2
서버로 실행할 때 응용 프로그램을 실행할 때 오류가 발생합니다. 그 이유를 알고 있습니다.Tomcat HTTP 상태 500 - 프록시를 초기화 할 수 없음 - 세션 없음
HTTP Status 500 - could not initialize proxy - no Session (through reference chain: java.util.ArrayList[0]->it.jack.fdd.model.Staff["staffType"]->it.jack.fdd.model.StaffType_$$_jvstbaa_15["type"])
type Exception report
message could not initialize proxy - no Session (through reference chain: java.util.ArrayList[0]->it.jack.fdd.model.Staff["staffType"]->it.jack.fdd.model.StaffType_$$_jvstbaa_15["type"])
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.codehaus.jackson.map.JsonMappingException: could not initialize proxy - no Session (through reference chain: java.util.ArrayList[0]->it.jack.fdd.model.Staff["staffType"]->it.jack.fdd.model.StaffType_$$_jvstbaa_15["type"])
\t org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:218)
\t org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:183)
\t org.codehaus.jackson.map.ser.std.SerializerBase.wrapAndThrow(SerializerBase.java:140)
\t org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:158)
\t org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112)
\t org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:446)
\t org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:150)
\t org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112)
\t org.codehaus.jackson.map.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:72)
\t org.codehaus.jackson.map.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:23)
\t org.codehaus.jackson.map.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:86)
\t org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:659)
\t org.codehaus.jackson.map.ser.StdSerializerProvider.serializeValue(StdSerializerProvider.java:271)
\t org.codehaus.jackson.map.ObjectWriter.writeValue(ObjectWriter.java:325)
\t org.codehaus.jackson.jaxrs.JacksonJsonProvider.writeTo(JacksonJsonProvider.java:556)
\t com.sun.jersey.json.impl.provider.entity.JacksonProviderProxy.writeTo(JacksonProviderProxy.java:160)
\t com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:302)
\t com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1510)
\t com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)
\t com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)
\t com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)
\t com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558)
\t com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733)
\t javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
\t org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
org.hibernate.LazyInitializationException: could not initialize proxy - no Session
\t org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:165)
\t org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:286)
\t org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:185)
\t it.jack.fdd.model.StaffType_$$_jvstbaa_15.getType(StaffType_$$_jvstbaa_15.java)
\t sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
\t sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
\t sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
\t java.lang.reflect.Method.invoke(Method.java:497)
\t org.codehaus.jackson.map.ser.BeanPropertyWriter.get(BeanPropertyWriter.java:483)
\t org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:418)
\t org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:150)
\t org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112)
\t org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:446)
\t org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:150)
\t org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112)
\t org.codehaus.jackson.map.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:72)
\t org.codehaus.jackson.map.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:23)
\t org.codehaus.jackson.map.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:86)
