Upgrade Java 6 to Java 11 with Dropwizard 2.1.12

[devin-ai-integration]

Summary

Upgrades the project 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} (1.0.5) → pinned to 2.1.12; added dropwizard-dependencies BOM
• maven-compiler-plugin 3.6.0 → 3.13.0 with <release>11</release> replacing <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; added module-info.class exclusion filter for uber-JAR compatibility

Source changes:

• EmployeeConfiguration.java: @NotEmpty import moved from org.hibernate.validator.constraints → javax.validation.constraints (the Hibernate-specific annotation was removed in newer versions)
• EmployeeDAO.java: Added explicit cast of namedQuery() result to Query<Employee> to satisfy Dropwizard 2.x's stricter Hibernate typing
• AppTest.java: Migrated from JUnit 3 (junit.framework.TestCase) to JUnit 5 (org.junit.jupiter.api)

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

Review & Testing Checklist for Human

• Start the application locally (java -jar target/DropwizardEmployee-1.0.5.jar server example.yml) and verify it boots without errors — the existing test suite is essentially a no-op (assertTrue(true)) and provides no runtime confidence
• Test the REST endpoints — POST /employee and GET /employee — to verify Hibernate/H2 persistence still works correctly after the Dropwizard 1.x → 2.x upgrade
• Verify the unchecked cast in EmployeeDAO.findAll() doesn't cause ClassCastException at runtime — the @SuppressWarnings("unchecked") cast from Query<?> to Query<Employee> is the riskiest source change
• Check example.yml compatibility — Dropwizard 2.x may have changed config parsing behavior; verify no startup warnings about deprecated/renamed config keys

Notes

• The Dropwizard BOM was previously tied to ${project.version} (1.0.5), meaning all Dropwizard transitive dependency versions were locked to 1.0.5. This PR decouples them to 2.1.12.
• The test suite has no meaningful coverage — only a single assertTrue(true). Runtime smoke-testing is essential.

Link to Devin session: https://app.devin.ai/sessions/ad3edcfb24ce4126842bf5dd0bc7c82c
Requested by: @pqn

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.