连接informix数据库时出错,什么原因呢?

出错信息java.sql.SQLException: 详细信息文档会在以后的版本中提供。 java.lang.IndexOutOfBoundsException
        at com.informix.util.IfxErrMsg.getSQLException(IfxErrMsg.java:448)
        at com.informix.jdbc.IfxSqliConnect.<init>(IfxSqliConnect.java:1035)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstruct
orAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingC
onstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
        at com.informix.jdbc.IfxDriver.connect(IfxDriver.java:254)
        at java.sql.DriverManager.getConnection(DriverManager.java:525)
        at java.sql.DriverManager.getConnection(DriverManager.java:193)
        at InfoConnection.getConnection(InfoConnection.java:22)
        at InfoConnection.getUsers(InfoConnection.java:59)
        at InfoConnection.print(InfoConnection.java:78)
        at InfoConnection.main(InfoConnection.java:90)
.....................................................................................
代码是:
Class.forName("com.informix.jdbc.IfxDriver").newInstance();

}

public Connection getConnection()throws Exception{

return java.sql.DriverManager.getConnection("jdbc:informix-sqli://192.168.1.66:23/mydatabase:"
                    + "INFORMIXSERVER=;user=informix;password=123456");  
}是连接其它机子得数据库,java.lang.IndexOutOfBoundsException是说下界溢出吗?
为什么会溢出?谢谢!