Fix: Improve Java lexer and endpoint parsing to resolve crashes and newline issues

[ksg97031]

Description

This PR addresses two critical issues identified during testing and development:

1. Handling Empty URLs in Endpoint Parsing

   • Fixed an issue where endpoints with empty URLs were generated, causing crashes during runtime.
   • Added validation to ensure that empty URL strings are properly handled.

2. Improving Java Lexer for Newline Sanitization

   • Resolved a parsing issue where comments between class declarations and RequestMapping annotations were improperly sanitized along with newlines.
   • Adjusted the lexer to correctly process comments and newlines without affecting subsequent mappings.

These changes improve the stability and reliability of endpoint parsing and Java annotation handling in the application.

Changes

• Commit 8650dd4: Added handling for empty URLs in endpoint parsing.
• Commit e04cc638: Prevented crashes caused by empty URL strings.
• Commit 9e70456: Adjusted Java lexer to handle newline sanitization correctly.

Testing

• Verified that endpoints with empty URLs are no longer created.
• Confirmed that comments and newlines between class declarations and annotations are processed correctly.
• Updated unit tests to cover these edge cases.