因为一直报实体类空异常,去网上查了资料只查到了并没有查到数据库空值时不给实体类赋值的属性
异常
org.hibernate.InvalidMappingException: Could not parse mapping document from resource cn/pojo/EmpDao.xml at org.hibernate.cfg.Configuration.addResource(Configuration.java:616) at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1635) at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1603) at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1582) at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1556) at org.hibernate.cfg.Configuration.configure(Configuration.java:1476) at org.hibernate.cfg.Configuration.configure(Configuration.java:1462) at cn.tool.HibernateUtil.<clinit>(HibernateUtil.java:16) at cn.service.EmpService.findEmpById(EmpService.java:16) at cn.Test.main(Test.java:9) Caused by: org.hibernate.InvalidMappingException: Could not parse mapping document from input stream at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:555) at org.hibernate.cfg.Configuration.addResource(Configuration.java:613) ... 9 more Caused by: org.dom4j.DocumentException: Connection reset Nested exception: Connection reset at org.dom4j.io.SAXReader.read(SAXReader.java:484) at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:546) ... 10 more Exception in thread "main" java.lang.NullPointerException at cn.tool.HibernateUtil.currentSession(HibernateUtil.java:29) at cn.service.EmpService.findEmpById(EmpService.java:16) at cn.Test.main(Test.java:9)
于是就加了这段代码
public void setComm(Object comm) { if(comm!=null) this.comm = (double)comm; }