Duplicate Class Error Java
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All Mobile Java Java Android Developers Java iOS Developers News Features How-Tos Blogs Resources/White Papers Newsletters × Close Home Dustin's Software Development Cogitations and Speculations By Dustin Marx About | A software developer's public collection of tips and tricks, real-world solutions, and industry commentary related to Java programming. How-To Java: "duplicate class" and Mismatched File Name Error More like this Reproducing "code too large" Problem duplicate local variable error in java in Java Basic Java hashCode and equals Demonstrations Reproducing "too many constants" Problem in Java Email a friend To Use commas to separate multiple email addresses From Privacy Policy Thank you Your message has been sent. Sorry There was an error emailing this page. Comments JavaWorld | Feb 10, 2010 8:16 PM PT Comments Developers who are new to Java can sometimes have trouble with class and package naming. In fact, the introductory Java forums are filled with threads starting with questions about these areas of Java. In this blog post, I look at some of these errors and some of the causes of these errors.One of the more obvious errors occurs when a public Java class is named differently than the file that contains the class definition.This is demonstrated in the next screen snapshot. In this example, a class was declared as public with the name Person, but was saved in a file called Person2.java. The error message is pretty explicit: "class Person is public, should be declared in a file named Person.jav
class when there is no duplicate class Summary: Reporting duplicate class when there is no duplicate class Status: duplicate class error in ant build REOPENED Product: java Classification: Unclassified Component: Source Version: 7.3 Hardware: PC Windows duplicate class netbeans 7 x64 Priority: P3 (vote) TargetMilestone: 7.3 Assigned To: Svata Dedic QA Contact: issues@java URL: Whiteboard: Keywords: Depends on: error duplicate class maven Blocks: Show dependency tree /graph Reported: 2013-02-19 16:43 UTC by cmd1234 Modified: 2016-01-01 05:50 UTC (History) CC List: 1 user (show) MackSix See Also: Issue Type: DEFECT Exception Report http://www.javaworld.com/community/node/4042 : Attachments uplocateclass.png (102.43 KB, image/png) 2014-06-03 09:21 UTC, Zom-B Details View All Add an attachment (proposed patch, testcase, etc.) Note You need to log in before you can comment on or make changes to this bug. Description cmd1234 2013-02-19 16:43:26 UTC Its actually version 7.3 RC2 Get duplicate class error when there is no duplicate class. Program compiles up correctly https://netbeans.org/bugzilla/show_bug.cgi?id=226360 with no errors. Have deleted cache files, but problem persists. When loaded into Netbeans 7.2 I have no problems at all. Comment 1 cmd1234 2013-02-19 17:09:23 UTC Got around the problem I didn't know that netbeans has two places where is caches files. had deleted ~/Library/Application\ Support/NetBeans/7.3rc2 but also need to delete ~/Library/Caches/NetBeans/7.3rc2 so its just the old cache problem. Comment 2 Tomas Danek 2013-02-27 15:31:50 UTC closing then. Comment 3 psammalisto 2013-03-22 19:19:28 UTC I got that error when I copied a backup over the file in src folder. I could find the class name only in the class file and in project properties as main.class, it cannot be found e.g. anywhere in files in ~folder. Comment 4 Tomas Danek 2013-04-10 09:14:46 UTC Did you try wiping out the cache (like ~/Library/Caches/NetBeans/7.3 ) ? (In reply to comment #3) > I got that error when I copied a backup over the file in src folder. I could > find the class name only in the class file and in project properties as > main.class, it cannot be found e.g. anywhere in files in ~folder
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error LinkBack LinkBack URL About LinkBacks Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Search Thread Advanced Search Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 07-11-2011,08:40 AM #1 hamedy Member Join Date Jul 2011 Posts 3 Rep Power 0 Duplicate class error hi there, I'm a 1 day java programmer ! started with netbeans and right away faced a meaningless error: 1- created a new empty project, 2- added an empty java file to default package called GradeBook ! 3- put this in the file: public class GradeBook { public void displayMessage() { System.out.println("test"); } } and it gives the error "duplicate class: GradeBook" when I change the name to anything else it gets right ! please sb tell me what the hell is this :D Reply With Quote 07-11-2011,08:55 AM #2 Dark Senior Member Join Date Apr 2011 Location Camp Lejuene, North Carolina Posts 643 Rep Power 6 Hmm, normally its caused by having another file with the class in it within the same package. Do you have two GradeBook classes somewhere? Maybe in another file? If not I did some reading on it and it seems that some times Netbeans doesn't always properly rebuild itself or something to that effect. They suggest deleting all the unnecessary old files and trying it again. They also said to try using the "Clean and Build" option, now I don't know what that does because I don't use Netbeans I assume it filters out whatever isn't necessary for the program to run. However since you're just starting, I suggest using a less helpful IDE. IDE's are helpful, too helpful in fact for people starting. While there are exceptions, it often allows the user to be lazy and take shortcuts instead of actually learning why certain things act the way they do. I suggest using Notepad++. It has a bunch of IDE functionality, the useful stuff like auto-indenting and syntax highlighting, without giving you so much power that you can easily skip out on the things you are trying to learn. Using Notepad++ and the Command Prompt to handle your Java building will force you to get your hands dirty and learn more about the language. Use [code][/code] tags when posting code. That way people don't want to stab their eyes out when trying to help you.+Rep people for h