SQL server exception : when using jdbc connection to retrieve data

I use callable interface of Java and try to read the output variable value of a stored procedure written in SQL server.

Stored procedure:

CREATE PROCEDURE [Get_Project_Name_Test] 
    @project_id int,
    @project_name varchar(150) OUTPUT
AS
BEGIN
    SET NOCOUNT ON;
    开发者_C百科SET @project_name = (SELECT Name from Project where Project_Id = @project_id)
END
GO

Here @project_id is input variable and @project_name is output variable. I want to read this value of the output variable from Java application. When I run the code I get a sql exception.

It says:

The formal parameter "@project_id" was not declared as an OUTPUT parameter, but the actual parameter passed in requested output.

Actually, this is not an output parameter. @project_id is the input parameter used to retrieve the result.

Java code which used to call this stored procedure

CallableStatement cstmt = con.prepareCall("{call Get_Project_Name_Test(?)}");
cstmt.setInt(1, 148);
cstmt.registerOutParameter(1, java.sql.Types.VARCHAR);
cstmt.executeQuery();
String x = cstmt.getString(1);
System.out.println(x);

How can I figure out the cause of the error?

Should

cstmt.registerOutParameter(1, java.sql.Types.VARCHAR);

be

 cstmt.registerOutParameter(2, java.sql.Types.VARCHAR);

?