java.lang.ClassNotFoundException: com.mysql.jdbc.Driver (maven + jboss)

Question

maven pom.xml

Answer 1

I had a slightly different use case. I was using apache's BasicDataSource in a stand-alone application.

I got this exception because I was calling setDriverClassName with com.mysql.jdbc.Driver.class.toString() instead of "com.mysql.jdbc.Drive" as a String (so compile time check ensures that there is no typo or Driver's location didn't change in a version upgrade... etc).

But!

When you look Driver's implementation it has a static initialization block:

static {
  try {
    java.sql.DriverManager.registerDriver(new Driver());
  } catch (SQLException E) {
    throw new RuntimeException("Can't register driver!");
  }
}

When I wrote com.mysql.jdbc.Driver.class.toString() this initialization block executed too early and caused later on misleading ClassNotFoundException to be thrown. Once I switched to "com.mysql.jdbc.Driver" my application started to work.

This is a case when static becomes evil :)