開發常見異常
常見異常總結：
問題：IllegalAgumentExecption
問題：內存溢出異常
這個一般報【http-8080-3】之類的
1.在eclipse安裝目錄中將eclipse的啟動參數調大一些：
-startup plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar --launcher.library plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.300.v20150602-1417 -product org.eclipse.epp.package.jee.product --launcher.defaultAction openFile --launcher.XXMaxPermSize 512M -showsplash org.eclipse.platform --launcher.XXMaxPermSize 512m --launcher.defaultAction openFile --launcher.appendVmargs -vmargs -Dosgi.requiredJavaVersion=1.7 -Xms512m -Xmx1024m |
問題：BeanDefinitionParsingException
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Failed to import bean definitions from URL location [classpath:applicationContext-service.xml]
原因：applicationContext-service.xml沒有加進去總的spring配置文件，或者名字寫錯，或者配置文件內部程序錯誤。
問題：There is no Action mapped for namespace
There is no Action mapped for namespace [/sysadmin] and action name [deptAction_list] associated with context path [/qb_web]. - [unknown location]
原因：struts.xml文件不在src下，或者編譯後不在classes下；
或者struts.xml配置文件內部錯誤；
或者有其他的struts-xxx.xml沒有include到struts.xml中；
或者action與spring整合的時候出錯，一些UserServie沒有在struts配置文件中，或者寫錯，導致找不見struts.xml；
或者請求路徑出錯。
問題：action本身就在值棧中，但action不在值棧的棧頂；
問題：classpath
Classpath只能用在spring中，
問題：重定向和轉發
問題：hibernate子配置文件Dept.hbm.xml問題
<property name="name" column="NAME"></property>
01.name屬性出錯
報錯：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘sessionFactory‘ defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is Caused by: org.hibernate.property.access.spi.PropertyAccessBuildingException: Could not locate field nor getter method for property named [com.my.qb.domain.Userinfo#ne] |
02.column屬性出錯
不會報錯，但是加載運行的時候不行，這個要特別註意。
03.package出錯
<hibernate-mapping package="com.my.qb.domain">
報錯：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘sessionFactory‘ defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is org.hibernate.MappingException: class cn.itcast.jk.domain.Dept not found while looking for property: id
Caused by: org.hibernate.MappingException: class cn.itcast.jk.domain.Dept not found while looking for property: id
Caused by: org.hibernate.boot.registry.classloading.spi.ClassLoadingException: Unable to load class [cn.itcast.jk.domain.Dept] Caused by: java.lang.ClassNotFoundException: Could not load requested class : cn.other.jk.domain.Dept |
問題:數據庫屬性設為非空，但是沒有賦值
Struts Problem Report
Struts has detected an unhandled exception:
Messages: ORA-01400: ??? NULL ?? ("ITQB"."USER_P"."CREATE_TIME")
could not execute statement
could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement
File: oracle/jdbc/driver/DatabaseError.java
Line number: 112
java.sql.SQLException: ORA-01400: ??? NULL ?? ("ITQB"."USER_P"."CREATE_TIME")
問題：
新建jsp頁面老提示： Multiple annotations found at this line: - The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path 解決步驟： 1、右鍵項目-build path 2、選擇configure build path... 3、選擇 Javabuild path 4、Add Library –> server Runtime -> Click Next 5、選擇 Server runtime (我的是 Tomcat 7.0) –>完成 |
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開發常見異常