Couldnt find the main class

Question

Well, i complile my program using this command in Ubuntu

javac -classpath .:/home/ss/lucene-4.0.0/core/lucene-core-4.0.0.jar:/home/ss/lucene-4.0.0/queryparser/lucene-queryparser-4.0.0.jar:/home/ss/lucene-4.0.0/analysis/common/lucene-analyzers-common-4.0.0.jar:/home/ss/lo.jar:/home/neetish/mysql-connector-java-5.1.25-bin.jar kel.java

It compiles.

And I run using

  java -classpath .:/home/ss/lucene-4.0.0/core/lucene-core-4.0.0.jar:/home/ss/lucene-4.0.0/queryparser/lucene-queryparser-4.0.0.jar:/home/ss/lucene-4.0.0/analysis/common/lucene-analyzers-common-4.0.0.jar:/home/ss/lo.jar:/home/ss/mysql-connector-java-5.1.25-bin.jar kel.java

and i Get

Could not find or load main class kel.java

can anyone help me plz

do `java -cp ... kel` also do you have `main()` in your class ? — Bhavik Shah, Jun 25 '13 at 08:47
@code: If your problem has been resolved, accept an answer and move on. — zEro, Jun 25 '13 at 09:20

score 4 · Answer 1 · edited Jun 25 '13 at 08:54

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Even though your source file's name kel.java, your class' name is just kel

You have to start your program with

java -cp ... kel

You should not add any suffix to the class name.

edited Jun 25 '13 at 08:54

zEro

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answered Jun 25 '13 at 08:45

Uwe Plonus

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Note that this only applies when *running* the program. When *compiling*, in contrast, it is necessary to include the .java extension. – T-Bull Jun 25 '13 at 09:00
@OP: Also make sure that the ``classpath`` is pointed to the directory where the compiled files are put. You might [find this useful](http://stackoverflow.com/questions/3005433/java-problem-could-not-find-main-class-helloworld?rq=1) – zEro Jun 25 '13 at 09:01
@T-Bull Comiling is done with `javac` and the original poster had no problem with compiling but with running, which is done by the command `java` as I wroe. – Uwe Plonus Jun 25 '13 at 09:01
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@UwePlonus: I know. Just pointed that out to already explain the next source of confusion. – T-Bull Jun 25 '13 at 09:06

score 0 · Answer 2 · answered Jun 25 '13 at 09:02

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After compilation, you can run by java kel. Simply remove the .class from you compiled file.

answered Jun 25 '13 at 09:02

Pyae Thu Aung

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score 0 · Answer 3 · answered Jun 25 '13 at 09:03

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After compilation, just give class name, instead kel.java. Just mention kel.

answered Jun 25 '13 at 09:03

user225716

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score 0 · Accepted Answer · answered Jun 25 '13 at 09:04

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If there is a main() method in kel.java and if it is successfully compile then

you can run it using following command.

java -classpath kel

in your case you are trying to run kel.java. That is wrong.

answered Jun 25 '13 at 09:04

Ruchira Gayan Ranaweera

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Couldnt find the main class

4 Answers4