StandardWrapperValve [jsp]：Servlet jsp的Servlet.service（）抛出异常java.lang.IllegalArgumentException：无法将给定对象格式化为日期

Question

I am getting exception in my java jsp servlet code I am getting the error mentioned in the title.
I tried the solution from the link already from stackoverflow which is mentioned below but no use..

My problem is null value is entered into the mysql database..I am stuck in it for two days already..

Java : Cannot format given Object as a Date

 import java.sql.Timestamp;    
 import java.text.ParseException;    
 import java.text.SimpleDateFormat;   
 import java.time.Instant;   
 import java.util.Date;   
 import java.util.logging.Level;   
 import java.util.logging.Logger;

 public class SetDate  
 {  
 public static java.util.Date set(String s,String f)    
 {   
 java.text.SimpleDateFormat sdf=new java.text.SimpleDateFormat(f);    
 java.util.Date date=null;   
 try  
 {    
 date=sdf.parse(s);    
 }     
 catch (ParseException ex)  
 {    
 Logger.getLogger(SetDate.class.getName()).log(Level.SEVERE, null, ex);   
 }      
 return date;     
 }    


public static String format(Object time,String f) throws ParseException   
{      
    SimpleDateFormat sdf=new SimpleDateFormat(f);       
    System.out.println("Date:- " +sdf.format(time));        
    return sdf.format(time);        
}   
}

Error logs:

Warning:   StandardWrapperValve[jsp]: Servlet.service() for servlet jsp   threw exception
java.lang.IllegalArgumentException: Cannot format given Object as a Date      
at java.text.DateFormat.format(DateFormat.java:310)       
at java.text.Format.format(Format.java:157)       
at myweb.tool.SetDate.format(SetDate.java:35)        

Answer 1

Change:

public static String format(Object time,String f) throws ParseException   
{      
    SimpleDateFormat sdf=new SimpleDateFormat(f);       
    System.out.println("Date:- " +sdf.format(time));        
    return sdf.format(time);        
}   

to:

public static String format(Object time,String f) throws ParseException   
{   
    if (time == null) 
        rteurn null;

    SimpleDateFormat sdf=new SimpleDateFormat(f);       
    System.out.println("Date:- " +sdf.format(time));        
    return sdf.format(time);        
}