Question

package common.ejdugedemo;

import org.hibernate.SessionFactory; import org.hibernate.cfg.AnnotationConfiguration;

public class HibernateUtil {

public static SessionFactory buildSessionFactory() throws ExceptionInInitializerError
{
    return new AnnotationConfiguration().configure().buildSessionFactory();
}

}

***************** hibernate.cfg.xml中************************* *

<?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="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/eattorney?characterEncoding=utf8</property>     
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">root</property>
        <property name="show_sql">true</property>
        <property name="hibernate.hbm2ddl.auto">update</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <mapping class="common.hibernate.bean.Admin_answer"/>
        <mapping class="common.hibernate.bean.Admin_question"/>
        <mapping class="common.hibernate.bean.Audit_log"/>
        <mapping class="common.hibernate.bean.Billing"/>
        <mapping class="common.hibernate.bean.Custom_contract_billing_reports"/>
        <mapping class="common.hibernate.bean.Dummyvariable"/>
        <mapping class="common.hibernate.bean.Ejduge_login"/>
        <mapping class="common.hibernate.bean.Entity_registration"/>
        <mapping class="common.hibernate.bean.Gc_percentage"/>
        <mapping class="common.hibernate.bean.Model_contract"/>
        <mapping class="common.hibernate.bean.User_master"/>
        <mapping class="common.hibernate.bean.User_registration"/>
        <mapping class="common.hibernate.bean.Weightage"/>
        <mapping class="common.hibernate.bean.Word_synonym"/>
        <mapping class="common.hibernate.bean.Word_synonym_entity_wise"/>
        <mapping class="common.hibernate.bean.Word_synonym_temp"/>
    </session-factory>
</hibernate-configuration>

***********************构建会话工厂时出现异常****************

java.lang.NullPointerException at org.hibernate.util.StringHelper.qualify（StringHelper.java:264）at at org.hibernate.cfg.OneToOneSecondPass.doSecondPass（OneToOneSecondPass.java:196）在 org.hibernate.cfg.Configuration.secondPassCompile（Configuration.java:1127）在 org.hibernate.cfg.AnnotationConfiguration.secondPassCompile（AnnotationConfiguration.java:296）在 org.hibernate.cfg.Configuration.buildSessionFactory（Configuration.java:1283）在 common.ejdugedemo.HibernateUtil.buildSessionFactory（HibernateUtil.java:10）在org.apache.jsp.login_jsp._jspService（login_jsp.java:92）at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70）at javax.servlet.http.HttpServlet.service（HttpServlet.java:717）at at org.apache.jasper.servlet.JspServletWrapper.service（JspServletWrapper.java:377）在 org.apache.jasper.servlet.JspServlet.serviceJspFile（JspServlet.java:313）在org.apache.jasper.servlet.JspServlet.service（JspServlet.java:260）在javax.servlet.http.HttpServlet.service（HttpServlet.java:717）at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:290）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）在 org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:233）在 org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:191）在 org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:127）在 org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:102）在 org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:109）在 org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:298）在 org.apache.coyote.http11.Http11Processor.process（Http11Processor.java:857）在 org.apache.coyote.http11.Http11Protocol $ Http11ConnectionHandler.process（Http11Protocol.java:588）在 org.apache.tomcat.util.net.JIoEndpoint $ Worker.run（JIoEndpoint.java:489）在java.lang.Thread.run（Thread.java:619）

Answer 1

com.mysql.jdbc.Driver JDBC：MySQL的：//本地主机：3306 / eattorney的characterEncoding = UTF8
根根真正更新 org.hibernate.dialect.MySQLDialect

hibernate中的空指针异常

1 个答案: