Add CLI classpath options

[dlunch]

Summary

• add -cp and -classpath launcher options with CLASSPATH and current-directory fallback
• match Oracle launcher argument boundaries and ignore user classpath in CLI -jar mode
• preserve the public run API classpath behavior and built-in runtime priority
• make URLClassLoader recognize directory entries without trailing slashes and continue past missing entries

Validation

• cargo test --workspace --quiet (246 passed, 1 ignored)
• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets -- -D warnings
• git diff --check

Notes

The local environment does not contain an Oracle rt.jar, so the external JRE smoke test was not run. The same directory and JAR lookup paths are covered with repository fixtures and actual CLI process tests.

[codecov]

Codecov Report

❌ Patch coverage is 99.21875% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.89%. Comparing base (fd629c7) to head (230b36c).

Files with missing lines	Patch %	Lines
java_runtime/src/classes/java/lang/class_loader.rs	95.83%	1 Missing ⚠️
...classes/org/rustjava/lang/rust_jar_class_loader.rs	97.91%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #184      +/-   ##
==========================================
+ Coverage   86.50%   86.89%   +0.38%     
==========================================
  Files         207      208       +1     
  Lines       20224    20420     +196     
==========================================
+ Hits        17495    17744     +249     
+ Misses       2729     2676      -53     

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[Copilot]

Pull request overview

Adds Java-launcher-compatible classpath handling to the rust_java CLI, aligning option parsing with the Oracle launcher while preserving the existing run API behavior. It also improves URLClassLoader resource lookup semantics around directory entries and missing URLs.

Changes:

• Add -cp / -classpath support with CLASSPATH and current-directory fallback, and ignore user classpath in CLI -jar mode.
• Refactor classpath property construction into a dedicated helper and add unit/integration coverage for launcher parsing/behavior.
• Update URLClassLoader to treat directory URLs without trailing slashes as directories and to continue searching after missing entries.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tests/test_cli.rs	Adds end-to-end CLI tests for classpath options, env fallback, -jar behavior, and error reporting.
src/main.rs	Implements launcher-style argument parsing (-cp/-classpath/-jar) and wires computed classpath into run.
src/lib.rs	Extracts classpath property construction into build_class_path and adds unit tests for ordering/empty entries.
java_runtime/tests/classes/java/net/test_url_class_loader.rs	Adds regression test ensuring missing URL entries don’t prevent later JAR resource lookup.
java_runtime/src/classes/java/net/url_class_loader.rs	Updates URLClassLoader::findResource directory/jar detection and missing-entry behavior.

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