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How do I set up the configuration of slf4j?

You need to add a log4j-test.properties under the directory of java test and then add the following snippets into your build.gradle file.

test {
  systemProperty "log4j.configuration", "log4j-test.properties"
}

dependencies {
  shadow library.java.slf4j_api
  shadow library.java.slf4j_log4j12
  // or shadow library.java.slf4j_jdk14
}

Please note that the second dependency shadow library.java.slf4j_log4j12 is not necessary if this dependency is already provided by other library. You can check the dependency tree by launching ./gradlew dependencies to see if it has been included.

If you encounter the error message like this: 

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation

It means that no SLF4J binding is found. So you need to add library.java.slf4j_log4j12 or library.java.slf4j_jdk14 in build.gradle file.

How do I automatically format code and avoid spotless errors?

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If it is just a simple runner like directRunner, all you need to do is to put your pipeline code under example folder, and then add following build target to the related build.gradle: 

There are also alternative choices, with slight difference:

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