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Ok here's the scene ........ i've gotta function which i need to call whose signature goes like this static boolean registerAdvertisementInstance(String rootType,[B]AdvertisementFactory.Instantiator instantiator[/B]) and is inside a class named AdvertisementFactory. now ive got a class called CodatAdv which has got a public static Inner class named Instantiator which implements the original AdvertisementFactory.Instantiator and has all the methods of that particular interface(AdvertisementFactory.Instantiator) ... |
// Misc /** * Returns a fixed-size list backed by the specified array. (Changes to * the returned list "write through" to the array.) This method acts * as bridge between array-based and collection-based APIs, in * combination with {@link Collection#toArray}. The returned list is * serializable and implements {@link RandomAccess}. * * This method also provides a convenient way to ... |
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hi, Remember one point, In compile time the compiler sees only the type of the referrence, not denoting the current object. But in runtime it sees denoting the current object, not the type of the referrence. If we try to typecast the reference, we change the type of the referrence, not denoting the current object, it only cheat the compiler, it ... |
It's because you're not instantiating a Dog class. You're instantiating an Animal class. If you tried in the other direction, it would work. Think about it: all animals are not necessarily dogs, but all dogs are animals. If you're line was Animal a = new Dog();, then you wouldn't have a problem. |
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it seems to me that worrying about optimization at this point is pre-mature. You would do better to concentrate on writing clean, clear and understandable code. THEN, if there are performance issues, worry about optimization. Even then, you need to use a profiler to determine where the slowdowns are. the odds are strongly against the slowdown being where you think it ... |
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The following code attempts to implement a Comparator, but I cannot see why it is throwing a ClassCastException at (third line from bottom) : String empName1 = emp1.getEmpName () ; java.lang.Integer Thank you. Exception in thread "main" java.lang.ClassCastException: java.lang.Integer cannot be cast to EmpClass at EmpNameComparator.compare(CompTest.java:53) at java.util.TreeMap.put(Unknown Source) at CompTest.main(CompTest.java:12) import java.util.* ; public class CompTest { public static void ... |
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This is my method in which i call hibernates through EJB and assign that list of database values from the HQL to a class called AssignmentByLetter where getters and setters are there for all the values which are coming from the database and residing in list. It is giving java.lang.ClassCastException.. Please help me out.. This is my code public List getAllAssignmentByLetter() ... |
This is my method in which i call hibernates through EJB and assign that list of database values from the HQL to a class called AssignmentByLetter where getters and setters are there for all the values which are coming from the database and residing in list. It is giving java.lang.ClassCastException.. Please help me out.. This is my code [code] public List ... |
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I did a google search for the exception to see what is wrong. I was astonished that this thread came as the first result. Google is fast . Now coming back to the question, in the code this statement is creating suspicion in my mind. Date date = (Date)df.parse(tempdate); Can you tell me what this tempdate is. Are you extracting it ... |
Hi Ranchers, Please find the below code.it is self explanatory but still wanted to ask why am i getting ClassCastException. For information -->Code is ran on JDK1.5 update 17 environment. package Interpretor; import java.util.MissingResourceException; import java.util.ResourceBundle; /* Empty Frequency class */ class Frequency{} /* An Enumeration of Pre-defined Notes */ enum Note{ SA, RE, GA, } /* NotesInterpretor class is used ... |
I'm trying to create a poker game for my CS project but I keep getting a java.lang.ClassCastException error and I don't know where it's coming from.... This is the game class, which I believe is where the error is coming from: import java.awt.*; import java.awt.event.*; import java.util.*; /***************************************************************** * Game of Poker. Player starts with 20 credits. There is a * ... |
Hi All, I am trying to store the string list in and object array but I am getting classCastException on it. Can anyone help me on that? I am using JDK1.5. Here is the code: List> statusResultList = new ArrayList>(); for (int b = 0; b < statusQueryResults.size(); b++) { Object[] statusRow = statusQueryResults.get(b); /** Some code */ } The statusResoultList ... |
Sorry to say, my friend, but you are mistaken; your example is not working fine. It will compile, yes, but at runtime, the line NewTest n = (NewTest)t1; //throws no exception absolutely will throw a ClassCastException. A cast can never actually change an object; it can only tell the compiler something that is true. So the first cast, from a NewTest ... |
