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POClassNotFoundException: derby ClientDriver (Spring MVC + Hibernate JPA)
 

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  1. POClassNotFoundException: derby ClientDriver (Spring MVC + Hibernate JPA)
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    <p>I'm learning Spring MVC, and tried to connect to a database with hibernate. The MVC part worked, and in a separate project, I also could connect and work with the Derby database. But when I tried to put the two together, I failed.</p> <p>root cause:</p> <pre><code>java.lang.NoClassDefFoundError: org/apache/derby/jdbc/ClientDriver hu.pikk.controller.PikkController.test(PikkController.java:42) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:606) org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219 </code></pre> <p>I don't understand why this is, because I put in the maven file the derby dependency:</p> <pre><code>&lt;dependency&gt; &lt;groupId&gt;org.apache.derby&lt;/groupId&gt; &lt;artifactId&gt;derby&lt;/artifactId&gt; &lt;version&gt;10.10.1.1&lt;/version&gt; &lt;/dependency&gt; </code></pre> <p>And I also put the derbyclient.jar file to my classpath:</p> <pre><code>..Java\jdk1.7.0_45\db\lib\derbyclient.jar </code></pre> <p>If anyone has any ideas, why it cannot find the class, I would be pleased to know! I tried to search google and stackoverflow for similar errors, but none of the answers were useful.</p> <p>I tried to create an entitymanager in my controller class in different ways:</p> <p><code></p> <pre><code>@RequestMapping(value={"/","/test"},method = RequestMethod.GET) public String test(ModelMap model) { try { DriverManager.registerDriver(new org.apache.derby.jdbc.ClientDriver()); } catch (SQLException e) { e.printStackTrace(); } ClientDriver driver = new ClientDriver(); // factory = Persistence.createEntityManagerFactory("punit"); //Specified JDBC Driver org.apache.derby.jdbc.ClientDriver could not be loaded // manager = factory.createEntityManager(); // HibernatePersistence hp = new HibernatePersistence(); // factory = hp.createEntityManagerFactory("persistence.xml",null); if(factory!=null){ manager = factory.createEntityManager(); }else{ System.out.println( "### FACTORY IS NULL ### "); } //manager.getTransaction().begin(); //Employee first = manager.find(Employee.class, 1); //manager.getTransaction().commit(); //model.addAttribute("employee", first); if(manager==null){ model.addAttribute("message", "Persistence manager is NULL"); }else{ model.addAttribute("message", "Persistence manager is not NULL! Hurray!"); } return "test"; } </code></pre> <p></code></p>
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