How to watch java error output by pages?

Question

I have a program which throws StackOverflowException. So the error output is very big and I can't read beginning of output from terminal. How can I watch all program output?

I know that there is something like pagination in terminal. I've googled about it and found advice to use more or less commands.

So I've tried...

java Program | less

But it doesn't work. What am I doing wrong?

score 4 · Accepted Answer · answered Aug 10 '15 at 22:16

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Assuming you are using bash4 you can use the |& to concat std error.

java Program |& less

answered Aug 10 '15 at 22:16

Victory

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Thanks! Your answer helps a lot :) – solomkinmv Aug 10 '15 at 22:19
No problem! If this answers your question, up vote and mark correct :) – Victory Aug 10 '15 at 22:20
There is delay. I need to wait for few minutes before mark any answer. – solomkinmv Aug 10 '15 at 22:24
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FYI, this is probably the most portable solution if NOT using bash: http://stackoverflow.com/questions/7526971/how-to-redirect-both-stdout-and-stderr-to-a-file – Brian McFarland Aug 10 '15 at 23:09

accurate respondetur · Answer 2 · 2015-08-10T22:24:59.180

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You can redirect the output to a file

java myProgram &>file.log

Then you can tail , head or grep that file.

edited Aug 10 '15 at 22:24

answered Aug 10 '15 at 22:16

accurate respondetur

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I've tried this, but there is nothing in created file. It is empty. And I don't know why. – solomkinmv Aug 10 '15 at 22:22
I updated it adding the redirect of stderr to stdout – accurate respondetur Aug 10 '15 at 22:25
Now it works, thanks! But it is easier to use `&|` in such cases. – solomkinmv Aug 10 '15 at 22:29

score 0 · Answer 3 · answered Aug 10 '15 at 22:16

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Use a good IDE (Integrated Development Environment) such as Eclipse. Any decent IDE will have a debugger mode.

Java is a both compiled and interpreted language, which gives it speed and is also easy to debug.

IDE debuggers will walk you through the program execution step by step, which can help you to find errors in your program that you might not otherwise see.

answered Aug 10 '15 at 22:16

questioner and answerer

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Yeah, I know it. But sometimes it is faster to write small program in vim and then run it in terminal. – solomkinmv Aug 10 '15 at 22:20

How to watch java error output by pages?

3 Answers3