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Re: Can't connect to MySQL in Java EE/JBoss application
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created by <a href="https://community.jboss.org/people/krzemian">Sz Krze</a> in <i>Datasource Configuration</i> - <a href="https://community.jboss.org/message/757583#757583">View the full discussion</a>
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<div class="jive-rendered-content"><p>All right, I've repeated all the steps from the beginning as a fresh morning man and it worked. Still don't know why, but here're a few things that <strong>might've solved</strong> the problem:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Here're the steps I've followed (<span style="text-decoration: line-through;">I've just replicated them to be sure they're still not working</span>):</p><ol><li>Downloaded mysql-connector-java-5.0.8-bin.jar from <a class="jive-link-external-small" href="http://www.mysql.com/downloads/connector/j/5.0.html#downloads">http://www.mysql.com/downloads/connector/j/5.0.html#downloads</a> </li><li>Placed it in jboss-6.0.0.Final\server\default\lib</li><li>Created a new Connection Profile in Eclipse using Data Source Explorer (I don't know if that step is even necessary). In the wizard I've also created a new Driver Definition using the 5.0.8 connector. The ping succeeded and my database is visible from within the Data Source Explorer.</li><li>Generated -ds.xml file from the CP mentioned in 3) using File->New->Other...->JBoss Tools Web->JBoss Datasource (-ds.xml) (using AS5 format) and placed it in jboss-6.0.0.Final\server\default\deploy\Mysql_local-ds.xml <span style="text-decoration: line-through;">as well as project's META-INF\Mysql_local-ds.xml</span> (<strong>corrected: when I placed it in both places simultaneously, I received ERROR [org.jboss.kernel.plugins.dependency.AbstractKernelController] Error installing to Real: (...) Caused by: java.lang.IllegalStateException: jboss.jca:name=MP01Datasource2,service=ManagedConnectionFactory is already installed.</strong></li><li>I've added the db's jar to build path usign [rmb on project]->Build Path->Configure Build Path...->Add Library->Connectivity Driver Definition and chose the one I've defined in 3)</li></ol><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I have also deleted some old .jar deployments from my other test projects that got stuck in the workspace\.metadata\.plugins\org.jboss.ide.eclipse.as.core\JBoss_6.x_Runtime_Server1345902635716\deploy folder (supposedly due to incorrect shutdown), but I sincerely doubt that was what helped.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I suppose the main cause might've been that as I was swapping the drivers and Driver Definitions (I've been moving from 5.1.sth to 5.0.8) I forgot to swap them in the pj's build path as well and involuntarily left the old one.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>My current <strong>persistence.xml</strong></p><p><?xml version="1.0" encoding="UTF-8"?></p><p><span><persistence xmlns="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence" target="_blank">http://java.sun.com/xml/ns/persistence</a><span>" xmlns:xsi="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema-instance" target="_blank">http://www.w3.org/2001/XMLSchema-instance</a><span>"</span></p><p><span>       xsi:schemaLocation="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence" target="_blank">http://java.sun.com/xml/ns/persistence</a><span> </span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd" target="_blank">http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd</a><span>"</span></p><p>       version="2.0"></p><p>  <persistence-unit name="mp" transaction-type="JTA"></p><p>    <jta-data-source>java:/MP01Datasource2</jta-data-source> </p><p>           <properties></p><p>       <!--s</p><p>       <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/></p><p>       --></p><p>       <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/></p><p>       <property name="hibernate.hbm2ddl.auto" value="create-drop"/></p><p>   </properties></p><p>  </persistence-unit></p><p></persistence></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong>Mysql_local-ds.xml</strong></p><p><?xml version="1.0" encoding="UTF-8"?></p><p><!DOCTYPE datasources</p><p>    PUBLIC "-//JBoss//DTD JBOSS JCA Config 1.5//EN"</p><p><span>    "</span><a class="jive-link-external-small" href="http://www.jboss.org/j2ee/dtd/jboss-ds_1_5.dtd" target="_blank">http://www.jboss.org/j2ee/dtd/jboss-ds_1_5.dtd</a><span>"></span></p><p><datasources></p><p>   </p><p>   <local-tx-datasource></p><p>      <jndi-name>MP01Datasource2</jndi-name></p><p>      <use-java-context>true</use-java-context></p><p>      <connection-url>jdbc:mysql://localhost:3306/mp</connection-url></p><p>      <driver-class>com.mysql.jdbc.Driver</driver-class></p><p>      <user-name>x</user-name></p><p>      <password>y</password></p><p>   </local-tx-datasource></p><p>    </p><p></datasources></p><p><strong><br/></strong></p><p><strong><br/></strong></p></div>
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