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Add cqrs module: CQRS in Spring Boot Without a Framework

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Separate write/read DataSources, a JPA command side, and two interchangeable
projection listeners (sync and @Async) demonstrating the real latency-versus-
freshness trade-off CQRS forces. Includes a reflection-based proof that the
query side has no dependency on the write side, and a real failure/fix
transcript for the -parameters compiler flag this standalone reactor doesn't
inherit from spring-boot-starter-parent.
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asmhatre
2026-10-03 20:59:55 +00:00
parent d815a37f2e
commit b4a623b889
27 changed files with 1086 additions and 0 deletions
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cqrs/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.ankurm</groupId>
<artifactId>spring-modulith-demo</artifactId>
<version>1.0.0</version>
</parent>
<artifactId>cqrs</artifactId>
<packaging>jar</packaging>
<name>cqrs</name>
<description>Command/query separation with plain Spring: a JPA write model, a second H2 database
holding a denormalized read model that the query side reaches only through its own JdbcTemplate,
and two interchangeable projection listeners (synchronous and @Async) that show the actual
latency-versus-freshness trade-off CQRS makes you choose, not just assert.</description>
<properties>
<java.version>25</java.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${spring-boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<!-- Test -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.awaitility</groupId>
<artifactId>awaitility</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-resttestclient</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-restclient</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<finalName>cqrs</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<!-- This module does not inherit spring-boot-starter-parent, which is what
normally passes -parameters to javac for free. Without it, every
@PathVariable/@RequestParam here that relies on the parameter's own
name (no explicit name="..." attribute) fails at request time with
"Name for argument of type [...] not specified", a real failure,
reproduced and captured in cqrs/output/03-missing-parameters-flag-failure.txt,
not a defensive comment. -->
<parameters>true</parameters>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>