Java IDE 中最有用的特性之一就是它们的 debuggers，它可以接入到运行着你的应用的JVM中，允许你在任何位置暂停代码的执行，以便检查应用的状态。
要调试 Play 应用，需要将其以 debug 模式启动，然后把你的 debugger 配置为使用 remote debugging，意味着你的 debugger 将连接到一个已经正在运行的JVM，而不是IDE会启动一个然后连接到这个。
play debug 就能将 Play 以 debug 模式启动。Play 会告诉你 debugger 要连接到哪个端口，默认是 9999.
如果用的是 Eclipse 的 debugger，Run->Debug Configurations->Remote Java Application->创建一个新的远程调试配置。填 localhost 和 9999。要启动调试，请选择 Run > Debug。
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