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Unable to run Java class [message #1749347]

Mon, 05 December 2016 17:51

Sam Bh

Messages: 5
Registered: December 2016

Junior Member

Using Jdk8, Win7, eclipse Mars 4.5.0
I have a java class I am able to compile it, I can see the .class file in the /bin folder. But eclipse does not give me an option to run it. Confused

I can run all my other files fine. It is a stand alone java class, yes I do have the main method. Tried 'Clean', 'restarted' eclipse, tried to add it to 'organize favorties' - it does not show in the list. Surprised

What can I do?

Thanks
Sam

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Re: Unable to run Java class [message #1749433 is a reply to message #1749347]

Tue, 06 December 2016 17:10

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

From what you write it's hard to guess what goes wrong. Could be as simple as wrong modifier or signature of main(..), or you're tying a wrong gesture (menu, shortcut etc.) etc.

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Re: Unable to run Java class [message #1749434 is a reply to message #1749433]

Tue, 06 December 2016 17:26

Sam Bh

Messages: 5
Registered: December 2016

Junior Member

Problem was actually an compile issue- was hard for me to guess/see. I would not expect the .class file to get created if there is a compile error. I Kept deleting the .class- to ensure compile issues. But would get recreated again despite compile issue (not at all familiar with this behavior Shocked

).

However I finally got it compiled successfully by doing Maven project import etc. But still cant run. Have posted a separate question on this. Crying or Very Sad

[Updated on: Tue, 06 December 2016 17:35]

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Re: Unable to run Java class [message #1749436 is a reply to message #1749434]

Tue, 06 December 2016 17:49

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

Sam Bh wrote on Tue, 06 December 2016 18:26

Problem was actually an compile issue- was hard for me to guess/see. I would not expect the .class file to get created if there is a compile error. I Kept deleting the .class- to ensure compile issues. But would get recreated again despite compile issue (not at all familiar with this behavior ).

It's one of the differences between compilers, see, e.g., this answer on StackOverflow

Lesson learned: pay attention to compiler errors reported in the IDE Smile

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Re: Unable to run Java class [message #1749437 is a reply to message #1749436]

Tue, 06 December 2016 17:56

Sam Bh

Messages: 5
Registered: December 2016

Junior Member

Oh well- totally new to me(I am really out of touch), Rolling Eyes

My JAVA_HOME is my installed jdk8 - I would assume eclipse would use that. I will research this at some time.

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Re: Unable to run Java class [message #1749628 is a reply to message #1749437]

Thu, 08 December 2016 17:43

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

Sam Bh wrote on Tue, 06 December 2016 18:56

Oh well- totally new to me(I am really out of touch),
My JAVA_HOME is my installed jdk8 - I would assume eclipse would use that. I will research this at some time.

That only means that Eclipse runs on the JVM found in that installation. It doesn't mean that eclipse would be calling the compiler from it. In fact you can run Eclipse on a JRE, which doesn't even contain the javac compiler.

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