JPA Hibernate JAXB Lazy инициализация

Question

Я преобразовываю данные таблицы в xml. Я использую jaxb для достижения того же. Я использую одно и то же hibernate pojo для jaxb. Я использую репозиторий JPA для выполнения операций с БД.

Моя таблица пользователей является ссылкой во многих других таблицах. Но мне нужны только данные из таблицы пользователей и ролей. Пользователь Pojo класс приведен ниже:

SEVERE: Servlet.service() for servlet [dispatcher] in context with path [/api] threw exception [Request processing failed; nested exception is org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.mypersonal.model.User.UserAllowedContTypes, no session or session was closed] with root cause 
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.mypersonal.model.User.UserAllowedContTypes, no session or session was closed 
    at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:393) 
    at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:385) 
    at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:378) 
    at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:112) 
    at org.hibernate.collection.internal.PersistentSet.iterator(PersistentSet.java:180) 
    at com.sun.xml.internal.bind.v2.runtime.reflect.Lister$CollectionLister.iterator(Lister.java:267) 
    at com.sun.xml.internal.bind.v2.runtime.reflect.Lister$CollectionLister.iterator(Lister.java:254) 
    at com.sun.xml.internal.bind.v2.runtime.property.ArrayElementProperty.serializeListBody(ArrayElementProperty.java:118) 
    at com.sun.xml.internal.bind.v2.runtime.property.ArrayERProperty.serializeBody(ArrayERProperty.java:144) 
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:343) 
    at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:685) 
    at com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty.serializeBody(SingleElementNodeProperty.java:143) 
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:343) 
    at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsSoleContent(XMLSerializer.java:582) 
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeRoot(ClassBeanInfoImpl.java:325) 
    at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:483) 
    at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:308) 
    at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:236) 
    at org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter.writeToResult(Jaxb2RootElementHttpMessageConverter.java:96) 
    at org.springframework.http.converter.xml.AbstractXmlHttpMessageConverter.writeInternal(AbstractXmlHttpMessageConverter.java:66) 
    at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:179) 
    at 







@Entity 
@Table(name = "user") 
@XmlRootElement(name = "user") 
@XmlAccessorType(XmlAccessType.FIELD) 
public class User implements Cloneable, Serializable { 

    /** Serial Version UID. */ 
    private static final long serialVersionUID = -558971439L; 

    /** Use a WeakHashMap so entries will be garbage collected once all entities 
     referring to a saved hash are garbage collected themselves. */ 
    private static final Map<Serializable, Integer> SAVED_HASHES = 
     Collections.synchronizedMap(new WeakHashMap<Serializable, Integer>()); 

    /** hashCode temporary storage. */ 
    private volatile Integer hashCode; 


    /** Field mapping. */ 
    @XmlElement(name = "activeStatus") 
    private String activeStatus; 
    /** Field mapping. */ 
    private String address; 
    /** Field mapping. */ 
    private String allowdrmcontent; 
    /** Field mapping. */ 
    private String city; 
    /** Field mapping. */ 
    private Set<CmsUserAllowedContType> cmsUserAllowedContTypes = new HashSet<CmsUserAllowedContType>(); 

    /** Field mapping. */ 
    private Set<CmsUserFtpDetails> cmsUserFtpDetailss = new HashSet<CmsUserFtpDetails>(); 



    /** Field mapping. */ 
    private String createdBy; 
    /** Field mapping. */ 
    private Date createdOn; 
    /** Field mapping. */ 
    private String email; 
    /** Field mapping. */ 
    private String firstName; 
    /** Field mapping. */ 
    private PublishingGroup fkPublisher; 
    /** Field mapping. */ 
    @XmlElement(name = "role") 
    private CmsRoleMaster fkRole; 
    /** Field mapping. */ 
    @XmlElement(name = "id") 
    private Integer id = 0; // init for hibernate bug workaround 
    /** Field mapping. */ 
    private String lastName; 
    /** Field mapping. */ 
    private Date modifiedOn; 
    /** Field mapping. */ 
    private String password; 
    /** Field mapping. */ 
    private Long phoneNumber; 
    /** Field mapping. */ 
    private Integer pincode; 
    /** Field mapping. */ 
    @XmlElement(name = "username") 
    private String username; 


