Throw StackOverflowError from initMethodStack; add StackOverflowError class and native test

[shai-almog]

Motivation

• Prevent an assertion crash when the VM call stack is exhausted by throwing a proper StackOverflowError so Java code can catch and recover.
• Provide the missing java.lang.StackOverflowError class so the VM can instantiate and throw the error.
• Add an integration test to validate that a stack overflow is thrown and that the VM can continue execution after it is caught.

Description

• Added vm/JavaAPI/src/java/lang/StackOverflowError.java implementing java.lang.VirtualMachineError.
• Updated vm/ByteCodeTranslator/src/nativeMethods.m to include the StackOverflowError header and change initMethodStack to check callStackOffset and call throwException(threadStateData, __NEW_INSTANCE_java_lang_StackOverflowError(threadStateData)) and return instead of asserting.
• Added vm/tests/src/test/java/com/codename1/tools/translator/StackOverflowIntegrationTest.java, a native integration test that compiles a small app which triggers a stack overflow, verifies the StackOverflowError was thrown/caught (STACK_OVERFLOW_OK) and that normal execution (a recursive sum) still works after recovery (RECOVERY_OK:7).

Testing

• No automated tests were executed as part of this change.
• A new automated integration test StackOverflowIntegrationTest was added under vm/tests and will run as part of the VM test suite when the test goals are invoked.
• The change is limited to VM native code, the JavaAPI, and an integration test; CI or a local Maven test run should be used to validate the new test in the full environment.

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Codex Task

[github-actions]

✅ Continuous Quality Report

Test & Coverage

• ✅ Tests: 2283 total, 0 failed, 0 skipped
• 📊 Line coverage: 52.79% [HTML preview] [Download]
  • Lowest covered classes
    • com.codename1.io.rest.RequestBuilder$FetchAsPropertyListActionListener – 0.00%
    • com.codename1.io.rest.RequestBuilder$FetchAsPropertiesActionListener – 0.00%
    • com.codename1.ui.Display$EdtException – 0.00%
    • com.codename1.ui.BrowserWindow$BrowserForm – 0.00%
    • com.codename1.ui.plaf.CSSBorder$LinearGradient – 0.00%
    • com.codename1.io.rest.RequestBuilder$GetAsStringAsyncImplActionListener – 0.00%
    • com.codename1.io.rest.RequestBuilder$GetAsJsonMapActionListener – 0.00%
    • com.codename1.payment.Purchase$SynchronizeReceiptsSyncRunnable – 0.00%
    • com.codename1.io.rest.RequestBuilder$GetAsBytesAsyncImplActionListener – 0.00%
    • com.codename1.io.rest.RequestBuilder$FetchAsJsonMapActionListener – 0.00%

Static Analysis

• ✅ SpotBugs: 0 findings (no issues) [Report archive]
• ❌ PMD: 71 findings (P3: 63, P4: 8) [HTML preview] [Download]
  • Top findings
    • P3: CodenameOne/src/com/codename1/ads/InnerActive.java:43 – This final field could be made static (rule: FinalFieldCouldBeStatic)
    • P3: CodenameOne/src/com/codename1/annotations/Async.java:19 – Class cannot be instantiated and does not provide any static methods or fields (rule: MissingStaticMethodInNonInstantiatableClass)
    • P3: CodenameOne/src/com/codename1/charts/compat/PathMeasure.java:36 – Perhaps 'forceClosed' could be replaced by a local variable. (rule: SingularField)
    • P3: CodenameOne/src/com/codename1/components/Accordion.java:225 – Use opposite operator instead of the logic complement operator. (rule: LogicInversion)
    • P3: CodenameOne/src/com/codename1/facebook/FaceBookAccess.java:1323 – Unnecessary semicolon (rule: UnnecessarySemicolon)
    • …and 66 more
• ❌ Checkstyle: 220893 findings (Warning: 220893) [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 220888 more

Generated automatically by the PR CI workflow.

[shai-almog]

iOS screenshot updates

Compared 30 screenshots: 22 matched, 7 updated, 1 missing reference.

• BrowserComponent — updated screenshot. Screenshot differs (1206x2622 px, bit depth 8).

  
  Preview info: Preview provided by instrumentation.
  Full-resolution PNG saved as BrowserComponent.png in workflow artifacts.

• graphics-draw-arc — updated screenshot. Screenshot differs (1206x2622 px, bit depth 8).

  
  Preview info: JPEG preview quality 20; JPEG preview quality 20; downscaled to 603x1311.
  Full-resolution PNG saved as graphics-draw-arc.png in workflow artifacts.

• graphics-draw-gradient — updated screenshot. Screenshot differs (1206x2622 px, bit depth 8).

  
  Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 844x1835.
  Full-resolution PNG saved as graphics-draw-gradient.png in workflow artifacts.

• graphics-draw-round-rect — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-draw-round-rect.png.

  
  Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 844x1835.
  Full-resolution PNG saved as graphics-draw-round-rect.png in workflow artifacts.

• graphics-draw-string — updated screenshot. Screenshot differs (1206x2622 px, bit depth 8).

  
  Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 422x918.
  Full-resolution PNG saved as graphics-draw-string.png in workflow artifacts.

• graphics-draw-string-decorated — updated screenshot. Screenshot differs (1206x2622 px, bit depth 8).

  
  Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 603x1311.
  Full-resolution PNG saved as graphics-draw-string-decorated.png in workflow artifacts.

• graphics-fill-arc — updated screenshot. Screenshot differs (1206x2622 px, bit depth 8).

  
  Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 844x1835.
  Full-resolution PNG saved as graphics-fill-arc.png in workflow artifacts.

• kotlin — updated screenshot. Screenshot differs (1206x2622 px, bit depth 8).

  
  Preview info: Preview provided by instrumentation.
  Full-resolution PNG saved as kotlin.png in workflow artifacts.

Benchmark Results

• VM Translation Time: 316 seconds
• Compilation Time: 297 seconds

Detailed Performance Metrics

Metric	Duration
Build Time Statistics
Setup & Unzip	23437 ms
Extract Extensions	14 ms
Google Services Setup	3 ms
Scan Classes	753 ms
Extract Libs	508 ms
Inject Build Hints	29 ms
Generate Unit Tests	2 ms
Generate Stubs	780 ms
Compile Stubs	1741 ms
Generate Icons	778 ms
Prepare ParparVM	124 ms
ParparVM Execution	193864 ms
Post-VM Setup	388 ms
CocoaPods	5377 ms
Finalize	58 ms
Total Time	227857 msMaven Overhead : 89000 ms
CocoaPods Install (Script)	2000 ms
Simulator Boot	98000 ms
Simulator Boot (Run)	10000 ms
App Install	17000 ms
App Launch	14000 ms
Test Execution	206000 ms