Ankur
cd82ab9275
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: 8 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.
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.
109 lines
4.0 KiB
XML
109 lines
4.0 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Companion code for "Spring gRPC with Spring Boot 4" (ankurm.com).
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mvn test
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Nothing to install: protoc and the gRPC codegen plugin are downloaded as Maven artifacts, and
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every test runs over gRPC's in-process transport, so no port is bound.
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-->
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>4.1.0</version>
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<relativePath/>
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</parent>
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<groupId>com.ankurm.grpc</groupId>
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<artifactId>spring-grpc-boot4</artifactId>
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<version>1.0.0</version>
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<name>Spring gRPC with Spring Boot 4</name>
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<properties>
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<java.version>25</java.version>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<dependencies>
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<!--
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Boot 4 promotes gRPC to a first-class starter. On Boot 3 you reached for the community
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spring-grpc project (or grpc-spring-boot-starter); these are maintained by the Boot team
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and version-managed by the Boot BOM.
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-->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-grpc-server</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-grpc-client</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-grpc-server-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-grpc-client-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.awaitility</groupId>
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<artifactId>awaitility</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<!--
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Generates Java from src/main/proto. protoc itself and the gRPC codegen plugin are
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resolved as Maven artifacts for the current OS and architecture, so there is nothing
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to install and the build is reproducible on any machine.
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-->
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<plugin>
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<groupId>io.github.ascopes</groupId>
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<artifactId>protobuf-maven-plugin</artifactId>
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<configuration>
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<protocVersion>${protobuf-java.version}</protocVersion>
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<binaryMavenPlugins>
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<binaryMavenPlugin>
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<groupId>io.grpc</groupId>
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<artifactId>protoc-gen-grpc-java</artifactId>
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<version>${grpc-java.version}</version>
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</binaryMavenPlugin>
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</binaryMavenPlugins>
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</configuration>
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<executions>
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<execution>
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<goals>
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<goal>generate</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-surefire-plugin</artifactId>
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<configuration>
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<redirectTestOutputToFile>false</redirectTestOutputToFile>
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<trimStackTrace>false</trimStackTrace>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>
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