Simple problem? I think so!

Hey folks I got a problem I did not expect because before it worked quite good :-)
I got an jsp page with buttons "ny" for next year and "py" for previous year and the same for day (nd...) and month. the point is, after pressing the ohne of the buttons, in order to change the date an exception occurs, I really dont understand why.
First here is the error message:
org.apache.jasper.JasperException: null
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:367)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:293)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
root cause
java.lang.NumberFormatException: null
     java.lang.Integer.parseInt(Integer.java:436)
     java.lang.Integer.parseInt(Integer.java:518)
     org.apache.jsp.eintragen_jsp._jspService(eintragen_jsp.java:64)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:136)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:320)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:293)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
Second the script for the Eintragen.jsp with date adjusting posibility, which isn�t working:
<begins here>
<HTML>
<HEAD>
<TITLE>Calendar: Termin eintragen</TITLE>
</HEAD>
<BODY BGCOLOR="white">
<tr><td>Sie wollen 1 Seiten eingeben</td></tr><br>
<tr><td>1</td></tr>
<tr><td>Page Title:</td><td><INPUT NAME="p_title" TYPE=TEXT SIZE=50 maxlength=200></td></tr><br>
<table>
<tr><td>Page Level:</td><td><SELECT size="4" name="p_level"><br>
<OPTION value="1">Level 1</OPTION>
<OPTION value="2">Level 2</OPTION>
<OPTION value="3">Level 3</OPTION>
<OPTION value="4">Level 4</OPTION>
<OPTION value="5">Level 5</OPTION>
<OPTION value="6">Level 6</OPTION>
<OPTION value="7">Level 7</OPTION>
<OPTION value="8">Level 8</OPTION>
<OPTION value="9">Level 9</OPTION>
</SELECT></td></tr><br>
<tr><td></td></tr>
</table>
<tr><td>Page Content Owner:</td><td><INPUT NAME="p_co" TYPE=TEXT SIZE=50 maxlength=200></td></tr><br>
<tr><td>Page Review Date:</td><br><br>
<td><button type="input" OnClick="self.location.href='add?date=py'">py</button></td>
<td><button type="input" OnClick="self.location.href='add?date=pm'">pm</button></td>
<td><button type="input" OnClick="self.location.href='add?date=pd'">pd</button></td>
<td><b>2004-05-28</b>
<INPUT NAME="p_review" TYPE="HIDDEN" value="2004-05-28"></td>
<td><button type="input" OnClick="self.location.href='add?date=nd'">nd</button></td>
<td><button type="input" OnClick="self.location.href='add?date=nm'">nm</button></td>
<td><button type="input" OnClick="self.location.href='add?date=ny'">ny</button></td>
</tr>
</BODY>
</HTML>
<ends here>
Then I have a Java class calbean.java which delegates date adjustments to JspCalendar. In turn the Eintragen.jsp should retrieve the adjusted date from calbean.java:
<calbean begins here>
package webeng;
import java.beans.*;
import java.util.*;
import javax.servlet.http.*;
import javax.servlet.*;
public class calBean {
JspCalendar JspCal;
String date;
public calBean () {
this.JspCal = new JspCalendar();
this.date = JspCal.getDate();
public String getDate () {
return this.date;
public void setDate (HttpServletRequest request) {
String dateR = request.getParameter ("date");
if (dateR == null) date = JspCal.getDate ();
else if (dateR.equalsIgnoreCase("ny")) date = JspCal.getNextYear ();
else if (dateR.equalsIgnoreCase("nm")) date = JspCal.getNextMonth ();
else if (dateR.equalsIgnoreCase("nd")) date = JspCal.getNextDay ();
else if (dateR.equalsIgnoreCase("py")) date = JspCal.getPreviousYear ();
else if (dateR.equalsIgnoreCase("pm")) date = JspCal.getPreviousMonth ();
else if (dateR.equalsIgnoreCase("pd")) date = JspCal.getPreviousDay ();
<calbean ends here>
