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Log4J2 with JSON Template Layout

Introdução

Projeto SpringBoot Web com Groovy/Java explicando como configurar o Log4j2 para imprimir os logs em formato JSON.

Tecnologias

  • SpringBoot 2.6.7
    • spring-boot-starter-web
    • spring-boot-starter-log4j2
  • Java 11
  • Groovy 3.0.10
  • Gradle 7.4.1

Explicação

Por padrão o SpringBoot usa o Logstash como implementação de logs, vamos substituir pelo Log4j2 e fazer as configurações necessárias para imprimir os logs no formato JSON.

Dependências

  1. Remover a dependência do Logstash de todas as dependências Spring adicionando o trecho abaixo no build.gradle 
    configurations {
    all*.exclude module: 'spring-boot-starter-logging'
}
  2. Adicionar as dependencias do log4j2 e das configurações no build.gradle: 
    implementation 'org.springframework.boot:spring-boot-starter-log4j2'
implementation 'org.apache.logging.log4j:log4j-layout-template-json'
implementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-yaml'
    1. spring-boot-starter-log4j2 → módulo do Spring com as depências mínimas do Log4j2;
    2. log4j-layout-template-json → biblioteca que exporta o log no formato JSON;
    3. jackson-dataformat-yaml → biblioteca opcional para usarmos o arquivo de configuração do Log4j2 no formato log4j2.yaml em vez de log4j2.properties
    4. Pode ser necessário adicionar jackson-databind, como esse projeto é spring-web, já tem essa dependência. Mais informações

Configuração

Adicionar o arquivo de configuração src/main/resources/log4j2.yaml

Configuration:
    status: warn
    appenders:
        Console:
            -   name: JSON_LAYOUT_APPENDER
                target: SYSTEM_OUT
                follow: true
                JsonTemplateLayout:
                    eventTemplateUri: classpath:EcsLayout.json
    Loggers:
        Root:
            level: info
            additivity: false
            AppenderRef:
                ref: JSON_LAYOUT_APPENDER

Na propriedade eventTemplateUri: classpath:EcsLayout.json definimos o template desejado. Tem vários templates disponíveis: EcsLayout, LogstashJsonEventLayoutV1, GelfLayout, GcpLayout, JsonLayout. Apenas com essa configuração já temos o log impresso no formato JSON:

  • Log Padrão Spring img.png
  • Log Json com EcsLayout img.png
{
    "@timestamp": "2022-05-04T23:41:49.008Z",
    "ecs.version": "1.2.0",
    "log.level": "INFO",
    "message": "Started Log4j2JsonApplication in 0.653 seconds (JVM running for 1.227)",
    "process.thread.name": "main",
    "log.logger": "com.example.log4j2json.Log4j2JsonApplication"
}

JsonTemplateLayout Customizado

Podemos criar um JsonTemplateLayout customizado resources/log4j2-meu-template.json e alterar no arquivo de configuração src/main/resources/log4j2.yaml para usá-lo: eventTemplateUri: classpath:log4j2-meu-template.json

Existem vários resolvers disponíveis: counter, timestamp, level, caseConverter, message, thread, logger, source, exception, mdc, ndc

Estrutura do JsonTemplateLayout customizado

{
    "idx": {
        "$resolver": "counter",
        "start": 1
    },
    "log_date": {
        "$resolver": "timestamp",
        "pattern": {
            "format": "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'",
            "timeZone": "UTC"
        }
    },
    "nanos": {
        "$resolver": "timestamp",
        "epoch": {
            "unit": "nanos"
        }
    },
    "level": {
        "$resolver": "level",
        "field": "name"
    },
    "level_lower": {
        "$resolver": "caseConverter",
        "case": "lower",
        "input": {
            "$resolver": "level",
            "field": "name"
        }
    },
    "level_code": {
        "$resolver": "level",
        "field": "severity",
        "severity": {
            "field": "code"
        }
    },
    "message": {
        "$resolver": "message",
        "stringified": true
    },
    "thread_name": {
        "$resolver": "thread",
        "field": "name"
    },
    "logger_name": {
        "$resolver": "logger",
        "field": "name"
    },
    "class": {
        "$resolver": "source",
        "field": "className"
    },
    "resource": {
        "service.name": "log4j2-json",
        "java.version": "${sys:java.version}"
    },
    "exception": {
        "type": {
            "$resolver": "exception",
            "field": "className"
        },
        "message": {
            "$resolver": "exception",
            "field": "message"
        },
        "stacktrace": {
            "$resolver": "exception",
            "field": "stackTrace",
            "stackTrace": {
                "stringified": true
            }
        }
    }
}

