Upgrade Java 6 to Java 11 with Dropwizard 2.1.12

[devin-ai-integration]

Summary

Upgrades the DropwizardEmployee application from Java 6 to Java 11, including a major Dropwizard framework bump from 1.0.5 to 2.1.12.

Build changes (pom.xml):

• Decoupled Dropwizard BOM version from ${project.version} and pinned to 2.1.12; added dropwizard-dependencies BOM
• maven-compiler-plugin 3.6.0 → 3.13.0 with <release>11</release> (replaces <source>1.6</source>/<target>1.6</target>)
• maven-surefire-plugin 2.19.1 → 3.2.5
• maven-shade-plugin 2.4.3 → 3.6.0 with module-info.class exclusion for uber-JAR compatibility

Source changes:

• EmployeeConfiguration.java: @NotEmpty import moved from deprecated org.hibernate.validator.constraints to javax.validation.constraints
• EmployeeDAO.java: Added unchecked cast on namedQuery() return to Query<Employee> to satisfy Dropwizard 2.x's stricter Hibernate generics
• AppTest.java: Migrated from JUnit 3 (TestCase) to JUnit 5 (Jupiter @Test)

mvn clean verify passes with zero compilation errors and all tests green.

Review & Testing Checklist for Human

• Verify runtime startup: The test suite is trivially minimal (one assertTrue(true)). Manually run java -jar target/DropwizardEmployee-1.0.5.jar server example.yml with Java 11 and confirm the app boots, Hibernate initializes, and /employee endpoints respond correctly.
• Validate the unchecked cast in EmployeeDAO.findAll(): The namedQuery() → Query<Employee> cast is standard but suppresses a type-safety warning. Confirm the named query Employee.findAll returns the expected entity type at runtime.
• Check for Dropwizard 1.x → 2.x behavioral differences: This is a major framework version jump that pulls in Hibernate 5.6.x, Jetty 9.4.53, Jackson 2.13.x, and Jersey 2.41. Review any downstream consumers or deployment configs that may depend on 1.x behavior.

Notes

• The Dropwizard BOM was previously tied to ${project.version} (1.0.5), coupling framework version to artifact version. This PR decouples them so the project version remains 1.0.5 while Dropwizard is at 2.1.12.
• Shade plugin warnings about overlapping META-INF resources across dependencies are benign (LICENSE/NOTICE files).

Link to Devin session: https://app.devin.ai/sessions/83dd5b09a1bf4e3faee5cefbac283d7d
Requested by: @pqn

[devin-ai-integration]

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