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fix: Add no-arg overload for getUserInput() in RequestContext to avoid#673

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ehsavoie wants to merge 1 commit intoa2aproject:maina2aproject/a2a-java:mainfrom
ehsavoie:issue_668ehsavoie/a2a-java:issue_668Copy head branch name to clipboard
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fix: Add no-arg overload for getUserInput() in RequestContext to avoid#673
ehsavoie wants to merge 1 commit intoa2aproject:maina2aproject/a2a-java:mainfrom
ehsavoie:issue_668ehsavoie/a2a-java:issue_668Copy head branch name to clipboard

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passing null for default delimiter.

Fixes issue #668

Fixes #668 🦕

@ehsavoie ehsavoie requested a review from kabir February 18, 2026 15:50
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Summary of Changes

Hello @ehsavoie, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the RequestContext class by providing a more convenient way to retrieve user input. It introduces an overloaded getUserInput() method that automatically uses a newline delimiter, eliminating the need for callers to explicitly pass null or "\n" for this common use case. This improves API ergonomics and clarity.

Highlights

  • New Method Overload: Introduced a new getUserInput() method without arguments, which defaults to using a newline character (\n) as the delimiter for extracting text content.
  • Null Delimiter Handling: Modified the getUserInput(String delimiter) method to explicitly mark the delimiter parameter as @Nullable and refactored its internal logic to use a local variable for handling the default newline delimiter when null is passed.
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Code Review

This pull request introduces a convenient no-argument overload for getUserInput() to default to a newline delimiter. The changes are good, but I've found a critical bug where a NullPointerException can occur, and a minor issue in the Javadoc for the new method. Please see my comments for details.

delimiter = "\n";
delim = "\n";
}
return getMessageText(params.message(), delimiter);
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critical

The local variable delim is correctly initialized with a default value if delimiter is null, but the original delimiter is then passed to getMessageText. This will cause a NullPointerException if getUserInput(null) is called, because String.join (used inside getMessageText) does not accept a null delimiter. The delim variable should be used in the method call instead.

Suggested change
return getMessageText(params.message(), delimiter);
return getMessageText(params.message(), delim);

* <b>Examples:</b>
* <pre>{@code
* // Join with newlines (common for multi-paragraph input)
* String text = context.getUserInput("\n");
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medium

The Javadoc example for the new getUserInput() method is incorrect. It shows a call to getUserInput("\n"), which is the method it's meant to simplify. The example should demonstrate the use of the no-argument overload.

Suggested change
* String text = context.getUserInput("\n");
* String text = context.getUserInput();

passing null for default delimiter.

Fixes issue a2aproject#668

Signed-off-by: Emmanuel Hugonnet <ehugonne@redhat.com>
delim = "\n";
}
return getMessageText(params.message(), delimiter);
return getMessageText(params.message(), delim);
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Small suggestion. How about using a ternary operator here? It might make the code simpler.

return getMessageText(params.message(), (delimiter == null) ? "\n" : delimiter);

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[Feat]: Add no-arg overload for getUserInput() in RequestContext to avoid passing null for default delimiter

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