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@Copilot Copilot AI commented May 19, 2025

Overview

This PR implements comprehensive worker-side exception serialization in Java, addressing the need for better error details when exceptions occur in activities or orchestrations. The implementation matches the quality of the .NET version referenced in the issue.

Key Features

  • Complete Stack Traces: Full stack trace information including nested exceptions with proper "Caused by:" sections
  • Multiline Message Support: Correctly preserves multiline exception messages
  • Inner Exception Handling: Captures the complete cause chain of exceptions
  • Circular Reference Detection: Detects and prevents infinite recursion in exception chains
  • Suppressed Exceptions: Properly includes suppressed exceptions in the stack trace
  • Optimized Stack Traces: Removes duplicate frames in chained exceptions (similar to Java's default printing)

Implementation Details

  • Enhanced getFullStackTrace() method with recursive exception traversal
  • Added special handling for null messages, circular references, and custom exception types
  • Created comprehensive test coverage for various exception scenarios:
    • Multiline exception messages
    • Deeply nested exceptions (multiple levels)
    • Custom exceptions with non-standard toString() implementations
    • Circular reference detection
    • Suppressed exceptions

Test Coverage

  • Added unit tests to verify serialization of complex exceptions
  • Created integration tests that validate behavior in real orchestration scenarios
  • Tested edge cases like null messages, circular references, and deep nesting

Sample Exception Output

The formatted exceptions now include:

java.lang.RuntimeException: Outer exception
	at com.microsoft.durabletask.ExceptionTest.method(ExceptionTest.java:25)
	at com.microsoft.durabletask.ExceptionTest.main(ExceptionTest.java:10)
Caused by: java.lang.IllegalArgumentException: Inner exception
	at com.microsoft.durabletask.ExceptionTest.causeMethod(ExceptionTest.java:30)
	... 2 more

Fixes #205.

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@Copilot Copilot AI changed the title [WIP] TODO: Implement worker-side exception serialization Implement worker-side exception serialization for comprehensive error handling May 19, 2025
@Copilot Copilot AI requested a review from YunchuWang May 19, 2025 23:06
Copilot finished work on behalf of YunchuWang May 19, 2025 23:06
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TODO: Implement worker-side exception serialization
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