eclipse doesn't compile the project

user_601357 0
Viewed 55430

I had running project opened in eclipse. After an accidental restart of windows, now when I open the eclipse I see my project is marked with a little red cross. Now when I run the main method I get a java.lang.NoClassDefFoundError.

I have tried restarting eclipse, Project -> Clean but it doesn't solve the problem.

When I checked the project directory, inside 'target' folder there are no compiled .class files. I tried building the project but I can't get the compiled class files, which is the reason for the error.

How do I solve this?

noclassdeffounderror build eclipse java
8 Answers

I tried all the solutions here, but here's what worked for me.

  1. First, remove the project from eclipse.

  2. Then, in your project folder, delete the 2 files that eclipse creates. They're hidden, but they're called .project and .classpath.

  3. Finally, add the project back into eclipse and eclipse will recreate those 2 files and a new configuration for your project.

My specific issue was that it a project that was missing a Java Builder because it thought it was a scala project. The only way for me to reset this was by removing the project, deleting the 2 files, and adding it back in.

user_10079220

Was having the same problem and finally found the glorious hint here. In my project there is one *.scala File and Eclipse Neon is incompatible with the Scala IDE, thus there is no builder for scala and the whole project is not built.

Project Properties -- > Builders

After removing the Scala file and the Scala Package from the linked Libraries )Project Properties --> Build Path --> Libraries) and afterward re-adding the Java Builder (no idea why this one went missing, but here's a useful help on how to add the Java builder when missing), the project could be built and run again.

user_90642870

For me the problem is in missing jars,the jars were added first and the location of those jars where changed after. So When I correctly added all the required jars again to the build path, it starts to build project correctly.

user_159135430
Related