问题：

类路径包含多个SLF4J绑定错误

郜谦

2023-03-14

当尝试运行gradle构建时，我得到了这个错误

我理解这是一个版本冲突，但不确定如何解决，以及哪个版本

要排除的版本。。。

gradle依赖关系树是:

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/Users/i/.gradle/caches/modules-
2/files-2.1/org.slf4j/slf4j- 
log4j12/1.6.1/bd245d6746cdd4e6203e976e21d597a46f115802/slf4j-log4j12-
1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in   
[jar:file:/C:/Users/i/.gradle/caches/modules-2/files-
2.1/ch.qos.logback/logback- 
classic/1.1.3/d90276fff414f06cb375f2057f6778cd63c6082f/logback-classic-
1.1.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]

SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an    
explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
SLF4J: Detected both log4j-over-slf4j.jar AND slf4j-log4j12.jar on the class    
path, preempting StackOverflowError. 


 compile - Compile classpath for source set 'main'.
 +--- com.google.code.gson:gson:2.2.4
 +--- com.fasterxml.jackson.core:jackson-core:2.6.0
 +--- com.fasterxml.jackson.core:jackson-databind:2.6.0
 |    +--- com.fasterxml.jackson.core:jackson-annotations:2.6.0
 |    \--- com.fasterxml.jackson.core:jackson-core:2.6.0
 +--- com.fasterxml.jackson.core:jackson-annotations:2.6.0
 +--- com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:2.6.0
 |    +--- com.fasterxml.jackson.core:jackson-core:2.6.0
 |    \--- org.yaml:snakeyaml:1.15
 +--- org.projectlombok:lombok:1.16.10
 +--- javax.validation:validation-api:1.1.0.Final
 +--- org.apache.commons:commons-lang3:3.4
 +--- org.apache.zookeeper:zookeeper:3.4.5
 |    +--- org.slf4j:slf4j-api:1.6.1 -> 1.7.21
 |    +--- org.slf4j:slf4j-log4j12:1.6.1
 |    |    +--- org.slf4j:slf4j-api:1.6.1 -> 1.7.21
 |    |    \--- log4j:log4j:1.2.16
 |    +--- log4j:log4j:1.2.15 -> 1.2.16
 |    +--- jline:jline:0.9.94
 |    |    \--- junit:junit:3.8.1
 |    \--- org.jboss.netty:netty:3.2.2.Final
 +--- org.apache.httpcomponents:httpcore:4.4.5 -> 4.4.6
 +--- org.apache.httpcomponents:httpclient:4.5.3
 |    +--- org.apache.httpcomponents:httpcore:4.4.6
 |    +--- commons-logging:commons-logging:1.2
 |    \--- commons-codec:commons-codec:1.9
 +--- commons-io:commons-io:2.5
 +--- org.jdom:jdom2:2.0.5
 \--- org.slf4j:slf4j-api:1.7.21

 default - Configuration for default artifacts.
 +--- com.google.code.gson:gson:2.2.4
 +--- com.fasterxml.jackson.core:jackson-core:2.6.0
 +--- com.fasterxml.jackson.core:jackson-databind:2.6.0
 |    +--- com.fasterxml.jackson.core:jackson-annotations:2.6.0
 |    \--- com.fasterxml.jackson.core:jackson-core:2.6.0
 +--- com.fasterxml.jackson.core:jackson-annotations:2.6.0
 +--- com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:2.6.0
 |    +--- com.fasterxml.jackson.core:jackson-core:2.6.0
 |    \--- org.yaml:snakeyaml:1.15
 +--- org.projectlombok:lombok:1.16.10
 +--- javax.validation:validation-api:1.1.0.Final
 +--- org.apache.commons:commons-lang3:3.4
 +--- org.apache.zookeeper:zookeeper:3.4.5
 |    +--- org.slf4j:slf4j-api:1.6.1 -> 1.7.21
 |    +--- org.slf4j:slf4j-log4j12:1.6.1
 |    |    +--- org.slf4j:slf4j-api:1.6.1 -> 1.7.21
 |    |    \--- log4j:log4j:1.2.16
 |    +--- log4j:log4j:1.2.15 -> 1.2.16
 |    +--- jline:jline:0.9.94
 |    |    \--- junit:junit:3.8.1
 |    \--- org.jboss.netty:netty:3.2.2.Final
 +--- org.apache.httpcomponents:httpcore:4.4.5 -> 4.4.6
 +--- org.apache.httpcomponents:httpclient:4.5.3
 |    +--- org.apache.httpcomponents:httpcore:4.4.6
 |    +--- commons-logging:commons-logging:1.2
 |    \--- commons-codec:commons-codec:1.9
 +--- commons-io:commons-io:2.5
 +--- org.jdom:jdom2:2.0.5
 \--- org.slf4j:slf4j-api:1.7.21

