how to rectify this mapping exception( Use of #OneToMany or #ManyToMany targeting an unmapped class) - spring

Question

Hi I am getting some mapping exception please follow the below error
org.hibernate.AnnotationException: Use of #OneToMany or #ManyToMany targeting an unmapped class: com.cmr.daos.child.domain.Child.medications[com.cmr.daos.child.domain.Medications]
at org.hibernate.cfg.annotations.CollectionBinder.bindManyToManySecondPass(CollectionBinder.java:1185)
at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:710)
at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:645)
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:65)
at org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1716)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1423)
at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1375)
at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:720)
at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:188)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1571)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1509)
... 62 more
My domain class:
public class Child extends AuditProperties implements java.io.Serializable {
#Expose private Long childId;
#Expose private String firstName;
#Expose private String lastName;
private Set<Allergies> allergies = new HashSet<Allergies>();
private Set<Medications> medications = new HashSet<Medications>();
#OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "child")
#JsonManagedReference
public Set<Medications> getMedications() {
return this.medications;
}
public void setMedications(Set<Medications> medications) {
this.medications = medications;
}
#OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "child")
#JsonManagedReference
public Set<Allergies> getAllergies() {
return this.allergies;
}
public void setAllergies(Set<Allergies> allergies) {
this.allergies = allergies;
}
#Id
#GeneratedValue(strategy = IDENTITY)
#Column(name = "CHILD_ID", unique = true, nullable = false)
public Long getChildId() {
return this.childId;
}
public void setChildId(Long childId) {
this.childId = childId;
}
#Column(name = "FIRST_NAME", nullable = false, length = 64)
public String getFirstName() {
return this.firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
#Column(name = "LAST_NAME", nullable = false, length = 64)
public String getLastName() {
return this.lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
Here my mapped classs:
public class Medications extends AuditProperties implements java.io.Serializable{
#Expose private Long medicationId;
#Expose private String hasMedication;
#Expose private String medicationType;
#Expose private transient Child child;
#ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
#JoinColumn(name = "CHILD_ID")
#JsonBackReference
public Child getChild() {
return child;
}
public void setChild(Child child) {
this.child = child;
}
#Id
#GeneratedValue(strategy = IDENTITY)
#Column(name = "MEDICATION_ID", unique = true, nullable = false)
public Long getMedicationId() {
return medicationId;
}
public void setMedicationId(Long medicationId) {
this.medicationId = medicationId;
}
#Column(name = "HAS_MEDICATION", nullable = false, length = 3)
public String getHasMedication() {
return hasMedication;
}
public void setHasMedication(String hasMedication) {
this.hasMedication = hasMedication;
}
#Column(name = "MEDICATION_TYPE", length = 64)
public String getMedicationType() {
return medicationType;
}
public void setMedicationType(String medicationType) {
this.medicationType = medicationType;
}
}
Here another mapped class:
#Entity
#Table(name = "ALLERGIES")
public class Allergies extends AuditProperties implements java.io.Serializable {
#Expose private Long allergyId;
#Expose private String hasAllergies;
#Expose private String allerigyType;
#Expose private transient Child child;
#ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
#JoinColumn(name = "CHILD_ID")
#JsonBackReference
public Child getChild() {
return child;
}
public void setChild(Child child) {
this.child = child;
}
#Id
#GeneratedValue(strategy = IDENTITY)
#Column(name = "ALLERGY_ID", unique = true, nullable = false)
public Long getAllergyId() {
return allergyId;
}
public void setAllergyId(Long allergyId) {
this.allergyId = allergyId;
}
#Column(name = "HAS_ALLERGIES", length = 3)
public String getHasAllergies() {
return hasAllergies;
}
public void setHasAllergies(String hasAllergies) {
this.hasAllergies = hasAllergies;
}
#Column(name = "ALLERIGY_TYPE", length = 20)
public String getAllerigyType() {
return allerigyType;
}
public void setAllerigyType(String allerigyType) {
this.allerigyType = allerigyType;
}
}
Here i mentioned one child class, allergy class and medication class.Here i mapped child object to both the classes(allergy,medications) then i will get this exception.please help me abot this exception

Answer 1

As the exception says:
Use of #OneToMany or #ManyToMany targeting an unmapped class:
com.cmr.daos.child.domain.Child.medications[com.cmr.daos.child.domain.Medications]
Hibernate is trying to find the entity Medications that represents the property medications in your Child class.
Looking at the etities everything looks good, so I assume you missed to place #Entity for Medications class or you missed to mention about this entity in hibernate.cfg.xml file.