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PObidirectional hibernate relationship
 

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    <p>I have a web application using hibernate and the following entities. What am I doing wrong?</p> <pre><code>... @Entity public class Registration implements BaseEntity { ... @OneToMany(cascade = {CascadeType.PERSIST}, mappedBy = "registration", fetch = FetchType.EAGER) private List&lt;OrderedProduct&gt; orderedProducts = new ArrayList&lt;OrderedProduct&gt;(); ... public List&lt;OrderedProduct&gt; getOrderedProducts() { return orderedProducts; } public void setOrderedProducts(List&lt;OrderedProduct&gt; orderedProducts) { this.orderedProducts = orderedProducts; } ... </code></pre> <hr> <pre><code>... @Entity public class OrderedProduct implements BaseEntity { ... @ManyToOne @JoinColumn(name = "registration_id",nullable = true) private Registration registration; ... public Registration getRegistration() { return registration; } public void setRegistration(Registration registration) { this.registration = registration; } ... </code></pre> <hr> <p>When I use this, I get the following Tomcat Error:</p> <pre><code>Caused by: org.hibernate.AnnotationException: Illegal use of mappedBy on both sides of the relationship: at.irian.conference.domain.Registration.orderedProducts at org.hibernate.cfg.annotations.TableBinder.bindFk(TableBinder.java:193) at org.hibernate.cfg.annotations.CollectionBinder.bindCollectionSecondPass(CollectionBinder.java:1325) at org.hibernate.cfg.annotations.CollectionBinder.bindManyToManySecondPass(CollectionBinder.java:1164) at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:602) at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:543) at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:66) at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1163) at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:329) at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1148) at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1226) at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:173) at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:854) at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:425) at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:131) at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:221) at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:251) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1288) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1257) ... 86 more </code></pre>
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    1. COWhat is your relation looks like? Registration[1] -> [0..n]OrderProducts, and you want to map it bi-directional?
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    2. COone registration has many orderedProducts => 1:n
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