我有两个类,它们之间有关系。这些都是
com.edfx.adb.persist.Activity
:
package com.edfx.adb.persist.entity;
import java.util.List;
import javax.persistence.Column;
import javax.persistence.FetchType;
import javax.persistence.JoinColumn;
import javax.persistence.Lob;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.Transient;
import org.hibernate.annotations.Cascade;
import org.hibernate.annotations.CascadeType;
import org.hibernate.annotations.NaturalId;
@javax.persistence.Entity
@Table(name = "ACTIVITY")
public class Activity extends Entity {
@Transient
private static final long serialVersionUID = 4741665931936809028L;
private String activityId;
private String activityName;
private String activityDescription;
private Customer customer;
private ActivityType activityType;
private boolean active;
private Double mandays;
private Double price;
private String manager;
private List<Participation> participations;
public Activity() {
super();
}
@NaturalId
@Column(name = "ACTIVITY_ID", nullable = false)
public String getActivityId() {
return activityId;
}
public void setActivityId(String activityId) {
this.activityId = activityId;
}
@Lob
@Column(name = "ACTIVITY_NAME", nullable = false)
public String getActivityName() {
return activityName;
}
public void setActivityName(String activityName) {
this.activityName = activityName;
}
@Lob
@Column(name = "ACTIVITY_DESCRIPTION", nullable = false)
public String getActivityDescription() {
return activityDescription;
}
public void setActivityDescription(String activityDescription) {
this.activityDescription = activityDescription;
}
@ManyToOne
@JoinColumn(name = "CUSTOMER_ID", nullable = false)
public Customer getCustomer() {
return customer;
}
public void setCustomer(Customer customer) {
this.customer = customer;
}
@ManyToOne
@JoinColumn(name = "ACTIVITY_TYPE_ID", nullable = false)
public ActivityType getActivityType() {
return activityType;
}
public void setActivityType(ActivityType activityType) {
this.activityType = activityType;
}
@Column(name = "ACTIVE", nullable = false)
public boolean isActive() {
return active;
}
public void setActive(boolean active) {
this.active = active;
}
@Column(name = "MANDAYS")
public Double getMandays() {
return mandays;
}
public void setMandays(Double mandays) {
this.mandays = mandays;
}
@Column(name = "PRICE")
public Double getPrice() {
return price;
}
public void setPrice(Double price) {
this.price = price;
}
@Column(name = "CUSTOMER_SIDE_MANAGER")
public String getManager() {
return manager;
}
public void setManager(String manager) {
this.manager = manager;
}
@OneToMany(mappedBy = "activity", fetch = FetchType.LAZY)
@Cascade(CascadeType.SAVE_UPDATE)
public List<Participation> getParticipations() {
return participations;
}
public void setParticipations(List<Participation> participations) {
this.participations = participations;
}
}
com.edfx.adb.persist.ActivityType
:
package com.edfx.adb.persist.entity;
import javax.persistence.Column;
import javax.persistence.Table;
import javax.persistence.Transient;
@javax.persistence.Entity
@Table(name = "ACTIVITY_TYPE")
public class ActivityType extends Entity {
@Transient
private static final long serialVersionUID = 2322745769010162801L;
private String parent;
private String name;
private String activityId;
public ActivityType() {
}
@Column(name = "PARENT", nullable = false)
public String getParent() {
return parent;
}
public void setParent(String parent) {
this.parent = parent;
}
@Column(name = "NAME", nullable = false)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Column(name = "ACTIVITY_ID", nullable = false)
public String getActivityId() {
return activityId;
}
public void setActivityId(String activityId) {
this.activityId = activityId;
}
}
它们都扩展了com.edfx.adb.persist.entity.Entity
:
package com.edfx.adb.persist.entity;
import java.io.Serializable;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.Transient;
import javax.persistence.Version;
import org.hibernate.proxy.HibernateProxyHelper;
@MappedSuperclass
public class Entity implements Serializable {
@Transient
private static final long serialVersionUID = 7470288121057059283L;
private Long id;
private Date createTimestamp;
private Date lastUpdateTimestamp;
private Long version;
public Entity() {
super();
}
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "ID", updatable = false, nullable = false, unique = true)
public Long getId() {
return id;
}
@SuppressWarnings("unused")
private void setId(Long id) {
this.id = id;
}
@Temporal(TemporalType.TIMESTAMP)
@Column(name = "CREATE_TIMESTAMP")
public Date getCreateTimestamp() {
return createTimestamp;
}
public void setCreateTimestamp(Date createTimestamp) {
this.createTimestamp = createTimestamp;
}
@Temporal(TemporalType.TIMESTAMP)
@Column(name = "LAST_UPDATE_TIMESTAMP")
public Date getLastUpdateTimestamp() {
return lastUpdateTimestamp;
}
public void setLastUpdateTimestamp(Date lastUpdateTimestamp) {
this.lastUpdateTimestamp = lastUpdateTimestamp;
}
@Version
@Column(name = "VERSION")
public Long getVersion() {
return version;
}
@SuppressWarnings("unused")
private void setVersion(Long version) {
this.version = version;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
return prime * result + ((getId() == null) ? super.hashCode() : getId().hashCode());
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (!getClass().equals(HibernateProxyHelper.getClassWithoutInitializingProxy(obj))) {
return false;
}
final Entity other = (Entity) obj;
if (getId() != other.getId()) {
if (getId() == null) {
return false;
}
if (!getId().equals(other.getId())) {
return false;
}
}
return true;
}
}
现在我正在使用 Primefaces 数据表来显示List<Activity>
我name
在ActivityType
. 按关系ActivityType
关联。Activity
@ManyToOne
为了过滤List<Activity>
我正在使用的:
Criteria criteria = getSessionFactory().getCurrentSession().createCriteria(Activity.class);
criteria.createCriteria("activityType").add(Restrictions.like("name", value.toString(), MatchMode.START));
我正进入(状态:
null: org.hibernate.QueryException: duplicate association path: activityType
at org.hibernate.loader.criteria.CriteriaQueryTranslator.createAssociationPathCriteriaMap(CriteriaQueryTranslator.java:172) [hibernate-core-4.1.8.Final.jar:4.1.8.Final]
at org.hibernate.loader.criteria.CriteriaQueryTranslator.<init>(CriteriaQueryTranslator.java:111) [hibernate-core-4.1.8.Final.jar:4.1.8.Final]
at org.hibernate.loader.criteria.CriteriaLoader.<init>(CriteriaLoader.java:84) [hibernate-core-4.1.8.Final.jar:4.1.8.Final]
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1602) [hibernate-core-4.1.8.Final.jar:4.1.8.Final]
at org.hibernate.internal.CriteriaImpl.list(CriteriaImpl.java:374) [hibernate-core-4.1.8.Final.jar:4.1.8.Final]
at com.edfx.adb.dao.ActivityDao.loadActivities(ActivityDao.java:54) [classes:]
at com.edfx.adb.service.ActivityService.loadActivities(ActivityService.java:101) [classes:]
在第一次加载后,此错误并非总是显示,也不会显示。在过滤表格 5-6 次后,我遇到了这个错误。
我担心映射和标准是否正确。任何建议都会非常有帮助。