    @Basic(optional = true) 
    @Column(name = "active_status" ) 
    public String getActiveStatus() { 
     return this.activeStatus; 

    } 

    public void setActiveStatus(final String activeStatus) { 
     this.activeStatus = activeStatus; 
    } 


    @Basic(optional = true) 
    @Column(length = 45 ) 
    public String getAddress() { 
     return this.address; 

    } 

    public void setAddress(final String address) { 
     this.address = address; 
    } 


    @Basic(optional = true) 
    @Column(length = 45 ) 
    public String getAllowdrmcontent() { 
     return this.allowdrmcontent; 

    } 

    public void setAllowdrmcontent(final String allowdrmcontent) { 
     this.allowdrmcontent = allowdrmcontent; 
    } 


    @Basic(optional = true) 
    @Column(length = 45 ) 
    public String getCity() { 
     return this.city; 

    } 

    public void setCity(final String city) { 
     this.city = city; 
    } 

    @OneToMany(fetch = FetchType.LAZY, cascade = { CascadeType.PERSIST, CascadeType.MERGE }, mappedBy = "fkUser" ) 
    @org.hibernate.annotations.Cascade({org.hibernate.annotations.CascadeType.SAVE_UPDATE}) 
    @Basic(optional = true) 
    @Column(nullable = true ) 
    public Set<CmsUserAllowedContType> getCmsUserAllowedContTypes() { 
     return this.cmsUserAllowedContTypes; 

    } 


    public void addCmsUserAllowedContType(CmsUserAllowedContType cmsUserAllowedContType) { 
     cmsUserAllowedContType.setFkUser(this); 
     this.cmsUserAllowedContTypes.add(cmsUserAllowedContType); 
    } 


    public void setCmsUserAllowedContTypes(final Set<CmsUserAllowedContType> cmsUserAllowedContType) { 
     this.cmsUserAllowedContTypes = cmsUserAllowedContType; 
    } 

    @OneToMany(fetch = FetchType.LAZY, cascade = { CascadeType.PERSIST, CascadeType.MERGE }, mappedBy = "fkCmsUser" ) 
    @org.hibernate.annotations.Cascade({org.hibernate.annotations.CascadeType.SAVE_UPDATE}) 
    @Basic(optional = true) 
    @Column(nullable = true ) 
    public Set<CmsUserFtpDetails> getCmsUserFtpDetailss() { 
     return this.cmsUserFtpDetailss; 

    } 


    public void addCmsUserFtpDetails(CmsUserFtpDetails cmsUserFtpDetails) { 
     cmsUserFtpDetails.setFkCmsUser(this); 
     this.cmsUserFtpDetailss.add(cmsUserFtpDetails); 
    } 

    public void setCmsUserFtpDetailss(final Set<CmsUserFtpDetails> cmsUserFtpDetails) { 
     this.cmsUserFtpDetailss = cmsUserFtpDetails; 
    } 



    @Basic(optional = true) 
    @Column(length = 45 ) 
    public String getCountry() { 
     return this.country; 

    } 

    public void setCountry(final String country) { 
     this.country = country; 
    } 

    @Basic(optional = false) 
    @Column(name = "created_by", nullable = false, length = 45 ) 
    public String getCreatedBy() { 
     return this.createdBy; 

    } 



    /** 
    * Set the value related to the column: createdBy. 
    * @param createdBy the createdBy value you wish to set 
    */ 
    public void setCreatedBy(final String createdBy) { 
     this.createdBy = createdBy; 
    } 

