I am new to hibernate and trying to implement join annotations of hibernate, but facing this weird issue. As I have attached pojos when I run my controller no output is seen but a new row got populated in user_song_rel table as a foreign key to the song table.
In addition, value of that entry is null(in MySQL screenshot) despite there are entries in the song table corresponding to song_ids.
Please find attached schema of both tables.
Thanks in advance :)
Schema Structure
User Song Mapping
#NamedQueries({
#NamedQuery(
name="findUserSongByUserID",
query="from UserSongRel usr where usr.user_id = :user_id"
)
})
#Entity
#Table(name="user_song_rel")
public class UserSongRel {
public UserSongRel() {
}
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int usr_id;
private String user_id;
private String song_id;
private String song_src;
private int song_state;
#Temporal(TemporalType.TIMESTAMP)
private Date add_date;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(referencedColumnName = "song_id")
private SongInfo songInfo;
Song
#Entity (name = "song_info")
public class SongInfo {
#Id
private String song_id;
private String s_name;
private String artist;
private String album;
private int duration;
private Date rel_date;
private int popularity;
#OneToMany(mappedBy = "songInfo")
private List<UserSongRel> userSongRelList=new ArrayList<UserSongRel>();
Controller
#RequestMapping(value = "/getUserSongs/{uid}", method = RequestMethod.GET, produces = "application/json")
public ResponseEntity<?> getUserSongs(#PathVariable String uid,
HttpServletResponse response, HttpServletRequest request){
SongInfo usr= songService.getUserSongs(uid);
return ResponseEntity.ok().body(usr);
}
DAO
public SongInfo getUserSongs(String uid) {
Session s = sf.getCurrentSession();
UserSongRel songs=s.get(UserSongRel.class, 1);
List<UserSongRel> songList =new ArrayList<UserSongRel>();
songList.add(songs);
return songList.get(0).getSongInfo();
}
Select query after running controller.
Related
Well... I have an auto-generated database by hibernate and when I try to call findAll() in controller I receive that
More than one row with the given identifier was found: 1, for class: com.example.rentacar.domain.Masina
Anyway, I checked database I don t have duplicates keys. This is the controller:
#Controller
public class MasinaController {
MasinaService masinaService;
#Autowired
public MasinaController (MasinaService masinaService){
this.masinaService = masinaService;
}
#RequestMapping("/masini")
public String getMasini(Model model){
var masini = masinaService.findMasini();
model.addAttribute("masini", masini);
return "masini";
}
}
service:
#Autowired
public MasinaServiceImpl(MasinaRepo masinaRepo) {
this.masinaRepo = masinaRepo;
}
public List<Masina> findMasini(){
var masini = masinaRepo.findAll();
return masini;
}
this is the domain:
#Entity
#Data
public class Masina {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String model;
private Integer capacitateCilindrica;
private Integer putere;
private Integer anProductie;
private String culoare;
private String numarInmatriculare;
private Float pret;
private Boolean esteInchiriata;
#OneToOne(mappedBy = "masina")
private ChirieActiva ChirieActiva;
#OneToMany(mappedBy = "masina")
private List<ChirieFinalizata> ChiriiFinalizate;
#OneToOne
private Firma Firma;
#ManyToMany(mappedBy = "Masini",
cascade = {CascadeType.PERSIST, CascadeType.MERGE})
private List<Categorie> CategoriiMasina;
}
The rest of object that are linked are empty(no-entries).
I tried to see what identifier is corrupted so I iterate through all entries to see what id will return me an error. After full iteration none of the entries returned error..
The funniest part is that if I add this code in controller (iterate through all entries from db using findById before calling findAll) it WORKS !!!!
So.. my controller looks like this...
#RequestMapping("/masini")
public String getMasini(Model model){
for(int i=1; i<9;i++){
var masina = masinaService.findById(i);
}
var masini = masinaService.findMasini();
model.addAttribute("masini", masini);
return "masini";
}
Did anyone know why that happens? Thanks a lot!
I solved the problem by adding (fetch = FetchType.LAZY) to #OneToOne relationships.
I am using PostgreSQL and java for building the backend of an application.
In PostgreSQL, I have used an enum here.
and in java I have used enum for layer variable also.
