I am using log4j 2.0 for logging my application. But the new log4j 2.0 api don't let us edit the HTMLLayout.it is defined as final class.Another thing, it has the log4j 1.2 api in it.So can ı achieve the extending HTMLLayout using log4j 1.2 api on log4j 2.0 ?If I can, I will customize the html log file as I want.
The question points out that the log4j 2 HtmlLayout class is final, so how can the layout be customized?
The answer is that it cannot without changes to the log4j API. Such changes need to be requested in a Log4j forum.
You'll need to file a feature request in the log4j issue tracker. Requests with patches have the best chance of being addressed quickly.
Related
If log4j doesn't support this then is there some drop-in replacement for log4j that does? I've gone through the docs and lots of google searches, unfortunately all search results come up with "exploit" or "vulnerability" articles.
Splunk provides a splunk-library-javalogging that has appenders for both Log4j2 Core (the reference Log4j2 API implementation) and Logback (the reference SLF4J API implementation).
The appenders use OkHttp 3.x under the hood, so they will behave as all OkHttp-based components. Since splunk-library-javalogging does not set either a proxy nor a proxySelector explicitly (cf. source code), OkHttp falls back to the system wide ProxySelector.
Without any code modification on your part you can use the JVM-wide proxy settings as in this question.
Remark: if by log4j you are referring to Log4j 1.x, you need to replace the log4j:log4j artifact with either log4j-over-slf4j (which forwards to the SLF4J API) or log4j-1.2-api (which forwards to the Log4j2 API).
I am trying to migrate from log4j to log4j2 and am unsure how to reconfigure this part of the properties file to log4j2. I couldn't find much info online.
log4j.logger.httpclient.wire.header=WARN
log4j.logger.httpclient.wire.content=WARN
log4j.logger.org.apache.http=INFO
log4j.logger.org.apache.http.wire=ERROR
Any help would be appreciated. I don't want to use the log4j 1.2 Bridge if possible
I am looking for the utility to convert log4j.xml to log4j2.xml syntax is there any utility available
At first I was going to respond that this cannot be done but it might be somewhat possible.
Log4j 2.13.0 added experimental support for using Log4j 1.x configuration files. If your configuration is compatible, in theory you could start up an application using a Log4j 1.x configuration and then call getRootNode() on the AbstractConfiguration. The root node is very similar to a DOM tree so walking it and converting it to XML wouldn't be too hard. However, Log4j doesn't have a tool provided to do this. Contributions are welcome!
I'm upgrading Log4j-1.2.17 to Log4j2-2.12.2 in my project.
To do that I'm using the log4j-1.2 bridge.
In old version I use property file to configure log4j.
After upgrade everything looks ok, no errors, no warnings. But logs don't appear in file pointed in properties file.
I realized that PropertyConfigurator.class exists in log4j-1.2-api.jar, but methods don't have implementation.
empty PropertyConfigurator.configure(Properties properties)
Can you explain me that?
Which configuration syntax is correct when I use log4j-1.2-api.jar? log4j or log4j2?
Prior to Log4j 2.13.0 log4j-1.2-api only provides compatibility for applications that used the log4j 1.x API for logging. The Log4j 2 configuration is still used as all logging calls are redirected to Log4j 2. So only the Log4j 2 configuration syntax would be valid.
Many of the old log4j 1.x internal classes are also present because many applications were using them in an attempt manually manipulate logging, much of which probably isn't necessary with Log4j 2.
In Log4j 2.13.0 the log4j-1.2-api was extended to provide experimental support for Log4j 1.x configuration files. You would have to compare your log4j 1 configurations with the documentation to determine if that support will work for you. However, the Log4j 1.x PropertyConfigurator still will be a no-op even with the compatibility support.
What is the best way to upgrade from log4j 1.x to 2.x
I have an ANT project. I just deleted the old jar and replaced it with the new log4j is that enough ?
Log4j 2 does not use the same configuration file format. However, Log4j 2.13.0 introduced experimental support for some Log4j 1 configuration files. So you have two choices:
Follow the steps outlined at Migrating from Log4j 1.x which involves including the log4j-1.2-api jar and converting your configuration files to Log4j 2 format or
Include the log4j-1.2-api jar but instead of converting your configuration files follow the steps at Log4j 2 Compatibility with Log4j 1
Note that since option 2 is experimental you may have configurations that Log4j 2 cannot handle. If that happens the Log4j 2 team welcomes you to report a Jira issue to determine how the support can be improved.