ejb-jar.xml文档包含额外的配置信息，这些信息能重载或者增补EJB3 bean上的注解。
The ejb-jar.xml file contains extra configurations that can override or supplement the annotations on EJB3 beans.
通常情况下，重部署过程可以从ide中触发(比如说，当用户保持一个文件时)，这样的话，无需用户任何额外的干涉就可以做到重载应用了。
Often the redeployment can be triggered from the IDE (e.g. when the user saves a file) thus reloading the application without any additional user involvement.
根据过程的特性，您会发现定义所有重载版本的额外努力是十分值得的。
Depending on the nature of the procedure, you might find that the clarity of logic justifies the extra effort of defining all the overloaded versions.
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