<BUG>import java.util.List;import org.apache.commons.lang3.Validate;</BUG><CONTEXT>package com.cronutils.model.time.generator;import java.util.Collections;<extra_id_0>import com.cronutils.model.field.CronField;import com.cronutils.model.field.expression.FieldExpression;public abstract class FieldValueGenerator {</CONTEXT>
import org.apache.commons.lang3.Validate;import org.apache.commons.lang3.Validate;