Gradle 找不到 slf4j LoggerFactory 类定义

Question

我正在尝试构建和运行在 IntelliJ 中使用 slf4j 日志记录的 Spark 网络服务器。它在最初用于添加日志记录的计算机上构建良好（也在 IntelliJ 中），但在我的机器上却没有。

这是完整的build.gradle 文件（请参阅project(':webserver') 了解使用记录器的部分：

buildscript {
    repositories {
        maven {
            url "https://plugins.gradle.org/m2/"
        }
    }
    dependencies {
        classpath "gradle.plugin.com.avast.gradle:docker-compose-gradle-plugin:0.3.27"
    }
}

subprojects {
    repositories {
        mavenLocal()
        mavenCentral()
        jcenter()
    }

    apply plugin: "java"
    apply plugin: "idea"
    apply plugin: "checkstyle"
    apply plugin: "pmd"
    apply plugin: "findbugs"
    apply plugin: "application"
    apply plugin: "com.avast.gradle.docker-compose"

    checkstyle {
        configFile = "../config/checkstyle/checkstyle.xml" as File
        toolVersion = "6.0"
    }
}

project(':webserver') {
    mainClassName = "org.passport.webserver.WebServer"
    dependencies {
        compile project(':core')
        compile "com.sparkjava:spark-core:2.6.0"
        testCompile 'junit:junit:4.12'
        compile group: 'org.json', name: 'json', version: '20090211'
        compile group: 'org.slf4j', name: 'slf4j-log4j12', version: '1.6.1'
    }

    sourceSets {
        main {
            java {
                srcDir 'src/main/java/'
            }
        }
    }
}

project(':customsUI') {
    mainClassName = "org.passport.customsui.CustomsUI"
    dependencies {
        compile project(':core')
        testCompile 'junit:junit:4.12'
    }

    sourceSets {
        main {
            java {
                srcDir 'src/main/java/'
            }
        }
    }
}

project(':handlerUI') {
    mainClassName = "org.passport.handlerui.HandlerUI"
    dependencies {
        compile project(':core')
        testCompile 'junit:junit:4.12'
    }

    sourceSets {
        main {
            java {
                srcDir 'src/main/java/'
            }
        }
    }
}

project(':core') {
    mainClassName = "org.passport.core.PassPortChaincode"
    dependencies {
        compile 'io.grpc:grpc-all:0.13.2'
        compile 'commons-cli:commons-cli:1.3.1'
        compile 'org.glassfish:javax.json:1.1.0-M1'
        compile files('lib/shim-client-1.0.jar')
        testCompile 'junit:junit:4.12'
    }

    sourceSets {
        main {
            java {
                srcDir 'src/main/java/'
            }
        }
    }
}

这是使用记录器的代码：

package org.passport.webserver;

import org.passport.webserver.endpoints.ContainerClaimDao;
import org.passport.webserver.endpoints.PackageClaimDao;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static spark.Spark.before;
import static spark.Spark.get;
import static spark.Spark.path;
import static spark.Spark.post;

/**
 * The server matches requests (routs) and calls the appropriate endpoints.
 */
public final class Server {

    private static Logger logger = LoggerFactory.getLogger(Server.class);
    private static ContainerClaimDao containers = new ContainerClaimDao();
    private static PackageClaimDao packages = new PackageClaimDao();

    private Server() {

    }

    /**
     * Starts the router.
     * @param args run arguments
     */
    public static void main(String[] args) {
        path("/containers/:container-id", () -> {
            before("/*", (q, a) -> logger.info("Received api call: " + q.url() + "."));

            post("", (request, response) -> containers.add(request, response));

            get("/container-claims", (request, response) -> containers.get(request, response));

            get("/package-claims", (request, response) ->   packages.get(request, response));

        });
    }

}

这是我得到的错误：

"C:\Program Files\Java\jdk1.8.0_91\bin\java" -Didea.launcher.port=7534 "-Didea.launcher.bin.path=C:\Program Files (x86)\JetBrains\IntelliJ IDEA 2016.2.4\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_91\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\rt.jar;C:\Users\lover\repositories\passport\webserver\build\classes\main;C:\Program Files (x86)\JetBrains\IntelliJ IDEA 2016.2.4\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain org.passport.webserver.Server
Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
    at org.passport.webserver.Server.<clinit>(Server.java:18)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:264)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:123)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 4 more

我在 StackOverflow 上查看了几个问题，但似乎都没有解决问题：

• java.lang.NoClassDefFoundError: org.slf4j.LoggerFactory - 我正在使用 gradle 构建，不要认为我应该在我的类路径中下载/放置一些 jar
• ClassNotFoundException: org.slf4j.LoggerFactory - 同上
• NoClassDefFoundError: org/slf4j/Logger - 又是罐子里的东西
• Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory - 我不确定“胖罐子”/ShadowJar 是否适用，也不确定如何修改我的构建文件以使用它们
• NoClassDefFoundError: org/slf4j/LoggerFactory while creating a runnable *.jar with gradle - 我试过几次刷新 gradle，重启 IntelliJ，甚至重启我的电脑
• Gradle Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory - 见下文

我尝试了以下依赖项：

• compile group: 'org.slf4j', name: 'slf4j-log4j12', version: '1.6.1'
• compile 'org.slf4j:slf4j-api:1.7.24' 和 compile 'org.slf4j:slf4j-simple:1.7.24'
• compile group: 'org.slf4j', name: 'slf4j-simple', version: '1.6.1'

这些似乎都没有什么不同。有什么想法吗？

Answer 1

我最终删除了我的 Gradle 缓存（.gradle 文件夹）并重新下载了所有内容，从而解决了问题。

Answer 2

如果您使用的是 Gradle，请将这两行添加到您的 build.gradle 依赖项中以使用 Spark 2.6.0

compile "com.sparkjava:spark-core:2.6.0"

compile group: 'org.slf4j', name: 'slf4j-simple', version: '1.7.21'