Conexión manual a BD Informix como recurso JNDI
import org.springframework.mock.jndi.SimpleNamingContextBuilder;
import com.informix.jdbcx.IfxDataSource;
final IfxDataSource ds = new IfxDataSource();
ds.setIfxIFXHOST("1.2.3.4");
ds.setPortNumber(5000);
ds.setUser("user");
ds.setPassword("clave");
ds.setServerName("ids_server");
ds.setDatabaseName("dbname");
final SimpleNamingContextBuilder builder = new SimpleNamingContextBuilder();
builder.bind("java:/RESNAME", ds);
builder.activate();