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POHibernate cannot open connection
 

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    <p>I'm having trouble with hibernate not able to open a connection. I have a DAO:</p> <pre><code>public class MyDao extends HibernateDaoSupport { DataSource dataSource; public void setDataSource(DataSource dataSource) { this.dataSource = dataSource; } public MyPOJO findByQuery(int hour) { Query query = this.getSession().createSQLQuery( "SELECT * FROM MyPOJO WHERE someDate &gt;= DATE_SUB(now(), INTERVAL ? HOUR)") .addEntity(MyPOJO.class); List&lt;MyPOJO&gt; results = query.setInteger(0, hours).list(); return results; } } </code></pre> <p>and then in a test case call findByQuery(1) 8 times, it works, but if I call a 9th time it fails with:</p> <pre><code>org.hibernate.exception.GenericJDBCException: Cannot open connection at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103) at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29) at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:426) at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144) at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:139) at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1547) at org.hibernate.loader.Loader.doQuery(Loader.java:673) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236) at org.hibernate.loader.Loader.doList(Loader.java:2213) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104) at org.hibernate.loader.Loader.list(Loader.java:2099) at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:289) at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1695) at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:142) at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:152) Caused by: org.apache.commons.dbcp.SQLNestedException: Could not retrieve connection info from pool at org.apache.commons.dbcp.datasources.SharedPoolDataSource.getPooledConnectionAndInfo(SharedPoolDataSource.java:169) at org.apache.commons.dbcp.datasources.InstanceKeyDataSource.getConnection(InstanceKeyDataSource.java:631) at org.apache.commons.dbcp.datasources.InstanceKeyDataSource.getConnection(InstanceKeyDataSource.java:615) at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:81) at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:423) ... 35 more Caused by: java.util.NoSuchElementException: Timeout waiting for idle object at org.apache.commons.pool.impl.GenericKeyedObjectPool.borrowObject(GenericKeyedObjectPool.java:827) at org.apache.commons.dbcp.datasources.SharedPoolDataSource.getPooledConnectionAndInfo(SharedPoolDataSource.java:165) ... 39 more </code></pre> <p>This is what my hibernate properties look like:</p> <pre><code>&lt;property name="hibernateProperties"&gt; &lt;props&gt; &lt;prop key="hibernate.dialect"&gt; org.hibernate.dialect.MySQL5Dialect &lt;/prop&gt; &lt;prop key="hibernate.current_session_context_class"&gt; thread &lt;/prop&gt; &lt;prop key="hibernate.format_sql"&gt;false&lt;/prop&gt; &lt;prop key="hibernate.show_sql"&gt;false&lt;/prop&gt; &lt;prop key="hibernate.use_sql_comments"&gt;false&lt;/prop&gt; &lt;prop key="hibernate.jdbc.use_get_generated_keys"&gt;true&lt;/prop&gt; &lt;prop key="hibernate.cache.use_second_level_cache"&gt;true&lt;/prop&gt; &lt;prop key="hibernate.cache.provider_class"&gt; org.hibernate.cache.EhCacheProvider &lt;/prop&gt; &lt;prop key="hibernate.connection.release_mode"&gt;auto&lt;/prop&gt; &lt;/props&gt; &lt;/property&gt; </code></pre> <p>If I change the release_mode to 'after_statement' (ala <a href="http://docs.jboss.org/hibernate/stable/core/reference/en/html_single/#transactions-connection-release" rel="nofollow noreferrer">http://docs.jboss.org/hibernate/stable/core/reference/en/html_single/#transactions-connection-release</a>) it will work, but I don't understand that and feel like that is just a band-aid for something bigger that I am doing wrong.</p> <p>I've also tried to flush and close the this.getSession() with no luck either. I can see the close() gets called AFTER all of the calls to findByQuery(1) have completed.</p> <p>This is on Hibernate 3.2.6, Spring 3.0 and MySQL 5.1. Let me know what more information I can provide.</p>
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    1. COisn't there a `Caused by` of the exception?
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    2. COyes, thanks. See edit.
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