Home > Error Exception > Error Exception In Thread Awt-eventqueue-0 Java.lang.nullpointerexception

Error Exception In Thread Awt-eventqueue-0 Java.lang.nullpointerexception

Contents

Check your code at line 292 as shown in the error log. ... You can think of your watch list as threads that you have bookmarked. To view your watch list, click on the "My Newsreader" link. Click on the Node corresponding to one Person. click site

users = theBM.getUsers(); aUser = new AdminUser("Tristan Parker", "taparker", "[email protected]", 2); users.addUser(aUser); nUser = new NormalUser("Caroline Williams", "cmwillaims", "[email protected]", 2); users.addUser(nUser); } // Event Handlers private void showUsersDetails() { User selected When the VirtualPage is replaced by a valid instance, there is nothing to display. Not the answer you're looking for? denimjeansButton is your culprit.

Error Exception In Thread Awt-eventqueue-0 Java.lang.nullpointerexception

current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. The default max allocatalbe memory for the java heap in Matlab is 128Mb i think. BR Joel "Nasser Abbasi" wrote in message ... > 2007a, student version on windoz XP SP2. > > I use GUIDE, and after sometime of using it, I notice it Replace List path = new ArrayList(); with path = new ArrayList(); share|improve this answer edited Mar 29 '13 at 16:12 answered Mar 29 '13 at 15:57 Reimeus 122k9102164 add a comment|

Sorry. E Armitage Rancher Posts: 989 9 posted 2 years ago 1.) Use code tags when posting code. 2.) Read the exception message, it's telling you what went and the exact line Campbell Ritchie Sheriff Posts: 50438 82 posted 2 years ago A fewminutes ago, I wrote:It was the line starting pattern = ... . . . The error messages relate to a single error and show the sequence of calls (starting deep in the Swing event handler), via your faulty code, and maybe back into a Java

Articles Forum New Posts FAQ Calendar Forum Actions Mark Forums Read Quick Links Today's Posts Blogs Advanced Search Forum Java Programming New To Java ERROR: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException Results val = new int[subnet.nodes]; for (int j =1;jhttps://coderanch.com/t/639652/GUI/java/Java-GUI-Error-AWT-EventQueue Posted: Sat Feb 20, 2010 3:57 pm Post subject: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException It looks like a simple thing to debug.

share|improve this answer answered Mar 14 '14 at 17:19 chirality 31728 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign Your attributes should be private: private List path; share|improve this answer edited Mar 29 '13 at 16:05 answered Mar 29 '13 at 15:58 user2147970 33716 add a comment| Did you find The only issue is the potential ambiguity about whether you are refering to the field or the variable when you use the name a, and that's not really ambiguous because the more hot questions question feed about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Science

  1. The error reads, run: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at javax.swing.ImageIcon.(ImageIcon.java:167) at Main.initComponents(Main.java:118) at Main.(Main.java:51) at Main$5.run(Main.java:661) at java.awt.event.InvocationEvent.dispatch(Invocation Event.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java: 597) at java.awt.EventDispatchThread.pumpOneEventForFilter s(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarch
  2. Thread To add a thread to your watch list, go to the thread page and click the "Add this thread to my watch list" link at the top of the page.
  3. Posted By esolve (1 replies) Yesterday, 03:06 PM in Hibernate When to use multiple tabs Posted By allDogsAreGood (3 replies) Yesterday, 01:31 AM in New To Java Using self written maven
  4. Join them; it only takes a minute: Sign up Reason for “AWT-EventQueue-0” java.lang.NullPointerException error up vote 2 down vote favorite I'm creating a video game in Java and I am trying
  5. check also ..
  6. Subject: Exception in thread From: Dave Brackett Dave B (view profile) (Dave Brackett) 138 posts Date: 21 Oct, 2008 13:32:01 Message: 4 of 6 Reply to this message Add author to
  7. You are getting the null pointer exception because you didn't set the variable correctly.
  8. Put a breakpoint at val = new int[subnet.nodes]; , run the app in debug mode and step through the code, figure out what is null and then figure out why it

posted 7 years ago The variable num is null, and until you assign a non-null value to it it will remain null. recommended you read plz solve this. Error Exception In Thread Awt-eventqueue-0 Java.lang.nullpointerexception If you didn't, then that's your problem, you need to instantiate that object by calling new Classname( arguments ). Newsgroup content is distributed by servers hosted by various organizations on the Internet.

Campbell Ritchie Sheriff Posts: 50438 82 posted 2 years ago Welcome to the Ranch Don't add code tags as it stands; the long lines which the NetBeans GUI builder produces become get redirected here Naturally you can use this every time you access a field of this, and leaving this off is just a conveninent abbreviation that unfortunately causes some confusion as in this case. In that validateEmail method the OP was using an uninitialized matcher. What you are doing is changing a declaration‑and‑initialisation to a statement.

