在 Eclipse 4 (RCP/SWT/OSGi) 应用程序中包含 log4j 的正确方法 [英] Proper way to include log4j in an Eclipse 4 (RCP/SWT/OSGi) application

问题描述

这是一个后续(不知何故我的 第三方对 OSGi 应用程序的依赖项) 建议一些库，例如log4j已经可以作为包使用了.
在 Eclipse Indigo 中，我在安装过程中找不到可用于 Import Package 的 log4j 包，因此我创建了一个 Plugin Project from JAR archive 来捆绑 log4j 和一个 Feature Project 在 发布.

This is a follow-up (somehow of my Third-party dependencies to an OSGi application) where it was suggested that some libraries e.g. log4j are already available as bundles.
In Eclipse Indigo I could not find a log4j bundle available to Import Package as part of my installation and so I created a Plugin Project from JAR archive to bundle log4j and also a Feature Project to bundle the log4j.xml configuration following this post.

说实话，我不明白为什么需要片段项目，但这个过程有效.
所以我现在的问题是:
由于 log4j.xml 作为功能 jar 的一部分在导出中交付，因此需要一些努力"才能找到它并更新调试级别，所以我想知道这确实是正确的过程?
我记得最终导出的产品会在一个容易找到的位置提供 log4j 配置，但现在(尽管日志记录有效)我担心我所做的是否确实正确.

To be honest I don't understand why the fragment project is needed but this process works.
So my question now is:
Since the log4j.xml is delivered in the export as part of the feature jar, it requires some "effort" for someone to find it and update the debug levels, so I was wondering is this indeed the correct process?
I had in mind that the final exported product would deliver the log4j configuration in an easy to find location, but now (although the logging works) I am concerned whether what I do, is indeed correct.

这里有什么帮助吗?

推荐答案

如果你真的需要暴露文件，你可以把它放在你想要的任何地方，然后确保你的程序在启动时调用这些方法之一:

If you really need to expose the file, you could put it anywhere you want, and then make sure your program calls one of these methods at startup:

• org.apache.log4j.xml.DOMConfigurator.配置(字符串文件名)
• org.apache.log4j.PropertyConfigurator.配置(String配置文件名)

• org.apache.log4j.xml.DOMConfigurator.configure(String filename)
• org.apache.log4j.PropertyConfigurator.configure(String configFilename)

如果您想在不重新启动应用程序的情况下更改配置，请使用configureAndWatch"变体.

Or use the "configureAndWatch"-variants if you would like to make changes to the config without restarting your application.

编辑:我写如果你真的需要的话"，因为我经历过部署后我永远不需要打开调试日志，因为它总是打开的！这对于我对响应时间和吞吐量有正常(但不是极端)要求的应用程序来说是可以的.记录到 UDP-appender 很快(并且不会填满磁盘).或者使用滚动文件附加程序是非常安全的，并且足够快以供我使用.在确定那些难以重现的错误时，始终提供可用的调试日志是一种救命稻草.

Edit: I write "If you really need to", because I have experienced that I never need to turn on debug-logging after deployment, because it is always turned on! This is OK for applications where I have normal (but not extreme) requirements on response-time and throughput. Logging to an UDP-appender is fast (and does not fill up the disk). Or using rolling file appender is quite safe, and fast enough for my use. Always having the debug-log available is a life-saver when nailing down those hard-to-reproduce bugs.

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