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: 52.78% [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: 0 findings (no issues) [Report archive]
• ❌ Checkstyle: 112 findings (Error: 112) [HTML preview] [Download]
  • Top findings
    • Error: CodenameOne/src/com/codename1/javascript/JSFunction.java:1 – File does not end with a newline. (rule: NewlineAtEndOfFileCheck)
    • Error: CodenameOne/src/com/codename1/javascript/JSException.java:1 – File does not end with a newline. (rule: NewlineAtEndOfFileCheck)
    • Error: CodenameOne/src/com/codename1/annotations/Async.java:1 – File does not end with a newline. (rule: NewlineAtEndOfFileCheck)
    • Error: CodenameOne/src/com/codename1/io/tar/TarEntry.java:1 – File does not end with a newline. (rule: NewlineAtEndOfFileCheck)
    • Error: CodenameOne/src/com/codename1/io/tar/TarHeader.java:1 – File does not end with a newline. (rule: NewlineAtEndOfFileCheck)
    • …and 107 more

Generated automatically by the PR CI workflow.

[shai-almog]

iOS screenshot updates

Compared 29 screenshots: 22 matched, 2 updated, 1 missing reference, 4 errors.

• 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 — comparison error. Comparison error: PNG chunk truncated before CRC while processing: /Users/runner/work/_temp/cn1-ios-tests-Q9QcFU/graphics-draw-arc.png

  No preview available for this screenshot.
  Full-resolution PNG saved as graphics-draw-arc.png in workflow artifacts.

• graphics-draw-gradient — comparison error. Comparison error: PNG chunk truncated before CRC while processing: /Users/runner/work/_temp/cn1-ios-tests-Q9QcFU/graphics-draw-gradient.png

  No preview available for this screenshot.
  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 — comparison error. Comparison error: PNG chunk truncated before CRC while processing: /Users/runner/work/_temp/cn1-ios-tests-Q9QcFU/graphics-draw-string.png

  No preview available for this screenshot.
  Full-resolution PNG saved as graphics-draw-string.png in workflow artifacts.

• graphics-draw-string-decorated — comparison error. Comparison error: PNG chunk truncated before CRC while processing: /Users/runner/work/_temp/cn1-ios-tests-Q9QcFU/graphics-draw-string-decorated.png

  No preview available for this screenshot.
  Full-resolution PNG saved as graphics-draw-string-decorated.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: 420 seconds
• Compilation Time: 232 seconds

Detailed Performance Metrics

Metric	Duration
Build Time Statistics
Setup & Unzip	39348 ms
Extract Extensions	29 ms
Google Services Setup	2 ms
Scan Classes	1068 ms
Extract Libs	2054 ms
Inject Build Hints	69 ms
Generate Unit Tests	15 ms
Generate Stubs	1603 ms
Compile Stubs	2953 ms
Generate Icons	1495 ms
Prepare ParparVM	258 ms
ParparVM Execution	241096 ms
Post-VM Setup	192 ms
CocoaPods	8186 ms
Finalize	53 ms
Total Time	298423 msMaven Overhead : 122000 ms
CocoaPods Install (Script)	1000 ms
Simulator Boot	394000 ms
Simulator Boot (Run)	5000 ms
App Install	21000 ms
App Launch	11000 ms
Test Execution	253000 ms