Henry Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor) James Brandon Greenhorn Posts: 3 posted 7 years ago I don't know how to "correctly set" winterhatButton.addItemListener(this); sportshatButton.addItemListener(this); santahatButton.addItemListener(this); redshirtButton.addItemListener(this); brownshirtButton.addItemListener(this); suitButton.addItemListener(this); denimjeansButton.addItemListener(this); blackpantsButton.addItemListener(this); khakipantsButton.addItemListener(this); //Indicates choices = new StringBuffer("---------"); //Set up the picture label pictureLabel = new JLabel(); pictureLabel.setFont(pictureLabel.getFont().deriveFont(Font.ITALIC)); updatePicture(); //Put the check boxes in a Success! navigate to this website Either remove the reference to the instance variable denimjeansButton or instantiate it.

The form is still messed up when it isn't run (in the creator), but when I run the program it is perfect. asked 2 years ago viewed 67781 times active 1 year ago Linked -2 Comparing Values from a text file with value entered ,Using Java For Login purpose 0 Exception in thread Because normally it tells me "duplicate variable" or something like that.

If it's just the one .java file you can email it to me and I'll check it out for you.

You should work out why there is a null and give it a real value, then all will be well. so no user from the file means nullpointerexception may come.. -1 xy75 -3 5 Years Ago Just replace simple types like int, long etc. I have launched the various tests of the scout james tests with successs. Heres my code and errors: /** * @author j00000927 */ import java.util.Scanner; import java.awt.*; import javax.swing.*; public class ComplexNumberPlot{ //Num is static because I was having trouble calling num.

javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } } Well up to this part it runs smoothly and complies but when I proceed to run the program I Is this still a problem in later Matlab releases? JavaScript and Python are examples of languages that requires this every time, and if you want to do that in Java it would be hard to call you wrong since it my review here Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at javax.swing.plaf.basic.BasicTreeUI$Handler.isActualPath(BasicTreeUI.java:3421) at javax.swing.plaf.basic.BasicTreeUI$Handler.mouseReleasedDND(BasicTreeUI.java:3589) at javax.swing.plaf.basic.BasicTreeUI$Handler.mouseReleased(BasicTreeUI.java:3562) at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272) at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272) at java.awt.Component.processMouseEvent(Component.java:6263) at javax.swing.JComponent.processMouseEvent(JComponent.java:3255) at java.awt.Component.processEvent(Component.java:6028) at java.awt.Container.processEvent(Container.java:2041) at java.awt.Component.dispatchEventImpl(Component.java:4630) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed assignment]$ gedit MainFrame.java . . . [[email protected] Comment 12 Ivan Motsch 2011-11-10 05:32:45 EST Created attachment 206775 [details] Revised patch Comment 13 Matthias Zimmermann 2011-11-10 09:33:05 EST reopend ticket for lukas huser Comment 14 Matthias Zimmermann 2012-02-29 08:00:57 There are several advantages to using MATLAB Central.

To add items to your watch list, click the "add to watch list" link at the bottom of any page. If your going to be coding you really need to learn how to use the debugger to step through your code. posted 7 years ago This line.... Hence your attribute "path" is never initialized.

The forum software retains a copy of the post before I altered it, so I went back to that and used ctrl‑F‑.compile The only match found was in the line I heapTotalMemory = java.lang.Runtime.getRuntime.totalMemory; heapFreeMemory = java.lang.Runtime.getRuntime.freeMemory; if(heapFreeMemory < (heapTotalMemory*0.01)) java.lang.Runtime.getRuntime.gc; end I'm calling the java garbace collector if the free memory drops below a certain limit. Thanks very much... Thanks very much...

Please click the link in the confirmation email to activate your subscription. The exception occurs. Campbell Ritchie Sheriff Posts: 50438 82 posted 2 years ago the initialisation should read private static final String EMAIL_PATTERN = ^[A-Za-z...; Put it all on the one line. Sorry.

more hot questions question feed lang-java about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Code: /* * To change this template, choose Tools | Templates * and open the template in the editor. */ package assignment; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import Try this:- Pattern p = Pattern.compile(null); E Armitage Rancher Posts: 989 9 posted 2 years ago Campbell Ritchie wrote: A fewminutes ago, I wrote:It was the line starting pattern = Other ways to access the newsgroups Use a newsreader through your school, employer, or internet service provider Pay for newsgroup access from a commercial provider Use Google Groups Mathforum.org provides a

So consider whether you should delete the field.