Upgrade from Java 6 to Java 11 (AB-163)

[devin-ai-integration]

Summary

Upgrades the DropwizardEmployee project from Java 6 to Java 11 by bumping the Dropwizard framework from 1.0.5 to 2.1.12 and updating all Maven plugins and source code for compatibility.

Key changes:

• Dropwizard: Decoupled BOM version from ${project.version} and pinned to 2.1.12; added dropwizard-dependencies BOM
• Compiler: <source>1.6</source>/<target>1.6</target> → <release>11</release> via maven-compiler-plugin 3.13.0
• Plugins: maven-surefire-plugin 2.19.1→3.2.5, maven-shade-plugin 2.4.3→3.6.0 (with module-info.class exclusion for Java 9+ uber JARs)
• @NotEmpty import: Migrated from deprecated org.hibernate.validator.constraints.NotEmpty to javax.validation.constraints.NotEmpty
• EmployeeDAO: Added explicit cast to Query<Employee> to satisfy Dropwizard 2.1.x's stricter AbstractDAO.list() signature
• Tests: Migrated from JUnit 3 (junit.framework) to JUnit 5 (org.junit.jupiter)

Validated: mvn clean verify passes (compilation, tests, shaded JAR packaging).

Review & Testing Checklist for Human

• Verify the app starts and serves requests — the only existing test is assertTrue(true). Run java -jar target/DropwizardEmployee-1.0.5.jar server example.yml and confirm GET /employee and POST /employee work against the H2 database. This is the most important validation since no integration tests exist.
• Review the unchecked cast in EmployeeDAO.findAll() — the @SuppressWarnings("unchecked") cast from Query<?> to Query<Employee> is a pragmatic fix for the Dropwizard 2.1.x API change. Confirm this is acceptable vs. switching to a typed CriteriaQuery approach.
• Confirm Dropwizard 1.0.5 → 2.1.12 behavioral compatibility — this is a major version jump. Review the Dropwizard upgrade notes for any breaking changes relevant to this app's usage of Hibernate, Jersey, Jetty, and Liquibase migrations.

Notes

• No CI pipeline exists in this repo, so the build was validated locally only.
• The example.yml configuration and migrations.xml Liquibase changeset required no changes.

Link to Devin session: https://app.devin.ai/sessions/9715e771bf3f4ae0b554873d62aa4ba1
Requested by: @wavecreator1

[devin-ai-integration]

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