For a while now I’ve been using my own custom batch file to build my project, in addition to compiling the class files it also packages it into a jar, signs it, and uploads it to my development server (as it’s an applet for a site I’m working on). However, since there’s two computers I develop on I had to create two copies of this script that were customized to each of the PCs, as one was running Windows 7 and the other Windows XP. During one of the SVN commits or updates the default builder was completely nuked, it still showed up but gave errors when I tried to use it. I tried to recreate it inside of Eclipse but had no luck, so for a while I just worked around it, however it was frustrating when I simply wanted to launch the applet within Eclipse for a quick test.

Eventually I created a new project for something else and found the builder in it worked as expected, so I realized it was project specific. So I compared the .project files and was able to correct the corrupted one using the new one as a reference. Here is an example of how a .project file should look with just the default Java builder:

<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
	<name>HelloWorld</name>
	<comment></comment>
	<projects>
	</projects>
	<buildSpec>
		<buildCommand>
			<name>org.eclipse.jdt.core.javabuilder</name>
			<arguments>
			</arguments>
		</buildCommand>
	</buildSpec>
	<natures>
		<nature>org.eclipse.jdt.core.javanature</nature>
	</natures>
</projectDescription>

In the above example I have removed my custom builders to focus on the built in one, they would each be listed as extra buildCommand entries in the parent buildSpec node. In my corrupted copy I had several argument and trigger values that were unnecessary. Just for comparison, here is the buildCommand for my custom Windows 7 builder:

<buildCommand>
	<name>org.eclipse.ui.externaltools.ExternalToolBuilder</name>
	<triggers>full,incremental,</triggers>
	<arguments>
		<dictionary>
			<key>LaunchConfigHandle</key>
			<value>&lt;project&gt;/.externalToolBuilders/Win7_Builder.launch</value>
		</dictionary>
	</arguments>
</buildCommand>

Hope this helps someone else out there! And stay tuned, as I’ll be releasing my custom build script very soon for those who may be interested 😀

Brad Fettes

A seasoned Senior Solutions Architect with 18 years of experience in technology design and implementation. Renowned for innovative solutions and strategic insights, he excels in driving complex projects to success. Outside work, he is a passionate fisherman and fish keeper, specializing in planted tanks.