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project build

ben oliver
Ranch Hand

Joined: Mar 28, 2006
Posts: 375
In Eclipse,

1. what's the difference between "build" and "clean build". Why doestimes a pj can be built OK using clean build but not with normal "build" ?

2. If I have a few projects (some are ejb, few are java projects). If I click "build" and can build each of them. What does that mean ? does it just mean it generates the .class file properly ? In order to really deploy the whole thing, do I still need to write separate ant script to bundle everything ? The basic question is --- By clicking "build" does not automatically create any .war ot .ear, correct ?

Jeanne Boyarsky
author & internet detective

Joined: May 26, 2003
Posts: 32819

Which IDE are you asking about? Eclipse, NetBeans, IntelliJ, etc?

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ben oliver
Ranch Hand

Joined: Mar 28, 2006
Posts: 375
I am using eclipse
Seetharaman Venkatasamy
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Joined: Jan 28, 2008
Posts: 5575

Build: generate .class file for your .java file .

Clean : it will remove all the .class file from particular folder

CleanBuild: it will remove all the .class file and then generate .class file for your source file(.java)[i dont see this option in eclipse. but i think it is in Netbean]
ben oliver
Ranch Hand

Joined: Mar 28, 2006
Posts: 375
sounds good. but if you choose to do "build", it also creates .class files and it should automatically replace the old .class, right ? so what's the difference of first removing all .class files ?
Peter Johnson

Joined: May 14, 2008
Posts: 5852

Build compiles only changed .java files. This could lead to problems if, for example, class A calls a method on class B, but you change the signature of that method - build then compiles only (assuming you had previously compiled boht and Now you have a broken app. (This is only one of several things that can go wrong.)

JBoss In Action
I agree. Here's the link:
subject: project build
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