Integrating Spring Boot with the traditional SSM (Spring + Spring MVC + MyBatis) stack can lead to several subtle configuration pitfalls. Below is a distilled summary of frequent issues and their solutions based on practical troubleshooting. One of the first issues encountered was the IDE marking @RestController as unresolved. This was resolved by explicitly declaring dependency versions in pom.xml, ensuring Maven resolves all required transitive dependencies correctly. A recurring problem involved MyBatis mapper interfaces not being detected. Two effective approaches exist:

• Annotate the main application class with @MapperScan("com.example.mapper") to specify the base package for scanning.
• Alternatively, annotate each individual mapper interface with @Mapper.

Both strategies are valid and can even be used together without conflict. Subsequently, an error indicated that sqlSessionFactory could not be found. Key checks include: 1. Verifying that the MySQL service is running. 2. Ensuring mapper XML files correctly define SQL statements matching interface methods. 3. Confirming that XML resources are included during the build. By default, Maven may exclude non-Java resources from src/main/java. To prevent this, configure the maven-resources-plugin or place XML files under src/main/resources.

Another issue arose from ambiguous bean definitions due to overlapping class names in third-party libraries (e.g., multiple Service classes in different packages). This was mitigated by narrowing the component scan scope in @MapperScan or using more specific package structures to avoid classpath collisions. Ultimately, many of these problems stemmed from incompatible dependency versions—particularly involving JDBC drivers or MyBatis starters. Replacing the entire dependency block with a known-working set resolved lingering inconsistencies. Below is a verified pom.xml configuration: Working Maven Dependencies``` <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target>

mybatis.type-aliases-package=com.example.pojo mybatis.mapper-locations=classpath:mapper/*.xml

</details>With these configurations, the integration stabilizes and functions as expected.