Selenium 许多日志(如何删除) [英] Selenium many Logs (How to remove)

问题描述

我在 Firefox 48 上尝试了 Selenium 3.0.1.

I tried the Selenium 3.0.1 with Firefox 48.

而且我已经尝试了以下代码:

And I already tried the following code:

java.util.logging.Logger.getLogger("com.gargoylesoftware.htmlunit").setLevel(Level.OFF);java.util.logging.Logger.getLogger("org.apache.commons.httpclient").setLevel(Level.OFF);java.util.logging.Logger.getLogger(ProtocolHandshake.class.getName()).setLevel(Level.OFF);

java.util.logging.Logger.getLogger("com.gargoylesoftware.htmlunit").setLevel(Level.OFF); java.util.logging.Logger.getLogger("org.apache.commons.httpclient").setLevel(Level.OFF); java.util.logging.Logger.getLogger(ProtocolHandshake.class.getName()).setLevel(Level.OFF);

但是一旦我在 Netbeans 下运行通常的测试，...日志仍然出来:

but once i run the usual testing under Netbeans,... the logs still comes out:

Dec 02, 2016 9:17:53 AM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Attempting bi-dialect session, assuming Postel's Law holds true on the remote end
Dec 02, 2016 9:17:57 AM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: OSS

有解决这个问题的线索吗?

Any clue for solving this?

推荐答案

您必须将记录器固定在内存中或设置 logging.properties 配置文件.来自 java.util.logging.Logger 文档:

You have to pin your loggers in memory or setup a logging.properties config file. From the java.util.logging.Logger docs:

Logger 对象可以通过调用 getLogger 工厂方法之一来获得.这些将创建一个新的 Logger 或返回一个合适的现有 Logger.需要注意的是，如果没有保留对 Logger 的强引用，由 getLogger 工厂方法之一返回的 Logger 可能会随时被垃圾回收.

Logger objects may be obtained by calls on one of the getLogger factory methods. These will either create a new Logger or return a suitable existing Logger. It is important to note that the Logger returned by one of the getLogger factory methods may be garbage collected at any time if a strong reference to the Logger is not kept.

当返回一个新的记录器时，日志级别由 LogManager 确定，它默认使用 logging.properties 文件中的设置.在您的示例中，可以看到以下内容:

When a new logger is returned the log level is determined by the LogManager which by default uses settings from a logging.properties file. In your example, it is possible to see the following:

1. 调用 getLogger 会创建一个新的记录器并从 LogManager 设置级别.
2. 您的代码将记录器级别设置为关闭.
3. G.C.运行并销毁您的记录器以及您刚刚应用的设置.
4. Selenium 调用 getLogger 并创建一个新的记录器并从 LogManager 设置级别.

这里有一个示例测试用例来证明这一点:

Here is an example test case to prove the point:

    public static void main(String[] args) {
        String name = "com.gargoylesoftware.htmlunit";
        for (int i = 0; i < 5; i++) {
            System.out.println(Logger.getLogger(name).getLevel());
            Logger.getLogger(name).setLevel(Level.OFF);
            System.runFinalization();
            System.gc();
            System.runFinalization();
            Thread.yield();
        }
    }

哪个将输出 null 而不是 OFF.

Which will output null instead of OFF.

如果你通过持有强引用来固定你的记录器，那么第 3 步永远不会发生，而 Selenium 应该找到你创建的级别设置为 OFF 的记录器.

If you pin your logger by holding a strong reference then step #3 never happens and Selenium should instead find the logger you created which has the level set to OFF.

private static final Logger[] pin;
static {
    pin = new Logger[]{
        Logger.getLogger("com.gargoylesoftware.htmlunit"),
        Logger.getLogger("org.apache.commons.httpclient"),
        Logger.getLogger("org.openqa.selenium.remote.ProtocolHandshake")
    };

    for (Logger l : pin) {
        l.setLevel(Level.OFF);
    }
}

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