
<prop key="hibernate.connection.useUnicode">true</prop>
<prop key="hibernate.connection.characterEncoding">UTF-8</prop>
<prop key="hibernate.format_sql">true</prop>
<prop key="hibernate.use_sql_comments">true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
<prop key="hibernate.connection.autoReconnect">true</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
<prop key="connection.autoReconnectForPools">true</prop>
<prop key="connection.is-connection-validation-required">true</prop>
<prop key="hibernate.c3p0.validate">true</prop>
<prop key="hibernate.connection.provider_class">org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider</prop>
<prop key="hibernate.c3p0.min_size">5</prop>
<prop key="hibernate.c3p0.max_size">600</prop>
<prop key="hibernate.c3p0.timeout">1800</prop>
<prop key="hibernate.c3p0.max_statements">50</prop>
<prop key="hibernate.c3p0.preferredTestQuery">SELECT 1;</prop>
<prop key="hibernate.c3p0.testConnectionOnCheckout">true</prop>
<prop key="hibernate.c3p0.idle_test_period">3000</prop>
<prop key="javax.persistence.validation.mode">none</prop>
</props>