Why does Java not compile my code?

Question

Language: Java
JRE: jre1.8.0_144
IDE: Eclipse Oxygen Release (4.7.0)

Description: After I hit the "run" botton, the code did not compile and red text appear in the console.

Screenshot:

Here is the code:

package chapter3.project2;
import java.util.*;

public class MetricConversion {

    public static void main(String[] args) {
        System.out.println("WTF Eclipse?");
    }
}

error message:

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
at chapter3.project2.MetricConversion.main(MetricConversion.java:30)

It seems that no matter what I put in the main method, the error just kept popping up.

Thank you.

Clean your project and rebuild. You must have disabled build automatically. Clearly that class doesn't have 30 lines. — Elliott Frisch, Sep 15 '17 at 00:00
try to do it with javac in cmd. And check if you have anything at line 30 in your MetricConversion.java — Sergei Sirik, Sep 15 '17 at 00:03
@SergeiSirik I DONT EVEN HAVE A LINE 30 OH GOD PLEASE HELP ME — BurgerBurglar, Sep 15 '17 at 00:16
man, try to create a new project. This is completely strange!! SOS — Abe, Sep 15 '17 at 00:18
What about `javac MetricConversion.java` in terminal? But anyway seems like Eclipse misbehaving, did you try to simply restart it? Clean *.class files from target directory? — Sergei Sirik, Sep 15 '17 at 00:19
I didn't disable it. Still not working... Screen shot: https://imgur.com/LIPp5VV — BurgerBurglar, Sep 15 '17 at 00:19
Have you tried cleaning and rebuilding your project (maybe after restarting your IDE or even computer)? — Pshemo, Sep 15 '17 at 00:22
@SergeiSirik javac: ?????: MetricConversion.java ??: javac -help ????????? — BurgerBurglar, Sep 15 '17 at 00:23
[javac](http://docs.oracle.com/javase/7/docs/technotes/tools/windows/javac.html) — Sergei Sirik, Sep 15 '17 at 00:28
I created a new Java Project and it somehow worked. I will definitely get a new IDE after a pass this class. Thanks guys... Don't know how to @ several users. — BurgerBurglar, Sep 15 '17 at 00:29
Did you even install the JDK? If so, did you make sure the IDE knows where it is? — Cardinal System, Sep 15 '17 at 01:25

score 0 · Answer 1 · answered Sep 15 '17 at 02:52

0

Where is jre library? Why not compile and run from source folder? Check project property and add jre runtime library also create source folder (src) and compile and run. Or Build a clean Java project and add packages and classes in src folder.

answered Sep 15 '17 at 02:52

Anil K

110
9

Why does Java not compile my code?

1 Answers1