| name | java-legacy-analysis |
| description | Analyzes legacy Java applications (Java EE, Servlets, JSP, EJB, Spring) for migration readiness. Use when analyzing Java code structure, identifying framework-specific patterns, or understanding legacy Java architectures. |
Purpose
Provide specialized knowledge for analyzing legacy Java applications to support migration planning and business logic extraction.
Application Type Detection
| Type | Key Indicators |
|---|
| Servlet/JSP | web.xml, HttpServlet, doGet/doPost, *.jsp files |
| EJB | @Stateless, @Stateful, @MessageDriven, ejb-jar.xml |
| Spring (legacy) | applicationContext.xml, @Controller, @Service, @Repository |
| Spring Boot | @SpringBootApplication, application.properties, pom.xml with spring-boot-starter |
| Struts | struts-config.xml, Action classes, ActionForm |
| JSF | faces-config.xml, @ManagedBean, *.xhtml Facelets |
Java Version Detection
- Check
pom.xml for <maven.compiler.source> and <maven.compiler.target>
- Check
build.gradle for sourceCompatibility and targetCompatibility
- Look for
MANIFEST.MF entries
- Identify Java-version-specific APIs in use
Key Analysis Areas
Dependency Injection
- Spring XML:
<bean> definitions in XML config
- Spring Annotations:
@Autowired, @Component, @Service
- CDI (Java EE):
@Inject, @Named, beans.xml
- EJB:
@EJB injection
Data Access Patterns
- JDBC direct:
DriverManager.getConnection, PreparedStatement
- JPA/Hibernate:
@Entity, EntityManager, @PersistenceContext
- Spring Data:
JpaRepository, CrudRepository interfaces
- MyBatis:
@Mapper, XML SQL mappings
Web Service Patterns
- SOAP:
@WebService, @WebMethod, WSDL files
- JAX-RS (REST):
@Path, @GET, @POST, @Produces
- Spring MVC REST:
@RestController, @RequestMapping
Authentication
- JAAS:
LoginModule, jaas.conf
- Spring Security:
WebSecurityConfigurerAdapter, @Secured
- Container-managed:
web.xml security constraints, @RolesAllowed
Configuration Sources
application.properties / application.yml (Spring)web.xml (Servlet config)- JNDI lookups (
InitialContext.lookup)
- System properties and environment variables
Migration Target Recommendations
| Legacy Source | Recommended Target | Rationale |
|---|
| Servlets/JSP | Spring Boot MVC | Modern, well-supported, familiar patterns |
| EJB | Spring Boot services | CDI-like DI, simpler deployment |
| Struts | Spring Boot MVC | Direct action-to-controller mapping |
| JSF | Spring Boot + Thymeleaf or React | Server-side or SPA depending on complexity |
| SOAP services | Spring Boot REST | RESTful APIs are the modern standard |
| Java EE 7/8 | Jakarta EE 10+ or Spring Boot 3 | Either path viable, Spring Boot more common |
