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POJPA, Spring, Hibernate problem with loading entities ManyToMany Assotiation
 

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  1. POJPA, Spring, Hibernate problem with loading entities ManyToMany Assotiation
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    <p>I'm trying to get data from assotiation N:N, but I receive blank field.<br> There are my Hibernate mapping class:</p> <pre><code>@Entity @Table(name = "companies") public class Company extends NamedEntity { //some_code @ManyToMany( targetEntity = com.hqcargo.shippingstock.domain.CompanyProfile.class, cascade = {CascadeType.ALL, CascadeType.ALL }, fetch = FetchType.EAGER ) @JoinTable( name = "company_company_profiles", joinColumns = {@JoinColumn( name = "company_id", referencedColumnName = "id") }, inverseJoinColumns = {@JoinColumn( name = "company_profile_id", referencedColumnName = "id") } ) private List&lt;CompanyProfile&gt; profiles; // getters and setters + other code </code></pre> <p>other class:</p> <pre><code>@Entity @Table(name = "company_profiles") public class CompanyProfile extends NamedEntity { //some_code @ManyToMany( targetEntity = com.hqcargo.shippingstock.domain.Company.class, cascade = {CascadeType.ALL, CascadeType.ALL }, mappedBy = "profiles", fetch = FetchType.EAGER ) @JoinTable( name = "company_company_profiles", joinColumns = {@JoinColumn( name = "company_profile_id", referencedColumnName = "id") }, inverseJoinColumns = {@JoinColumn( name = "company_id", referencedColumnName = "id") } ) private List&lt;Company&gt; companies; // getters and setters + other code </code></pre> <p>This classes works fine with saving but not with loading data.<br> Below I add DAO class:</p> <pre><code>public class CompanyJpaDAO extends JpaDaoSupport implements CompanyDAO { @Transactional(readOnly = true) public Company readById(Long id) { Company tempCompany = getJpaTemplate().find(Company.class, id); return tempCompany; } } @Transactional public void update(Company existingInstance) { if (existingInstance.isNew()) { throw new InvalidDataAccessApiUsageException( "Can't update record. Given instance don't have assigned ID"); } save(existingInstance); } </code></pre> <p>when I update every is ok (generated sql by Hibernate):</p> <pre><code>251252 [13627369@qtp-8132032-9] DEBUG org.hibernate.SQL - update companies set name=?, where id=? Hibernate: update companies set name=?, where id=? 251295 [13627369@qtp-8132032-9] DEBUG org.hibernate.SQL - insert into company_company_profiles (company_id, company_profile_id) values (?, ?) Hibernate: insert into company_company_profiles (company_id, company_profile_id) values (?, ?) </code></pre> <p>but when I load data i don't get info from company_company_profiles (sql generated by Hibernate)</p> <pre><code>36088 [13507994@qtp-8132032-13] DEBUG org.hibernate.SQL - select companies0_.company_profile_id as company2_8_, companies0_.company_id as company1_8_, company1_.id as id3_0_, company1_.name as name3_0_, from company_company_profiles companies0_ left outer join companies company1_ on companies0_.company_id=company1_.id where companies0_.company_profile_id=? Hibernate: select companies0_.company_profile_id as company2_8_, companies0_.company_id as company1_8_, company1_.id as id3_0_, company1_.name as name3_0_, from company_company_profiles companies0_ left outer join companies company1_ on companies0_.company_id=company1_.id where companies0_.company_profile_id=? </code></pre> <p>Do you see any mistakes in my code?</p>
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    1. PTQuestion
    1. USPascal Thivent
    1. USMichał Rowicki
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      1. POJPA, Spring, Hibernate problem with loading entities ManyToMany Assotiation
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

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