Eclipse won t compile run java file

Question

I am just trying to compile and run a simple java program  When I go to run my tester class it says select what to run and it gives me Ant Build which when highlighted says  Launches an Ant build with default settings  or Ant Build    that says  Launches an Ant build and allows it to be configured   When I try to select either of these it prompts  Build failed  Reason  Unable to find ant file to run  I honestly don t know what these ant builds and files are  This is definitely a dumb question but have no idea what to do

User · Answer

Your project has to have a builder set for it. If there is not one Eclipse will default to Ant. Which you can use you have to create an Ant build file, which you can Google how to do. It is rather involved though. This is not required to run locally in Eclipse though. If your class is run-able. It looks like yours is, but we can not see all of it.

If you look at your project build path do you have an output folder selected? If you check that folder have the compiled class files been put there? If not the something is not set in Eclpise for it to know to compile. You might check to see if auto build is set for your project.

User · Answer

Make a project to put the files in    File -  New -  Java Project Make note of where that project was created  where your  workspace  is   Move your java files into the src folder which is immediately inside the project s folder    Find the project INSIDE Eclipse s Package Explorer  Window -  Show View -  Package Explorer  Double-click on the project  then double-click on the  src  folder  and finally double-click on one of the java files inside the  src  folder  they should look familiar    Now you can run the files as expected    Note the hollow  J  in the image  That indicates that the file is not part of a project

User · Answer

This worked for me    Create a new project Create a class in it Add erroneous code  let error come Now go to your project  Go to Problems window Double click on a error    It starts showing compilation errors in the code

User · Answer

I was also in the same problem  check your build path in eclipse by Right Click on Project   build path   configure build path  Now check for Excluded Files  it should not have your file specified there by any means or by regex   Cheers

User · Answer

right click somewhere on the file or in project explorer and choose  run as -  java application

[java] Eclipse won't compile/run java file

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