StreamConstraintsException when generating audio - Jackson 20MB string limit

[offnertho]

Description:

This is a client library issue related to Jackson's StreamReadConstraints limiting audio response processing.

Environment details

• Programming language: Java/Kotlin
• OS: macOS/Linux/Windows (affects all platforms)
• Language runtime version: Java 17+
• Package version: com.google.genai:google-genai:1.10.0

Steps to reproduce

1. Use the SDK to call generateContentStream() with audio response modality
2. Provide text input that generates audio responses larger than ~20MB
3. Observe StreamConstraintsException thrown by Jackson

Expected Behavior:
The SDK should handle audio responses of any reasonable size, as audio generation commonly produces responses larger than 20MB.

Actual Behavior:
The SDK fails with:
com.fasterxml.jackson.core.exc.StreamConstraintsException: String value length (20048112) exceeds the maximum allowed (20000000, from
StreamReadConstraints.getMaxStringLength())
at com.google.genai.JsonSerializable.stringToJsonNode(JsonSerializable.java:146)

Additional Context:
Audio generation is a standard use case for the Gemini API, and the 20MB limit makes the SDK unusable for this purpose. The limit should be removed or significantly increased
for audio responses.