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[equinox-dev] equinox mysql error

Hi
I'm a chinese student.
I'm writing a plugin that connects to a mysql database, when I used whiting
eclipse it works correctly, however when I try to run it in the standalone
equinox does not works
the message is:
java.sql.SQLException: java.lang.NoClassDefFoundError: javax/naming/RefAddr
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:927)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:431)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:378)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java
:305)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at java.sql.DriverManager.getConnection(Unknown Source)
I have Try
Activator.getContext().getBundle().loadClass(driver).newInstance();

And

Class.forName(driver).newInstance();
connection = DriverManager.getConnection(url + dbName, userName, password);
I also try to add more bundles but still nothing
any help will be appreciate it
thanks in advance