Hibernate OneToMany java.lang.StackOverflowError
JavaHibernateStack OverflowOne to-ManyJava Problem Overview
It's my first question here on stack, so please be gentle :D
I'm trying to create hibernate OneToMany relationship. When I try to fetch some data from my DB, I'm getting StackOverflowError. But when i remove OneToMany part, everything goes normally. This is part of my REST Service, for now it runs on VMware vFabric Server and MySQL DB.
Fetch example:
@Inject
private EntityManager entityManager;
...
entityManager.find(League.class, 1);
...
entityManager.find(Team.class, 1);
MySQL script:
CREATE TABLE league (
id int(11) NOT NULL AUTO_INCREMENT,
name varchar(20) COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE team (
team_id int(11) NOT NULL AUTO_INCREMENT,
name varchar(20) COLLATE utf8_unicode_ci NOT NULL,
fk_leagueId int(11) NOT NULL,
PRIMARY KEY (team_id),
FOREIGN KEY (fk_leagueId) REFERENCES league(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
Classes:
@XmlRootElement
@Entity
@Table(name = "team")
@Data
public class Team {
@Id
@GeneratedValue(generator = "increment")
@GenericGenerator(name = "increment", strategy = "increment")
@Column(name = "team_id")
private int id;
@Column(name = "name")
private String name;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "fk_leagueId", nullable = false)
private League league;
}
@XmlRootElement
@Entity
@Table(name = "league")
@Data
public class League {
@Id
@GeneratedValue(generator = "increment")
@GenericGenerator(name = "increment", strategy = "increment")
@Column(name = "id")
private int id;
@Column(name = "name")
private String name;
//if I comment 2 lines below, there is no error, and everything works fine
@OneToMany(fetch = FetchType.LAZY, mappedBy = "league")
private Set<Team> teams;
}
Error:
Hibernate: select league0_.id as id1_1_0_, league0_.name as name2_1_0_ from league league0_ where league0_.id=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Exception in thread "tomcat-http--3" java.lang.StackOverflowError
at org.jboss.logging.JDKLogger.translate(JDKLogger.java:73)
at org.jboss.logging.JDKLogger.isEnabled(JDKLogger.java:85)
at org.jboss.logging.JDKLogger.doLog(JDKLogger.java:41)
at org.jboss.logging.Logger.debug(Logger.java:406)
at org.hibernate.internal.CoreMessageLogger_$logger.debug(CoreMessageLogger_$logger.java:525)
at org.hibernate.engine.jdbc.spi.SqlStatementLogger.logStatement(SqlStatementLogger.java:104)
at org.hibernate.engine.jdbc.spi.SqlStatementLogger.logStatement(SqlStatementLogger.java:95)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:180)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:159)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1858)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1835)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1815)
at org.hibernate.loader.Loader.doQuery(Loader.java:899)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:341)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:311)
at org.hibernate.loader.Loader.loadCollection(Loader.java:2234)
at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:65)
at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:674)
at org.hibernate.event.internal.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:83)
at org.hibernate.internal.SessionImpl.initializeCollection(SessionImpl.java:1849)
at org.hibernate.collection.internal.AbstractPersistentCollection$4.doWork(AbstractPersistentCollection.java:549)
at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:234)
at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:545)
at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:124)
at org.hibernate.collection.internal.PersistentSet.hashCode(PersistentSet.java:428)
at com.lukaszb.motspe.webapp.model.League.hashCode(League.java:21)
at com.lukaszb.motspe.webapp.model.Team.hashCode(Team.java:20)
at java.util.HashMap.hash(HashMap.java:351)
at java.util.HashMap.put(HashMap.java:471)
at java.util.HashSet.add(HashSet.java:217)
...
Edit:
I was able to solve this out thanks to @Thihara and @KarIP. I have overriden toString() for Team and League like this:
@Override
public String toString() {
return "League [id=" + id + ", name=" + name + "]";
}
@Override
public String toString() {
return "Team [id=" + id + ", name=" + name + "]";
}
and was able to fetch data from DB as wanted. But then while parsing I got JAXB error with infinite cycles. So i annotated Team and League class with @XmlAccessorType(XmlAccessType.FIELD)
, so it won't look at methods, and Team league
field as @XmlTransient
, so it won't be parsed.
