public java.util.Map<String, String> getProperties() {
        if (properties == null) {
            properties = new com.amazonaws.internal.SdkInternalMap<String, String>();
        }
        return properties;
    }
<p>
The list of Java properties that are set when the step runs. You can use these properties to pass key-value pairs
to your main function.
</p>

@return The list of Java properties that are set when the step runs. You can use these properties to pass
        key-value pairs to your main function.
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/HadoopStepConfig.java