JavaWEB开发中的部分常见异常

[java]

1、nested exception is java.lang.OutOfMemoryError: Java heap space&＃xff1a;list

[hibernate]

1、should be mapped with insert&＃61;"false" update&＃61;"false"&＃xff1a;存在重复映射的字段&＃xff1b;

2、Caused by: org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]&＃xff1a;

配置文件与实体文件映射错误&＃xff0c;多了字段或少了字段或少些了getter 方法&＃xff1b;

3、org.hibernate.LazyInitializationException: could not initialize proxy - no Session&＃xff1a;映射关系中加上 lazy&＃61;"false"&＃xff1b;

4、org.hibernate.ObjectNotFoundException: No row with the given identifier exists&＃xff1a;根据外键id查询不到映射表的相应数据&＃xff1b;

5、Could not determine type for: String, for columns: [org.hibernate.mapping.Column(XXX)]&＃xff1a;type指的是*.hbm.xml配置文件中的类型&＃xff0c;string要小写&＃xff1b;

6、nested exception is org.hibernate.ObjectNotFoundException: No row with the given identifier exists&＃xff1a;映射表中数据的主键id不匹配&＃xff1b;

7、org.hibernate.PropertyAccessException: IllegalArgumentException occurred while calling setter of XXX&＃xff1a;配置文件与实体类字段类型不一致&＃xff1b;

8、org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1&＃xff1a;级联新增&＃xff0c;打印出来的sql语句显示主表为insert&＃xff0c;从表为update  可以将配置文件中自增id设置 unsaved-value&＃61;"0"&＃xff1b;

9、ConstraintViolationException: Could not execute JDBC batch update&＃xff1a;两个表建立了外键约束&＃xff0c;删除约束后操作成功&＃xff1b;

10、 nested exception is org.springframework.beans.NotWritablePropertyException&＃xff1a;

11、org.springframework.beans.factory.BeanCreationException:Spring中的“asm-2.2.3.jar”和Hibernate中的“asm.jar”包冲突。解决办法是移除Spring2.0 AOP Libraries中的“asm-2.2.3.jar”即可

12、org.springframework.beans.MethodInvocationException: 在classes目录有一个以前的类&＃xff0c;但现在的类的路径已经发生了变化&＃xff0c;发生变化的类全部封装在 jar 里面&＃xff0c;但class loader 是优先装载 classes 目录下的类&＃xff0c;所以存在装载时发生“NoClassDefFoundError”错误&＃xff01;只要把classes下的class文件删除即可。

13、com.sun.faces.mgbean.ManagedBeanCreationException&＃xff1a;数据问题

14、a different object with the same identifier value was already associated with the session&＃xff1a;getHibernateTemplate().merge(object);http://chenying.blog.51cto.com/614874/134702

15、MySQLSyntaxErrorException: SELECT command denied to user &＃39;XXX&＃39;&＃64;&＃39;XXX.XXX.XXX.XXX&＃39; for table &＃39;XXX&＃39;&＃xff1a;http://ganhaitian.blog.sohu.com/198205957.html

[spring]

1、org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Failed to import bean definitions from relative location [classes/config/spring/beans/DataSource.xml]&＃xff1a;路径不对

2、spring未注入引起的NullPointException

ApplicationContext context &＃61; new ClassPathXmlApplicationContext("applicationContext.xml");　　　　　//source目录&＃xff08;一般是在src目录下&＃xff09; 第一种获取配置文件的方式//ApplicationContext context &＃61; new FileSystemXmlApplicationContext("D:\\applicationContext.xml");　//绝对路径　　第二种获取配置文件的方式

 IDao dao &＃61; (Dao)context.getBean("dao");　　//获取bean
 //dao.add(obj);//正常调用方法

路径问题

3、 java.lang.IllegalArgumentException: &＃39;sessionFactory&＃39; or &＃39;hibernateTemplate&＃39; is required&＃xff1a;配置文件未配置sessionFactory

4、com.sun.faces.mgbean.ManagedBeanCreationException: 无法设置受管 bean buildingBean 的属性 buildingBo&＃xff1a;实体类和配置文件映射错误

5、启动 org.springframework.beans.factory.BeanCreationException&＃xff1a;asm.jar包冲突

6、

[MySql]

1、mysql 内存表 #1114: The table is full  

修改tmp_table_size&＃xff08;set tmp_table_size&＃61;314572800;&＃xff09;&＃xff1b;

修改max_heap_table_size&＃xff08;Set max_heap_table_size&＃61;314572800;&＃xff09;&＃xff1b;

查询命令&＃xff1a; show variables like &＃39;%tmp_table_size%&＃39;; show variables like &＃39;%max_heap_table_size%&＃39;;

2、Warning: World-writable config file &＃39;/etc/my.cnf&＃39; is ignored&＃xff1a;http://blog.sina.com.cn/s/blog_71261a2d0100yjj1.html

3、mysql Starting MySQL..The server quit without updating PID file&＃xff1a;http://www.phpufo.com/?p&＃61;560

4、Can&＃39;t start server: Bind on TCP/IP port: Permission denied  Do you already have another mysqld server running on port: 3308http://blog.csdn.net/daodan988/article/details/8378893

5、mysqldump备份数据库时出现when using LOCK TABLEShttp://hi.baidu.com/ttianmy/item/236ec32161c8bc9ab6326377

[tomcat]

1、IOException while loading persisted sessions: java.io.EOFException&＃xff1a;清理一下tomcat的work目录

[primefaces][jsf]

1、javax.faces.FacesException: Cannot find component "xxx" in view.&＃xff1a;jsf调不到html页面中"xxx"这个id。

2、javax.el.PropertyNotFoundException: Property &＃39;name&＃39; not found on type java.lang.String&＃xff1a;使用标签

3、com.sun.faces.config.ConfigManager initialize  

• 信息: Unsanitized stacktrace from failed start...

http://feuyeux.iteye.com/blog/751439

4、viewExpiredException 无法恢复视图http://wenku.baidu.com/view/cf325dd433d4b14e852468c5.html

[dwr]

1、session error &＃xff1a;web.xml需要配置 http://nshg.iteye.com/blog/1513181

?

code

faces-config.xml&＃xff1a;

sceneConvertercn.ac.sim.ilec.utils.SceneConverter


SceneConverter.java&＃xff1a;

import javax.faces.component.UIComponent;import javax.faces.context.FacesContext;

import javax.faces.convert.Converter;import cn.ac.sim.ilec.model.Scene;

/** *&＃64;description Scene是一个实体类 */

publicclass SceneConverter  implements Converter {    

&＃64;Override    

public Object getAsObject(FacesContext context, UIComponent component, String value) {        

Scene scene &＃61;new Scene();        

scene.setId(Integer.parseInt(value));        

return scene;  

}    

&＃64;Override    

public String getAsString(FacesContext context, UIComponent component, Object value) {        

return String.valueOf(((Scene) value).getId());  

}

}

xhtml&＃xff1a;

converter&＃61;"sceneConverter" var&＃61;"scene"                                    

itemLabel&＃61;"#{scene.name}" itemValue&＃61;"#{scene}" showSourceControls&＃61;"true" showTargetControls&＃61;"true"                                showSourceFilter&＃61;"true" showTargetFilter&＃61;"true" filterMatchMode&＃61;"contains" />