java - 非静态日志能说得过去吗？

Question

我是使用 Apache 公共(public)日志记录完成日志记录的代码库的唯一维护者。

所有类都包含这两个导入:

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

然后很多类都包含这样的非静态日志实例化:

/** The log. */
private Log log = LogFactory.getLog(Xyz.class);

这有道理吗？

我可以安全地将所有这些更改为静态调用吗？

编辑 关于它(显然)可以派上用场的特殊情况:我的问题确实更多“整个代码库中的非静态日志是否合理？”

Answer 1

这取决于。这是来自 documentation :

Note that for application code, declaring the log member as "static" is more efficient as one Log object is created per class, and is recommended. However this is not safe to do for a class which may be deployed via a "shared" classloader in a servlet or j2ee container or similar environment. If the class may end up invoked with different thread-context-classloader values set then the member must not be declared static. The use of "static" should therefore be avoided in code within any "library" type project.