Add java.util.logging core APIs

[dlunch]

Summary

• add the CLDC 8 logging core with common Java 1.4 Logger APIs
• support logger hierarchy, levels, filters, handlers, stream formatting, and reset behavior
• register the package and cover API behavior with java_runtime tests

Verification

• cargo test -p java_runtime --no-fail-fast -q
• cargo fmt --all -- --check
• cargo clippy -p java_runtime --all-targets -- -D warnings

[codecov]

Codecov Report

❌ Patch coverage is 68.88712% with 780 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.61%. Comparing base (5fbb27b) to head (5359f5e).

Files with missing lines	Patch %	Lines
...va_runtime/src/classes/java/util/logging/logger.rs	48.90%	561 Missing ⚠️
...me/src/classes/java/util/logging/stream_handler.rs	73.07%	77 Missing ⚠️
...untime/src/classes/java/util/logging/log_record.rs	81.38%	43 Missing ⚠️
...ava_runtime/src/classes/java/util/logging/level.rs	86.72%	32 Missing ⚠️
...a_runtime/src/classes/java/util/logging/handler.rs	80.43%	27 Missing ⚠️
...e/src/classes/java/util/logging/console_handler.rs	70.45%	13 Missing ⚠️
...ntime/src/classes/java/util/logging/log_manager.rs	94.82%	13 Missing ⚠️
...runtime/src/classes/java/util/logging/formatter.rs	93.96%	7 Missing ⚠️
.../src/classes/java/util/logging/simple_formatter.rs	91.02%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #198      +/-   ##
==========================================
- Coverage   87.74%   86.61%   -1.14%     
==========================================
  Files         298      308      +10     
  Lines       39025    41532    +2507     
==========================================
+ Hits        34244    35972    +1728     
- Misses       4781     5560     +779     

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[Copilot]

Pull request overview

This PR adds a Rust-backed implementation of core java.util.logging APIs to the java_runtime crate (CLDC 8 / Java 1.4-style surface), wires the new runtime classes into the class loader, and introduces JVM-level tests validating key behaviors like hierarchy, filtering, formatting, and reset semantics.

Changes:

• Implement java.util.logging runtime classes (Logger, LogManager, Level, LogRecord, Handler/StreamHandler/ConsoleHandler, Formatter/SimpleFormatter, Filter).
• Register the new logging classes in java_runtime’s runtime class loader and expose the module under java::util.
• Add java_runtime tests covering registration and major API behaviors (levels, records, handlers, logger propagation, reset).

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
java_runtime/src/classes/java/util.rs	Exposes the new util::logging module from the Java runtime.
java_runtime/src/classes/java/util/logging.rs	Declares and re-exports the java.util.logging runtime types.
java_runtime/src/classes/java/util/logging/console_handler.rs	Implements ConsoleHandler backed by System.err via StreamHandler.
java_runtime/src/classes/java/util/logging/filter.rs	Adds the Filter interface definition.
java_runtime/src/classes/java/util/logging/formatter.rs	Adds base Formatter including formatMessage parameter substitution support.
java_runtime/src/classes/java/util/logging/handler.rs	Implements Handler base behavior (level/filter/encoding/formatter management).
java_runtime/src/classes/java/util/logging/level.rs	Implements Level constants and parsing behavior.
java_runtime/src/classes/java/util/logging/log_manager.rs	Implements LogManager singleton, logger registry, hierarchy re-parenting, and reset.
java_runtime/src/classes/java/util/logging/log_record.rs	Implements LogRecord storage, metadata initialization, and sequence allocation.
java_runtime/src/classes/java/util/logging/logger.rs	Implements Logger creation, hierarchy, handlers, filtering, and convenience logging methods.
java_runtime/src/classes/java/util/logging/simple_formatter.rs	Implements SimpleFormatter formatting for LogRecord.
java_runtime/src/classes/java/util/logging/stream_handler.rs	Implements StreamHandler writing formatted records to an OutputStream.
java_runtime/src/loader.rs	Registers java/util/logging/* runtime class protos so they can be loaded.
java_runtime/tests/classes/java/util/mod.rs	Hooks java.util.logging test module into the java.util test suite.
java_runtime/tests/classes/java/util/logging/mod.rs	Adds the logging test module root.
java_runtime/tests/classes/java/util/logging/test_handlers.rs	Tests StreamHandler filtering/leveling and Formatter.formatMessage parameter substitution.
java_runtime/tests/classes/java/util/logging/test_level.rs	Tests class registration metadata and Level constants/parse behavior.
java_runtime/tests/classes/java/util/logging/test_log_record.rs	Tests LogRecord metadata initialization, sequencing, and null-level rejection.
java_runtime/tests/classes/java/util/logging/test_logger.rs	Tests logger reuse, hierarchy re-parenting, propagation control, and LogManager reset behavior.

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