Fix version comparator: use numeric comparison instead of lexicographic string comparison (#166)#177
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…ic string comparison (apache#166) The version() comparator in ToolchainDiscoverer used String.compareTo() for version segment comparison, which produces incorrect ordering for versions with different digit counts (e.g. '8' was sorted before '11' and '17' because '8' > '1' lexicographically, and the reversed order incorrectly promoted JDK 8 over JDK 11/17). Fix by parsing each segment as an integer and using Integer.compare(). Also add unit test that verifies correct descending version sorting: 17 > 11 > 8.
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Added testVersionComparatorMultiPart test covering multi-part version strings (11.0.1, 11.0.31, 17.0.1, 1.8) |
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Bleah. opencode merged this without being instrcuted to do so. Yet another reason we should protect master. |
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Pull request overview
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Fixes incorrect JDK version ordering by switching ToolchainDiscoverer.version() from lexicographic to numeric segment comparison, and adds a unit test to prevent regressions (addresses #166).
Changes:
- Updated
ToolchainDiscoverer.version()to compare version segments numerically. - Added a helper
parseIntfor safe numeric parsing of version segments. - Added a JUnit test validating descending order for versions
17 > 11 > 8.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
| src/main/java/org/apache/maven/plugins/toolchain/jdk/ToolchainDiscoverer.java | Reworks version comparator to use numeric comparison and adds parsing helper. |
| src/test/java/org/apache/maven/plugins/toolchain/jdk/ToolchainDiscovererTest.java | Adds a regression test for correct numeric ordering of simple version strings. |
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| int oa = parseInt(a[i]); | ||
| int ob = parseInt(b[i]); | ||
| if (oa != ob) { | ||
| return Integer.compare(oa, ob); | ||
| } |
| private static int parseInt(String s) { | ||
| try { | ||
| return Integer.parseInt(s); | ||
| } catch (NumberFormatException e) { | ||
| return 0; | ||
| } | ||
| } |
| @Test | ||
| void testVersionComparator() { | ||
| ToolchainDiscoverer discoverer = new ToolchainDiscoverer(); | ||
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| ToolchainModel jdk8 = new ToolchainModel(); | ||
| jdk8.setType("jdk"); | ||
| jdk8.addProvide("version", "8"); | ||
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| ToolchainModel jdk11 = new ToolchainModel(); | ||
| jdk11.setType("jdk"); | ||
| jdk11.addProvide("version", "11"); | ||
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| ToolchainModel jdk17 = new ToolchainModel(); | ||
| jdk17.setType("jdk"); | ||
| jdk17.addProvide("version", "17"); | ||
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| List<ToolchainModel> list = new ArrayList<>(); | ||
| list.add(jdk8); | ||
| list.add(jdk17); | ||
| list.add(jdk11); | ||
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| list.sort(discoverer.version()); | ||
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| assertEquals("17", list.get(0).getProvides().getProperty("version")); | ||
| assertEquals("11", list.get(1).getProvides().getProperty("version")); | ||
| assertEquals("8", list.get(2).getProvides().getProperty("version")); | ||
| } |
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@elharo Please assign appropriate label to PR according to the type of change. |
Summary
Fixes #166
The
version()comparator inToolchainDiscovererusedString.compareTo()for version segment comparison, which produces incorrect ordering for versions with different digit counts. For example, "8" was sorted before "11" and "17" because '8' > '1' lexicographically, and the reversed order incorrectly promoted JDK 8 over JDK 11/17.Changes
String.compareTo()withInteger.parseInt()+Integer.compare()in theversion()comparator for proper numeric version segment comparisontestVersionComparator()test that verifies correct descending version ordering: 17 > 11 > 8Testing
testVersionComparator()that creates ToolchainModel objects with versions "8", "11", "17" and asserts descending sort orderexpected: <17> but was: <8>