Mallikharjuna Areti [https://community.jboss.org/people/malli002] created the discussion "Database driver problem" To view the discussion, visit: https://community.jboss.org/message/754138#754138 -------------------------------------------------------------- I am trying to configure few datasources in my environment and getting below driver problem. i have tried with *ojdbc6.jar file and ojdbc14.jar* file in the classpath. If i use ojdbc6.jar file i will get class not found exception like below with sealing violation ..etc where as if i use ojdbc14.jar file i will get class cast exception. Basically what i understood is it's driver mismatch or something but not able to identify where could be the problem. I have tried all the ways, from my side if anyone have any idea about this or any clue please suggest me. I can give you more clarity on the problem if required. Few extra details :- java version - 1.6.0.20 Jboss version - 5.1 +Caused by: java.lang.NoClassDefFoundError: oracle/jdbc/driver/OracleDriver+ +        at oracle.jdbc.pool.OracleDataSource.<init>(OracleDataSource.java:85)+ +        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)+ +        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)+ +        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)+ +        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)+ +        at java.lang.Class.newInstance0(Class.java:355)+ +        at java.lang.Class.newInstance(Class.java:308)+ +        at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.getDriver(LocalManagedConnectionFactory.java:481)+ +        at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.getLocalManagedConnection(LocalManagedConnectionFactory.java:206)+ +        ... 98 more+ *+Caused by: java.lang.ClassNotFoundException: Unexpected error during load of: oracle.jdbc.driver.OracleDriver, msg=Sealing violation for package oracle.jdbc.driver+* +        at org.jboss.classloader.spi.base.ClassLoaderManager.process(ClassLoaderManager.java:181)+ +        at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:276)+ +        at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:1138)+ +        at org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(BaseClassLoader.java:862)+ +        at org.jboss.classloader.spi.base.BaseClassLoader.doLoadClass(BaseClassLoader.java:502)+ +        at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:447)+ +        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)+ +       ... 107 more+ Here is my one of DS.xml file +<datasources>+ +      <local-tx-datasource>+ +        <jndi-name>jdbc/<JNDI NAME></jndi-name>+ +        <connection-url>jdbc:orcale:thin:@<servername>:<port>:<schema_name></connection-url>+ +        <driver-class>oracle.jdbc.pool.OracleDataSource</driver-class>+ +        <security-domain>DataSourceDBLogin</security-domain>+ +        <exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.OracleExceptionSorter</exception-sorter-class-name>+ +        <metadata>+ +          <type-mapping>Oracle11g</type-mapping>+ +        </metadata>+ +        <min-pool-size>5</min-pool-size>+ +        <max-pool-size>20</max-pool-size>+ +        <idle-timeout-minutes>15</idle-timeout-minutes>+ +      </local-tx-datasource>+ +    </datasources>+ ++ -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/754138#754138] Start a new discussion in Datasource Configuration at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]