Casting an object reference never changes the object in any way; it just tells the compiler "I know for a fact that the object being referred to is actually of some more specific type." If a cast is a lie -- as it is here! -- then you get an exception at runtime. To be a little more specific: the line ... |
Hello, I have an application, where I load jarfiles at runtime. I use URLClassloader to remember the loaded files, to be able to load the complete content of the jarfiles. All that works fine for most cases ... but now I get this strange error (see screenshot), with the trace: java.lang.ClassCastException: de.schwarzrot.dvd.theme.standard.StdTheme cannot be cast to de.schwarzrot.dvd.theme.standard.StdTheme at de.schwarzrot.dvd.theme.standard.StdSkinImage.refreshImage(StdSkinImage.java:68) at de.schwarzrot.dvd.theme.support.AbstractElementBase.getImage(AbstractElementBase.java:78) ... |
Hey everyone, I'm working on creating a symbol table for a parser I am writing and I am using a hashtable to implement my symbol table. I'm running into some trouble when I try to print out the values in my table. Here's what I'm doing: import java.util.Hashtable; import java.util.Enumeration; public abstract class SymbolTable { private Hashtable symTable; /** * ... |
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Ran into a tricky situation today. I have a Calender object in my class, which I serialized, and then deserialized back. This was in the codebase for a while, and was working fine. Although, of late, heard people complaining that they occasionally see a ClassCastException : java.util.SimpleTimeZone cannot be cast to sun...blahblahblah..ZoneInfo. We are running on Java1.6, though the dev environment ... |
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Obviously the actual contents of the List are instances of MyObject, not Long. That means that the cast to Long won't work. Just because you cast the Object to List doesn't turn every element into a Long. That's also why you got a compiler warning about this cast; the JVM cannot check at this time if the Object is really a ... |
Hi, I am writing a java application in which I call Matlab function via JMI (Java Matlab Interface). In Matlab, every variable is treated as an array. So, after the (custom made) function (involving complex image processing operations) in matlab is completed, it returns an array, say a, of length 2, in which a[0] is of type [Ljava.lang.String and a[1] is ... |
import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.List; public class ArrayUtils { public static void print(String[] arr) { System.out.println("array: " + Arrays.toString(arr) + " size: " + arr.length); } public static String[] reverse(String[] arr) { List list = Arrays.asList(arr); Collections.reverse(list); return (String[]) list.toArray(); } public static ArrayList toArrayList(String[] arr) { return (ArrayList) Arrays.asList(arr); } } |
I am getting the ClassCastException when I try to deserialize the Object. I tried to print the name of the class and it displays the same class. try { vIHData = (SymRegIHData) pInfoHabitant.getData(); } catch (Exception e) { e.printStackTrace(); System.out.println("**************8 " + pInfoHabitant.getData().getClass().getName()); System.out.println(pInfoHabitant.getData().toString()); } Error Trace: java.lang.ClassCastException: jeo.experiment.SymRegIHData cannot be cast to jeo.experiment.SymRegIHData at jeo.experiment.SymRegEvaluator.evaluate(SymRegEvaluator.java:178) at jeo.darwiners.DefaultAssessor.evaluate(DefaultAssessor.java:163) at jeo.darwiners.AbstractAssessor.assess(AbstractAssessor.java:85) at ... |
Greetings, For starters, I'll just explain the goal I'm trying to achieve. I want to implement a p13n (personalization) system in an application. Personalized classes would be sub-classes of those in the core packages. I want to create a custom ClassLoader that will first look in a p13n package for a personalized class, load it if present, or look in the ... |
My program has this run time error: Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.lang.String cannot be cast to mycom.lang.MyString at myproj.client.swing.util.MyStringUtil$MapComparable.compare(MyStringUtil.java:25) public MyComboBox(Map items) { super(MyStringUtil.sort(items).values().toArray()); Map itemsSorted = MyStringUtil.sort(items); keySet = itemsSorted.keySet(); init(); } public class MyStringUtil public static Map sort( Map map) { //... } } MyString is a third party class which I don't have the ... |
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You can't cast arrays like that. This looks like a situation where generics might help. Better still: don't use arrays but rather the more flexible ArrayList which is already "genericized". Edit: generics don't work well with arrays in that you can't create a generic array since type information doesn't exist at run time. You're far better off using an ArrayList here. ... |
