Can't compile/run in Eclipse- Java

Question

I'm trying to compile and run a simple program in Eclipse and whenever I hit run it says select what to run: and theres the option of two ant builds I have no clue what ant builds are or what to do about that.. when i try to run with the ant build it says "build failed: could not find an ant file to run" I have the newest version of java and everything should be working fine but when I can never get past the ant build problem.

Thanks for any advice!

Alt+Shift+X, then press J -- nothing happens at all.. I'm on a mac I don't know if that makes a difference — Jess Anastasio, Mar 02 '14 at 21:42
If someone get stuck with problem, please check this solution. It so differenent from another solutions and it helps me https://stackoverflow.com/a/47948092/7856586. — Roman Soviak, Feb 15 '18 at 21:50

score 5 · Answer 1 · answered Mar 02 '14 at 21:28

5

First make sure that you made a regular "Java Project", and not something else.

If there's something wrong with the build configuration, which i guess there is, go to: Run > Run Configurations... On the left you will see a list of configurations, make sure your configuration runs as a "Java Application". If not, delete all the configurations by selecting them and then press delete.

If things are fine, your program should run normally

answered Mar 02 '14 at 21:28

Hugo Kerstens

96
5

i originally created these java files on a different computer using dr java... they are .java files and should run.. i didn't create them in eclipse could that be an issue? – Jess Anastasio Mar 02 '14 at 21:43

score 0 · Answer 2 · answered Mar 02 '14 at 21:53

0

Create a Java Project by menu: File > New > Java Project
Only the Project name is mandatory (if needed, you can configure all other options later).
Browse to your new project, and select the src folder.
New > Package
New > Class
Make sure to select the checkbox to create: public static void main(...) This creates a runnable class.
Put some sample code to main(), e.g.:

System.out.println("HALLO");
Select the class in Package Explorer and Run As > Java Application

answered Mar 02 '14 at 21:53

Marco Roda

11
4

okay after following that way of doing it that worked. how can i get my existing java files that i created on dr. java ide to work on eclipse? – Jess Anastasio Mar 02 '14 at 22:20
You need to Import your sources to Eclipse project. – Marco Roda Mar 03 '14 at 07:46
Select the src folder and run: Import... > File System > Next, Browse to the location of your sources, make sure to select them. – Marco Roda Mar 03 '14 at 07:53

score 0 · Answer 3 · answered Mar 03 '14 at 02:39

Add buildCommand and nature tags in your .project file. You have to add Java Nature if you execute your project as Java project. Run As... menus are decided from the natures.

<projectDescription>
    ...
    <buildSpec>
        <buildCommand>
            <name>org.eclipse.jdt.core.javabuilder</name>
            <arguments>
            </arguments>
        </buildCommand>
    </buildSpec>
    <natures>
        <nature>org.eclipse.jdt.core.javanature</nature>
    </natures>
</projectDescription>

Can't compile/run in Eclipse- Java

3 Answers3