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    <p>If you want to create an <strong><code>OR</code> expression</strong> with many <a href="http://docs.jboss.org/hibernate/orm/3.5/api/org/hibernate/criterion/Criterion.html" rel="noreferrer"><code>Criterion</code></a> objects, you can use an instance of <a href="http://docs.jboss.org/hibernate/orm/3.5/api/org/hibernate/criterion/Disjunction.html" rel="noreferrer"><code>org.hibernate.criterion.Disjunction</code></a>. Using this object is equivalent to, but more convenient than, using several OR restrictions. To obtain a <code>Disjunction</code> object, call <a href="http://docs.jboss.org/hibernate/orm/3.5/api/org/hibernate/criterion/Restrictions.html#disjunction%28%29" rel="noreferrer"><code>Restrictions.disjunction()</code></a>.</p> <p>If you need to create an <strong><code>AND</code> expression</strong> with many <code>Criterion</code> objects, you can use an object of <a href="http://docs.jboss.org/hibernate/orm/3.5/api/org/hibernate/criterion/Conjunction.html" rel="noreferrer"><code>org.hibernate.criterion.Conjunction</code></a>. The <a href="http://docs.jboss.org/hibernate/orm/3.5/api/org/hibernate/criterion/Restrictions.html#conjunction%28%29" rel="noreferrer"><code>Restrictions.conjunction()</code></a> method returns a <code>Conjunction</code>.</p> <p>The <code>Disjunction</code> and <code>Conjunction</code> classes provide <code>add()</code> methods to apply an OR or an AND, respectively, between the criteria.</p> <h2>Your case:</h2> <p>In your specific case, you can create an outer <code>Disjunction</code> with two <code>Criterion</code>:</p> <ul> <li><code>Student</code>s who do not have a class;</li> <li>a <code>Conjunction</code> with two <code>Criterion</code>: <ul> <li><code>Student</code>s assigned to a <code>classe</code> belonging to the <code>schoolYear</code> <code>"1"</code>;</li> <li><code>Student</code>s that have <code>pass</code> set to <code>true</code>.</li> </ul></li> </ul> <h2>Sample code:</h2> <p>The following code uses both the <code>Disjunction</code> and <code>Conjunction</code> objects to construct the necessary criteria.</p> <pre><code>Criteria c = session.createCriteria(Student.class) .createAlias("assignements", "a") .createAlias("a.classe","c"); Disjunction or = Restrictions.disjunction(); or.add(Restrictions.isNull("classeActuelle")); Conjunction and = Restrictions.conjunction(); and.add(Restrictions.eq("a.pass", Boolean.TRUE) and.add(Restrictions.eq("c.schoolYear", "1")) or.add(and); c.add(or); // you can use your criteria c now </code></pre>
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    1. COThank you for the explanation and sample code. When I applied the above criteria, the results where the students who only have 'pass' to TRUE and 'schoolYear' to 1. I'm guessing this is because in the criteria, we added two Aliases and the students who have 'classeActuelle' set to 'null' do not actually have an assignement at all and therefore they don't get selected when we add the join with the Assginement and Classe tables... Is there any way I can add a FULL JOIN ?
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    2. COI managed to solve this issue by changing the criteria to: `Criteria c=session.createCriteria(Student.class).createAlias("assignements", "a",Criteria.LEFT_JOIN).createAlias("a.classe", "c", Criteria.LEFT_JOIN);`
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