java.text.ParseException: Unparseable date: ""

[jatinkumar patel]

Need help with parsing date. I am new to parsing of date.
Thanks for help

  package stocktrack.struts.form;

import javax.servlet.http.*;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionForm;


import stocktrack.torque.Stock;
import java.text.SimpleDateFormat;
import java.util.Locale;

import stocktrack.struts.form.BaseForm;

/**
 * stocktrack.struts.form.AddTransactionForm class.
 * this class used by Struts Framework to store data from addTransactionForm
 *
 * struts-config declaration:
 * <form-bean name="addTransactionForm"
 *         type="stocktrack.struts.form.AddTransactionForm" />
 *
 * @see org.apache.struts.action.ActionForm org.apache.struts.action.ActionForm
 * Generated by StrutsWizard.
 */

public class AddTransactionForm extends BaseForm {
	public void reset(ActionMapping mapping, HttpServletRequest request) {
		symbol = "";
		date = "";
		shares = "";
		price = "";
	}

	//private static SimpleDateFormat df = new SimpleDateFormat("MM-dd-yyyy");
	private static SimpleDateFormat df = new SimpleDateFormat("MM-dd-yyyy",Locale.US);

	public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) {
		ActionErrors errors = new ActionErrors();

		if (this.isBlankString(symbol)) {    	
			errors.add("symbol", new ActionError("addtransaction.required.SYMBOL"));
		}
		if (this.isBlankString(price)) {
			errors.add("price", new ActionError("addtransaction.required.PRICE"));
		} else {
			if (!this.isDouble(price)) {
				errors.add("price", new ActionError("addtransaction.invalid.price"));
			}
		}
		if (this.isBlankString(shares)) {
			errors.add("shares", new ActionError("addtransaction.required.SHARE"));
		} else {
			if (!this.isDouble(shares)) {
				errors.add("shares", new ActionError("addtransaction.invalid.shares"));
			}
		}
		try {
			System.out.println("---------------------------------------------");
			System.out.println(df.parse(date));
			System.out.println("++++++++++++++++++++++++++++++++++++++++++++");
			if (df.parse(date) == null) {
				errors.add("symbol", new ActionError("addtransaction.invalid.date"));
			} else {
				dateAsLong = df.parse(date).getTime();
			}
		} catch (Exception ex) {
			ex.printStackTrace();
			errors.add("symbol", new ActionError("addtransaction.invalid.date"));
		}
		return errors;
	}

	private String symbol;
	private String date;
	private String shares;
	private long dateAsLong;
	private String price;

	public long getDateAsLong() {
		return dateAsLong;
	}

	public String getSymbol() {
		return symbol;
	}
	public void setSymbol(String symbol) {
		this.symbol = symbol;
	}
	public String getDate() {
		return date;
	}
	public void setDate(String date) {
		this.date = date;
	}
	public String getShares() {
		return shares;
	}

	public double getSharesAsDouble() {
		return Double.parseDouble(this.shares);
	}

	public void setShares(String shares) {
		this.shares = shares;
	}
	public String getPrice() {
		return price;
	}
	public double getPriceAsDouble() {
		return Double.parseDouble(price);
	}
	public void setPrice(String price) {
		this.price = price;
	}
}  

Eoor i am getting

  
java.text.ParseException: Unparseable date: ""
	at java.text.DateFormat.parse(Unknown Source)
	at stocktrack.struts.form.AddTransactionForm.validate(AddTransactionForm.java:61)
	at org.apache.struts.action.RequestProcessor.processValidate(RequestProcessor.java:893)
	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:247)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1292)
	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:492)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Unknown Source)  

[Mahesh Lohi]

In
Private static SimpleDateFormat df = new SimpleDateFormat("MM-dd-yyyy",Locale.US);

I think parsing of MM-dd-yyyy is not posible ("-"). Remove "-" then try it.
To manipulate using the date, use ("MMddyyyy",Locale.US);

If you are not manipulating the data then, don't have to parse.

[Balu Sadhasivam]

In
Private static SimpleDateFormat df = new SimpleDateFormat("MM-dd-yyyy",Locale.US);

I think parsing of MM-dd-yyyy is not posible ("-"). Remove "-" then try it.
To manipulate using the date, use ("MMddyyyy",Locale.US);

If you are not manipulating the data then, don't have to parse.

Its possible to parse date of any format as long as the date matches the format that you are trying to parse.

Here the problem is date is empty and you are trying to parse it.

date = "" //  1
SimpleDateFormat df = new SimpleDateFormat("MM-dd-yyyy",Locale.US);
df.parser(date) // will not work bcoz date is still empty 

First understand the use of parse method , it takes String as argument in the format as passed SimpleDateFormat 's constructor and returns corresponding date object.

[Mahesh Lohi]

Thank you I didn't know it

[jatinkumar patel]

Thanks Balu Sadhasivam and Mahi Lohi for quick reply.


I made the mistake of parsing NULL value, Henceforth i was getting the previous mentioned exception.
So did the following

    
try {
			if (date != ""){
				if (df.parse(date) == null) {
					errors.add("symbol", new ActionError("addtransaction.invalid.date"));
				} else {
					dateAsLong = df.parse(date).getTime();
				}
			}
		} catch (Exception ex) {
			ex.printStackTrace();
			errors.add("symbol", new ActionError("addtransaction.invalid.date"));
		}

Thanks for meaningful and quick help.