Collection has neither generic type or OneToMany.targetEntity() defined

By on August 11, 2012 in Hibernate
Exception

“org.hibernate.AnnotationException: Collection has neither generic type or OneToMany.targetEntity() defined:“

I am getting following Exception 

Initial SessionFactory creation failed.org.hibernate.AnnotationException: Collection has neither generic type or OneToMany.targetEntity() defined: com.kruders.bean.Employee.employees
java.lang.ExceptionInInitializerError
    at com.kruders.bean.Main.<clinit>(Main.java:21)
Caused by: org.hibernate.AnnotationException: Collection has neither generic type or OneToMany.targetEntity() defined: com.kruders.bean.Employee.employees
    at org.hibernate.cfg.annotations.CollectionBinder.getCollectionType(CollectionBinder.java:621)
    at org.hibernate.cfg.annotations.CollectionBinder.bind(CollectionBinder.java:509)
    at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:1979)
    at org.hibernate.cfg.AnnotationBinder.processIdPropertiesIfNotAlready(AnnotationBinder.java:796)
    at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:707)
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:4008)
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3962)
    at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1371)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1829)
    at com.kruders.bean.Main.<clinit>(Main.java:18)
Exception in thread "main"

Solution

“Hibernate must know what type of object is in a Set, so add custom parametrized class in Set as shown below.“

private Set employees; //Exception
private Set<Employee> employees; //Works Fine

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One Response to Collection has neither generic type or OneToMany.targetEntity() defined

  1. Semih February 12, 2013 at 2:57 pm #

    You must add targetEntity to map other object. Like this;

    in book class

    @ManyToMany(cascade= CascadeType.ALL, targetEntity=Author.class)
    @JoinTable(name = “Book_Author_Table”,
    joinColumns = {
    @JoinColumn(name = “bookid”)},
    inverseJoinColumns = {
    @JoinColumn(name = “author_id”)})
    public List getAuthors() {
    return authors;
    }

    Reply

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