java.sql.SQLException: com.informix.asf.IfxASFException: Invalid ASF API input parameters.

java.sql.SQLException: com.informix.asf.IfxASFException: Invalid ASF API input parameters.

        at com.informix.jdbc.IfxSqliConnect.<init>(IfxSqliConnect.java:950)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

        at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

        at com.informix.jdbc.IfxDriver.connect(IfxDriver.java:243)

        at java.sql.DriverManager.getConnection(DriverManager.java:571)

        at java.sql.DriverManager.getConnection(DriverManager.java:233)

        at InformixProbeJava.main(InformixProbeJava.java:54)

java.sql.SQLException: com.informix.asf.IfxASFException: Invalid ASF API input parameters.

        at com.informix.jdbc.IfxSqliConnect.<init>(IfxSqliConnect.java:950)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

        at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

        at com.informix.jdbc.IfxDriver.connect(IfxDriver.java:243)

        at java.sql.DriverManager.getConnection(DriverManager.java:571)

        at java.sql.DriverManager.getConnection(DriverManager.java:233)

        at InformixProbeJava.main(InformixProbeJava.java:54)

java.lang.NullPointerException
        at InformixProbeJava.main(InformixProbeJava.java:71)

原因：

连接不上数据库，请检查用户名和密码，连接串