#Entity
#Getter
#Setter
#Table(name = "usecase_details")
#JsonIgnoreProperties
public class UsecaseDetails {
#Id
#Column(name="id", nullable = false)
#SequenceGenerator(name= "usecase_details_sequence", sequenceName
="usecase_details_id_sequence")
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator =
"usecase_details_sequence" )
private Long id;
#Column(columnDefinition = "layer_t", nullable = false)
#Enumerated(EnumType.STRING)
#Type(type = "com.apple.exampleportal.portal.utility.EnumTypePostgreSql")
private Layer layer;
private Long check_id;
private int usecase_id;
private String description;
private String fix_type;
private String radars;
private boolean show_usecase = true;
public UsecaseDetails(Long id, Layer layer, Long check_id, int usecase_id, String description, String fix_type, String radars, boolean show_usecase) {
this.id = id;
this.layer = layer;
this.check_id = check_id;
this.usecase_id = usecase_id;
this.description = description;
this.fix_type = fix_type;
this.radars = radars;
this.show_usecase = show_usecase;
}
// skipping getter setter for brevity
EnumTypePostgreSql. class is
public class EnumTypePostgreSql extends EnumType {
#Override
public void nullSafeSet(
PreparedStatement st,
Object value,
int index,
SharedSessionContractImplementor session)
throws HibernateException, SQLException {
st.setObject(
index,
value != null ?
((Enum) value).name() :
null,
Types.OTHER
);
}
}
and my custom queries are as follows:
public interface UsecaseRepository extends JpaRepository<UsecaseDetails, Long> {
#Query(value = "SELECT description, fix_type, usecase_id, layer FROM public.usecase_details WHERE layer = :layer", nativeQuery = true)
List<UsecaseDetails> findUsecaseByLayer(Layer layer);
#Query(value = "INSERT INTO public.usecase_details(description,fix_type, usecase_id, layer)\n"+
"\tVALUES (?,?,?,?)", nativeQuery = true)
UsecaseDetails insertDetails(UsecaseDetails usecaseDetails);
The insert query is working properly but for findUsecaseByLayer , I am getting the following error.
I am unable to detect my mistake. Please help!
There's probably something wrong with how you declare the type in EnumTypePostgreSql.
I also noticed this in your custom query: WHERE layer: = ?layer is the : wanted before your equal?
The solution I use:
Remove the #Type annotation from your entity column
#Column(columnDefinition = "layer_t", nullable = false)
#Enumerated(EnumType.STRING)
private Layer layer;
Then add to your JDBC URI:
?stringtype=unspecified
This will automatically cast the string to its enum type.
(column and variable name changed after posting question)i am writing join query using entityManager.createNativeQuery(somequery) in jpa custom method when i run code i get following error :
com.ibm.db2.jcc.am.SqlException: [jcc][10150][10300][4.12.56] Invalid >parameter: Unknown column name exc_seq_nbr. ERRORCODE=-4460, SQLSTATE=null
i am using IBM DB2 server and spring boot
exceptionTenderPK (object in entity class) is not being mapped correctly thats why getting invalid column can someone please tell me how to map exceptionTenderPK object class
Note: i cant use #OneToMany in this case because tables are unrelated
#Entity
#Table(name = "Table_name")
#Data
public class MainPojoclass {
#EmbeddedId
#JsonProperty(value = "mainPojoclassPK")
private MainPojoclassPK mainPojoclassPK;
#Column(name = "amt")
#JsonProperty(value = "amt")
private BigDecimal amt;
#Column(name = "tndid")
#JsonProperty(value = "tndid")
private String tndid;
#Column(name = "cde")
#JsonProperty(value = "cde")
private String cde;
#Column(name = "ind")
#JsonProperty(value = "ind")
private String ind;
#Column(name = "user")
#JsonProperty(value = "user")
private String user;
#Column(name = "updatedtime")
#JsonProperty(value = "updatedtime")
private Date updatedtime;
#Column(name = "src")
#JsonProperty(value = "src")
private String src;
#Column(name = "stat")
#JsonProperty(value = "stat")
private String stat;
}
#Transactional
public interface JoinQueryRepository extends JpaRepository<MainPojoclass, Long>, JoinQueryRepositoryCustom{
}
public interface JoinQueryRepositoryCustom {
List<MainPojoclass> getGRDetails(MainPojoclass et,Date reportDate);
}
public class JoinQueryRepositoryImpl implements JoinQueryRepositoryCustom {
#PersistenceContext
EntityManager entityManager;
#SuppressWarnings("all")
#Override
public List<MainPojoclass> getGRDetails(MainPojoclass et,Date rdate) {
String queryStr = "select et.Salss_DTE from table et"
+ " join dte etr on et.Salss_DTE = etr.Salss_DTE where et.nbr =? ";
List<MainPojoclass> datalist = null;
Query query = entityManager.
createNativeQuery(queryStr,"mapping")
.setParameter(1, 222);
datalist = query.getResultList();
return datalist;
}
}
The error says that there is no column exc_seq_nbr and you used that in your EntityResult mapping.
