为 Log4j2 配置 Grails 3

Question

我们想使用 Log4j2 作为与 grails 3 的日志绑定。

据我目前所知。我们有许多使用各种记录器的从属依赖项，因此我们需要使用 SLF4J API。然后，不是让 grails / groovy / spring 将 SLF4J API 重定向到 Logback 绑定，我们需要将每个重定向到 Log4j2 绑定。

由于 grails 3 使用 Logback 绑定，我计划检查 build.gradle 中的每个依赖项，排除 Logback 绑定，并包括 Log4j2 绑定。这行得通吗？更新：是

我们是否还需要将 Log4j2 API 桥接到 SLF4j API？我们需要什么依赖？更新：见下文。

最后，我假设我们需要放弃 grails 3 logback.groovy 配置，只将其中一个 log4j2 配置放在 src/main/resources 中。更新：是

我会 post 更新，但我敢打赌以前有人这样做过。

2016-03-18 更新：

事实证明这非常简单。我在我的 grails 3 项目上做了一个 './gradlew dependencies' 来查看哪些依赖项在 Logback binding/implementation (group: 'ch.qos.logback', module: 'logback-classic')

首先，这是通过 'grails create-app testit' 命令生成的默认值 build.gradle：

buildscript {
    ext {
        grailsVersion = project.grailsVersion
    }
    repositories {
        mavenLocal()
        maven { url "https://repo.grails.org/grails/core" }
    }
    dependencies {
        classpath "org.grails:grails-gradle-plugin:$grailsVersion"
        classpath "com.bertramlabs.plugins:asset-pipeline-gradle:2.5.0"
        classpath "org.grails.plugins:hibernate4:5.0.2"
    }
}

version "0.1"
group "testit"

apply plugin:"eclipse"
apply plugin:"idea"
apply plugin:"war"
apply plugin:"org.grails.grails-web"
apply plugin:"org.grails.grails-gsp"
apply plugin:"asset-pipeline"

ext {
    grailsVersion = project.grailsVersion
    gradleWrapperVersion = project.gradleWrapperVersion
}

repositories {
    mavenLocal()
    maven { url "https://repo.grails.org/grails/core" }
}

dependencyManagement {
    imports {
        mavenBom "org.grails:grails-bom:$grailsVersion"
    }
    applyMavenExclusions false
}

dependencies {
    compile "org.springframework.boot:spring-boot-starter-logging"
    compile "org.springframework.boot:spring-boot-autoconfigure"
    compile "org.grails:grails-core"
    compile "org.springframework.boot:spring-boot-starter-actuator"
    compile "org.springframework.boot:spring-boot-starter-tomcat"
    compile "org.grails:grails-dependencies"
    compile "org.grails:grails-web-boot"
    compile "org.grails.plugins:cache"
    compile "org.grails.plugins:scaffolding"
    compile "org.grails.plugins:hibernate4"
    compile "org.hibernate:hibernate-ehcache"
    console "org.grails:grails-console"
    profile "org.grails.profiles:web:3.1.4"
    runtime "org.grails.plugins:asset-pipeline"
    runtime "com.h2database:h2"
    testCompile "org.grails:grails-plugin-testing"
    testCompile "org.grails.plugins:geb"
    testRuntime "org.seleniumhq.selenium:selenium-htmlunit-driver:2.47.1"
    testRuntime "net.sourceforge.htmlunit:htmlunit:2.18"
}

task wrapper(type: Wrapper) {
    gradleVersion = gradleWrapperVersion
}

assets {
    minifyJs = true
    minifyCss = true
}

依赖报告显示它们被两个依赖拉入：

    compile "org.springframework.boot:spring-boot-starter-logging"

和

    compile "org.springframework.boot:spring-boot-starter-actuator"

所以，我只需要对 build.gradle 的依赖项部分进行一些更改：

dependencies {
    // commented out the original way using Logback    
    //compile "org.springframework.boot:spring-boot-starter-logging"

    // added the new way using Log4j2, yes, spring makes it easy
    compile "org.springframework.boot:spring-boot-starter-log4j2"

    // changed spring-boot-autoconfigure so that it would not
    // pull in the logback binding/implementation
    compile ('org.springframework.boot:spring-boot-autoconfigure') {
       exclude group: 'ch.qos.logback', module: 'logback-classic'
    }

    // and finally, added the log4j2 binding/implementation
    compile "org.apache.logging.log4j:log4j-api:2.5"
    compile "org.apache.logging.log4j:log4j-core:2.5"

    // the rest is unchanged
    compile "org.grails:grails-core"
    compile "org.springframework.boot:spring-boot-starter-actuator"
    compile "org.springframework.boot:spring-boot-starter-tomcat"
    compile "org.grails:grails-dependencies"
    compile "org.grails:grails-web-boot"
    compile "org.grails.plugins:cache"
    compile "org.grails.plugins:scaffolding"
    compile "org.grails.plugins:hibernate4"
    compile "org.hibernate:hibernate-ehcache"
    console "org.grails:grails-console"
    profile "org.grails.profiles:web:3.1.4"
    runtime "org.grails.plugins:asset-pipeline"
    runtime "com.h2database:h2"
    testCompile "org.grails:grails-plugin-testing"
    testCompile "org.grails.plugins:geb"
    testRuntime "org.seleniumhq.selenium:selenium-htmlunit-driver:2.47.1"
    testRuntime "net.sourceforge.htmlunit:htmlunit:2.18"
}

在src/main/resources中，我们添加了一个log4j2.xml。

在groovy代码中，我们使用了：

import org.apache.logging.log4j.Logger
import org.apache.logging.log4j.LogManager
import org.apache.logging.log4j.ThreadContext

private static final Logger log = LogManager.getLogger(getClass())

log.info('Hello World')

我们还在频繁使用的类.

的构造函数中放置了 ThreadContext 语句

就是这样。现在我们正在执行快速的异步日志记录，在配置更改时不会丢失任何日志消息。

Answer 1

忘记post一些东西作为答案。这是您可以投票的答案，但我将有关解决方案的所有信息放在上面的评论中。

为 Log4j2 配置 Grails 3

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