問題
NetBeanのHibernateツールによって生成される注釈による以下のHibernateマッピングを参照してください。
File:Stock.java
package com.mkyong.stock.model;//... @Entity @Table(name = "stock", catalog = "mkyong"); public class Stock implements java.io.Serializable { //... private Set stockCategories = new HashSet(0); @OneToMany(fetch = FetchType.LAZY, mappedBy = "stock") public Set getStockCategories() { return this.stockCategories; } public void setStockCategories(Set stockCategories) { this.stockCategories = stockCategories; } }
File:StockCategory.java
package com.mkyong.stock.model;//... @Entity @Table(name = "stock__category", catalog = "mkyong"); public class StockCategory implements java.io.Serializable { private Stock stock; //... @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "STOCK__ID", nullable = false) public Stock getStock() { return this.stock; } }
プログラムが実行されているときは、次の例外が発生します。
Caused by: org.hibernate.AnnotationException: Collection has neither generic type or OneToMany.targetEntity() defined: com.mkyong.stock.model.Stock.stockCategories
解決策
これを修正するには、関係変数に正確なデータ型を宣言します。関係変数には、 `@ OneToMany`アノテーションが付いています。下記を参照してください。
File:Stock.java
package com.mkyong.stock.model;//... @Entity @Table(name = "stock", catalog = "mkyong"); public class Stock implements java.io.Serializable { //... private Set<StockCategory> stockCategories = new HashSet(0); @OneToMany(fetch = FetchType.LAZY, mappedBy = "stock") public Set getStockCategories() { return this.stockCategories; } public void setStockCategories(Set<StockCategory> stockCategories) { this.stockCategories = stockCategories; } }