In your query you only return et.SLS_DTE you have to return all columns that are in the result set mapping.
Hi all since i am not getting any solutions i am going with below solution it works for me and removing #SqlResultSetMapping below code is working without sql result set mapping
Query q = em.createNativeQuery(queryStr);
List<Object[]> resultList = q.getResultList();
for (Object[] result : resultList) {
entityObj.setReason(result[0].toString);
//rest attribute will convert from result[1].toString to corresponding
// data type and set to entity object
}
I am using hibernate 4. I am writing a filter. The strange thing I noticed is the filter is not getting applied if I use session.get() method
public SecurityAgency getSecurityAgencyById(int id) {
Session session = this.sessionFactory.getCurrentSession();
session.enableFilter("byEnabled");
SecurityAgency s = (SecurityAgency)session.get(SecurityAgency.class, new Integer(id));
return s;
}
Filter starts working as soon as I replace the session.get method with session.createQuery method and send a HQL query. I am unable to find any reason for this behaviour in the hibernate documentation.
FIlter declaration in securtiy agency class
#Entity
#Table(name="security_agency")
public class SecurityAgency implements java.io.Serializable {
#Id
#Column(name = "id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
#Column(name="name")
private String name;
#Column(name="code")
private String code;
#Column(name="website")
private String website;
#Column(name="tan")
private String tan;
#Column(name="email")
private String email;
#Column(name="pan")
private String pan;
#Column(name="created_at")
private Date createdAt;
#Column(name="created_by")
private long createdBy;
#Column(name="modified_at")
private Date modifiedAt;
#Column(name="modified_by")
private long modifiedBy;
#OneToMany(mappedBy="securityAgency",fetch = FetchType.EAGER)
#JsonIgnoreProperties("securityAgency")
#Filter(name = "byEnabled", condition = "is_enabled= 1")
private Set<ContactPerson> contactPersons = new HashSet<ContactPerson>(0);
public SecurityAgency() {
}
Contact person class
#Entity
#Table(name = "contact_person")
#FilterDefs({
#FilterDef(name="byEnabled"),
#FilterDef(name="bySecurityAgency",parameters = #ParamDef(name="agency_id", type="int"))
})
#Filters({
#Filter(name="byEnabled", condition = "is_enabled = 1"),
#Filter(name="bySecurityAgency", condition = "agency_id= :agency_id ")
})
public class ContactPerson implements java.io.Serializable {
Filter doesn't work if you are fetching using id value.Use Query interface instead. See this thread
if you want to use table column values you need to use filter join table ( #FilterJoinTable ), #Filter is applied to target entity rather than table
try,
#FilterJoinTable(name = "byEnabled", condition = "is_enabled= :enabled")
private Set<ContactPerson> contactPersons = new HashSet<ContactPerson>(0);
get
session.enableFilter("byEnabled").setParameter("enabled", Integer.valueOf(1));
I am working on a Spring-MVC application in which I am trying to search for List of GroupNotes in database. The mapping in my project is GroupCanvas has one-to-many mapping with GroupSection and GroupSection has one-to-many mapping with GroupNotes. Because of these mappings, I was getting LazyInitializationException. As suggested on SO, I should be converting the objects to a DTO objects for transfer. I checked on net, but couldnt find a suitable way to translate those.
I have just created a new List to avoid the error, but one field is still giving me an error. I would appreciate if anyone tells me either how to fix this error or convert the objects to a DTO objects so they can be transferred.