\t org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:659)
\t org.codehaus.jackson.map.ser.StdSerializerProvider.serializeValue(StdSerializerProvider.java:271)
\t org.codehaus.jackson.map.ObjectWriter.writeValue(ObjectWriter.java:325)
\t org.codehaus.jackson.jaxrs.JacksonJsonProvider.writeTo(JacksonJsonProvider.java:556)
\t com.sun.jersey.json.impl.provider.entity.JacksonProviderProxy.writeTo(JacksonProviderProxy.java:160)
\t com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:302)
\t com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1510)
\t com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)
\t com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)
\t com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)
\t com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558)
\t com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733)
\t javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
\t org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)그것을 체크 아웃 : 이것은 내 오류가 나는 두 모델 클래스, 내 데이터베이스의 두 테이블 조인을 가지고 있기 때문입니다 java.util.ArrayList[0]->it.jack.fdd.model.Staff["staffType"]->it.jack.fdd.model.StaffType_$$_jvstbaa_15["type"])
,이 두 클래스는 다음과 같습니다
Staff.java :
package it.jack.fdd.model;
// Generated 30-nov-2016 0.17.09 by Hibernate Tools 4.3.1.Final
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.xml.bind.annotation.XmlRootElement;
import org.codehaus.jackson.annotate.JsonIgnore;
/**
* Staff generated by hbm2java
*/
@XmlRootElement
@Entity
@Table(name = "staff", catalog = "fdd_dbproducts")
public class Staff implements java.io.Serializable {
\t private Integer idstaff;
\t private StaffType staffType;
\t private String name;
\t private String surname;
\t private Date birthDate;
\t private String phone;
\t private boolean gender;
\t private StaffLogin staffLogin;
\t private Set<RtStaffDispenser> rtStaffDispensers = new HashSet<RtStaffDispenser>(0);
\t public Staff() {
\t }
\t public Staff(StaffType staffType, String name, String surname, Date birthDate, String phone, boolean gender) {
\t \t this.staffType = staffType;
\t \t this.name = name;
\t \t this.surname = surname;
\t \t this.birthDate = birthDate;
\t \t this.phone = phone;
\t \t this.gender = gender;
\t }
\t public Staff(StaffType staffType, String name, String surname, Date birthDate, String phone, boolean gender,
\t \t \t StaffLogin staffLogin, Set<RtStaffDispenser> rtStaffDispensers) {
\t \t this.staffType = staffType;
\t \t this.name = name;
\t \t this.surname = surname;
\t \t this.birthDate = birthDate;
\t \t this.phone = phone;
\t \t this.gender = gender;
\t \t this.staffLogin = staffLogin;
\t \t this.rtStaffDispensers = rtStaffDispensers;
\t }
\t @Id
\t @GeneratedValue(strategy = IDENTITY)
\t @Column(name = "idstaff", unique = true, nullable = false)
\t public Integer getIdstaff() {
\t \t return this.idstaff;
\t }
\t public void setIdstaff(Integer idstaff) {
\t \t this.idstaff = idstaff;
\t }
\t @ManyToOne(fetch = FetchType.LAZY)
\t @JoinColumn(name = "fkstaff_type_staff", nullable = false)
\t @JsonIgnore
\t public StaffType getStaffType() {
\t \t return this.staffType;
\t }
\t public void setStaffType(StaffType staffType) {
\t \t this.staffType = staffType;
\t }
\t @Column(name = "name", nullable = false, length = 45)
\t public String getName() {
\t \t return this.name;
\t }
\t public void setName(String name) {
\t \t this.name = name;
\t }
\t @Column(name = "surname", nullable = false, length = 45)
\t public String getSurname() {
\t \t return this.surname;
\t }
\t public void setSurname(String surname) {
\t \t this.surname = surname;
\t }
\t @Temporal(TemporalType.DATE)
\t @Column(name = "birth_date", nullable = false, length = 10)
\t public Date getBirthDate() {
\t \t return this.birthDate;
\t }
\t public void setBirthDate(Date birthDate) {
\t \t this.birthDate = birthDate;
\t }
