Log4j2 configuration - No log4j2 configuration file found

Is this a simple eclipse java project without maven etc? In that case you will need to put the log4j2.xml file under src folder in order to be able to find it on the classpath.If you use maven put it under src/main/resources or src/test/resources

You need to choose one of the following solutions:

1. Put the log4j2.xml file in resource directory in your project so the log4j will locate files under class path.
2. Use system property -Dlog4j.configurationFile=file:/path/to/file/log4j2.xml

Was following the documentations - Apache Log4j2 Configuratoin and Apache Log4j2 Maven in configuring log4j2 with yaml. As per the documentation, the following maven dependencies are required:

  <dependency>    <groupId>org.apache.logging.log4j</groupId>    <artifactId>log4j-api</artifactId>    <version>2.8.1</version>  </dependency>  <dependency>    <groupId>org.apache.logging.log4j</groupId>    <artifactId>log4j-core</artifactId>    <version>2.8.1</version>  </dependency>

and

<dependency>    <groupId>com.fasterxml.jackson.dataformat</groupId>    <artifactId>jackson-dataformat-yaml</artifactId>    <version>2.8.6</version></dependency>

Just adding these didn't pick the configuration and always gave error. The way of debugging configuration by adding -Dorg.apache.logging.log4j.simplelog.StatusLogger.level=TRACE helped in seeing the logs. Later had to download the source using Maven and debugging helped in understanding the depended classes of log4j2. They are listed in org.apache.logging.log4j.core.config.yaml.YamlConfigurationFactory:

com.fasterxml.jackson.databind.ObjectMappercom.fasterxml.jackson.databind.JsonNodecom.fasterxml.jackson.core.JsonParsercom.fasterxml.jackson.dataformat.yaml.YAMLFactory

Adding dependency mapping for jackson-dataformat-yaml will not have the first two classes. Hence, add the jackson-databind dependency to get yaml configuration working:

<dependency>    <groupId>com.fasterxml.jackson.core</groupId>    <artifactId>jackson-databind</artifactId>    <version>2.8.6</version></dependency>

You may add the version by referring to the Test Dependencies section of log4j-api version item from MVN Repository. E.g. for 2.8.1 version of log4j-api, refer this link and locate the jackson-databind version.

Moreover, you can use the below Java code to check if the classes are available in the classpath:

System.out.println(ClassLoader.getSystemResource("log4j2.yml")); //Check if file is available in CPClassLoader cl = Thread.currentThread().getContextClassLoader(); //Code as in log4j2 API. Version: 2.8.1 String [] classes = {"com.fasterxml.jackson.databind.ObjectMapper", "com.fasterxml.jackson.databind.JsonNode", "com.fasterxml.jackson.core.JsonParser", "com.fasterxml.jackson.dataformat.yaml.YAMLFactory"}; for(String className : classes) {     cl.loadClass(className); }