impl1=com.alibaba.dubbo.common.extensionloader.ext5.impl.Ext5Impl1
impl2=com.alibaba.dubbo.common.extensionloader.ext5.impl.Ext5Impl2
wrapper1=com.alibaba.dubbo.common.extensionloader.ext5.impl.Ext5Wrapper1
wrapper2=com.alibaba.dubbo.common.extensionloader.ext5.impl.Ext5Wrapper2