\t @Column(name = "phone", nullable = false, length = 45)
\t public String getPhone() {
\t \t return this.phone;
\t }
\t public void setPhone(String phone) {
\t \t this.phone = phone;
\t }
\t @Column(name = "gender", nullable = false)
\t public boolean isGender() {
\t \t return this.gender;
\t }
\t public void setGender(boolean gender) {
\t \t this.gender = gender;
\t }
\t @OneToOne(fetch = FetchType.LAZY, mappedBy = "staff")
\t @JsonIgnore
\t public StaffLogin getStaffLogin() {
\t \t return this.staffLogin;
\t }
\t public void setStaffLogin(StaffLogin staffLogin) {
\t \t this.staffLogin = staffLogin;
\t }
\t @OneToMany(fetch = FetchType.LAZY, mappedBy = "staff")
\t @JsonIgnore
\t public Set<RtStaffDispenser> getRtStaffDispensers() {
\t \t return this.rtStaffDispensers;
\t }
\t public void setRtStaffDispensers(Set<RtStaffDispenser> rtStaffDispensers) {
\t \t this.rtStaffDispensers = rtStaffDispensers;
\t }
}및 StaffType.java :
package it.jack.fdd.model;
// Generated 30-nov-2016 0.17.09 by Hibernate Tools 4.3.1.Final
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.xml.bind.annotation.XmlRootElement;
import org.codehaus.jackson.annotate.JsonIgnore;
/**
* StaffType generated by hbm2java
*/
@XmlRootElement
@Entity
@Table(name = "staff_type", catalog = "fdd_dbproducts")
public class StaffType implements java.io.Serializable {
\t private Integer idstaffType;
\t private String type;
\t private Set<Staff> staffs = new HashSet<Staff>(0);
\t public StaffType() {
\t }
\t public StaffType(String type) {
\t \t this.type = type;
\t }
\t public StaffType(String type, Set<Staff> staffs) {
\t \t this.type = type;
\t \t this.staffs = staffs;
\t }
\t @Id
\t @GeneratedValue(strategy = IDENTITY)
\t @Column(name = "idstaff_type", unique = true, nullable = false)
\t public Integer getIdstaffType() {
\t \t return this.idstaffType;
\t }
\t public void setIdstaffType(Integer idstaffType) {
\t \t this.idstaffType = idstaffType;
\t }
\t @Column(name = "type", nullable = false, length = 45)
\t public String getType() {
\t \t return this.type;
\t }
\t public void setType(String type) {
\t \t this.type = type;
\t }
\t @OneToMany(fetch = FetchType.LAZY, mappedBy = "staffType")
\t @JsonIgnore
\t public Set<Staff> getStaffs() {
\t \t return this.staffs;
\t }
\t public void setStaffs(Set<Staff> staffs) {
\t \t this.staffs = staffs;
\t }
}내가 직원과 StaffType 사이에 하나 많은 관계를 가지고 있기 때문에이 오류가 있습니다. 사실
@OneToMany(fetch = FetchType.LAZY, mappedBy = "staffType")
@JsonIgnore
public Set<Staff> getStaffs() {
return this.staffs;
}
을 사용하여 작동 @JsonIgnore : 이 문제입니다! 이제 제 질문은 : @JsonIgnore없이 어떻게 해결할 수 있습니까? 왜냐하면, @JsonIgnore를 사용하면 결과 json 파일에 fkstaff_type_staff라는 외래 키가 포함되지 않기 때문입니다. 어떻게 해결할 수 있습니까? 감사합니다. .
PS는 다음 JPA 세션이 종료 된 후 직렬화가 일어나고
package it.jack.fdd.dao.impl;
import it.jack.fdd.dao.interfaces.BaseDao;
import it.jack.fdd.model.Product;
import it.jack.fdd.model.Staff;
import it.jack.fdd.model.User;
import it.jack.fdd.util.HibernateUtilLezione;
import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
public class BaseDaoImpl<T> implements BaseDao<T> {
\t public BaseDaoImpl() {
\t \t super();
\t }
\t /* (non-Javadoc)
\t * @see it.unisalento.se.dao.impl.BaseDao#save(T)
\t */
\t public int save(T entity) {
\t
\t \t int id = 0;
\t \t
\t \t try {
\t \t \t
\t \t \t
\t \t \t /*
\t \t \t * DIFFERENZA TRA openSession() e getCurrentSession):
\t \t \t *
\t \t \t \t When you create a hibernate session using any of the sessionFactory.openSession(...)
\t \t \t \t methods the session factory will 'bind' the session to the current context.
\t \t \t \t The default context is 'thread' which means the sesion factory will bind the session
\t \t \t \t to the thread from which openSession(...) is called.
\t \t \t \t This is useful because you can later call sessionFactory.getCurrentSession() which will
\t \t \t \t return the session that is bound to the currently running thread.
