fix(core): avoid json-format output invoking constructors. #3111#3116
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hengyunabc merged 1 commit intoalibaba:masterfrom Dec 26, 2025
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fastjson2 may create a default instance via no-arg constructor when building writers, which can trigger side effects (e.g. singleton guards) during `options json-format true`. Use a custom ObjectWriterProvider that disables default value instantiation and share the JSON config via ObjectView.toJsonString(), reused by McpObjectVOFilter. Fixes alibaba#3111
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fastjson2 may create a default instance via no-arg constructor when building
writers, which can trigger side effects (e.g. singleton guards) during
options json-format true.Use a custom ObjectWriterProvider that disables default value instantiation
and share the JSON config via ObjectView.toJsonString(), reused by
McpObjectVOFilter.
Fixes #3111