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PO"where exists" in Hibernate HQL
 

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    <p>How can I write a "not exists" query in HQL? I am trying to get an HQL not exists query which returns the same results as this Oracle SQL query:</p> <pre><code>select * from SCHOOL a where not exists (select 1 from STUDENT b where B.SCHOOL_ID=a.id and B.STATUS_ID not in (0,1,2,3,4)) </code></pre> <p>My mapping files are below:</p> <p> </p> <pre><code> &lt;!-- primary key ommitted --&gt; &lt;set name="students" cascade="all" fetch="select" lazy="false" &gt; &lt;key column="SCHOOL_ID" /&gt; &lt;one-to-many class="com.companyname.Student" /&gt; &lt;/set&gt; &lt;/class&gt; </code></pre> <p> </p> <pre><code> &lt;!-- primary key ommitted --&gt; &lt;many-to-one name="school" column="SCHOOL_ID" class="com.companyname.School" fetch="join" lazy="false"/&gt; &lt;many-to-one name="status" class="com.companyname.Status" column="STATUS_ID" /&gt; &lt;/class&gt; </code></pre> <p> </p> <p>I tried the following tag in my School.hbm.xml file</p> <pre><code>&lt;query name="myQuery"&gt; &lt;![CDATA[ from School s where not exists from Student st where st.school_id=s.id and st.status.id not in (0,1,2,3,4) ]]&gt; &lt;/query&gt; </code></pre> <p>and I got this stack trace</p> <pre><code>org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.NullPointerException Caused by: java.lang.NullPointerException at org.hibernate.hql.ast.HqlParser.negateNode(HqlParser.java:117) at org.hibernate.hql.antlr.HqlBaseParser.negatedExpression(HqlBaseParser.java:2378) at org.hibernate.hql.antlr.HqlBaseParser.logicalAndExpression(HqlBaseParser.java:2331) at org.hibernate.hql.antlr.HqlBaseParser.logicalOrExpression(HqlBaseParser.java:2296) at org.hibernate.hql.antlr.HqlBaseParser.expression(HqlBaseParser.java:2082) at org.hibernate.hql.antlr.HqlBaseParser.logicalExpression(HqlBaseParser.java:1858) at org.hibernate.hql.antlr.HqlBaseParser.whereClause(HqlBaseParser.java:454) at org.hibernate.hql.antlr.HqlBaseParser.queryRule(HqlBaseParser.java:708) at org.hibernate.hql.antlr.HqlBaseParser.selectStatement(HqlBaseParser.java:296) at org.hibernate.hql.antlr.HqlBaseParser.statement(HqlBaseParser.java:159) at org.hibernate.hql.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:248) at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:157) at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:111) at org.hibernate.engine.query.HQLQueryPlan.&lt;init&gt;(HQLQueryPlan.java:77) at org.hibernate.engine.query.HQLQueryPlan.&lt;init&gt;(HQLQueryPlan.java:56) at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:72) at org.hibernate.impl.SessionFactoryImpl.checkNamedQueries(SessionFactoryImpl.java:402) at org.hibernate.impl.SessionFactoryImpl.&lt;init&gt;(SessionFactoryImpl.java:352) </code></pre> <p>Can somebody let me know what I'm doing wrong?</p> <p>Thank you!</p>
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    1. COFYI, the NullPointerException seems to be because I needed parenthesis around my subquery.
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