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2013-01-17T03:04:20.930
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2017-05-23T12:08:03.383
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This exception is typical when a single connection is shared between multiple threads. This will in turn happen when your code does not follow the standard JDBC idiom of acquiring and closing the DB resources in the shortest possible scope in the very same <code>try-finally</code> block like so: <pre><code>public Entity find(Long id) throws SQLException { Connection connection = null; // ... try { connection = dataSource.getConnection(); // ... } finally { // ... if (connection != null) try { connection.close(); } catch (SQLException ignore) {} } return entity; } </code></pre> Your comment on the question, <blockquote> @TejasArjun i used connection pooling with servlet Init() method. </blockquote> doesn't give me the impression that you're doing it the right way. This suggests that you're obtaining a DB connection in servlet's <code>init()</code> method and reusing the same one across all HTTP requests in all HTTP sessions. This is absolutely not right. A servlet instance is created/initialized only once during webapp's startup and reused throughout the entire remaining of the application's lifetime. This at least confirms the exception you're facing. Just rewrite your JDBC code according the standard <code>try-finally</code> idiom as demonstrated above and you should be all set. <h3>See also:</h3> <ul> <li><a href="https://stackoverflow.com/questions/9428573/is-it-safe-to-use-a-static-java-sql-connection-instance-in-a-multithreaded-syste/9431863#9431863">Is it safe to use a static java.sql.Connection instance in a multithreaded system?</a></li> </ul>
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1. POjava.sql.SQLRecoverableException: Connection is already in use
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