解决dubbo-2.5.4在contos 系统jdk1.8环境下部署报错的问题

部署dubbo-admin的时候报错

ERROR context.ContextLoader - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'uriBrokerService': Cannot create inner bean '(inner bean)' of type [com.alibaba.citrus.service.uribroker.impl.URIBrokerServiceImpl$URIBrokerInfo] while setting bean property 'brokers' with key [0]; nested excepti
on is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#25': Cannot create inner bean 'server' of type [com.alibaba.citrus.service.uribroker.uri.GenericURIBroker] while setting constructor argument; nested exception is org.springframework.beans.fact
ory.BeanCreationException: Error creating bean with name 'server': Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'URIType' of bean class [com.alibaba.citrus.service.uribroker.uri.GenericURIBroker]: Bean property 'URIType'
is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
        at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:230)
        at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:122)
        at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveManagedList(BeanDefinitionValueResolver.java:287)

查看源码如下：

set方法不很标准，导致高版本jdk（jre）不能支持，导致报错。

解决方法：

1、更换服务器jdk版本。

2、修改dubbo-admin tomcat默认jdk版本。

3、修改dubbo-admin项目依赖（dependency）从新打包。

 主要说下第三种方法：

https://github.com/apache/dubbo/releases/tag/dubbo-2.5.4

下载完解压后：在目录dubbo-dubbo-2.5.4\dubbo-admin打开pom.xml文件

1、修改webx的依赖改为3.1.6版（版本号在dubbo-dubbo-2.5.4\pom.xml中名字叫 3.1.6）

2、添加velocity的依赖，我用了1.7

3、对依赖项dubbo添加exclusion，避免引入旧spring

 4、打包部署后发现报错缺失applicationContext.xml文件这是因为spring默认版本太高导致在dubbo-dubbo-2.5.4\pom.xml中修改spring_version版本为3.2.9

 5、打war包部署完成。