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copied!<p>You cannot access <code>dataSource</code> in the constructor. Spring first instantiates the bean (using the default constructor in your case) and then wires the properties.</p> <p>There are <a href="http://static.springsource.org/spring/docs/3.1.x/spring-framework-reference/html/beans.html#beans-factory-lifecycle-initializingbean" rel="nofollow">a number of ways</a> to deal with that.</p> <p><strong>Constructor injection</strong></p> <pre><code><bean id="jdbcTest" class="org.springdemo.jdbc.JdbcTest"> <constructor-arg ref="dataSource"/> </bean> </code></pre> <p>And class</p> <pre><code>public class JdbcTest { private DataSource dataSource; public JdbcTest(DataSource dataSource) throws SQLException { this.dataSource = dataSource; conn = dataSource.getConnection(); stmt = conn.createStatement(); } } </code></pre> <p><strong>InitializingBean</strong></p> <pre><code>public class JdbcTest implements InitializingBean { private DataSource dataSource; // setter for dataSource public void afterPropertiesSet() { // run the actual test onn = dataSource.getConnection(); stmt = conn.createStatement(); } } </code></pre> <p><strong>Init method</strong></p> <pre><code><bean id="jdbcTest" class="org.springdemo.jdbc.JdbcTest" init-method="runTest"> <property name="dataSource" ref="dataSource"/> </bean> </code></pre> <p>And class</p> <pre><code>public class JdbcTest { private DataSource dataSource; // setter for dataSource public void runTest() { // run the actual test } } </code></pre>

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