Add CLDC11 API compatibility GitHub Action

[shai-almog]

Summary

• add a GitHub Actions workflow to build CLDC11 and JavaAPI and run API subset validation against Java 11
• add a Python utility that compares the CLDC11 API surface against Java SE 11 and vm/JavaAPI, emitting extra API reports

Testing

• python -m py_compile scripts/cldc11_api_compat_check.py

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Codex Task

[github-actions]

✅ Continuous Quality Report

Test & Coverage

• ✅ Tests: 2280 total, 0 failed, 0 skipped
• 📊 Line coverage: 52.87% [HTML preview] [Download]
  • Lowest covered classes
    • com.codename1.ui.BrowserWindow$BrowserForm – 0.00%
    • com.codename1.processing.TextEvaluator – 3.85%
    • com.codename1.charts.views.PieChart – 4.00%
    • com.codename1.charts.views.PieMapper – 4.88%
    • com.codename1.charts.views.ScatterChart – 5.32%
    • com.codename1.ui.list.GenericListCellRenderer$Monitor – 5.33%
    • com.codename1.ui.Display$EdtException – 5.56%
    • com.codename1.testing.AbstractTest – 6.05%
    • com.codename1.ui.Transform$ImmutableTransform – 6.06%
    • com.codename1.charts.views.DoughnutChart – 6.25%

Static Analysis

• ❌ SpotBugs: 563 findings (High: 20, Normal: 334, Low: 209) [HTML preview] [Download]
  • Top findings
    • High: CodenameOne/src/com/codename1/charts/views/XYChart.java:128 – Call to equals() comparing different types (rule: EC_UNRELATED_TYPES)
    • High: CodenameOne/src/com/codename1/components/ImageViewer.java:310 – Condition has no effect (rule: UC_USELESS_CONDITION)
    • High: CodenameOne/src/com/codename1/io/NetworkManager.java:1064 – equals method always returns false (rule: EQ_ALWAYS_FALSE)
    • High: CodenameOne/src/com/codename1/io/gzip/InfBlocks.java:153 – Self assignment of field (rule: SA_FIELD_SELF_ASSIGNMENT)
    • High: CodenameOne/src/com/codename1/io/gzip/InfBlocks.java:154 – Self assignment of field (rule: SA_FIELD_SELF_ASSIGNMENT)
    • …and 558 more
• ❌ PMD: 2723 findings (P2: 1, P3: 634, P4: 2088) [HTML preview] [Download]
  • Top findings
    • P2: CodenameOne/src/com/codename1/ui/Display.java:1022 – Avoid using a branching statement as the last in a loop. (rule: AvoidBranchingStatementAsLastInLoop)
    • P3: CodenameOne/src/com/codename1/charts/views/LineChart.java:208 – These nested if statements could be combined (rule: CollapsibleIfStatements)
    • P3: CodenameOne/src/com/codename1/facebook/FacebookRESTService.java:76 – Avoid unused constructor parameters such as 'token'. (rule: UnusedFormalParameter)
    • P3: CodenameOne/src/com/codename1/impl/CodenameOneImplementation.java:8470 – These nested if statements could be combined (rule: CollapsibleIfStatements)
    • P3: CodenameOne/src/com/codename1/impl/FullScreenAdService.java:103 – These nested if statements could be combined (rule: CollapsibleIfStatements)
    • …and 2718 more
• ❌ Checkstyle: 220214 findings (Warning: 220214) [HTML preview] [Download]
  • Top findings
    • Warning: CodenameOne/src/com/codename1/db/ThreadSafeDatabase.java:30:1 – Extra separation in import group before 'java.io.IOException' (rule: CustomImportOrderCheck)
    • Warning: CodenameOne/src/com/codename1/db/ThreadSafeDatabase.java:32 – First sentence of Javadoc is missing an ending period. (rule: SummaryJavadocCheck)
    • Warning: CodenameOne/src/com/codename1/db/ThreadSafeDatabase.java:36 – Line is longer than 100 characters (found 143). (rule: LineLengthCheck)
    • Warning: CodenameOne/src/com/codename1/db/ThreadSafeDatabase.java:39:5 – 'member def modifier' has incorrect indentation level 4, expected level should be 2. (rule: IndentationCheck)
    • Warning: CodenameOne/src/com/codename1/db/ThreadSafeDatabase.java:40:5 – 'member def modifier' has incorrect indentation level 4, expected level should be 2. (rule: IndentationCheck)
    • …and 220209 more

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