Search DaniWeb - classcastexception

ClassCastException 13 Years Ago by ceyesuma … extend models Exception in thread "main" java.lang.ClassCastException: model.dao.ConnectStudentDAO cannot be cast to view.bean.StudentBean… ClassCastException where 2 jsp pages refer to 2 classes in same package 14 Years Ago by dangari … Tomcat's stacktrace: [CODE] org.apache.jasper.JasperException: java.lang.ClassCastException: mypackage.myclass1 cannot be cast to mypackage.myclass2 [/CODE] if… following similar message: [CODE] org.apache.jasper.JasperException: java.lang.ClassCastException: mypackage.myclass2 cannot be cast to mypackage.myclass1 [/CODE] Please… classcastexception in the jsp file and how to fix it 16 Years Ago by mrityunjay22 …> </BODY> </HTML> i am getting classcastexception in the line description = ((String)((Vector)rSet2.elementAt(1)).elementAt… ClassCastException confusion 11 Years Ago by rahul.ch Compiles fine. But at runtime it gives ClassCastException. My doubt is that why is it so even though st which is of type Sample1 gets casted to Sample2 and generates exception even though Sample2 IS-A Sample1. Re: ClassCastException 13 Years Ago by stultuske well .. for one, studentBean is an instance of StudentBean, newStudent is an instance of Student and if I may ask, what is this: StudentBean studentBean=(StudentBean) supposed to do? you'll need to finish the line by placing a ';' and even with that, doesn't really look very ... looking for the right word, just not finding it at the moment ... to … JList DefaultListModel ClassCastException 16 Years Ago by yoyodelta …]Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.JList$4 cannot be cast to javax.swing… Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.JCom 14 Years Ago by lwschjang …. Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.JComboBox cannot be cast to javax.swing.JTextField… java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer 13 Years Ago by ashwiniku hi, i am getting below error plz help java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer … Re: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer 13 Years Ago by ashwiniku … is coming Exception in thread "main" java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer… Re: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer 13 Years Ago by ~s.o.s~ … is coming Exception in thread "main" java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer… Re: ClassCastException where 2 jsp pages refer to 2 classes in same package 14 Years Ago by masijade That should only happen if you have used the same id in both cases. Re: ClassCastException where 2 jsp pages refer to 2 classes in same package 14 Years Ago by dangari [QUOTE=masijade;1105868]That should only happen if you have used the same id in both cases.[/QUOTE] OOh..so simple yet so true...thanks masijade...I don't know why I overlooked the [B]id[/B]...Thanks again. Re: ClassCastException confusion 11 Years Ago by JamesCherrill st is a copy of s1, which is a ref to a Sample1. You then try to cast that so Sample2, which is invalid. The relevant rule is that you can cast a subclass to it superclass, but not vice-versa. This is because every Sample2 is, by definition a Sample1, but not every Sample1 is a Sample2 (all Cats are Animals, but not all Animals are CAts). Re: ClassCastException confusion 11 Years Ago by rahul.ch Hello james, when you say "ref to a Sample1", your talking about st's Ref Var Type or st's Object type? Because if we omit line 14 st=s1 and then run the o/p is met2. So I'm guessing it's based on Object type, i.e after omitting line 14, Sample1 st = s2 makes st's Object type as Sample2 and hence the casting is successful. Am I … Re: ClassCastException confusion 11 Years Ago by JamesCherrill It can be very confusing to talk about var's and object's types, so I'm going to stick to the proper Java terminology. st is a reference variable that can only refer to objects of type Sample1 or any subclass of Sample1. `(Sample2) st` creates a reference that can only refer to objects of type Sample2 (or any subclass of Sample2). At compile … Re: ClassCastException confusion 11 Years Ago by rahul.ch Ya that does it :) Thanks again James! Re: java.lang.ClassCastException 15 Years Ago by stephen84s … object of type JComboBox) and hence the JVM threw the ClassCastException when that object generated some ActionEvent. Also next time please… Re: java.lang.ClassCastException 15 Years Ago by vikas_java Thanks.I get this exception java.lang.ClassCastException : javax.swing.JButton cannot be cast to javax.swing.JComboBox I want to get the value of combobox and when click on next button that value will pass to [B]check[/B] class object. what can I do to overcome this problem. Re: JList DefaultListModel ClassCastException 16 Years Ago by yoyodelta Finally figured out the problem: When I called times.setListData(Object[] array) JList constructs a [B]new[/B] instance of the ListModel based on its own internal, incompatible with DefaultListModel, ListModel; as if I never used the constructor passing in a DefaultListModel. Data then must be added one at a time. Re: Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.JCom 14 Years Ago by Ezzaral e.getSource() returns the component that generated the event, which in your case is the combo box. You cannot cast that JComboBox reference to a JTextField. Re: Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.JCom 14 Years Ago by lwschjang [QUOTE=Ezzaral;1189844]e.getSource() returns the component that generated the event, which in your case is the combo box. You cannot cast that JComboBox reference to a JTextField.[/QUOTE] Ok, I got you. I commented out the[CODE]JTextField bCTotal = (JTextField)e.getSource();[/CODE] in each if statement. When I did that and selected a quantity, … Re: Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.JCom 14 Years Ago by Ezzaral You can get the selected object from the combo box directly with [URL="http://java.sun.com/javase/6/docs/api/javax/swing/JComboBox.html#getSelectedItem()"]getSelectedObject()[/URL]If you already have a reference to combo box, you can use it directly, otherwise you can cast the event source [iCODE](JComboBox)e.getSource()[/iCODE] and use … Re: Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.JCom 14 Years Ago by lwschjang [QUOTE=Ezzaral;1189863]You can get the selected object from the combo box directly with [URL="http://java.sun.com/javase/6/docs/api/javax/swing/JComboBox.html#getSelectedItem()"]getSelectedObject()[/URL]If you already have a reference to combo box, you can use it directly, otherwise you can cast the event source [iCODE](JComboBox)e.… Re: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer 13 Years Ago by javaAddict The error is very clear: [QUOTE]java.lang.String cannot be cast to java.lang.Integer[/QUOTE] You are trying to cast a String object to an Integer. That cannot be done. They are not of the same type. The error tells you at what line of your file that happened, so you can correct it. Don't expect us to count all that code line by line, until … Re: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer 13 Years Ago by peter_budo From snippet you provided it is difficult to find out where you are casting string to integer, but I have feeling that it is somewhere in this loop [code] for(int i=lastIndexOfOne;i<oracleCrns.size();i++) { if(leftOverCrns.contains(oracleCrns.get(i))) {continue;} else leftOverCrns.add(oracleCrns.get(i)); }[/code] You … Re: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer 13 Years Ago by javaAddict At that line you call: [CODE] db2Crns=testDB2Connect.getDb2LoggedInCrns(); [/CODE] does it return an ArrayList that has correct values inside? I don't believe you should get an error. Can you post what that method does? getDb2LoggedInCrns Re: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer 13 Years Ago by ashwiniku hi, in getDb2LoggedInCrns() i took some user_ID from database by using query. Re: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer 13 Years Ago by javaAddict Can you post the signature of the getDb2LoggedInCrns method? Is it like something this? [CODE] public ArrayList<Integer> getDb2LoggedInCrns () { .. } [/CODE] or [CODE] public ArrayList getDb2LoggedInCrns () { .. } [/CODE] Re: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer 13 Years Ago by javaAddict [QUOTE=~s.o.s~;1280257]db2Crns.get(i) returns a String and you are trying to cast it to an Integer hence the error. Use Integer.parseInt for parsing an integer from a string.[/QUOTE] But 'db2Crns' is declared like this: [CODE] ArrayList<Integer> db2Crns=new ArrayList<Integer>(); [/CODE] Re: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer 13 Years Ago by ~s.o.s~ That still doesn't matter since the line [icode]db2Crns=testDB2Connect.getDb2LoggedInCrns();[/icode] would screw everything up if the method getDb2LoggedInCrns returns a raw list. [code]public class Tester { public static void main(final String[] args) { List<Integer> ints = new ArrayList<Integer>(); ints = getList(); …