知也atitit.解决struts2 SpringObjectFactory.getClassInstance NullPointerException  v2 q31无涯 - I

atitit.解决struts2 SpringObjectFactory.getClassInstance NullPointerException v2 q31

1. #--现象 java.lang.NullPointerException1

2. #----原因1

3. #---别的原因1

4. Spring的加载机制1

5. 参考2

1. #--现象 java.lang.NullPointerException

at com.opensymphony.xwork2.spring.SpringObjectFactory.getClassInstance

com.opensymphony.xwork2.spring.SpringObjectFactory nullpointexcept.txt

九千一满好直了,猛个腊擦走不行兰.

作者 老哇的爪子 Attilax 艾龙， EMAIL:1466519819@qq.com

转载请注明来源： http://blog.csdn.net/attilax

2. #----原因

maybe hb err...so .spr error .so ket...rej to ekshen...

can run sprutil...test

3. #---别的原因

1.原因是加多了一个包(jar冲突)，把这个包删除就可以了

struts2-spring-plugin-2.0.11.jar

2.短了struts2-spring-plugin-2.0.11.jar

3.webxml 没配置spring action的listen

4. Spring的加载机制

<!-- 加载数据库中所有公用数据到缓存中 -->

<listener>

<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

</listener>

<context-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:applicationContext.xml</param-value>

</context-param>

SpringObjectFactory.getClassInstance 是从classloader黑头load class的..

public Class getClassInstance(String className)

throws ClassNotFoundException {

Class clazz = null;

if (this.useClassCache) {

synchronized (this.classes) {

clazz = (Class) this.classes.get(className);

}

}

if (clazz == null) {

if (this.appContext.containsBean(className))

clazz = this.appContext.getBean(className).getClass();

else {

clazz = super.getClassInstance(className);

}

if (this.useClassCache) {

synchronized (this.classes) {

this.classes.put(className, clazz);

}

}

}

return clazz;

}

5. 参考

tomcat6启动出现的错误 Exception starting filter struts com.opensymphony.xwork2.spring.SpringObjectFactory.getClassInstance - Chark-程序员BOLG - 博客频道 - CSDN.NET.htm

struts2启动报错com opensymphony xwork2 spring SpringObjectFactory.java 220 -1 - 吾生也有涯，而知也无涯 - ITeye技术网站.htm