Controller code :
#RequestMapping(value = "/findgroupnotes/{days}/{canvasid}")
public #ResponseBody List<GroupNotes> findGroupNotesByDays(#PathVariable("days")int days, #PathVariable("canvasid")int canvasid){
List<GroupNotes> groupNotesList = this.groupNotesService.findGroupNotesByDays(days,canvasid);
List<GroupNotes> toSendList = new ArrayList<>();
for(GroupNotes groupNotes : groupNotesList){
GroupNotes toSendNotes = new GroupNotes();
toSendNotes.setMnotecolor(groupNotes.getMnotecolor());
toSendNotes.setNoteCreationTime(groupNotes.getNoteCreationTime());
toSendNotes.setMnotetag(groupNotes.getMnotetag());
toSendNotes.setMnotetext(groupNotes.getMnotetext());
toSendNotes.setAttachCount(groupNotes.getAttachCount());
toSendNotes.setNoteDate(groupNotes.getNoteDate());
toSendList.add(toSendNotes);
}
return toSendList;
}
GroupNotesDAOImpl :
#Override
public List<GroupNotes> searchNotesByDays(int days, int mcanvasid) {
Session session = this.sessionFactory.getCurrentSession();
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DAY_OF_YEAR, -days);
long daysAgo = cal.getTimeInMillis();
Timestamp nowMinusDaysAsTimestamp = new Timestamp(daysAgo);
GroupCanvas groupCanvas = (GroupCanvas) session.get(GroupCanvas.class,mcanvasid);
Query query = session.createQuery("from GroupSection as n where n.currentcanvas.mcanvasid=:mcanvasid");
query.setParameter("mcanvasid", mcanvasid);
List<GroupSection> sectionList = query.list();
List<GroupNotes> notesList = new ArrayList<GroupNotes>();
for (GroupSection e : sectionList) {
System.out.println("Section name is "+e.getMsectionname());
GroupSection groupSection = (GroupSection) session.get(GroupSection.class,e.getMsectionid());
Query query1 = session.createQuery("from GroupNotes as gn where gn.ownednotes.msectionid=:msectionid and gn.noteCreationTime >:limit");
query1.setParameter("limit", nowMinusDaysAsTimestamp);
query1.setParameter("msectionid",e.getMsectionid());
notesList.addAll(query1.list());
}
// I am getting the data below, but I get JSON errors.
for(GroupNotes groupNotes : notesList){
System.out.println("Group notes found are "+groupNotes.getMnotetext());
}
return notesList;
}
GroupCanvas model :
#Entity
#Table(name = "membercanvas")
public class GroupCanvas{
#OneToMany(mappedBy = "currentcanvas",fetch=FetchType.LAZY, cascade = CascadeType.REMOVE)
#JsonIgnore
private Set<GroupSection> ownedsection = new HashSet<>();
#JsonIgnore
public Set<GroupSection> getOwnedsection() {
return this.ownedsection;
}
public void setOwnedsection(Set<GroupSection> ownedsection) {
this.ownedsection = ownedsection;
}
}
GroupSection model :
#Entity
#Table(name = "membersection")
public class GroupSection{
#OneToMany(mappedBy = "ownednotes", fetch = FetchType.EAGER,cascade = CascadeType.REMOVE)
#JsonIgnore
private Set<GroupNotes> sectionsnotes = new HashSet<>();
public Set<GroupNotes> getSectionsnotes(){
return this.sectionsnotes;
}
public void setSectionsnotes(Set<GroupNotes> sectionsnotes){
this.sectionsnotes=sectionsnotes;
}
}
GroupNotes model :
#Entity
#Table(name="groupnotes")
public class GroupNotes{
#Id
#Column(name="mnoteid")
#GeneratedValue(strategy = GenerationType.SEQUENCE,generator = "mnote_gen")
#SequenceGenerator(name = "mnote_gen",sequenceName = "mnote_seq")
#org.hibernate.annotations.Index(name = "mnoticesidindex")
private int mnoticesid;
#Column(name = "mnotetext")
private String mnotetext;
#Column(name = "mnoteheadline")
private String mnotetag;
#Column(name = "mnotecolor")
private String mnotecolor;
#Column(name = "mnoteorder")
private double mnoteorder;
#Column(name = "attachmentcount")
private int attachCount;
#Column(name = "notedate")
private String noteDate;
#Column(name = "uploader")
private String uploader;
#Column(name = "activeedit")
private boolean activeEdit;
#Column(name = "notedisabled")
private boolean noteDisabled;
#Column(name = "noteinactive")
private boolean noteInActive;
#Column(name = "notecreatoremail")
private String noteCreatorEmail;
#Column(name = "prefix")
private String prefix;
#Column(name = "timestamp")
private Timestamp noteCreationTime;
#Transient
private boolean notRead;
#Transient
private String tempNote;
#Transient
private String canvasUrl;
#ManyToOne