Resultado dos logs com JsonTemplateLayout customizado:

img.png

{
    "log_date": "2022-05-04T23:53:55.572Z",
    "nanos": 1651708435572993000,
    "level": "INFO",
    "level_code": 6,
    "message": "Started Log4j2JsonApplication in 0.931 seconds (JVM running for 2.094)",
    "thread_name": "main",
    "logger_name": "com.example.log4j2json.Log4j2JsonApplication",
    "resource": {
        "service.name": "log4j2-json",
        "java.version": "11.0.15"
    }
}

Resultado dos logs com exceção

  • EcsLayout: 
    {
  "@timestamp": "2022-05-04T23:59:00.288Z",
  "ecs.version": "1.2.0",
  "log.level": "ERROR",
  "message": "TestingLog",
  "process.thread.name": "http-nio-8080-exec-5",
  "log.logger": "com.example.log4j2json.services.LogService",
  "error.type": "java.lang.RuntimeException",
  "error.message": "Exception 1",
  "error.stack_trace": "java.lang.RuntimeException: Exception 1\n\tat java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)\n\tat java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)\n\tat java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)\n\tat java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)\n\tat org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:72)\n\tat org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor(ConstructorSite.java:105)\n\tat org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:286)\n\tat com.example.log4j2json.services.LogService.writeLog(LogService.groovy:23)\n\tat com.example.log4j2json.services.LogService$writeLog.call(Unknown Source)\n\tat com.example.log4j2json.controllers.LogController.writeLog(LogController.groovy:25)\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)\n\tat java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\n\tat java.base/java.lang.reflect.Method.invoke(Method.java:566)\n\tat org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)\n\tat org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150)\n\tat org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)\n\tat org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)\n\tat org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067)\n\tat org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)\n\tat org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)\n\tat org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)\n\tat javax.servlet.http.HttpServlet.service(HttpServlet.java:655)\n\tat org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)\n\tat javax.servlet.http.HttpServlet.service(HttpServlet.java:764)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)\n\tat org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)\n\tat org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)\n\tat org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)\n\tat org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)\n\tat org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)\n\tat org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)\n\tat org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)\n\tat org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)\n\tat org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)\n\tat org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)\n\tat org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360)\n\tat org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399)\n\tat org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)\n\tat org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:890)\n\tat org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743)\n\tat org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)\n\tat org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)\n\tat org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)\n\tat org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)\n\tat java.base/java.lang.Thread.run(Thread.java:829)\nCaused by: java.lang.IllegalArgumentException: Exception Cause\n\tat java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)\n\tat java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)\n\tat java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)\n\tat java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)\n\tat org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:72)\n\tat org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor(ConstructorSite.java:105)\n\tat org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:277)\n\t... 53 more\n"
}
  • JsonTemplateLayout customizado: 
    {
    "log_date": "2022-05-04T23:56:41.159Z",
    "nanos": 1651708601159476000,
    "level": "ERROR",
    "level_code": 3,
    "message": "TestingLog",
    "thread_name": "http-nio-8080-exec-1",
    "logger_name": "com.example.log4j2json.services.LogService",
    "resource": {
        "service.name": "log4j2-json",
        "java.version": "11.0.15"
    },
    "exception": {
        "type": "java.lang.RuntimeException",
        "message": "Exception 1",
        "stacktrace": "java.lang.RuntimeException: Exception 1\n\tat java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)\n\tat java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)\n\tat java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)\n\tat java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)\n\tat org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:72)\n\tat org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor(ConstructorSite.java:105)\n\tat org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:59)\n\tat org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:263)\n\tat org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:286)\n\tat com.example.log4j2json.services.LogService.writeLog(LogService.groovy:23)\n\tat com.example.log4j2json.services.LogService$writeLog.call(Unknown Source)\n\tat org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)\n\tat org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)\n\tat org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:148)\n\tat com.example.log4j2json.controllers.LogController.writeLog(LogController.groovy:25)\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)\n\tat java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\n\tat java.base/java.lang.reflect.Method.invoke(Method.java:566)\n\tat org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)\n\tat org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150)\n\tat org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)\n\tat org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)\n\tat org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067)\n\tat org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)\n\tat org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)\n\tat org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)\n\tat javax.servlet.http.HttpServlet.service(HttpServlet.java:655)\n\tat org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)\n\tat javax.servlet.http.HttpServlet.service(HttpServlet.java:764)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)\n\tat org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)\n\tat org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)\n\tat org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)\n\tat org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)\n\tat org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)\n\tat org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)\n\tat org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)\n\tat org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)\n\tat org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)\n\tat org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)\n\tat org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360)\n\tat org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399)\n\tat org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)\n\tat org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:890)\n\tat org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743)\n\tat org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)\n\tat org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)\n\tat org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)\n\tat org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)\n\tat java.base/java.lang.Thread.run(Thread.java:829)\nCaused by: java.lang.IllegalArgumentException: Exception Cause\n\tat java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)\n\tat java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)\n\tat java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)\n\tat java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)\n\tat org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:72)\n\tat org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor(ConstructorSite.java:105)\n\tat org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:59)\n\tat org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:263)\n\tat org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:277)\n\t... 56 more\n"
    }
}

