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POGeneration query when the ManyToMany relationship is used by Spring Data Jpa project
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  1. POGeneration query when the ManyToMany relationship is used by Spring Data Jpa project
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    copied!<p>I've the following entities mapping:</p> <pre><code>@Entity @Table(name = "books") public class Book implements Serializable { @ManyToMany @JoinTable(name="books2categories", joinColumns=@JoinColumn(name="book_id"), inverseJoinColumns=@JoinColumn(name="category_id")) Collection&lt;Category&gt; categories; </code></pre> <p>...</p> <pre><code>@Entity @Table(name = "categories") public class Category implements Serializable { @ManyToMany(mappedBy="categories") private Collection&lt;Book&gt; books; </code></pre> <p>BookRepository interface is looked:</p> <pre><code>public interface BookRepository extends JpaRepository&lt;Book, Long&gt; { @Query("SELECT b FROM Book b INNER JOIN b.categories c WHERE c IN (:categories)") List&lt;Book&gt; findByCategories(Collection&lt;Category&gt; categories); </code></pre> <p>Please fix me if I'm wrong in the query itself. When I run test for the <code>findByCategories</code> method, I'm getting the error:</p> <blockquote> <p>testFindByCategories(com.savdev.springmvcexample.repository.JpaBookRepositoryTest): org.hibernate.QueryParameterException: Position beyond number of declared ordinal parameters. Remember that ordinal parameters are 1-based! Position: 1; nested exception is java.lang.IllegalArgumentException: org.hibernate.QueryParameterException: Position beyond number of declared ordinal parameters. Remember that ordinal parameters are 1-based! Position: 1</p> </blockquote> <p>Which option do I have to resolve it?</p> <p>And the second, can I debug Spring Data Jpa logic that passes the argument into the query? I'm getting a proxy returned by Spring Data Jpa, cannot understand where to use break point to debug this behaviour.</p> <p>UPDATE: I've fixed it by using <code>(?1)</code>:</p> <pre><code>@Query("SELECT b FROM Book b INNER JOIN b.categories c WHERE c IN (?1)") </code></pre> <p>instead of </p> <pre><code>@Query("SELECT b FROM Book b INNER JOIN b.categories c WHERE c IN (:categories)") </code></pre>
 

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