Duplicate Class Error In Java
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ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack java duplicate class name Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up how to avoid “duplicate class” in Java up vote 8 down duplicate class java netbeans vote favorite 3 Suppose I have have a java project myProject and am using an external library jar (someJar.jar), which has a class com.somepackage.Class1.class. Now I find an updated version of Class1.java which fixes a bug in the original jar. I include the new Class1.java in my source code under package com.somepackage When I build the project (e.g., using Netbeans), there is a dist\myProject.jar which contains the classcom.somepackage.Class1.class
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and a dist\lib\someJar.jar which also contains a class with the same name. When I run the file (e.g, using java -jar dist\myProject.jar), the new version of Class1.class is used (as I want). How does Java decide which class file to run in case of such duplicates? Is there any way I can specify precedence ? Is there any 'right' way to avoid such clashes? In Proguard, when I try to compress my code, I get a duplicate class error. How do I eliminate this? java share|improve this question asked Jun 21 '11 at 16:50 Jus12 6,8341460110 add a comment| 3 Answers 3 active oldest votes up vote 4 down vote accepted Java decides which one to use based on the order of the classpath. List yours first and you'll be fine. The "right" way would be to fix the orignal source, but sometimes that's not always an option. I haven't used ProGuard, but I have re-jarred libaries before that had duplicate classes. The solution in my case was to tell Ant to ignore duplicate classes. I would assume ProGuard would have that support too. share|improve this answer answered Jun 21 '11 at 16:57 Reverend Gonzo 22.4k43769 add a comment| up vote 6 down vote
My Publications Wednesday, February 10, 2010 Java: "duplicate class" and Mismatched File Name Error Developers who are new to Java can sometimes have trouble with class and package naming. In duplicate class error in ant build fact, the introductory Java forums are filled with threads starting with duplicate class netbeans questions about these areas of Java. In this blog post, I look at some of these errors and
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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 http://stackoverflow.com/questions/6428992/how-to-avoid-duplicate-class-in-java 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.java"The "duplicate class" error can sometimes be a little more tricky to resolve. One http://marxsoftware.blogspot.com/2010/02/java-duplicate-class-and-mismatched.html situation in which this occurs is when two source code directories include the same class with the same package structure. This error looks like that shown in the next screen snapshot.As the above screen snapshot indicates, the class dustin.examples.Person exists in both the src2 directory and (not shown here) in the src directory ("duplicate class: dustin.examples.Person"). Indeed, these are duplicate classes, at least in terms of package and class name.The "duplicate class" error can also occur when the class is named the same with the same package naming hierarchy, even if one of the classes exists in a directory structure with directory names different than the package names. This is shown in the next screen snapshot.This screen snapshot demonstrates that the "duplicate error" occurs when the class names and declared package names match even if the source file exists in directories with different names (different even than the declared package structure). What this implies is that if a particular class was copied to another directory without changing the package statement and the new direc
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