And here I have the JspCalendar which computes dates which works I think, also the calbean because when Eintragen.jsp is first started I got the current date(today) only adjustments are not possible:
<JspCalendar starts here>
* JspCalendar.java
* Created on 09. Mai 2004, 22:10
package webeng;
import java.text.DateFormat;
import java.util.*;
public class JspCalendar {
Calendar calendar = null;
Date currentDate;
int reiter = 0;
public JspCalendar() {
     calendar = Calendar.getInstance();
     Date trialTime = new Date();
     calendar.setTime(trialTime);
public int getYear() {
     return calendar.get(Calendar.YEAR);
public String getMonthe() {
     int m = getMonthInt();
     String[] months = new String [] { "January", "February", "March",
                         "April", "May", "June",
                         "July", "August", "September",
                         "October", "November", "December" };
     if (m > 12)
     return "Unknown to Man";
     return months[m - 1];
public String getDay() {
     int x = getDayOfWeek();
     String[] days = new String[] {"Sunday", "Monday", "Tuesday", "Wednesday",
                    "Thursday", "Friday", "Saturday"};
     if (x > 7)
     return "Unknown to Man";
     return days[x - 1];
public int getMonthInt() {
     return 1 + calendar.get(Calendar.MONTH);
public String getDate() {
int i = getDayOfMonth();
int j = getMonthInt();
if ( i < 10 && j < 10 ) {
     return getYear()+"-0"+getMonthInt()+"-0"+getDayOfMonth();
else if (i < 10 && (j > 10 || j == 10)) {
return getYear()+"-"+getMonthInt()+"-0"+getDayOfMonth();
else if ((i > 10 || i == 10) && j < 10) {
return getYear()+"-0"+getMonthInt()+"-"+getDayOfMonth();
else return getYear()+"-"+getMonthInt()+"-"+getDayOfMonth();
public String getNextDay() {
calendar.set (Calendar.DAY_OF_MONTH, getDayOfMonth() + 1);
return getDate ();
public String getPreviousDay() {
calendar.set (Calendar.DAY_OF_MONTH, getDayOfMonth() - 1);
return getDate ();
public String getPreviousMonth() {
calendar.set (Calendar.MONTH, getMonth() - 1);
return getDate ();
public String getNextMonth() {
calendar.set (Calendar.MONTH, getMonth() + 1);
return getDate ();
public String getNextYear() {
calendar.set (Calendar.YEAR, getYear() + 1);
return getDate ();
public String getPreviousYear() {
calendar.set (Calendar.YEAR, getYear() - 1);
return getDate ();
public int getMonth() {
return calendar.get(Calendar.MONTH);
public String getTime() {
     return getHour() + ":" + getMinute() + ":" + getSecond();
public int getDayOfMonth() {
     return calendar.get(Calendar.DAY_OF_MONTH);
public int getDayOfYear() {
     return calendar.get(Calendar.DAY_OF_YEAR);
public int getWeekOfYear() {
     return calendar.get(Calendar.WEEK_OF_YEAR);
public int getWeekOfMonth() {
     return calendar.get(Calendar.WEEK_OF_MONTH);
public int getDayOfWeek() {
     return calendar.get(Calendar.DAY_OF_WEEK);
public int getHour() {
     return calendar.get(Calendar.HOUR_OF_DAY);
public int getMinute() {
     return calendar.get(Calendar.MINUTE);
public int getSecond() {
     return calendar.get(Calendar.SECOND);
public int getEra() {
     return calendar.get(Calendar.ERA);
public String getUSTimeZone() {
     String[] zones = new String[] {"Hawaii", "Alaskan", "Pacific",
                    "Mountain", "Central", "Eastern"};
     return zones[10 + getZoneOffset()];
public int getZoneOffset() {
     return calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000);
public int getDSTOffset() {
     return calendar.get(Calendar.DST_OFFSET)/(60*60*1000);
public int getAMPM() {
     return calendar.get(Calendar.AM_PM);
public int getDaysPerMonth() {
return calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
<JspCalendar ends here>
I don�t think solving the problem is a big deal, only obviously I am not capable doing it in the moment.
Please help me!
Johannes

