Upgrade from Java 6 to Java 11

[devin-ai-integration]

Summary

Upgrades the DropwizardEmployee project from Java 6 to Java 11, including a major Dropwizard framework upgrade from 1.0.5 to 2.1.12 and all necessary source code fixes.

Build changes (pom.xml):

• Decoupled Dropwizard BOM version from ${project.version} — now pinned to 2.1.12
• Added dropwizard-dependencies BOM import for transitive dependency management
• Compiler: <source>1.6</source>/<target>1.6</target> → <release>11</release>
• Plugin upgrades: maven-compiler-plugin 3.6.0→3.13.0, maven-surefire-plugin 2.19.1→3.2.5, maven-shade-plugin 2.4.3→3.6.0
• Added module-info.class exclusion to shade plugin filters (Java 9+ uber-JAR compatibility)

Source code fixes:

• EmployeeConfiguration.java: @NotEmpty import moved from org.hibernate.validator.constraints → javax.validation.constraints (deprecated in newer Hibernate Validator)
• EmployeeDAO.java: namedQuery() → namedTypedQuery() to satisfy Dropwizard 2.x's type-safe AbstractDAO.list(Query<E>) signature
• AppTest.java: Migrated from JUnit 3 (junit.framework.*) to JUnit 5 (org.junit.jupiter.api.*)

Validation: mvn clean verify passes — zero compilation errors, all tests pass.

Review & Testing Checklist for Human

• Verify runtime startup: The test suite is minimal (one trivial assertion). Run java -jar target/DropwizardEmployee-1.0.5.jar server example.yml and confirm the app boots, the /employee GET and POST endpoints respond correctly, and Hibernate initializes against the H2 database without errors.
• Confirm namedTypedQuery behavior: Verify that EmployeeDAO.findAll() returns the correct typed results at runtime — this was changed from namedQuery() to namedTypedQuery() to fix a compilation error with Dropwizard 2.x's stricter generics.
• Review transitive dependency changes: The Dropwizard 1.0.5 → 2.1.12 jump pulls in significantly different transitive dependencies (Jetty 9.4.53, Hibernate 5.6.x, Jackson 2.13.x, Jersey 2.41). Check for any compatibility concerns with downstream consumers.

Notes

• The project version remains 1.0.5 — it is now decoupled from the Dropwizard framework version, which was previously tied via ${project.version}.
• Shade plugin warnings about overlapping resources in the uber-JAR are benign (duplicate LICENSE/NOTICE files from different JARs).
• Jira ticket: AB-159

Link to Devin session: https://app.devin.ai/sessions/97b1ce6dc89b48009fbcee3a8b6b43c1
Requested by: @wavecreator1

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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 3 additional findings.