SLF4J:无法加载类"org.slf4j.impl.StaticLoggerBinder".在Maven项目中

Question

我对SLF4J有依赖性.我收到此错误:

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.

这是我的maven条目:

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.6.6</version>
    </dependency>

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.6.6</version>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.16</version>
    </dependency>

问题出在哪儿？

---

编辑: 没有log4j依赖我得到以下异常

Failed to instantiate SLF4J LoggerFactory
Reported exception:
java.lang.NoClassDefFoundError: org.slf4j.impl.StaticLoggerBinder
    at org.slf4j.LoggerFactory.bind(LoggerFactory.java:121)
    at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:111)
    at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:268)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:241)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:254)
    at org.apache.bval.jsr303.ConfigurationImpl.<clinit>(ConfigurationImpl.java:50)
    at java.lang.J9VMInternals.initializeImpl(Native Method)
    at java.lang.J9VMInternals.initialize(J9VMInternals.java:228)
    at org.apache.bval.jsr303.ApacheValidationProvider.createGenericConfiguration(ApacheValidationProvider.java:66)
    at javax.validation.Validation$GenericBootstrapImpl.configure(Validation.java:173)
    at javax.validation.Validation.buildDefaultValidatorFactory(Validation.java:50)
    at com.daimler.zv9.basic.entity.AbstractEntity.<clinit>(AbstractEntity.java:73)
    at java.lang.J9VMInternals.initializeImpl(Native Method)
    at java.lang.J9VMInternals.initialize(J9VMInternals.java:228)
    at java.lang.J9VMInternals.initialize(J9VMInternals.java:195)
    at java.lang.Class.forNameImpl(Native Method)
    at java.lang.Class.forName(Class.java:168)

---

EDIT2:这是我得到的一个例子MAVEN Tree

[INFO] com.myCompany.abc:ABC_Document:ejb:0.0.1-SNAPSHOT
[INFO] +- com.myCompany.abc:ABC_Basic:jar:0.0.1-SNAPSHOT:compile
[INFO] +- com.myCompany.iap:javax.j2ee:jar:5.0.0:provided
[INFO] +- com.myCompany.iap:logging:jar:5.0.0:provided
[INFO] +- com.myCompany.iap:util:jar:5.0.0:provided
[INFO] +- junit:junit:jar:4.8.2:test
[INFO] +- javax.servlet:jstl:jar:1.2:provided
[INFO] +- org.slf4j:slf4j-api:jar:1.6.6:compile
[INFO] +- org.slf4j:slf4j-simple:jar:1.6.6:compile
[INFO] \- org.mockito:mockito-all:jar:1.9.0:test

Answer 1

我假设您使用Eclipse作为您的开发环境.

使用捆绑的maven版本(m2e)时,Eclipse Juno,Indigo和Kepler不会抑制消息SLF4J:无法加载类"org.slf4j.impl.StaticLoggerBinder".此行为存在于m2e版本1.1.0.20120530-0009及之后.

虽然,这表示为错误,您的日志将正常保存.在修复此错误之前,突出显示的错误仍然存​​在.有关m2e支持网站的更多信息.

当前可用的解决方案是使用外部maven版本而不是捆绑的Eclipse版本.您可以在下面的问题中找到有关此错误的此解决方案和更多详细信息,我相信这些错误描述了您所面临的同一问题.

SLF4J:无法加载类"org.slf4j.impl.StaticLoggerBinder".错误

Answer 2

去掉

<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.16</version>
</dependency> 

slf4j-log4j12是slf4j你的log4j绑定不需要添加另一个log4j依赖项.

添加
提供log4j配置log4j.properties并将其添加到类路径中.有样品的配置在这里

或者你可以改变你的绑定

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-simple</artifactId>
    <version>1.6.1</version>
</dependency>

如果你正在配置slf4j由于某些依赖需要它.

Answer 3

我在IntelliJ中碰到了这个并通过在我的pom中添加以下内容来修复它:

<!-- logging dependencies -->
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>${logback.version}</version>
        <exclusions>
            <exclusion>
                <!-- Defined below -->
                <artifactId>slf4j-api</artifactId>
                <groupId>org.slf4j</groupId>
            </exclusion>
        </exclusions>
    </dependency>

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>${slf4j.version}</version>
    </dependency>