我正在将表数据转换为xml。我正在使用jaxb来实现同样的目标。我也在为jaxb使用相同的hibernate pojo。我正在使用JPA存储库来执行数据库操作。
我的用户表是许多其他表中的引用。但我只想要来自用户和角色表的数据。用户Pojo类如下：
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;
}
}
答案 0 :(得分：0)
您需要当前会话和活动事务，以便可以延迟加载集合。或者，将集合的加载模式更改为急切提取。