The exception is telling you what to look for:
java.lang.NumberFormatException: null
java.lang.Integer.parseInt(Integer.java:436)
java.lang.Integer.parseInt(Integer.java:518)
It's even telling you WHERE to look:
eintragen_jsp.java:64
Line 64 of that .java file is where you'll find the answer.
Why do you need JspCalendar? Seems like most of the functionality you put into it is already available in java.util.Calendar. (I just gave it a quick look.)

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If you have more than one user account, and the one in question is not an administrator account, then temporarily promote it to administrator status in the Users & Groups preference pane. You can demote it back to standard status when this step has been completed.
Triple-click the following line to select it. Copy the selected text to the Clipboard (command-C):
sudo chflags -R nouchg,nouappnd ~ $TMPDIR.. ; sudo chown -R $UID:20 ~ $_ ; chmod -R -N ~ $_ 2> /dev/null
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V). You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up. If you don’t have a login password, you’ll need to set one before you can run the command.
The command will take a noticeable amount of time to run. Wait for a new line ending in a dollar sign (“$”) to appear, then quit Terminal.
Step 2
Boot into Recovery by holding down the key combination command-R at startup. Release the keys when you see a gray screen with a spinning dial.
When the OS X Utilities screen appears, select
Utilities ▹ Terminal
from the menu bar. A Terminal window will open.
In the Terminal window, type this:
resetpassword
That's one word, all lower case, with no spaces. Then press return. A Reset Password window will open. You’re not going to reset a password.
Select your boot volume ("Macintosh HD," unless you gave it a different name) if not already selected.
Select your username from the menu labeled Select the user account if not already selected.
Under Reset Home Directory Permissions and ACLs, click the Reset button.
Select
 ▹ Restart
from the menu bar.

Simple question I think, add JPanel to JScrollPane

I would imagine that for anyone with experience with Java this will be a simple problem. Why can't I add a JPanel to a JScrollPane using myScrollPane.Add(myPanel); ?? it seems to get hidden...
This works correctly:
     //Create a panel
     JPanel panel = new JPanel(new FlowLayout());
     //Make it pink
     panel.setBackground(Color.pink);
     //Make it 400,400
     panel.setPreferredSize(new Dimension(400,400));
     //Create a Scrollpane
     JScrollPane scrollPane = new JScrollPane(panel);
     //Make it 300,300
     scrollPane.setPreferredSize(new Dimension(300,300));
     //Create a JFrame
     JFrame frame = new JFrame("Test Scrollpane");
     frame.setLayout(new FlowLayout());
     //Set close operation
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     //Set its size
     frame.setSize(600,600);
     //Add Scrollpane to JFrame
     frame.add(scrollPane);
     //Show it
     frame.setVisible(true);
This doesnt:
     //Create a panel
     JPanel panel = new JPanel(new FlowLayout());
     //Make it pink
     panel.setBackground(Color.pink);
     //Make it 400,400
     panel.setPreferredSize(new Dimension(400,400));
     //Create a Scrollpane
     JScrollPane scrollPane = new JScrollPane();
     scrollPane.add(panel);
     //Make it 300,300
     scrollPane.setPreferredSize(new Dimension(300,300));
     //Create a JFrame
     JFrame frame = new JFrame("Test Scrollpane");
     frame.setLayout(new FlowLayout());
     //Set close operation
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     //Set its size
     frame.setSize(600,600);
     //Add Scrollpane to JFrame
     frame.add(scrollPane);
     //Show it
     frame.setVisible(true);

rcfearn wrote:
I would appreciate it you could read the sample code, I am asking the question as to why I have to do this? For structural reasons I don't want to have to add the JPanel during instatiation of the JScrollPane...Please read the [jscrollpane api.|http://java.sun.com/javase/6/docs/api/javax/swing/JScrollPane.html] To display something in a scroll pane you need to add it not to the scroll pane but to its viewport. If you add the component in the scroll pane's constructor, then it will be automatically added to the viewport. if you don't and add the component later, then you must go out of your way to be sure that it is added to the viewport with:
JScrollPane myScrollPane = new JScrollPane();
myScrollPane.getViewport().add(myComponent);

Simple problem? I think so!

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