public void setConfigurations(java.util.Collection<Configuration> configurations) {
        if (configurations == null) {
            this.configurations = null;
            return;
        }

        this.configurations = new com.amazonaws.internal.SdkInternalList<Configuration>(configurations);
    }
<p>
A configuration classification that applies when provisioning cluster instances, which can include configurations
for applications and software bundled with Amazon EMR.
</p>

@param configurations
       A configuration classification that applies when provisioning cluster instances, which can include
       configurations for applications and software bundled with Amazon EMR.
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/InstanceTypeSpecification.java