java.sql.SQLException: No suitable driver found for jdbc:derby:memory:sampledb;create=true

[Russell Bateman]

I have very recent code that works in a JUnit test case.
   @Test
   public void test()
   {
      final String DATABASE = "jdbc:derby:memory:sampledb;create=true";
      final String USERNAME = "sa";
      final String PASSWORD = "sa";

      final String CREATE_TABLE = "CREATE TABLE names ( oid INT
   GENERATED ALWAYS AS IDENTITY, name VARCHAR( 20 ) )";
      final String INSERT_NAME1 = "INSERT INTO names ( name ) VALUES (
   'Jack' )";
      final String QUERY        = "SELECT oid, name FROM names";

      Connection connection = null;

      try
      {
        connection = DriverManager.getConnection( DATABASE, USERNAME,
   PASSWORD );

        Statement statement = connection.createStatement();
        ...

In /pom.xml/, I have the following:

   <dependency>
      <groupId>org.apache.derby</groupId>
      <artifactId>*derby*</artifactId>
      <version>10.15.2.0</version>
      <scope>test</scope>
   </dependency>

I only want to use Derby _in-memory_ backing some unit test cases that 
need a database (not requiring a running server or dæmon, etc.). It all 
works perfectly inside IntelliJ IDEA.

However, when I build from the command line (mvn clean package), I see 
this and can find no solution:

   java.sql.SQLException: No suitable driver found for
   jdbc:derby:memory:sampledb;create=true
        at java.sql.DriverManager.getConnection(DriverManager.java:689)
        at java.sql.DriverManager.getConnection(DriverManager.java:247)
        at
   
com.imatsolutions.database.ApacheDerbyTest.testDirectlyToDerby(ApacheDerbyTest.java:78)

In /pom.xml/, I have tried adding the following, and I have tried many 
other solutions, some of which are supposed to be obsolete ( 
Class.for(...), DriverManager.registerDriver( ... ), etc. ), but cannot 
find a happy solution.

   <dependency>
      <groupId>org.apache.derby</groupId>
      <artifactId>*derbyclient*</artifactId>
      <version>10.15.2.0</version>
      <scope>test</scope>
   </dependency>

Any comment would be welcome.

Thanks.