GH-3168: Document that @LoadBalanced RestClient must not be used in Gateway MVC#4200
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won-seoop wants to merge 1 commit into
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GH-3168: Document that @LoadBalanced RestClient must not be used in Gateway MVC#4200won-seoop wants to merge 1 commit into
won-seoop wants to merge 1 commit into
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…sed with Gateway MVC Document that a custom @LoadBalanced RestClient.Builder bean in the same application context as the gateway will intercept the gateway's internal proxy requests, causing an IllegalArgumentException: Service Instance cannot be null before the lb() filter can resolve the target. Users should rely only on the lb() filter or lb:// URI scheme for load-balanced routing within the gateway; @LoadBalanced is for beans that application code calls directly, not the gateway proxy client. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Closes #3168
When a
@LoadBalanced RestClient.Builderbean exists in the same application context as Spring Cloud Gateway Server MVC, Spring Cloud LoadBalancer intercepts the gateway's internal proxyRestClientrequests before thelb()filter resolves the service instance — causingIllegalArgumentException: Service Instance cannot be null.This was confirmed by @spencergibb in the issue: "Any
RestClientbean used by Gateway MVC should NOT be@LoadBalancedas there is a separatelb()filter for that."This PR adds a
[[loadbalancer-restclient-warning]]section toloadbalancer.adocthat:@LoadBalancedintercepts all outboundRestClientcalls, including the gateway's internal proxy clientService Instance cannot be null)lb()filter orlb://URI scheme for gateway routes, and reserve@LoadBalancedfor beans their own code calls directlyTest plan
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