有没有办法在运行时确定Java EE版本？ [英] Is there a way to determine the Java EE version at runtime?

问题描述

是否有编程方式来确定哪个版本的java ee环境可用？

Is there programmatic way to determine which version of the java ee environment is available?

推荐答案

没有标准的方法可以做那。你可以做的最接近的是使用reflection / ClassLoader并检查在给定的Java EE版本中引入的特定API类/方法。

There's no standard way to do that. The closest you could do is use reflection/ClassLoader and check for specific API classes/methods that were introduced in a given Java EE version.

我不知道如何：

• Java EE 6 / EJB 3.1添加 javax.ejb.Singleton


• 添加了Java EE 5 / EJB 3.0 javax.ejb.Stateless


• 添加了J2EE 1.4 / EJB 2.1 javax.ejb.TimerService


• 添加了J2EE 1.3 / EJB 2.0 javax.ejb.MessageDrivenBean

• Java EE 6 / EJB 3.1 added javax.ejb.Singleton
• Java EE 5 / EJB 3.0 added javax.ejb.Stateless
• J2EE 1.4 / EJB 2.1 added javax.ejb.TimerService
• J2EE 1.3 / EJB 2.0 added javax.ejb.MessageDrivenBean

在此之前它是J2EE 1.2 / EJB 1.1

Before that it's J2EE 1.2 / EJB 1.1

虽然，请注意，如果这是针对Tomcat（通过标记判断），最好的方法是只检查 System.getProperty（tomcat.version）。您应该能够基于Tomcat版本暗示servlet版本。

Though, note, if this is for Tomcat (judging by the tag), the best way is to just check System.getProperty("tomcat.version"). You should be able to imply the servlet version based on the Tomcat version.

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