#JoinColumn(name = "msectionid")
#JsonIgnore
private GroupSection ownednotes;
#JsonIgnore
public GroupSection getOwnednotes(){return this.ownednotes;}
public void setOwnednotes(GroupSection ownednotes){this.ownednotes=ownednotes;}
#JsonIgnore
public int getOwnedSectionId(){
return this.ownednotes.getMsectionid();
}
#OneToMany(mappedBy = "mnotedata",fetch = FetchType.LAZY,cascade = CascadeType.REMOVE)
#JsonIgnore
private Set<GroupAttachments> mattachments = new HashSet<>();
public Set<GroupAttachments> getMattachments() {
return this.mattachments;
}
public void setMattachments(Set<GroupAttachments> mattachments) {
this.mattachments = mattachments;
}
#OneToMany(mappedBy = "mhistory",fetch = FetchType.LAZY,cascade = CascadeType.REMOVE)
#JsonIgnore
private Set<GroupNoteHistory> groupNoteHistorySet = new HashSet<>();
public Set<GroupNoteHistory> getGroupNoteHistorySet(){
return this.groupNoteHistorySet;
}
public void setGroupNoteHistorySet(Set<GroupNoteHistory> groupNoteHistorySet){
this.groupNoteHistorySet = groupNoteHistorySet;
}
#OneToMany(mappedBy = "unreadNotes",fetch = FetchType.LAZY,cascade = CascadeType.REMOVE)
#JsonIgnore
private Set<UnreadNotes> unreadNotesSet = new HashSet<>();
public Set<UnreadNotes> getUnreadNotesSet(){
return this.unreadNotesSet;
}
public void setUnreadNotesSet(Set<UnreadNotes> unreadNotesSet){
this.unreadNotesSet = unreadNotesSet;
}
//getters and setters ignored
}
Error log :
org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: (was java.lang.NullPointerException) (through reference chain: java.util.ArrayList[0]->com.journaldev.spring.model.GroupNotes["ownedSectionId"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: java.util.ArrayList[0]->com.journaldev.spring.model.GroupNotes["ownedSectionId"])
Kindly let me know what to do, as I am stuck on that error since some time.
What I think that happens is Jackson tries to serialize all fields in the hierarchy based on getter methods. In some situation NullPointerException is thrown in the following method:
#JsonIgnore
public int getOwnedSectionId(){
return this.ownednotes.getMsectionid();
}
replace it with the following method:
#JsonIgnore
public int getOwnedSectionId(){
if(this.ownednotes != null)
return this.ownednotes.getMsectionid();
return 1;
}
I don't have an explanation why jackson tries to serialize it when is market with #JsonIgnore but you can give a try with my proposal
I would appreciate if anyone tells me either how to fix this error or convert the objects to a DTO objects so they can be transferred.
We use DozerMapper at work for this purpose.
Instead of doing that mapping manually you might want to take a look at Blaze-Persistence Entity Views which can be used to efficiently implement the DTO pattern with JPA. Here a quick code sample how your problem could be solved
First you define your DTO as entity view
#EntityView(GroupNotes.class)
public interface GroupNoteView {
#IdMapping("mnoticesid") int getId();
String getMnotecolor();
String getMnotetag();
String getMnotetext();
String getNoteDate();
Timestamp getNoteCreationTime();
int getAttachCount();
}
Next you adapt your DAO to make use of it
#Override
public List<GroupNoteView> searchNotesByDays(int days, int mcanvasid) {
EntityManager entityManager = // get the entity manager from somewhere
CriteriaBuilderFactory cbf = // factory for query building from Blaze-Persistence
EntityViewManager evm = // factory for applying entity views on query builders
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DAY_OF_YEAR, -days);
long daysAgo = cal.getTimeInMillis();
Timestamp nowMinusDaysAsTimestamp = new Timestamp(daysAgo);
CriteriaBuilder<GroupNotes> cb = cbf.create(entityManager, GroupNotes.class, "note")
.where("noteCreationTime").gt(nowMinusDaysAsTimestamp)
.where("ownednotes.ownedcanvas.mcanvasid").eq(mcanvasid);
return evm.applySetting(EntityViewSetting.create(GroupNoteView.class), cb)
.getResultList();
}
And finally the calling code
#RequestMapping(value = "/findgroupnotes/{days}/{canvasid}")
public #ResponseBody List<GroupNoteView> findGroupNotesByDays(#PathVariable("days")int days, #PathVariable("canvasid")int canvasid){
return this.groupNotesService.findGroupNotesByDays(days, canvasid);
}