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Java Intro to Java Web Development with Spark Diving into Web Development Cookies

Jordan George
Jordan George
9,926 Points
Posted by Jordan George
Jordan George
9,926 Points

"SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder"." error/notification....?

Why am I getting this in red?

"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."

3 Answers

Daniel Springer
Daniel Springer
7,600 Points

are you running dependency spark version 2.3 like craig? or are you using the most up to date version? I was using 2.5 and recieved the same error. The answer was posted a few videos ago i believe but the gist of it was

add

compile 'org.slf4j:slf4j-simple:1.7.21'

to your list of dependencies if it is not already there

Jordan George
Jordan George
9,926 Points
Jordan George
Jordan George
9,926 Points

Thanks! That worked. I am using the most up to date version and added the dependency line.

Lee Haney
Lee Haney
395 Points
Lee Haney
Lee Haney
395 Points

You need to include an slf4j logging implementation in your dependencies.

For gradle, here is what I have for my dependencies:

dependencies {
    compile 'com.sparkjava:spark-core:2.9.3'
    compile group: 'org.slf4j', name: 'slf4j-jdk14', version: '1.7.29'
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.6.0'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine'
}

For maven, this is what I have for my dependencies:

<dependencies>
        <dependency>
            <groupId>com.sparkjava</groupId>
            <artifactId>spark-core</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-jdk14</artifactId>
            <version>1.7.30</version>
        </dependency>
        <dependency>
            <groupId>com.sparkjava</groupId>
            <artifactId>spark-template-handlebars</artifactId>
            <version>2.7.1</version>
        </dependency>
 </dependencies>