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Editorial Team
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Asked: 2026-05-28T02:41:20+00:00

I’m using the H2 database in my Java project (embedded mode). On my computer

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I’m using the H2 database in my Java project (embedded mode).
On my computer at home everything works, the connection can be established, but on all other computers I always receive the following error:

org.h2.jdbc.JdbcSQLException: Table “CUSTOMERS” not found; SQL
statement: SELECT * FROM CUSTOMERS [42102-162]

I’m sure, that within the DB everything is alright, it should be something with the connection.
But even if I import the h2-1.3.162.jar file, the error still remains.

String dbClass = "org.h2.Driver";
String dbDriver = "jdbc:h2:~/cc";
String user = "user1";
String pass = "test1";
private Connection conn = null;
private Statement stmt = null;
private ResultSet rs = null;

public void connect() {
    boolean done = false;
    //load driver
    try {
        Class.forName(dbClass).newInstance();
        System.out.println("driver loaded"); // This is shown in the Compiler
    } catch (Exception ex) {
        System.out.println("error while loading driver");
        System.err.println(ex);
    }
    // Connection
    try {
        conn = DriverManager.getConnection(dbDriver, user, pass);
        System.out.println("connected"); // This is shown in the Compiler
        done = true;
    } catch (SQLException ex) {
        System.out.println("SQLException: " + ex.getMessage());
        System.out.println("SQLState: " + ex.getSQLState());
        System.out.println("VendorError: " + ex.getErrorCode());
    }
}

public Vector select() {
    data = new Vector();
    try {
        stmt = conn.createStatement();
        rs = stmt.executeQuery("SELECT * FROM CUSTOMERS");
        while (rs.next()) {
            Vector row = new Vector();
            row.add(rs.getInt("id"));
            row.add(rs.getString("fname"));
            row.add(rs.getString("lname"));
            row.add(rs.getString("street"));
            row.add(rs.getString("city"));
            row.add(rs.getString("zip"));
            row.add(rs.getString("state"));
            row.add(rs.getString("phone"));
            row.add(rs.getString("birthday"));
            row.add(rs.getString("email"));
            row.add(rs.getInt("code"));
            data.add(row);
        }
        rs.close();
        stmt.close();
    } catch (SQLException ex) {
        System.out.println("error while selecting"); // I receive this error
        System.err.println(ex);
    }
    return data;
}
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1 Answer

  1. Editorial Team

    Finally I figured it out!

    It had nothing to do with my tables, the database couldn’t be found. When trying to connect to a database which can’t be found with String dbDriver = "jdbc:h2:~/cc";, a new database with the name cc (in my case) will be created (of course an empty one with no tables) and the connection is established. That’s why I haven’t received any connection errors.
    In the next step I tried to retrieve some data from the new created empty database and therefore received the error, that my table doesn’t exist.

    So I changed this line: String dbDriver = "jdbc:h2:file:lib/cc"; and copied into the lib directory of my application my old database cc.h2.db.

    That’s all!

    PS: Here is a similiar problem: h2 (embedded mode ) database files problem

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