yegor256/cactoos

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Object-Oriented Java primitives, as an alternative to Google Guava and Apache Commons

Stars: 782
Forks: 176
Open beginner issues: 0
Indexed issues: 58
Avg merge: 14h 5m
Merged PRs (30d): 15

Dominant language: Java
License: MIT
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: help wanted

Beginner friendly Everything

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58 open issues indexed

pom.xml:397-415: In the continuation of #588, all the... Open

bug pdd

Difficulty 2/5 Under an hour Newbie friendliness 62/100

yegor256/cactoos#1910 · Opened Jul 22, 2026
REUSE.toml override sets copyright to single year 2025 for README/LICENSE/.txt/.json/.csv while source headers carry 2017-2026 Open

bug

yegor256/cactoos#1898 · 1 comment · 1 assignee · Opened Jun 13, 2026
Consistency of Java version Open

bug

yegor256/cactoos#1872 · 11 comments · 1 reaction · 1 assignee · Opened Apr 12, 2026
Let's implement a Immutable Map decorator Open

enhancement

yegor256/cactoos#1835 · 1 assignee · Opened Jan 6, 2026
Files.walk equivalent in Elegant style Open

enhancement help wanted

yegor256/cactoos#1817 · 1 comment · 1 assignee · Opened Oct 26, 2025
AppendToTest.java:71-72: Tests failed on Windows due to... Open

bug pdd

Difficulty 2/5 Under an hour Newbie friendliness 35/100

yegor256/cactoos#1714 · Opened Feb 21, 2024
Let's implement a Multiline Text Open

enhancement

yegor256/cactoos#1704 · 4 comments · 1 assignee · Opened Dec 9, 2023
Can we move `SlowInputStream.java` to production classes? Open

enhancement

yegor256/cactoos#1693 · 1 assignee · Opened Aug 30, 2023
Bad performance locking Open

enhancement

yegor256/cactoos#1688 · 5 comments · 1 assignee · Opened Aug 20, 2023
Example of iteration Open

bug

yegor256/cactoos#1670 · 4 comments · 1 assignee · Opened Dec 10, 2022
Dependency Dashboard Open

enhancement wontfix

Difficulty 1/5 Under an hour Newbie friendliness 20/100

yegor256/cactoos#1656 · Opened Sep 16, 2022
package-info.java:29-31: Create tests for the semantics... Open

bug pdd

yegor256/cactoos#1630 · 2 comments · 1 reaction · 1 assignee · Opened Oct 16, 2021
UncheckedBytes.java:37-40: Extract fallback logic for... Open

bug pdd

Difficulty 2/5 Under an hour Newbie friendliness 45/100

yegor256/cactoos#1623 · 3 comments · Opened Sep 5, 2021
Exchange constructor and method argument ForEachXXX classes Open

enhancement

yegor256/cactoos#1622 · 1 comment · 1 assignee · Opened Jul 18, 2021
Joined(Iterable<? extends T> items, T item) Open

enhancement

yegor256/cactoos#1619 · 7 comments · 1 assignee · Opened Jun 22, 2021
SumOfTest.java:37-41: Following the rewrite of the Number... Open

bug pdd

Difficulty 1/5 Under an hour Newbie friendliness 35/100

yegor256/cactoos#1617 · 3 comments · Opened Jun 12, 2021
package-info.java:29-31: Exploit generic variance for... Open

bug pdd

Difficulty 2/5 Under an hour Newbie friendliness 35/100

yegor256/cactoos#1614 · 5 comments · Opened May 13, 2021
package-info.java:29-31: Exploit generic variance for... Open

bug pdd

Difficulty 2/5 Under an hour Newbie friendliness 35/100

yegor256/cactoos#1613 · 5 comments · Opened May 13, 2021
MapEnvelope should delegate all its method Open

enhancement

yegor256/cactoos#1606 · 4 comments · 1 assignee · Opened May 7, 2021
CollectionEnvelope<T>, ListEnvelope<T>, etc. should support the Stream<T> in ctor Open

enhancement

yegor256/cactoos#1584 · 1 comment · 1 assignee · Opened Apr 14, 2021
package-info.java:29-33: We must find all the classes... Open

bug pdd

Difficulty 2/5 Under an hour Newbie friendliness 35/100

yegor256/cactoos#1577 · 3 comments · Opened Mar 22, 2021
package-info.java:29-31: Exploit generic variance for... Open

bug pdd

Difficulty 2/5 Under an hour Newbie friendliness 30/100

yegor256/cactoos#1571 · 3 comments · Opened Mar 14, 2021
package-info.java:29-31: Exploit generic variance for... Open

bug pdd

Difficulty 2/5 Under an hour Newbie friendliness 35/100

yegor256/cactoos#1570 · 9 comments · Opened Mar 14, 2021
package-info.java:29-31: Exploit generic variance for... Open

