I have java 8 installed on fedora 20. Any java program runs perfectly fine via eclipse but when I run the same program on terminal it reports an error saying 'could not load main class' . what could be the problem?

I wrote a simple helloworld program named hello.java and executed on eclipse. Then I opened terminal and moved to the folder containing the hello.class in eclipse workspace and typed ' java hello '. But it said 'error:could not load main class'.

Also as I said I have installed and I use oracle java 8.

  • Welcome to Unix.SE! You need to give a little more detail: what command are you typing to start your program? Please edit your question to add the info. – Stephen Kitt Jun 29 '15 at 7:57
  • Could you please paste the code of your Hello.java file? – binfalse Jun 29 '15 at 8:32

You need to open it with java -jar Hello

  • It did not work. – Aditya Gupta Jul 3 '15 at 17:43
  • What's the error? – nifker Jul 3 '15 at 17:44
  • Error: unable to access jarfile Hello – Aditya Gupta Jul 4 '15 at 15:29
  • Have you given the file execute permission? – nifker Jul 10 '15 at 0:03

in terminal type java -version and observe the version that appear.

say, it is v1

in eclipse Window->Preferences->Java compiler, check version

say it is v2

To work v2 must be <= v1, if eclipse has newer java version you need one of two:

1) install newer java on linux 2) downgrade java compiler in eclipse

  • Java version at both the places is 1.8 . – Aditya Gupta Jul 4 '15 at 15:27
  • Check that: stackoverflow.com/questions/18093928/… – Vladimir Nabokov Jul 4 '15 at 17:24
  • Yeah.... Found the solution. I had to use '-cp . ' option to include the current directory in class path. Surprisingly it java does not even look in the current working directory for .class files. I had to use ' java -cp . Hello' to run the class file. – Aditya Gupta Jul 26 '15 at 11:14

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