Hi, I have problem with dynamically calling method. I have method myclass: public class myclass implements Serializable { private static final long serialVersionUID = -3756272735473013719L; public boolean isValid; public String ReturnCode; } this method I pack into separate jar file. I call function inside another jar file dynamically, which return myclass as parameter: public myclass validate(String _inputValue) { myclass cls = ... |
This a bit complicated, but I keep getting a ClassCastException at the return of my getItemAt Method (in bold and underlined). CourseList implements DiaryList just as Course implements DiaryItem. I need to return a Diaryitem so I am upcasting a declared Course object from my Courselist which is a node from my linked list. I want to know a) Why can't ... |
That can't be right. The stack trace is saying that line 83 is in the evaluatePostfix method. Maybe you need to delete your class files and recompile and try again. It wouldn't necessarily fix the problem, but if source and object code has gone out of whack, it'll be hard to trace the problem. |
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You can't downcast to a more specific class. You can only cast up to a more general class. Say you have an Animal class, and two subclasses, Mammal and Reptile. It makes sense that you could cast any Mammal as an Animal...but you clearly can't take any Animal and cast it to a Mammal...different subclasses will have different methods and fields, ... |
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english is a HashMap : eg, ABCD = 1, BCDE = 2, CDEF = 3 i want to retrieve the value of the string ABCD, but I get the exception at line 3 : java.lang.ClassCastException: java.lang.String Could someone kindly please point out my error, it's driving me mad. Edited by: CS_Student on Nov 17, 2007 3:34 PM |
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Darryl, I'm not sure why parser does what it does, but from what I see, in the OP's example it is not creating a Number instance, but a Long instance. That is what the error is telling me. It is OK to cast a Number to an Integer (I think) but not to cast a Long to an Integer. Again as ... |
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I was having trouble getting my pong game to display on the web even though it runs fine in jGrasp. Then I decided to test if it worked from a html on my computer in IE. It didn't. So I tried an even simpler program to see if it even worked in IE. It is reproduced below: import java.applet.Applet; import java.awt.*; ... |
Your browser is expecting to find an applet there. That's because you said "here is an applet", essentially, when you used the |
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Hello guys, Would any know why am getting this exception below. I get the exception when I try to log into the application. JBoss 4.0.5 GA EJB 2.0 J2SE 5.0 MySQL server 5.0.27 2007-03-05 17:53:09,866 ERROR [STDERR] java.lang.ClassCastException 2007-03-05 17:53:09,866 ERROR [STDERR] at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:229) 2007-03-05 17:53:09,867 ERROR [STDERR] at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137) 2007-03-05 17:53:09,867 ERROR [STDERR] at vsmequote.servlet.InternalServlet.doPost(InternalServlet.java:59) 2007-03-05 17:53:09,867 ERROR [STDERR] at ... |
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I'm using PdfBox 7.3 to convert PDFs to *.png images. This was working fine at home but at work crashes using the very same PDF files. In both machines I installed "JDK 6 Update 13" and am calling java.exe from the JDK's bin folder. It's the same setup in both places (I brought my "dist" folder to work which has the ... |
Hi, Thks for reply. I don't think the problem lies with the programs. I think it is due to some settings. I read from the internet that somebody mentioned that java version mismatch could also cause ClassCastException. I was using jdk1.6 initially but change to jdk1.5 but still experience the problem. Any idea? |
if(eventName.equals("Convert")&¤cyNames.equals("Pound Sterling ()")&¤cyNames2.equals("US Dollars ($)")) { String p1 = position1.getText(); conPosition = (Double.parseDouble(p1)*2); convert.setText(Double.toString(conPosition)); } if(currencyNames=="Pound Sterling ()" && currencyNames2=="Nigerian Naira ()") { String p1 = position1.getText(); conPosition = (Double.parseDouble(p1)*3); convert.setText(Double.toString(conPosition)); } if(currencyNames=="US Dollars ($)" && currencyNames2=="Pound Sterling ()") { String p1 = position1.getText(); conPosition = (Double.parseDouble(p1)*0.5); convert.setText(Double.toString(conPosition)); } } what am i doing wrong? should i create a seperate action ... |
