public java.util.List<Configuration> getLastSuccessfullyAppliedConfigurations() {
        if (lastSuccessfullyAppliedConfigurations == null) {
            lastSuccessfullyAppliedConfigurations = new com.amazonaws.internal.SdkInternalList<Configuration>();
        }
        return lastSuccessfullyAppliedConfigurations;
    }
<p>
A list of configurations that were successfully applied for an instance group last time.
</p>

@return A list of configurations that were successfully applied for an instance group last time.
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/InstanceGroup.java