将Logger.info放在静态块中 [英] Putting Logger.info in static block

问题描述

我有以下课程

public class MyClass
{
    private static final Logger logger = Logger.getLogger(MyClass.class);

    static
    {
        logger.info("some text");
    }
}

可以安全地假设到我们到达logger.info时，log4j系统已初始化并准备发出日志了吗?

Is it safe to assume that by the time we reach logger.info, the log4j system is initialized and is ready to emit logs?

看来，如果我能够执行Logger.getLogger()并取回有效的Logger实例，则意味着Log4j已初始化，对吧?

It seems that if I am able to do a Logger.getLogger() and get back a valid Logger instance, it means that Log4j is initialized, right?

推荐答案

是的.静态初始化程序(即static {}块和对静态变量的初始分配)均按声明的顺序执行.

Yes, it is. Static initializers (that is, both static {} blocks and initial assignments to static variables) are executed in the order they are declared.

log4j的默认初始化依赖于log4j类LogManager中的静态块，该静态块在Logger类被加载并且在首次使用之前被加载时执行.这就是为什么您的构造起作用的原因.

Default initialization of log4j relies on a static block in a log4j class LogManager that is executed once Logger class is loaded, and it is loaded prior to its first use. This is why your construction works.

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