Here I can even remove my toString() implementations, and it still works. I'm not completely sure why. Problem is solved, but I would like to hear more precise explanation. I don't know why JAXB stopped data fetch, even if it's after whole DB communication process(or isn't?). To be more specific, I'm using Jersey for that:
@GET
@Path("search/id")
@Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
public List<League> searchById(@QueryParam("id") int id) {
return Arrays.asList(leagueDAO.getById(id));
}
Java Solutions
Solution 1 - Java
I had a very similar issue. I was using Lombok's @Data
annotation on my model objects to auto-generate getters, setters, and other standard methods. I believe the toString()
method generated by Lombok introduced a circular dependency between my Team
and League
objects. When I tried to get the Set<teams> teams
from my League
object, I got a java.lang.StackOverflowError
because Spring was calling the toString method for logging purposes.
I resolved this by getting rid of Lombok's toString()
method. I replaced the @Data
annotation with Lombok's @Getter
and @Setter
annotations. That way I still could benefit from free getters and setters without getting the toString()
method.
Solution 2 - Java
The only way it can throw an StackOverFlow is when your Team's League is accessed recursively....
Team to League to Team to League
I'm guessing there's some function trying to convert your objects into some other representation reflectively or recursively resulting in an infinite loop.
Solution 3 - Java
Circular dependency can originate from Lombok's toString()
autogenerated method, if you use @Data
complex annotation. To exclude your circular dependecy for a certain field:
@Entity
@Data
public class Team {
...
@ToString.Exclude
@ManyToOne
private League league;
}
Solution 4 - Java
I had this error because I was parsing a list of objects mapped on both sides @OneToMany
and @ManyToOne
to json using jackson which caused an infinite loop.
If you are in the same situation you can solve this by using @JsonManagedReference
and @JsonBackReference
annotations.
Definitions from API :
-
JsonManagedReference (https://fasterxml.github.io/jackson-annotations/javadoc/2.5/com/fasterxml/jackson/annotation/JsonManagedReference.html) : > Annotation used to indicate that annotated property is part of two-way > linkage between fields; and that its role is "parent" (or "forward") > link. Value type (class) of property must have a single compatible > property annotated with JsonBackReference. Linkage is handled such > that the property annotated with this annotation is handled normally > (serialized normally, no special handling for deserialization); it is > the matching back reference that requires special handling
-
JsonBackReference: (https://fasterxml.github.io/jackson-annotations/javadoc/2.5/com/fasterxml/jackson/annotation/JsonBackReference.html): > Annotation used to indicate that associated property is part of > two-way linkage between fields; and that its role is "child" (or > "back") link. Value type of the property must be a bean: it can not be > a Collection, Map, Array or enumeration. Linkage is handled such that > the property annotated with this annotation is not serialized; and > during deserialization, its value is set to instance that has the > "managed" (forward) link.
Example:
Owner.java:
@JsonManagedReference
@OneToMany(mappedBy = "owner", fetch = FetchType.EAGER)
Set<Car> cars;
Car.java:
@JsonBackReference
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "owner_id")
private Owner owner;
Another solution is to use @JsonIgnore
which will just set null to the field.
Solution 5 - Java
For me, Both hashCode and toString default implementation provided by Lombok was causing this issue.
You can use this annotation to exclude members for both equalsAndHasCode with single annotation:
@EqualsAndHashCode(exclude = {"certificates", "payment"})
Also if you want to exclude just members from equals method, Lombok provide : @ToString.Exclude
@ToString.Exclude
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "shipment")
private Set<Certificate> certificates;
Solution 6 - Java
I replaced the @Data annotation with Lombok's @Getter and @Setter annotations
Solution 7 - Java
I had similar issue and in my case nothing of this didnt help.
Helped this one approach:
@OneToMany(cascade = CascadeType.ALL)
@JoinColumn(name = "order_id")
@Fetch(value = FetchMode.SUBSELECT)
private List<Product> orderLines;
name = "order_id" is a foreign key column from Product table.
And i didnt put anything in Product entity.
Solution 8 - Java
I struggled a very long time and thought it's a problem from Kotlin why it throws an Stackoverflow Exception. At the end it was Jackson, which is used by Spring Hibernate and causese the Stackoverflow.