Como usar Logger:

Tem várias opções para instanciar o Logger do Log4j2 ou opcionalmente usar o Slf4j (que é uma fachada para implementação de log). Usei o nome qualificado das classes pra ficar mais detalhado.

  • Usando anotação:

    • Groovy → @groovy.util.logging.Log4j2 ou @groovy.util.logging.Slf4j
    • Java/Lombok → @lombok.extern.log4j.Log4j2 ou @lombok.extern.slf4j.Slf4j

  • Usando Factory/Manager (forma tradicional)

private final static org.apache.logging.log4j.Logger LOGGER = org.apache.logging.log4j.LogManager.getLogger(LogService)

private final static org.slf4j.Logger LOGGER_SFL4J = org.slf4j.LoggerFactory.getLogger(LogService)

Optei por usar a anotação @Log4j2, mas deixei um exemplo usando Factory/Manager.

import groovy.util.logging.Log4j2
import org.apache.logging.log4j.LogManager
import org.apache.logging.log4j.Logger
import org.springframework.boot.logging.LogLevel
import org.springframework.stereotype.Service

@Log4j2
@Service
class LogService {

    private final static Logger LOGGER = LogManager.getLogger(this)

    void writeLog(String message, LogLevel level) {
        switch (level) {
            case LogLevel.INFO:
                log.info(message)
                break
            case LogLevel.WARN:
                log.warn(message)
                break
            case LogLevel.ERROR:
                log.error(message, new RuntimeException("Exception 1", new IllegalArgumentException("Exception Cause")))
                break
            default:
                LOGGER.debug(message)
        }
    }

}

Testando

Implementei um endpoint para testar o funcionamento do log com os seguintes parâmetros:

  • message → [string][requestParam][obrigatório]
  • level → [string][requestParam][opcional][default:INFO]
    • caso seja informado ERROR será lançada uma exceção.
curl --location --request GET 'http://localhost:8080/log?message=TestingLogInfo'
curl --location --request GET 'http://localhost:8080/log?message=TestingLogWarn&level=WARN'
curl --location --request GET 'http://localhost:8080/log?message=TestingLogError&level=ERROR'

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Log4j2: Printing the logs in JSON format

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