    /** 
    * Return the value associated with the column: createdOn. 
    * @return A Date object (this.createdOn) 
    */ 
    @Basic(optional = true) 
    @Column(name = "created_on" ) 
    public Date getCreatedOn() { 
     return this.createdOn; 

    } 



    /** 
    * Set the value related to the column: createdOn. 
    * @param createdOn the createdOn value you wish to set 
    */ 
    public void setCreatedOn(final Date createdOn) { 
     this.createdOn = createdOn; 
    } 

    /** 
    * Return the value associated with the column: email. 
    * @return A String object (this.email) 
    */ 
    @Basic(optional = false) 
    @Column(nullable = false, length = 45 ) 
    public String getEmail() { 
     return this.email; 

    } 



    /** 
    * Set the value related to the column: email. 
    * @param email the email value you wish to set 
    */ 
    public void setEmail(final String email) { 
     this.email = email; 
    } 

    /** 
    * Return the value associated with the column: firstName. 
    * @return A String object (this.firstName) 
    */ 
    @Basic(optional = false) 
    @Column(name = "first_name", nullable = false, length = 30 ) 
    public String getFirstName() { 
     return this.firstName; 

    } 



    /** 
    * Set the value related to the column: firstName. 
    * @param firstName the firstName value you wish to set 
    */ 
    public void setFirstName(final String firstName) { 
     this.firstName = firstName; 
    } 


    @ManyToOne(cascade = { CascadeType.PERSIST, CascadeType.MERGE }, fetch = FetchType.LAZY) 
    @org.hibernate.annotations.Cascade({org.hibernate.annotations.CascadeType.SAVE_UPDATE}) 
    @Basic(optional = false) 
    @JoinColumn(name = "fk_role_id", nullable = false) 
    public CmsRoleMaster getFkRole() { 
     return this.fkRole; 

    } 

    public void setFkRole(final CmsRoleMaster fkRole) { 
     this.fkRole = fkRole; 
    } 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    @Basic(optional = false) 
    @Column(name = "id", nullable = false ) 
    public Integer getId() { 
     return this.id; 

    } 

    public void setId(final Integer id) { 
     // If we've just been persisted and hashCode has been 
     // returned then make sure other entities with this 
     // ID return the already returned hash code 
     if ((this.id == null || this.id == 0) && 
       (id != null) && 
       (this.hashCode != null)) { 
     SAVED_HASHES.put(id, this.hashCode); 
     } 
     this.id = id; 
    } 

    @Basic(optional = false) 
    @Column(name = "last_name", nullable = false, length = 30 ) 
    public String getLastName() { 
     return this.lastName; 

    } 

    public void setLastName(final String lastName) { 
     this.lastName = lastName; 
    } 

    @Basic(optional = true) 
    @Column(name = "modified_on" ) 
    public Date getModifiedOn() { 
     return this.modifiedOn; 

    } 

    public void setModifiedOn(final Date modifiedOn) { 
     this.modifiedOn = modifiedOn; 
    } 

    @Basic(optional = false) 
    @Column(nullable = false, length = 45 ) 
    public String getPassword() { 
     return this.password; 

    } 

    public void setPassword(final String password) { 
     this.password = password; 
    } 

    @Basic(optional = true) 
    @Column(name = "phone_number" ) 
    public Long getPhoneNumber() { 
     return this.phoneNumber; 

    } 

    public void setPhoneNumber(final Long phoneNumber) { 
     this.phoneNumber = phoneNumber; 
    } 

    public Integer getPincode() { 
     return this.pincode; 

    } 

    public void setPincode(final Integer pincode) { 
     this.pincode = pincode; 
    } 

    @Basic(optional = false) 
    @Column(nullable = false, length = 45 ) 
    public String getUsername() { 
     return this.username; 

    } 

    public void setUsername(final String username) { 
     this.username = username; 
    } 

} 

Answer 1

Вам нужен текущий сеанс и активная транзакция, так что может быть загружена лениво коллекция. Альтернативно, измените режим загрузки коллекции на желаемую выборку.