\t \t \t \t You can use other predefined current_session_context_class values such as 'jta' which will
\t \t \t \t bind the session to the currently running JTA transaction (if you're running in an
\t \t \t \t application server that supports JTA this is really useful). Or you can write your
\t \t \t \t own implementation of org.hibernate.context.CurrentSessionContext and use that implementation
\t \t \t \t to manage the current session context (not really advisable unless you absolutely need to).
\t \t \t *
\t \t \t */
\t \t \t
\t \t \t
\t \t \t //Prep work
\t \t \t //SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
\t \t \t
\t \t \t Session session = HibernateUtilLezione.openSession(); //dall'esempio mio fa getCurrentSession()
\t \t \t Transaction tx = session.beginTransaction();
\t \t \t
\t \t \t id = (Integer) session.save(entity);
\t \t \t tx.commit();
\t \t \t session.close();
\t \t }catch(HibernateException e){
\t \t \t e.printStackTrace();
\t \t }
\t \t return id;
\t }
\t /* (non-Javadoc)
\t * @see it.unisalento.se.dao.impl.BaseDao#getAll(java.lang.Class)
\t */
\t public List<T> getAll(Class clazz) {
\t \t
\t \t Session session = HibernateUtilLezione.openSession();
\t \t Transaction tx = session.beginTransaction();
\t \t
\t \t @SuppressWarnings("unchecked")
\t \t List<T> list = session.createQuery("from "+clazz.getName()).list();
\t \t tx.commit();
\t \t session.close();
\t \t \t \t
\t \t return list;
\t }
\t /* (non-Javadoc)
\t * @see it.unisalento.se.dao.impl.BaseDao#getById(int, java.lang.Class)
\t */
\t public T getById(int id, Class clazz) {
\t \t try{
\t \t
\t \t \t Session session = HibernateUtilLezione.openSession();
\t \t \t Transaction tx = session.beginTransaction();
\t \t \t
\t \t \t @SuppressWarnings("unchecked")
\t \t \t T returnObj = (T) session.get(clazz.getName(), id);
\t \t \t /*
\t \t \t System.out.println("vediamo "+session.getIdentifier(returnObj));
\t \t \t System.out.println("vediamo2 "+session.getEntityName(returnObj));
\t \t \t */
\t \t \t tx.commit();
\t \t \t session.close();
\t \t \t
\t \t \t return returnObj;
\t \t }
\t \t catch(HibernateException e){
\t \t \t e.printStackTrace();
\t \t \t return null;
\t \t }
\t \t
\t }
\t
\t /* (non-Javadoc)
\t * @see it.unisalento.se.dao.impl.BaseDao#delete(int, java.lang.Class)
\t */
\t public void delete (int id, Class clazz){
\t \t
\t \t Session session = HibernateUtilLezione.openSession();
\t \t Transaction tx = session.beginTransaction();
\t \t
\t \t T t = (T) session.get(clazz, id);
\t \t session.delete(t);
\t \t tx.commit();
\t \t session.close();
\t \t
\t }
/*
\t public Serializable getByUID(Staff stf) {
\t \t // TODO Auto-generated method stub
\t \t return null;
\t }
\t */
\t public void update(T entity) {
\t \t try {
\t \t \t Session session = HibernateUtilLezione.openSession();
\t \t \t Transaction tx = session.beginTransaction();
\t \t \t \t \t
\t \t \t session.update(entity);
\t \t \t tx.commit();
\t \t \t session.close();
\t \t }
\t \t catch(HibernateException e){
\t \t \t e.printStackTrace();
\t \t }
\t \t
\t }
\t
}
감사합니다, 어떻게 수를 선언하는 선언 들판? 예를 들어 줄 수 있습니까? –
(BaseDaoImpl.java 추가) –
원하는 것은 필드의 주석에'fetch = FetchType.EAGER'입니다. – Radu