 runtime - Runtime classpath for source set 'main'.
 +--- com.google.code.gson:gson:2.2.4
 +--- com.fasterxml.jackson.core:jackson-core:2.6.0
 +--- com.fasterxml.jackson.core:jackson-databind:2.6.0
 |    +--- com.fasterxml.jackson.core:jackson-annotations:2.6.0
 |    \--- com.fasterxml.jackson.core:jackson-core:2.6.0
 +--- com.fasterxml.jackson.core:jackson-annotations:2.6.0
 +--- com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:2.6.0
 |    +--- com.fasterxml.jackson.core:jackson-core:2.6.0
 |    \--- org.yaml:snakeyaml:1.15
 +--- org.projectlombok:lombok:1.16.10
 +--- javax.validation:validation-api:1.1.0.Final
 +--- org.apache.commons:commons-lang3:3.4
 +--- org.apache.zookeeper:zookeeper:3.4.5
 |    +--- org.slf4j:slf4j-api:1.6.1 -> 1.7.21
 |    +--- org.slf4j:slf4j-log4j12:1.6.1
 |    |    +--- org.slf4j:slf4j-api:1.6.1 -> 1.7.21
 |    |    \--- log4j:log4j:1.2.16
 |    +--- log4j:log4j:1.2.15 -> 1.2.16
 |    +--- jline:jline:0.9.94
 |    |    \--- junit:junit:3.8.1
 |    \--- org.jboss.netty:netty:3.2.2.Final
 +--- org.apache.httpcomponents:httpcore:4.4.5 -> 4.4.6
 +--- org.apache.httpcomponents:httpclient:4.5.3
 |    +--- org.apache.httpcomponents:httpcore:4.4.6
 |    +--- commons-logging:commons-logging:1.2
 |    \--- commons-codec:commons-codec:1.9
 +--- commons-io:commons-io:2.5
 +--- org.jdom:jdom2:2.0.5
 \--- org.slf4j:slf4j-api:1.7.21

 testCompile - Compile classpath for source set 'test'.
 +--- com.google.code.gson:gson:2.2.4
 +--- com.fasterxml.jackson.core:jackson-core:2.6.0
 +--- com.fasterxml.jackson.core:jackson-databind:2.6.0
 |    +--- com.fasterxml.jackson.core:jackson-annotations:2.6.0
 |    \--- com.fasterxml.jackson.core:jackson-core:2.6.0
 +--- com.fasterxml.jackson.core:jackson-annotations:2.6.0
 +--- com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:2.6.0
 |    +--- com.fasterxml.jackson.core:jackson-core:2.6.0
 |    \--- org.yaml:snakeyaml:1.15
 +--- org.projectlombok:lombok:1.16.10
 +--- javax.validation:validation-api:1.1.0.Final
 +--- org.apache.commons:commons-lang3:3.4
 +--- org.apache.zookeeper:zookeeper:3.4.5
 |    +--- org.slf4j:slf4j-api:1.6.1 -> 1.7.21
 |    +--- org.slf4j:slf4j-log4j12:1.6.1
 |    |    +--- org.slf4j:slf4j-api:1.6.1 -> 1.7.21
 |    |    \--- log4j:log4j:1.2.16
 |    +--- log4j:log4j:1.2.15 -> 1.2.16
 |    +--- jline:jline:0.9.94
 |    |    \--- junit:junit:3.8.1 -> 4.11
 |    |         \--- org.hamcrest:hamcrest-core:1.3
 |    \--- org.jboss.netty:netty:3.2.2.Final
 +--- org.apache.httpcomponents:httpcore:4.4.5 -> 4.4.6
 +--- org.apache.httpcomponents:httpclient:4.5.3
 |    +--- org.apache.httpcomponents:httpcore:4.4.6
 |    +--- commons-logging:commons-logging:1.2
 |    \--- commons-codec:commons-codec:1.9
 +--- commons-io:commons-io:2.5
 +--- org.jdom:jdom2:2.0.5
 +--- org.slf4j:slf4j-api:1.7.21
 \--- junit:junit:4.11 (*)

 testRuntime - Runtime classpath for source set 'test'.
 +--- com.google.code.gson:gson:2.2.4
 +--- com.fasterxml.jackson.core:jackson-core:2.6.0
 +--- com.fasterxml.jackson.core:jackson-databind:2.6.0
 |    +--- com.fasterxml.jackson.core:jackson-annotations:2.6.0
 |    \--- com.fasterxml.jackson.core:jackson-core:2.6.0
 +--- com.fasterxml.jackson.core:jackson-annotations:2.6.0
 +--- com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:2.6.0
 |    +--- com.fasterxml.jackson.core:jackson-core:2.6.0
 |    \--- org.yaml:snakeyaml:1.15
 +--- org.projectlombok:lombok:1.16.10
 +--- javax.validation:validation-api:1.1.0.Final
 +--- org.apache.commons:commons-lang3:3.4
 +--- org.apache.zookeeper:zookeeper:3.4.5
 |    +--- org.slf4j:slf4j-api:1.6.1 -> 1.7.21
 |    +--- org.slf4j:slf4j-log4j12:1.6.1
 |    |    +--- org.slf4j:slf4j-api:1.6.1 -> 1.7.21
 |    |    \--- log4j:log4j:1.2.16
 |    +--- log4j:log4j:1.2.15 -> 1.2.16
 |    +--- jline:jline:0.9.94
 |    |    \--- junit:junit:3.8.1 -> 4.11
 |    |         \--- org.hamcrest:hamcrest-core:1.3
 |    \--- org.jboss.netty:netty:3.2.2.Final
 +--- org.apache.httpcomponents:httpcore:4.4.5 -> 4.4.6
 +--- org.apache.httpcomponents:httpclient:4.5.3
 |    +--- org.apache.httpcomponents:httpcore:4.4.6
 |    +--- commons-logging:commons-logging:1.2
 |    \--- commons-codec:commons-codec:1.9
 +--- commons-io:commons-io:2.5
 +--- org.jdom:jdom2:2.0.5
 +--- org.slf4j:slf4j-api:1.7.21
 \--- junit:junit:4.11 (*)

