IllegalArgumentException occurred calling getter of com.vote.entity.vote_subject

[hero_tan]

Vote_Subject

/**
 * 投票内容
 * 
 * @author Tan
 * 
 */
public class vote_subject {

	private Integer vs_id;
	private String vs_title;
	private Integer vs_type;
	private Set<vote_option> options = new HashSet<vote_option>();

	public vote_subject() {
	}

	public vote_subject(Integer vs_id, String vs_title, int vs_type) {
		this.vs_id = vs_id;
		this.vs_title = vs_title;
		this.vs_type = vs_type;
	}

	/**
	 * 
	 * @return ID
	 */
	public Integer getVs_id() {
		return vs_id;
	}

	public void setVs_id(Integer vs_id) {
		this.vs_id = vs_id;
	}

	/**
	 * 
	 * 
	 * @return 投票内容
	 */
	public String getVs_title() {
		return vs_title;
	}

	public void setVs_title(String vs_title) {
		this.vs_title = vs_title;
	}

	/**
	 * 
	 * 
	 * @return 投票类型
	 */
	public Integer getVs_type() {
		return vs_type;
	}

	public void setVs_type(Integer vs_type) {
		//投票类型      1:单选       2:多选          默认：1
		if (vs_type == 1 || vs_type == 2) {
			this.vs_type = vs_type;
		}else{
			vs_type=1;
		}
	}



	/**
	 *
	 * @return
	 */

	public Set<vote_option> getOptions() {
		return options;
	}

	public void setOptions(Set<vote_option> options) {
		this.options = options;
	}

Vote_option

public class vote_option {
	private Integer vo_id;
	private String vo_option;
	private vote_subject vs_id;
	private String vo_order;

	public vote_option() {
	}

	public vote_option(Integer vo_id, String vo_option, vote_subject vs_id,
			String vo_order) {
		this.vo_id = vo_id;
		this.vo_option = vo_option;
		this.vs_id = vs_id;
		this.vo_order = vo_order;
	}

	/**
	 * 
	 * @return ID
	 */
	public Integer getVo_id() {
		return vo_id;
	}

	public void setVo_id(Integer vo_id) {
		this.vo_id = vo_id;
	}

	/**
	 * 投票选项 
	 * @return
	 */
	public String getVo_option() {
		return vo_option;
	}

	public void setVo_option(String vo_option) {
		this.vo_option = vo_option;
	}

	/**
	 * 投票内容ID
	 * @return
	 */
	public vote_subject getVs_id() {
		return vs_id;
	}

	public void setVs_id(vote_subject vs_id) {
		this.vs_id = vs_id;
	}

	/**
	 * 显示顺序
	 * @return
	 */
	public String getVo_order() {
		return vo_order;
	}

	public void setVo_order(String vo_order) {
		this.vo_order = vo_order;
	}

Action

public class vote_subjectAction extends ActionSupport {
	private vote_subject subject = new vote_subject(); // 投票
	private String[] options;  //选项
	
	public String[] getOptions() {
		return options;
	}

	public void setOptions(String[] options) {
		this.options = options;
	}

	/* 实例化*/
	private vote_subjectServicesDao sdao = new vote_subjectServicesDaoImpl();

	public vote_subject getSubject() {
		return subject;
	}

	public void setSubject(vote_subject subject) {
		this.subject = subject;
	}
	/**
	 * 添加投票
	 * 
	 * @return
	 * @throws Exception
	 */
	public String save() throws Exception {
		//选项
		String[] order={"A","B","C","D","E","F"};
		try {
			for(int i=0;i<this.options.length;i++){
				vote_option op = new vote_option();
				op.setVo_option(this.options[i]);/*选项*/
				op.setVo_order(order[i]);  /*排序*/
				op.setVs_id(this.subject);  
				this.subject.getOptions().add(op);
				sdao.save(this.subject);
			}
			return SUCCESS;
		} catch (Exception e) {
			e.printStackTrace();
			return ERROR;
		}
	}

双向一对多的关联关系 ‘
映射文件

Vote_Subject.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
	<class name="com.vote.entity.vote_subject" table="vote_subject">
		<id name="vs_id" type="java.lang.Integer">
			<column name="vs_id"></column>
			<generator class="increment"></generator>
		</id>
		
		<property name="vs_title" type="java.lang.String">
			<column name="vs_title"></column>
		</property>
		
		<property name="vs_type" type="java.lang.Integer">
			<column name="vs_type"></column>
		</property>
		
		<set name="options" table="vote_option" cascade="all" lazy="false" inverse="false">
			<key>
				<column name="vs_id"></column>
			</key>
			<one-to-many class="com.vote.entity.vote_subject"/>
		</set>
	</class>
</hibernate-mapping>

’

Vote_Option.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
	<class name="com.vote.entity.vote_option" table="vote_option">
		<id name="vo_id" type="java.lang.Integer">
			<column name="vo_id"></column>
			<generator class="increment"></generator>
		</id>
		
		<property name="vo_option" type="java.lang.String">
			<column name="vo_option"></column>
		</property>
		
		<many-to-one name="vs_id" class="com.vote.entity.vote_subject">
			<column name="vs_id"></column>
		</many-to-one>
		
		<property name="vo_order" type="java.lang.String">
			<column name="vo_order"></column>
		</property>
	</class>
</hibernate-mapping>

错误信息:

[能源恒观]

实体类映射的问题，你看看vs_id这个映射有没有问题