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java.lang.ClassCastException: java.lang.String at sun.jdbc.rowset.CachedRowSet.getBytes(CachedRowSet.java:1778) at com.haydenr.lib02.crs2html.HrHtmlFldData.getData(HrHtmlFldData.java:102) at com.haydenr.lib02.crs2html.HrHtmlFldDataColumn.toHtmlData(HrHtmlFldDataColumn.java:28) at com.haydenr.lib02.crs2html.HrHtmlFldData.toHtml(HrHtmlFldData.java:393) at com.haydenr.lib02.crs2html.HrHtmlCellDataInputTextArea.toHtml(HrHtmlCellDataInputTextArea.java:61) at com.haydenr.lib02.crs2html.HrGrid.toHtmlCellData(HrGrid.java:488) at com.haydenr.lib02.crs2html.HrGrid.toHtmlCellDataDiv(HrGrid.java:399) at com.lalpac.web.Helper_Base.getHtmlCellDataDiv(Helper_Base.java:334) at com.lalpac.web.Helper_Base.getHtmlCellDataDiv(Helper_Base.java:324) at com.lalpac.web.HelperWizApp.getHtmlDataAfiEditDiv(HelperWizApp.java:2055) at org.apache.jsp.protected_.wca.wizAppFormLicensingObjectives_jsp._jspService(wizAppFormLicensingObjectives_jsp.java:88) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) 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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:535) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:472) at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968) at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:609) at org.apache.jsp.protected_.wca.wizAppForm_jsp._jspService(wizAppForm_jsp.java:406) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337) at ... |
I am havin a bean class. I am serializing the bean class. After serializing i convert the ByteArrayOutputStream object to string. Encode it. For De serialization i decode the the string then Make a ByteAraayInputStream object and construct the object again.. //Serialization ByteArrayOutputStream bos = new ByteArrayOutputStream(); ObjectOutputStream out = new ObjectOutputStream(bos); out.writeObject(objQuestionAnswerBean); out.flush(); String strQuestion = bos.toString(); String encd = ... |
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Hi all I have a problem and can't understand why. When I run my code sometimes I get ClasscCastException like this; Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException at javax.swing.LayoutComparator.compare(LayoutComparator.java:72) at java.util.Arrays.mergeSort(Arrays.java:1270) at java.util.Arrays.mergeSort(Arrays.java:1282) at java.util.Arrays.sort(Arrays.java:1210) at java.util.Collections.sort(Collections.java:159) at javax.swing.SortingFocusTraversalPolicy.enumerateAndSortCycle(SortingFocusTraversalPolicy.java:119) at javax.swing.SortingFocusTraversalPolicy.getFirstComponent(SortingFocusTraversalPolicy.java:434) at javax.swing.LayoutFocusTraversalPolicy.getFirstComponent(LayoutFocusTraversalPolicy.java:148) at javax.swing.SortingFocusTraversalPolicy.getDefaultComponent(SortingFocusTraversalPolicy.java:511) at java.awt.FocusTraversalPolicy.getInitialComponent(FocusTraversalPolicy.java:152) at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:340) at java.awt.Component.dispatchEventImpl(Component.java:4455) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Window.dispatchEventImpl(Window.java:2475) at java.awt.Component.dispatchEvent(Component.java:4413) at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) at java.awt.SequencedEvent.dispatch(SequencedEvent.java:101) at ... |
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One more thing to think about is the declaration of the list itself you have List list which means you will only store objects of type Field which you then want to cast to a subclass of Field, it is more appropriate to write List list this will avoid the below situation which is not legal, failing at 2 ... |
Well. I know sweet bugger all really about JSP (and by the way this question should have been posted in the JSP/Servlet forum) but I can't help but read your description and notice that you have bean thingy with an id of "storeOrderId" that has an "application" level scope that on one page is one class and another page is another ... |
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/* forward name="success" path="" */ private final static String SUCCESS = "success"; private final static String FAIL = "fail"; /** * This is the action called from the Struts framework. * @param mapping The ActionMapping used to select this instance. * @param form The optional ActionForm bean for this request. * @param request The HTTP Request we are processing. * @param ... |
instead of checking for instanseof DRingProtocol, if you check it for EDProtocol then it might solve your problem because ultimately you are casting it to EDProtocol. For this implementation you don't need to apply casting. But make sure that return type of getProtocol is either EDProtocol or subclass or its superclass. Edited by: opsharma on Oct 6, 2008 5:37 AM |
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Yes, what you have is the parent of the actual class failing which is the implementation (ie executing) class. The parent of the actual class (org.w3c.dom.Document) which is failing is org.w3c.dom.Node. After looking through the source of Document and Node I could find no reference to the Xerces apis. You need the xerces libraries in your classpath since that is what ... |
Hello Frnds, If i have a class variable in Class A and initialize with some value. But i want to use this value of the class variable in Class B. But it should not be a static variable. Class A - can have many instances. So Class B also have the same no of instances. so each copy of that particular ... |
here is the whole output deps-jar: Compiling 2 source files to C:\Documents and Settings\Bharat Raj Verma\My Documents\NetBeansProjects\bankpr\build\classes compile: run: USer id to search tmp tmp acc num found tmp name bharat verma connection Established java.lang.ClassCastException BUILD SUCCESSFUL (total time: 11 seconds) Iam using java netbeans v6.1 (if that makes a difference) and sorry for not using code tag as this is ... |
