cbeust/jcommander

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Command line parsing framework for Java

Stars: 2k
Forks: 342
Open beginner issues: 1
Indexed issues: 94
Avg merge: 4h 10m
Merged PRs (30d): 4

Dominant language: Java
License: Apache-2.0
Last GitHub push: Sep 19, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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93 open issues indexed

arity should support with list parameter to support multiple occurence of the param Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

cbeust/jcommander#606 · Opened Oct 23, 2025
Please add support for option grouping Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

cbeust/jcommander#605 · Opened Sep 24, 2025
@ParametersDelegate fails if delegate class implements BiPredicate Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

cbeust/jcommander#582 · 2 comments · Opened May 13, 2024
An IParametersValidator on an ParametersDelegate should not be lifted to the top-level object Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

cbeust/jcommander#575 · 2 comments · Opened Jan 3, 2024
Does Jcommander support parse args into multiple sub command Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

cbeust/jcommander#570 · 4 comments · Opened Oct 24, 2023
[Bug] unexpected throw ParameterException("Password parameter must have at most 1 argument.") Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

cbeust/jcommander#568 · 6 comments · 1 reaction · Opened Oct 11, 2023
Support for Java Records Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

cbeust/jcommander#560 · 1 comment · Opened Jun 18, 2023
Main parameter conversion has priority over arity validation Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

cbeust/jcommander#546 · 1 comment · Opened Nov 2, 2022
Why is there `module-info.java`? Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

cbeust/jcommander#544 · 1 comment · 1 reaction · Opened Sep 7, 2022
Changelog missing updates Open

Difficulty 3/5 1-2 days Newbie friendliness 30/100

cbeust/jcommander#531 · 4 comments · Opened Jan 19, 2022
Repetition of same Boolean argument with arity `0` negates argument's value Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

cbeust/jcommander#530 · 2 comments · 1 reaction · Opened Dec 13, 2021
Jcommander support Enum Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

cbeust/jcommander#526 · 1 comment · Opened Oct 7, 2021
Combining required=true with defaults Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

cbeust/jcommander#517 · 1 comment · 1 reaction · Opened May 12, 2021
Multiple Default Providers Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

cbeust/jcommander#516 · 2 comments · Opened May 12, 2021
Support for default command Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

cbeust/jcommander#513 · 1 comment · Opened Mar 23, 2021
cannot detected the required parameter if no value input Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

cbeust/jcommander#508 · Opened Nov 26, 2020
Have a default validator Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

cbeust/jcommander#507 · 1 comment · Opened Oct 29, 2020
[BUG] FuzzyMap.IKey is package private Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

cbeust/jcommander#505 · 4 comments · Opened Oct 18, 2020
Missing OSGi headers in MANIFEST.MF Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

cbeust/jcommander#502 · Opened Oct 7, 2020
Cannot use in Scala the validation feature Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

cbeust/jcommander#500 · 1 comment · Opened Sep 2, 2020
Maven Central Updates Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

cbeust/jcommander#499 · 6 comments · 6 reactions · Opened Sep 1, 2020
Add possibility for list -> object Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

cbeust/jcommander#498 · 1 reaction · Opened Aug 7, 2020
Javadocs link broken Open

Difficulty 1/5 Under an hour Newbie friendliness 55/100

cbeust/jcommander#494 · Opened Jun 30, 2020
IStringConverter must NOT be Inner Class Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

cbeust/jcommander#489 · 1 comment · Opened Jun 5, 2020
JCommander#addCommand does not copy the custom `IUsageFormatter` Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

cbeust/jcommander#487 · Opened Jun 1, 2020
@SubParameter Problems Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

cbeust/jcommander#486 · 1 comment · Opened May 31, 2020
How can I get varying level of verbosity { -v -vv -vvv} functionality? Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

cbeust/jcommander#484 · 1 comment · Opened Apr 18, 2020
Updating from 1.7.2 to 1.7.8 breaks Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

cbeust/jcommander#483 · Opened Jan 9, 2020
Custom enum formatter for help. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

cbeust/jcommander#482 · Opened Jan 5, 2020
JCommander must support properties or rc files. Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

cbeust/jcommander#479 · 1 comment · Opened Nov 9, 2019
https://jcommander.org/ gives an SSL error Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

cbeust/jcommander#474 · 1 comment · 3 reactions · Opened Aug 22, 2019
SubCommands Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

cbeust/jcommander#472 · 7 comments · Opened Jul 3, 2019
Invoke IDefaultProvider only if needed Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

cbeust/jcommander#470 · Opened Jun 14, 2019
Usage for unnamed parameter Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

cbeust/jcommander#468 · Opened Mar 7, 2019
JCommander.setDescription() on tool level Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

cbeust/jcommander#467 · Opened Mar 7, 2019
Collection parameter handling 'forgets' items if a bean manages its own collection Open

Difficulty 2/5 1-3 hours Newbie friendliness 50/100

cbeust/jcommander#464 · Opened Feb 18, 2019
AnnotationTypeMismatchException in jcommander Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

cbeust/jcommander#463 · 1 comment · Opened Feb 5, 2019
About the @ syntax Open

Difficulty 2/5 1-3 hours Newbie friendliness 30/100

cbeust/jcommander#462 · 2 comments · Opened Jan 1, 2019
Can't handle main argument that is a String as stated in the documentation Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

cbeust/jcommander#461 · 1 comment · Opened Dec 7, 2018
Prompt for password is shown even when --help is used Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

cbeust/jcommander#460 · 2 comments · 1 reaction · Opened Nov 28, 2018
IDefaultProvider for lists duplicates defaults for each name Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

cbeust/jcommander#457 · Opened Sep 28, 2018
More than one space between parameters Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

cbeust/jcommander#455 · Opened Sep 13, 2018
Website offline? Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

cbeust/jcommander#453 · 1 comment · Opened Aug 26, 2018
Add option for not allowing password to be entered on command line Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

cbeust/jcommander#452 · Opened Aug 24, 2018
JPMS support Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

cbeust/jcommander#451 · 17 comments · 6 reactions · Opened Jul 30, 2018
Localization of error message Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

cbeust/jcommander#449 · 1 comment · 1 reaction · Opened Jun 5, 2018
Regex validator Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

cbeust/jcommander#448 · Opened May 28, 2018
Regression: NPE when using a Boolean field that has not been initialised Open

Difficulty 2/5 1-3 hours Newbie friendliness 38/100

cbeust/jcommander#447 · 3 comments · 1 reaction · Opened May 24, 2018
Doubling "Commands" when calling "Usage" if values of "commandNames" > 1 Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

cbeust/jcommander#446 · 1 reaction · Opened May 19, 2018
Subcommands Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

cbeust/jcommander#445 · 1 comment · 4 reactions · Opened May 7, 2018

cbeust/jcommander

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