bug pdd

Difficulty 2/5 Under an hour Newbie friendliness 35/100

yegor256/cactoos#1564 · 12 comments · Opened Mar 14, 2021
package-info.java:29-31: Exploit generic variance for... Open

bug pdd waiting

Difficulty 2/5 Under an hour Newbie friendliness 25/100

yegor256/cactoos#1563 · 9 comments · Opened Mar 14, 2021
JoinedListIterator.java:39-42: We should implement... Open

bug pdd

Difficulty 2/5 Under an hour Newbie friendliness 45/100

yegor256/cactoos#1562 · 3 comments · Opened Mar 13, 2021
Joined.java:37-39: Make {@link Joined} implements... Open

bug pdd

Difficulty 1/5 Under an hour Newbie friendliness 35/100

yegor256/cactoos#1561 · 2 comments · Opened Mar 13, 2021
package-info.java:28-31: Continue replacing usage of... Open

bug pdd

Difficulty 1/5 Under an hour Newbie friendliness 42/100

yegor256/cactoos#1559 · 3 comments · Opened Mar 13, 2021
io.InputOfTest.readsSecureUrlContent test is consuming an external resource and it can cause CI issues Open

bug

yegor256/cactoos#1555 · 4 comments · 1 assignee · Opened Mar 6, 2021
Add ReducedWithDefault Open

enhancement

yegor256/cactoos#1512 · 1 comment · 1 assignee · Opened Dec 15, 2020
Scalar/Iterable conversion Open

enhancement

yegor256/cactoos#1506 · 6 comments · 1 assignee · Opened Nov 11, 2020
Put @Deprecated annotation on disabled methods Open

enhancement

yegor256/cactoos#1505 · 2 comments · 1 assignee · Opened Nov 10, 2020
Move some test classes to cactoos-matchers Open

enhancement

yegor256/cactoos#1503 · 1 assignee · Opened Nov 9, 2020
Replace `IterableOfDoubles`, `IterableOfInts`, etc with `IterableOfArray` Open

enhancement

yegor256/cactoos#1499 · 1 comment · 1 assignee · Opened Nov 6, 2020
Fix flaky test on Windows for scalar.Retry Open

bug

yegor256/cactoos#1497 · 4 comments · 1 assignee · Opened Nov 3, 2020
The intended use for collections.NoNulls is not clear from the javadoc Open

bug

yegor256/cactoos#1473 · 1 comment · 1 assignee · Opened Sep 27, 2020
No unit tests for scalar.NoNulls, text.NoNulls, bytes.NoNulls and iterable.NoNulls Open

enhancement

yegor256/cactoos#1469 · 4 comments · 1 assignee · Opened Sep 24, 2020
Code-Free Constructor Violations Open

enhancement

yegor256/cactoos#1468 · 25 comments · 1 assignee · Opened Sep 22, 2020
Use of ins't readable value 16 << 10 to describe length Open

enhancement

yegor256/cactoos#1442 · 4 comments · 1 assignee · Opened Sep 6, 2020
IterableOf, MapEntry and MapEnvelope should use HashCode instead of own hash code algorithm Open

enhancement

yegor256/cactoos#1440 · 7 comments · 1 assignee · Opened Sep 6, 2020
Create a Sleep class/object/decorator Open

enhancement

yegor256/cactoos#1439 · 6 comments · 1 assignee · Opened Sep 6, 2020
Printer for Text Open

enhancement

yegor256/cactoos#1424 · 3 comments · 1 assignee · Opened Jul 31, 2020
Randomized has an issue about its constructors parameters order Open

enhancement

yegor256/cactoos#1414 · 13 comments · 1 assignee · Opened Jul 5, 2020
Generic exceptions in Func, BiFunc, Proc, BiProc, Scalar, Input and Output Open

enhancement

yegor256/cactoos#1386 · 3 comments · 1 assignee · Opened May 10, 2020
Elegant way of creating files in subfolders Open

enhancement

yegor256/cactoos#1333 · 2 comments · 1 assignee · Opened Mar 25, 2020
Zipping directory is broken Open

bug

yegor256/cactoos#1283 · 12 comments · 1 assignee · Opened Feb 5, 2020
StickyBiFunc cache invalidation technique Open

enhancement

yegor256/cactoos#1260 · 4 comments · 1 assignee · Opened Dec 11, 2019
MultiMap implementation similar to Guava MultiMap implementations. Open

enhancement

yegor256/cactoos#1249 · 4 comments · 1 assignee · Opened Nov 26, 2019
Converting output stream to input stream doesn't work? Open

enhancement

yegor256/cactoos#1245 · 14 comments · 1 reaction · 1 assignee · Opened Nov 20, 2019
A new kind of Equals? Open

enhancement

yegor256/cactoos#1241 · 4 comments · 1 assignee · Opened Nov 16, 2019

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