Java 没有节点的数据类型：

我已经将我的第一个OneToMany关系添加到我的hibernate 3.6.10项目中。下面是一节课：

/**
 * 
 */
package com.heavyweightsoftware.leal.model.schedule;

import java.util.Collection;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.Table;

import com.heavyweightsoftware.leal.helper.DateHelper;
import com.heavyweightsoftware.leal.model.Pojo;

/**
 * A particular collection of events that can be shared
 * @author Thom
 */
@Entity
@Table(name = "SCHEDULE")
@NamedQueries( {
    @NamedQuery(name = Schedule.COUNT_SCHED_ID,      query =  "SELECT COUNT(*) " +
                                                              "FROM Schedule s " +
                                                              "WHERE s.scheduleId = :scheduleId"),
    @NamedQuery(name = Schedule.COUNT_SCHED_NAME,    query =  "SELECT COUNT(*) " +
                                                              "FROM   ScheduleRole r, Schedule s, SystemUser u " +
                                                              "WHERE  u.email = :email " +
                                                               " AND u.id = r.systemUserId " +
                                                               " AND r.scheduleId = s.id " +
                                                               " AND s.name = :scheduleName "),
    @NamedQuery(name = Schedule.QUERY_EVENTS_BY_USER, query =  "SELECT  r.roleType, s,e " +
                                                               "FROM    Schedule s, ScheduleRole r, SystemUser u " +
                                                               "WHERE   u.email = :email " +
                                                               "  AND   u.id = r.systemUserId " +
                                                               "  AND   r.scheduleId = s.id " +
                                                               " ")
    }
)
public class Schedule extends Pojo {

    public static final int        LENGTH_SCHEDULE_ID        = 32;
    public static final String     COUNT_SCHED_ID            = "countScheduleId";
    public static final String     COUNT_SCHED_NAME          = "countScheduleName";
    public static final String     QUERY_EVENTS_BY_USER      = "findEventsByUser";

    @Column(name = "ID", nullable=false)
    @Id @GeneratedValue(strategy=GenerationType.AUTO)
    private Integer     id;

    @Column(name = "NAME", nullable=false)
    private String      name;

    @Column(name = "SCHEDULE_ID", nullable=false, unique=true, length=LENGTH_SCHEDULE_ID)
    private String      scheduleId;

    @OneToMany(cascade = CascadeType.ALL)
    private Collection<Event>   events;

    /* (non-Javadoc)
     * @see com.heavyweightsoftware.leal.model.Pojo#toString()
     */
    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder(super.toString());
        sb.append('|');
        sb.append(getName());
        sb.append('|');
        sb.append(getScheduleId());
        return sb.toString();
    }

    /* (non-Javadoc)
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = super.hashCode();
        result = prime * result + ((id == null) ? 0 : id.hashCode());
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        result = prime * result
                + ((scheduleId == null) ? 0 : scheduleId.hashCode());
        return result;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (!super.equals(obj))
            return false;
        if (getClass() != obj.getClass())
            return false;
        Schedule other = (Schedule) obj;
        if (id == null) {
            if (other.id != null)
                return false;
        } else if (!id.equals(other.id))
            return false;
        if (name == null) {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        if (scheduleId == null) {
            if (other.scheduleId != null)
                return false;
        } else if (!scheduleId.equals(other.scheduleId))
            return false;
        return true;
    }

    /**
     * @return the id
     */
    public final Integer getId() {
        return id;
    }

    /**
     * @param id the id to set
     */
    public final void setId(Integer id) {
        this.id = id;
    }

    /**
     * @return the name
     */
    public final String getName() {
        return name;
    }

    /**
     * @param name the name to set
     */
    public final void setName(String name) {
        this.name = name;
    }

    /**
     * @return
     */
    public String getScheduleId() {
        return scheduleId == null?scheduleId = DateHelper.getUniqueID():scheduleId;
    }

    /**
     * @param scheduleId
     */
    public void setScheduleId(String scheduleId) {
        this.scheduleId = scheduleId;
    }

    /**
     * @return the events
     */
    public Collection<Event> getEvents() {
        return events;
    }

    /**
     * @param events the events to set
     */
    public void setEvents(Collection<Event> events) {
        this.events = events;
    }
}

我有一些路径问题，我最终解决了。然后我又犯了一个错误

原因：java.lang.IllegalStateException:节点没有数据类型：org.hibernate.hql.ast.tree.IdentNode -[IDENT]IdentNode:'e'{originalText=e}

---

没有此错误的位置，我不知道下一步要去哪里。

我将冒险出去，猜测您忘记了HQL中的新关键字。

在您命名的查询中有e SELECT r.roleType，s，e，但不清楚其引用的位置：

   @NamedQuery(name = Schedule.QUERY_EVENTS_BY_USER, query =  "SELECT  r.roleType, s,e " +
                                                               "FROM    Schedule s, ScheduleRole r, SystemUser u " +
                                                               "WHERE   u.email = :email " +
                                                               "  AND   u.id = r.systemUserId " +
                                                               "  AND   r.scheduleId = s.id " +
                                                               " ")

---

嗯……可能吧。什么新关键字？你能粘贴整个类吗？编辑以添加两个涉及的类。我在nHibernate中遇到了同样的问题，我只从一个表中进行选择，但select中的一个列名碰巧也是另一个nHibernate表的名称。

   @NamedQuery(name = Schedule.QUERY_EVENTS_BY_USER, query =  "SELECT  r.roleType, s,e " +
                                                               "FROM    Schedule s, ScheduleRole r, SystemUser u " +
                                                               "WHERE   u.email = :email " +
                                                               "  AND   u.id = r.systemUserId " +
                                                               "  AND   r.scheduleId = s.id " +
                                                               " ")