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System.console() missing [message #1841238]

Fri, 07 May 2021 12:39

Andjelko Basic

Messages: 3
Registered: August 2016

Junior Member

Hello,
I am using Eclipse v. 2020-12 (4.18.0) on Ubuntu 20.04 to teach myself Java. It works fine except that System.console() returns null, meaning that no Console is available. When I ask Ubuntu whether Java is installed (terminal query: java -version), it says that it is not. Does this mean that Eclipse has its own Java which is not available outside of it? And do I have to install an Eclipse-independent Java, just so that Console can be made available to Eclipse.
Thanks.

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Re: System.console() missing [message #1841251 is a reply to message #1841238]

Fri, 07 May 2021 20:44

David M. Karr

Messages: 801
Registered: July 2009

Senior Member

Why are you calling "System.console()"? What do you need it for?

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Re: System.console() missing [message #1841317 is a reply to message #1841251]

Wed, 12 May 2021 06:02

Andjelko Basic

Messages: 3
Registered: August 2016

Junior Member

Just trying to learn different ways of I/O, as described in a text. Apparently console is one of them.

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Re: System.console() missing [message #1842111 is a reply to message #1841317]

Wed, 09 June 2021 13:11

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

Java has problems accessing the console, when it itself was not launched from a console (like it is the case when running programs within Eclipse). The core of this issue is within the system libraries, not Eclipse, but I vaguely recall some attempts to hack into the system libraries to work around that limitations. Not sure if any progress has been made.

TL;DR: if you want to learn about System.console() run your programs from a system console.

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