You can solve that by setting @JsonIgnoreProperties
on both sides. Example:
public class ProductEntity implements Serializable {
private List<ProductPriceEntity> refProductPriceEntities = new ArrayList<>();
@OneToMany(
mappedBy = "product",
fetch = FetchType.LAZY,
cascade = CascadeType.ALL,
orphanRemoval = true,
targetEntity = ProductPriceEntity.class)
@JsonIgnoreProperties(value = "product", allowSetters = true)
public List<ProductPriceEntity> getRefProductPriceEntities() {
return refProductPriceEntities;
}
public void setRefProductPriceEntities(List<ProductPriceEntity> refProductPriceEntities) {
this.refProductPriceEntities = refProductPriceEntities;
}
}
and finally the other side, which caused the stackoverflow exception.
public class ProductPriceEntity {
private ProductEntity product;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumns({
@JoinColumn(name = "product_id", referencedColumnName = "id", nullable = false),
@JoinColumn(name = "product_version_id", referencedColumnName = "version_id", nullable = false)
})
@JsonIgnoreProperties(value = "refProductPriceEntities", allowSetters = true)
public ProductEntity getProduct() {
return product;
}
public void setProduct(ProductEntity product) {
this.product = product;
}
}
Solution 9 - Java
Got this error in OneToOne mapping in hibernate, the Entity class was unable to convert toString.
Class A(Details.class)-
@OneToOne
@JoinColumn(name="billing_address_id")
private Address billingAddress;
@OneToOne
@JoinColumn(name="shipping_address_id")
private Address shippingAddress;
Class B(Address.class)-
@OneToOne(mappedBy="billingAddress")
private Details billingDetails;
@OneToOne(mappedBy="shippingAddress")
private Details shippingDetails;
Error- because Class A is calling Class B and similarly, class B is calling Class A. Need to remove one of the two. Then this issue will be resolved.
Solution 10 - Java
When i was having this problem i was converting the entity to dto. I then realized i was calling the parent class annotated with onetomany from the bridge class annotated with manytoone. Because the parent already calls the bridge, it became cyclic and the collection recursed. Instead of calling the parent method that populates, i just initialized and populated the parent in the child.
Solution 11 - Java
Also see: https://stackoverflow.com/questions/25692299/hibernate-throws-stackoverflowerror-when-querying
In my case, I was using the @IdClass
annotation on an entity which had a foreign key as part of its primary key:
@IdClass(MyEntity.MyEntityKey.class)
public class MyEntity {
public static class MyEntityKey {
private Foo parent;
private int count;
// Getters, setters, constructor, ...
}
@Id
private Foo parent;
@Id
private int number;
//...
}
Now when loading Foo
and eagerly loading all MyEntity
s, Hibernate was again loading the parent entity Foo
while building the key which resulted in the stack overflow.
I fixed the issue by modelling the id using explicit key properties (i.e. including the keys of Foo in MyEntityKey
rather than just a reference to Foo
) as shown in Composite key handling, using @Idclass annotation in Spring boot java (also applied to Non-Spring Hibernate). In short: Use the @JoinColumns
annotation to specify the relationship between the navigation property (to parent) and the id columns.
Solution 12 - Java
When I was having this problem, I could solve it with @JsonManagedReference
and @JsonBackReference
, however it meant that only one side of the entity had the child in it when deserializing into json. I.e. in your team and league example, Only the League would show teams, and the team wouldnt show which league it belonged to.
To allow both side, use @JsonIdentityInfo
annotation in your entity and remove the @JsonBackReference
and @JsonManagedReference
. You entities will be something like:
@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
public class Team {
...
This replaced the circular refrences with what I was looking for.
Solution 13 - Java
I find that using @EqualsAndHashCode(onlyExplicitlyIncluded = true) is a great place to start. In most cases, equality across objects should only be done on specific values. If you use this for every entity, it will force you to choose what you actually want to include in equality, and is likely to preven the circular memory reference.
Solution 14 - Java
I had a similar problem using Lombok on a save and flush. It was in my @EqualsAndHashCode, so you can exclude child collections by property name:
@Data
@EqualsAndHashCode(callSuper = true, exclude = "childRowCollectionProp")
@Entity
@Table(name = "parent")
public class Parent extends BaseEntityWithId{