How to set relative path for log4j.properties file in Websphere

Question

Hi i am trying to set the log4j.properties path under websphere custom properties as a relative path which is not working.

Setting Location:

Middleware servers > cluster1node1 > Process definition > Java Virtual Machine > Custom properties

This is working:

 Property name: log4j.configuration
 Value: file:/dir1/dir2/my_configs/log4j.properties

This is NOT working.

 Property name: log4j.configuration 
 Value: ${CONFIG_ROOT}/my_configs/log4j.properties 

Where config root is a websphere variable as below;

 Name: CONFIG_ROOT
 Value: /dir1/dir2/

Can someone tell me what possibly i am doing wrong here? I am able to use the similar relative path successfully for a normal application config file. Seems like this issue is applicable for just log4j.properties file.

LATEST UPDATE:

Actually the issue is more related to the filesytem as when i pre-fixed the relative path with file: it worked.

This is working now.

 Property name: log4j.configuration 
 Value: file:${CONFIG_ROOT}/my_configs/log4j.properties 

But why is that? Why it is not working without file: ? And how to make it work without file:

Answer 1

根据此答案中解释的log4j默认初始化过程，log4j尝试将log4j.configuration的值转换为URL，因此需要文件：

Answer 2

The issue was more related to the filesytem because when i pre-fixed the relative path with file: it worked.

This is working now.

 Property name: log4j.configuration 
 Value: file:${CONFIG_ROOT}/my_configs/log4j.properties