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fix: Avoid NPE in McpClientSession #607

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fix: Avoid NPE in McpClientSession #607

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10 changes: 9 additions & 1 deletion 10 mcp-core/src/main/java/io/modelcontextprotocol/spec/McpClientSession.java
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Original file line number Diff line number Diff line change
Expand Up @@ -283,7 +283,15 @@ public <T> Mono<T> sendRequest(String method, Object requestParams, TypeRef<T> t
deliveredResponseSink.complete();
}
else {
deliveredResponseSink.next(this.transport.unmarshalFrom(jsonRpcResponse.result(), typeRef));
var result = jsonRpcResponse.result();
var unmarshalled = this.transport.unmarshalFrom(result, typeRef);
// https://github.com/modelcontextprotocol/java-sdk/issues/605
if (unmarshalled != null)
deliveredResponseSink.next(unmarshalled);
else
// NB: next() cannot be called with null
deliveredResponseSink
.error(new IllegalStateException("Failed to unmarshal response: " + jsonRpcResponse));
}
}
});
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