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POHibernate: getting not-null property references a null or transient value
 

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    <p>I am new to Hibernate. I have two classes "quotation" and "quotation_item" their database structure is like this</p> <pre><code>create table quotation ( quotation_id int primary key auto_increment, code varchar(20), client_name varchar(20) ); create table quotation_item ( id int primary key auto_increment, quotation_id int, item_name varchar(20), rate int, qty int, FOREIGN KEY (quotation_id) REFERENCES quotation(quotation_id) ); </code></pre> <p>Quotation.hbm.xml is like this, <code></p> <pre><code> &lt;hibernate-mapping&gt; &lt;class name="com.paramatrix.pojo.Quotation" table="quotation"&gt; &lt;id name="quotationId" type="int" column="quotation_id"&gt; &lt;generator class="native" /&gt; &lt;/id&gt; &lt;property name="code" column="code" type="string" /&gt; &lt;property name="clientName" column="client_name" type="string" /&gt; &lt;set name="quotationItem" table="quotation_item" fetch="select" cascade="all"&gt; &lt;key&gt; &lt;column name="quotation_id" not-null="true" /&gt; &lt;/key&gt; &lt;one-to-many class="com.paramatrix.pojo.QuotationItem" /&gt; &lt;/set&gt; &lt;/class&gt; &lt;/hibernate-mapping&gt; </code></pre> <p>QuotationItem.hbm.xml is like this,</p> <pre><code>&lt;hibernate-mapping&gt; &lt;class name="com.paramatrix.pojo.QuotationItem" table="quotation_item"&gt; &lt;id name="id" type="int" column="id"&gt; &lt;generator class="native" /&gt; &lt;/id&gt; &lt;many-to-one name="quotation" class="com.paramatrix.pojo.Quotation" cascade="save-update"&gt; &lt;column name="quotation_id" not-null="true" /&gt; &lt;/many-to-one&gt; &lt;property name="itemName" column="item_name" type="string" /&gt; &lt;property name="rate" column="rate" type="int" /&gt; &lt;property name="qty" column="qty" type="int" /&gt; &lt;/class&gt; &lt;/hibernate-mapping&gt; </code></pre> <p></code></p> <p>POJO's are 1>Quotation.java</p> <pre><code>public class Quotation { int quotationId; String code; String clientName; Set&lt;QuotationItem&gt; quotationItem=new HashSet&lt;QuotationItem&gt;(); //getter&amp; setter } </code></pre> <p>2>QuotationItem.java</p> <pre><code>public class QuotationItem{ int id; Quotation quotation; String itemName; int rate; int qty; //getter and setter } </code></pre> <p>main method is </p> <pre><code>Set&lt;QuotationItem&gt; set=new HashSet&lt;QuotationItem&gt;(); SessionFactory factory = new Configuration().configure().buildSessionFactory(); Session session=factory.openSession(); session.beginTransaction(); Quotation quotation = new Quotation(); quotation.setCode(txtCode.getValue()); quotation.setClientName(txtClientName.getValue()); QuotationItem quotationItem = new QuotationItem(); quotationItem.setItemName(txtItemName.getValue()); quotationItem.setQty(Integer.parseInt( txtQty.getValue())); quotationItem.setRate(Integer.parseInt(txtRate.getValue())); set.add(quotationItem); quotation.setQuotationItem(set); session.saveOrUpdate((quotation)); session.getTransaction().commit(); System.out.println("Done"); </code></pre>
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