fix postgres connection issue #695 with redshift driver in classpath

h2/src/main/org/h2/util/JdbcUtils.java

@@ -11,11 +11,7 @@ import java.io.IOException;
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
 import java.io.ObjectStreamClass;
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.ResultSet;
-import java.sql.SQLException;
-import java.sql.Statement;
+import java.sql.*;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.Properties;
@@ -294,7 +290,12 @@ public class JdbcUtils {
         } else {
             Class<?> d = loadUserClass(driver);
             if (java.sql.Driver.class.isAssignableFrom(d)) {
-                return DriverManager.getConnection(url, prop);
+                try {
+                    Driver driverInstance = (Driver) d.newInstance();
+                    return driverInstance.connect(url, prop);
+                } catch (Exception e) {
+                    throw DbException.toSQLException(e);
+                }
             } else if (javax.naming.Context.class.isAssignableFrom(d)) {
                 // JNDI context
                 try {