Java: How do I run this eclipse-compiled program on the command line?

Question

I have a simple Hello World program that works properly when run from within Eclipse. What do I need to do to run this program from the command line?

~/g/private/eclipse/Hello/bin --> java Hello.class
Error: Could not find or load main class Hello.class

Here are the eclipse-generated files:

~/g/private/eclipse/Hello --> find . -type f
./.classpath
./.gitignore
./.project
./.settings/org.eclipse.jdt.core.prefs
./bin/Hello.class
./src/Hello.java

and the eclipse-generated .classpath:

~/g/private/eclipse/Hello --> cat .classpath
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
    <classpathentry kind="src" path="src"/>
    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
    <classpathentry kind="output" path="bin"/>
</classpath>

(note) I don't think this is a dupe of this question, as I'm explicitly asking about running a program compiled in eclipse. How to run Java program in command prompt

`javac Hello.java` for compiling Hello.java source code and `java Hello` to run Hello compiled code. — a3.14_Infinity, Oct 07 '15 at 05:42
It is stilll about running a java program from the command line... — JoSSte, Oct 07 '15 at 05:49

score 2 · Answer 1 · answered Oct 07 '15 at 05:43

java.exe or java expects a class name as its argument, not a file name

java -classpath C:\user\ Hello

So running java Hello.class will tell it to go looking for hello.class.class file.

or define classpath and use

java -cp C:\user\ Hello

PS : From Stackoverflow source

score 1 · Accepted Answer · edited Oct 18 '15 at 04:50

1

no need to give .class

~/g/private/eclipse/Hello/bin --> java Hello.class

just run like

~/g/private/eclipse/Hello/bin --> java Hello

or, specifying the class path:

~/g/private/eclipse/Hello java -cp bin Hello

edited Oct 18 '15 at 04:50

Mark Harrison

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answered Oct 07 '15 at 05:40

Juned Ahsan

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Super, that works. What if I want to run `java bin/Hello` ? – Mark Harrison Oct 07 '15 at 05:42
2

in that case tell java about your classpath and run like this : java -cp "path to bin dir" Hello – Juned Ahsan Oct 07 '15 at 05:43

Java: How do I run this eclipse-compiled program on the command line?

2 Answers2