'Log4j2 + AWS JAVA LAMBDA + CLOUD WATCH LOGS

I am using the following configurations in my code but cloudwatch logs are not getting generated. Log4j2.xml is present in main/resources. I am following the AWS documentation and some stack overflow but I am not getting the logs it says -

Cloudwatch Logs

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
START RequestId: e36-c827-46-93-a7 Version: $LATEST
Transforming org/apache/logging/log4j/core/lookup/JndiLookup (lambdainternal.CustomerClassLoader@433d)
2022-03-07T16:01:51.527+05:30   2022-03-07 10:31:51,526 main ERROR Error processing element Lambda ([Appenders: null]): CLASS_NOT_FOUND
2022-03-07T16:01:51.626+05:30   2022-03-07 10:31:51,626 main ERROR Unable to locate appender "Lambda" for logger config "root"

Log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration packages="com.amazonaws.services.lambda.runtime.log4j2" status="WARN">
    <Appenders>
        <Lambda name="Lambda">
            <PatternLayout>
                <pattern>%d{yyyy-MM-dd HH:mm:ss} %X{AWSRequestId} %-5p %c{1}:%L - %m%n</pattern>
            </PatternLayout>
        </Lambda>
    </Appenders>
    <Loggers>
        <Root level="INFO">
            <AppenderRef ref="Lambda" />
        </Root>
        <Logger name="software.amazon.awssdk" level="WARN" />
        <Logger name="software.amazon.awssdk.request" level="DEBUG" />
    </Loggers>
</Configuration>

Gradle Dependencies used:

implementation 'org.apache.logging.log4j:log4j-api:2.17.2'
implementation 'org.apache.logging.log4j:log4j-core:2.17.2'
runtimeOnly 'org.apache.logging.log4j:log4j-slf4j18-impl:2.17.0'
runtimeOnly 'com.amazonaws:aws-lambda-java-log4j2:1.5.1'

Service class Logging Declaration

@Slf4j
public class ABC {
        
    public void method1(){
        log.info(" HELLO WORLD  ________ ");
    }
}

Please help.

javaaws-lambdalog4j2amazon-cloudwatch


Solution 1:[1]

alternatively, You can use the Context object to get a logger like below

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.LambdaLogger;
import com.amazonaws.services.lambda.runtime.RequestHandler;
public class MyClass implements RequestHandler<Map<String, Object>, Void> {
   @Override
public Void handleRequest(Map<String, Object> inputRequest, Context context) {
LambdaLogger logger = context.getLogger();
logger.log("Hello ");
}}

Solution 2:[2]

Changing these lines:

runtimeOnly 'org.apache.logging.log4j:log4j-slf4j18-impl:2.17.0'    
runtimeOnly 'com.amazonaws:aws-lambda-java-log4j2:1.5.1'

To

implementation 'org.apache.logging.log4j:log4j-slf4j18-impl:2.17.0'
implementation 'com.amazonaws:aws-lambda-java-log4j2:1.5.1'

Solved this problem for me

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Srinivas Nangana
Solution 2 Nick Sutton

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