但我甚至不知道怎么读…

你能帮忙吗？

共有3个答案

索梓

2023-03-14

您的依赖动物园还包含org.slf4j： slf4j-api依赖项。所以只要排除它

+--- org.apache.zookeeper:zookeeper:3.4.5
 |    +--- org.slf4j:slf4j-api:1.6.1 -> 1.7.21
 |    +--- org.slf4j:slf4j-log4j12:1.6.1
 |    |    +--- org.slf4j:slf4j-api:1.6.1 -> 1.7.21    # <-- dependency includes slf4j-api
 |    |    \--- log4j:log4j:1.2.16
 |    +--- log4j:log4j:1.2.15 -> 1.2.16
 |    +--- jline:jline:0.9.94
 |    |    \--- junit:junit:3.8.1
 |    \--- org.jboss.netty:netty:3.2.2.Final
 +--- org.apache.httpcomponents:httpcore:4.4.5 -> 4.4.6
 +--- org.apache.httpcomponents:httpclient:4.5.3
 |    +--- org.apache.httpcomponents:httpcore:4.4.6
 |    +--- commons-logging:commons-logging:1.2
 |    \--- commons-codec:commons-codec:1.9
 +--- commons-io:commons-io:2.5
 +--- org.jdom:jdom2:2.0.5
 +--- org.slf4j:slf4j-api:1.7.21  # <-- Also included as a first tier dependency

在你的 build.gradle 中，只需将其从动物园管理员库中排除即可。

dependencies {
    compile('org.apache.zookeeper:zookeeper:3.4.5') {
        // exclude transitive logging dependency from zookeeper
        exclude group: 'org.slf4j'
        // might need to exclude log4j, not sure?
        exclude group: 'log4j', module: 'log4j'
    }
    // .. other dependencies
}

罗波鸿

2023-03-14

正如@Vampire所说，这看起来像是buildscript类路径的问题，而不是编译或运行时配置的问题。它可能可以通过

buildscript {
    configurations {
        classpath {
            exclude group: 'ch.qos.logback', module: 'logback-classic'
            // OR
            exclude group: 'org.slf4j', module: 'slf4j-log4j12'
        }
    }
    dependencies { ... }
}

曹浩淼

2023-03-14

首先，SLF4J是各种日志框架（例如java.util.logging、logback、log4j）的简单外观，允许最终用户在部署时插入所需的日志框架。

简单来说，这意味着什么？

当您使用SLF4J时，您的代码将依赖于SLF4J（SLF4J-API）提供的一个通用日志记录接口，另一方面，您将把您选择的日志记录框架插入SLF4J，这将允许您轻松切换不同的日志记录框架。

因此，您在使用SLF4J外观时在代码中使用的所有日志调用都将委托给底层日志框架。

从图中可以看出，您的应用程序使用一个通用的API接口＜code＞SLF4J API

现在，让我们看看你的Gradle输出:

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/Users/i/.gradle/caches/modules-
2/files-2.1/org.slf4j/slf4j- 
log4j12/1.6.1/bd245d6746cdd4e6203e976e21d597a46f115802/slf4j-log4j12-
1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in   
[jar:file:/C:/Users/i/.gradle/caches/modules-2/files-
2.1/ch.qos.logback/logback- 
classic/1.1.3/d90276fff414f06cb375f2057f6778cd63c6082f/logback-classic-
1.1.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]

SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an    
explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
SLF4J: Detected both log4j-over-slf4j.jar AND slf4j-log4j12.jar on the class    
path, preempting StackOverflowError.

这是两个不同的SLF4J日志框架绑定的情况，第一个是org.slf4j/slf4j-log4j12，这是log4j日志框架绑定，第二个是ch.qos.logback/logback-classic，这是Logback日志框架，SLFJ API的本机实现。

因此，为了解决您的问题，您需要从您的类路径中排除其中一个。

具体来说，这里有问题的工件是组织.apache.动物园管理员：动物园管理员：3.4.5，所以让我们排除其中一个日志记录框架：

dependencies {
    compile('org.apache.zookeeper:zookeeper:3.4.5') {
        exclude group: 'ch.qos.logback', module: 'logback-classic'
    }
    //...
}

参考：SLF4J说明书

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