GeronimoTransactionManager transactionManager = (GeronimoTransactionManager) OpenEJB.getTransactionManager();

    Properties props = new Properties();
    props.setProperty("driverClassName", "com.mysql.cj.jdbc.Driver");
    props.setProperty("url", "jdbc:mysql://localhost/test");
    props.setProperty("password", "test");
    props.setProperty("passwordCipher", "PlainText");
    props.setProperty("username", "test");

    try {
        DataSource underlying = new org.apache.tomcat.jdbc.pool.DataSourceFactory().createDataSource(props);
        dataSource = new ManagedDataSource(underlying, transactionManager, transactionManager);
    } catch (Exception e) {
        e.printStackTrace();
    }

Map properties = new HashMap<>();

StringWriter create = new StringWriter();

properties.put("javax.persistence.schema-generation.scripts.action", "create");
properties.put("javax.persistence.schema-generation.scripts.create-target", create);

Persistence.generateSchema("router", properties);