使用log4j2进行公共日志记录 [英] Commons-logging with log4j2

问题描述

我正在使用带有commons-logging的log4j 1.2.现在，我正在尝试将其升级到log4j2. 但是如何在公共记录中使用log4j2来初始化log4j2.

我尝试通过以下方式初始化公共记录.工作正常

**Statement1**: static Log log = new Log4JLogger(Logger.getLogger(Example.class));
**Statement2**:log.debug("debug statement");

这里我正在使用类型为org.apache.log4j.Logger的对象初始化的org.apache.commons.logging.Log类型的对象.(org.apache.log4j.Logger是log4j 1.2中的类，其中从log4j2更改为org.apache.logging.log4j.Logger)

现在，当我升级到log4j2之后， Statement1 将不起作用，因为Log4JLogger()构造函数期望类型为org.apache.log4j.Logger类型的参数.

那么，如何在Log4j2中使用公共日志?

解决方案

您需要将log4j-jcl-2.7依赖项添加到类路径中.

请参阅常见问题解答中的"哪个罐子问题 .

在您的代码中，使用

import org.apache.commons.logging.Log; 
import org.apache.commons.logging.LogFactory; 

public class MyClass {
    private Log log = LogFactory.getLog(MyClass.class);
    ...

您不应明确使用Log4JLogger.

此外，请注意Log4j2与Log4j 1的不同之处在于，它在API和实现之间提供了清晰的分隔.因此，现在使用包装器库的好处比十年前使用Log4j 1的好处要少得多.

考虑直接使用Log4j2 API:它为您提供API与实现之间的相同分离，并且比公共记录或slf4j具有更多的功能.

请注意，直接使用Log4j2 API的风险很小:如果您改变主意并决定对直接使用Log4j2 API的应用程序使用Logback(或其他slf4j实现)，则始终会使用log4j-to-slf4j-2.x模块.

I am using log4j 1.2 with commons-logging. Now I am trying to upgrade it to log4j2. But how to use log4j2 with commons-logging to initialize log4j2.

I tried to initialize commons logging in the below way. Its working fine

**Statement1**: static Log log = new Log4JLogger(Logger.getLogger(Example.class));
**Statement2**:log.debug("debug statement");

Here I am using object of type org.apache.commons.logging.Log initialized with object of org.apache.log4j.Logger.(org.apache.log4j.Logger is the class from log4j 1.2 where as from log4j2 is changed to org.apache.logging.log4j.Logger)

Now after I upgrade to log4j2, Statement1 will not work as Log4JLogger() constructor expects argument of type org.apache.log4j.Logger type.

So, how do I use commons logging with Log4j2?

解决方案

You need to add the log4j-jcl-2.7 dependency to your classpath.

See the "which jars" question in the FAQ.

In your code, use

import org.apache.commons.logging.Log; 
import org.apache.commons.logging.LogFactory; 

public class MyClass {
    private Log log = LogFactory.getLog(MyClass.class);
    ...

You should not explicitly use Log4JLogger.

Also, be aware that Log4j2 is different from Log4j 1 in that it offers a clean separation between its API and its implementation. So the benefits of using a wrapper library are much less now than they were 10 years ago with Log4j 1.

Consider using the Log4j2 API directly: it gives you the same separation between API and implementation and is more feature rich than commons logging or slf4j.

Note that there is little risk in using the Log4j2 API directly: the log4j-to-slf4j-2.x module is always there in case you change your mind and decide to use Logback (or another slf4j implementation) with an application that directly uses the Log4j2 API.

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