Ankur
8547981634
Companion code for the ankurm.com guide. Verified on Spring Boot 4.1.0, spring-grpc 1.1.0,
grpc-java 1.80.0, protobuf-java 4.34.2, JDK 25.0.3. results-full.txt is unedited mvn test
output: 11 tests, 0 failures. No installs needed - protoc and the gRPC codegen plugin resolve
as Maven artifacts, and every test uses the in-process transport.
_01_basics all four call types and how their failure modes differ: iterator semantics on
server streaming, the half-close that client streaming hangs without, and the
independence of the two streams in bidi.
_02_troubleshooting
four failures reproduced then fixed - the 4 MB message limit and which side
enforces it, the absent default deadline, cancellation that never interrupts a
thread, and errors that arrive as UNKNOWN with no description.
_03_exceptions @GrpcAdvice / @GrpcExceptionHandler: domain exception to NOT_FOUND with
trailers, validation to INVALID_ARGUMENT, and a catch-all that returns a
deliberate INTERNAL without leaking the original message across the boundary.
docs/01 symptom-first troubleshooting index, each entry marked [tested] or [documented]
docs/02 complete spring.grpc.* property reference, and the split between the Boot 4.1
integration (org.springframework.boot, version 4.1.0, owns properties and
auto-configuration) and the Spring gRPC project (org.springframework.grpc,
version 1.1.0, owns the programming model). The older standalone
spring-grpc-spring-boot-starter stops at 1.0.3 and is what most search results
describe.
Findings worth the commit message
- The in-process transport CANNOT enforce message size limits: it passes messages by
reference and never serialises them. A 4 MB + 1 KB message goes through cleanly in tests
and fails in production with RESOURCE_EXHAUSTED. The test asserts this rather than
pretending otherwise. Same blind spot covers compression, TLS, keepalive and LB.
- Two property names cost real time while writing this:
spring.grpc.server.inprocess.name (not in-process) and
spring.grpc.client.channel.<n>.target (singular channel, and target not address).
The second failure surfaces as UnknownHostException on the channel NAME.
- gRPC still has no default deadline, and cancellation only sets a Context flag.
12 lines
154 B
Plaintext
12 lines
154 B
Plaintext
target/
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*.class
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t1.txt
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t2.txt
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gen.txt
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.idea/
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*.iml
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.vscode/
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.DS_Store
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# results-full.txt IS committed on purpose -- it is the evidence for the blog post
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