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I would suppose one of the following must be true 1. It sends strings only. Up to you to do something with it. 2. It sends serializable objects only. 3. You need to implement an interface to support what it does. Given that you are not getting a serialization exception I would guess that 2 is not possible. Other than that ... |
Here is your problem: fout = new FileOutputStream(file); out = new ObjectOutputStream(fout); out.writeObject(p1.age); You are attempting to save not the Object, but a primitive (int) which is an attribute of the Person Object. This will not work. What you need to do is save the Serializable Object, Person itself. Then you can access the Person Object through the ObjectInputStream. int is ... |
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This happens like 75% of the time! What is going on?? java.lang.ClassCastException: java.awt.image.ComponentColorModel cannot be cast to java.awt.image.DirectColorModel at sun.awt.image.WritableRasterNative.createNativeRaster(Unknown Source) at sun.java2d.windows.Win32OffScreenSurfaceData.getRaster(Unknown Source) at sun.java2d.loops.OpaqueCopyAnyToArgb.Blit(Unknown Source) at sun.java2d.loops.GraphicsPrimitive.convertFrom(Unknown Source) at sun.java2d.loops.GraphicsPrimitive.convertFrom(Unknown Source) at sun.java2d.loops.MaskBlit$General.MaskBlit(Unknown Source) at sun.java2d.loops.Blit$GeneralMaskBlit.Blit(Unknown Source) at sun.java2d.pipe.DrawImage.blitSurfaceData(Unknown Source) at sun.java2d.pipe.DrawImage.renderImageCopy(Unknown Source) at sun.java2d.pipe.DrawImage.copyImage(Unknown Source) at sun.java2d.pipe.DrawImage.copyImage(Unknown Source) at sun.java2d.SunGraphics2D.drawImage(Unknown Source) at sun.java2d.SunGraphics2D.drawImage(Unknown Source) at client.lobby.LoginEffects.paintComponent(LoginEffects.java:96) at javax.swing.JComponent.paint(Unknown ... |
When I run the program and enter "false false ||" I get the slightly more useful error message: Exception in thread "main" java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean at KimbelPostfix.main(KimbelPostfix.java:38) Now line 38 is the one in the else part of the while loop, that says: operand2 = ((Boolean)operandStack.pop()).booleanValue(); Evidently what you were casting to a Boolean - operandStack.pop() - ... |
It seems to me that you can't specialize from Dispatch. In other words, a Dispatch may not be able to do everything that a Requirement is able to - you got your inheritance mixed up here... Or if I'm wrong on that, try wrapping the Dispatch.call(... in parantheses Edited by: Brynjar on Dec 8, 2007 12:17 PM Edited by: Brynjar on ... |
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Hello all, I will try to describe the problem as clear as possible. In older Java versions it was possible to make a downcast to a more specificated class without getting an error, inheretance between the two objects was enough. For example : C inherits B inherits A In my existing code (old code), there is an object 'foobar' transmitted of ... |
/** * @throws SQLException */ private void retrieveTrustCompany() throws SQLException { DataSet ds = new DataSet(getDatabase()); StringBuffer sb = new StringBuffer(); sb.append("SELECT con_join_contact_id2"); sb.append(" FROM contact_join "); sb.append(" WHERE con_join_contact_id1 = ").append(getId()); sb.append(" AND TRUNC(con_join_date_start) < SYSDATE"); sb.append(" AND ( con_join_date_finish IS NULL OR con_join_date_finish > SYSDATE )"); sb.append(" AND con_join_assoc_id1 = ( SELECT assoc_id FROM association WHERE assoc_comp_id = 0 ... |
Hi all, I am using struts for my application and postgresql as back end.When i click one link it is showing error page. The page has to get datas from database.Iam sure the problem is not with the code.Since it is working fine in my friend system.for me it is showig the error as /////////////////////////////////////////////////////////////////////////// HTTP Status 500 - type Exception ... |
Hi all, Iam using struts framework in my project.The code was working fine.For the past two days, when i click one link the next page is showing error.Iam sure the problem is not with code since i have send my war to my friend system and i checked in his machine.It was working fine in his machine.And both were accessing same ... |
You are getting the same error because you are doing the same thing. First you put a String array into the map, then you take it out again and try to cast it to a String. That didn't work the first time, and the second time you still did it and it still didn't work. Although you surrounded it with some ... |
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I have a typical problem...I have a method which accepts Object as a parameter and I would like to convert that into an object of class (SoapRequestDS). Calling tostring on the argument correctly shows that the object is of type SoapRequestDS. But when I try to cast it to SoapRequestDS, it throws up ClassCastException. The SoapRequestDS class is user defined class. ... |