I am writing Java code that tests a Java library. The library includes its own log4j2 configuration as part of the distribution.
I would like to use log4j2 in my test code without modifying the library's configuration.
Is there a way to have a separate log4j2 configuration for my test code?
This is all running as command-line Java, no servers or web involvement at all.
EDIT to try to be more clear: What I want is to be able to configure loggers, appenders, etc for the test code to use , and at the same time have the library code use its own separate configuration file for its logging. The idea is to use log4j2 in my test code, but without having to change the library's configuration file. Since the library configuration file is part of the library's distribution, I don't want to change it for testing.
This may be helpful:
So one option is to copy the library's configuration (log4j2.xml) to log4j2-test.xml and add your own configuration to log4j2-test.xml.
Furthermore, Log4j2 supports XInclude in XML configuration , so you could use that feature to avoid duplicating the library's configuration in your log4j2-test.xml.
Log4j2 supports "Composite Configuration" which exactly matches your requirement. All you need to do is provide path to multiple files in log4j.configurationFile
property. This can be passed from command line or added to log4j2.component.properties
file in your application.
References: https://logging.apache.org/log4j/2.x/manual/configuration.html#CompositeConfiguration https://logging.apache.org/log4j/2.x/manual/configuration.html#SystemProperties
There are two step you can try to solve for your issue
cmd> java -Dlog4j.configuration=location/xyz.properties
If you use diffent name for configuration rather log4j.properties/.xml file you need to configure that file at runtime by above command for more info have a look here..
Correct format for using an alternate XML file to log4j2.xml:
java -Dlog4j.configurationFile=./location/log4j2-custom.xml
Assuming ./location/log4j2-custom.xml
exists and is the new XML to replace log4j2.xml in this run
参考https://logging.apache.org/log4j/2.x/manual/configuration.html指出您可以在 log4j2.configurationFile 属性下添加多个逗号分隔的文件。
To use multiple configuration files, depending on the environment you must set the.
for example:
if (env.equals("DEV")) {
setConfigFile("log4j2-dev.xml");
}
public static void setConfigFile(String logConfigFile) {
File file = new File(logConfigFile);
LoggerContext context = (org.apache.logging.log4j.core.LoggerContext) LogManager.getContext(false);
context.setConfigLocation(file.toURI());
}
first configure application.yaml file
spring:
profiles:
active: dev
---
spring:
message: running in the dev profile //just to output the message in the log
profiles: dev
logging.config: classpath:log4j2-dev.xml
---
spring:
profiles: prod
logging.config: classpath:log4j2-prod.xml
and create these similar files in your classpath
* log4j2-dev.xml
* log4j2-prod.xml
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