GH-43962: [Java] Consider warnings as errors for Adapter Module (#43963)

### Rationale for this change

This PR configs the build such that warnings are considered as errors in the Adapter module. And corresponding code changes have also been made. 

### What changes are included in this PR?

Adding flags to consider warnings as errors in javac and fixing the corresponding errors. 

### Are these changes tested?

Tested by existing test cases. 

### Are there any user-facing changes?

N/A
* GitHub Issue: #43962

Authored-by: Vibhatha Lakmal Abeykoon <[email protected]>
Signed-off-by: David Li <[email protected]>

java/adapter/avro/pom.xml

@@ -56,4 +56,18 @@ under the License.
       <version>${dep.avro.version}</version>
     </dependency>
   </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration combine.children="append">
+          <compilerArgs>
+            <arg>-Werror</arg>
+          </compilerArgs>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
 </project>

java/adapter/avro/src/test/java/org/apache/arrow/adapter/avro/AvroToArrowIteratorTest.java

@@ -50,6 +50,7 @@
 public class AvroToArrowIteratorTest extends AvroTestBase {
 
   @BeforeEach
+  @Override
   public void init() {
     final BufferAllocator allocator = new RootAllocator(Long.MAX_VALUE);
     this.config = new AvroToArrowConfigBuilder(allocator).setTargetBatchSize(3).build();

java/adapter/jdbc/pom.xml

@@ -116,6 +116,15 @@ under the License.
           <argLine>--add-reads=org.apache.arrow.adapter.jdbc=com.fasterxml.jackson.dataformat.yaml --add-opens=java.base/java.nio=org.apache.arrow.memory.core,ALL-UNNAMED -Duser.timezone=UTC</argLine>
         </configuration>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration combine.children="append">
+          <compilerArgs>
+            <arg>-Werror</arg>
+          </compilerArgs>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
 </project>

java/adapter/jdbc/src/test/java/org/apache/arrow/adapter/jdbc/h2/JdbcToArrowCharSetTest.java

@@ -91,6 +91,7 @@ public static Stream<Arguments> getTestData()
    */
   @ParameterizedTest
   @MethodSource("getTestData")
+  @Override
   public void testJdbcToArrowValues(Table table)
       throws SQLException, IOException, ClassNotFoundException {
     this.initializeDatabase(table);

java/adapter/jdbc/src/test/java/org/apache/arrow/adapter/jdbc/h2/JdbcToArrowDataTypesTest.java

@@ -145,6 +145,7 @@ public static Stream<Arguments> getTestData()
   /** Test Method to test JdbcToArrow Functionality for various H2 DB based datatypes. */
   @ParameterizedTest
   @MethodSource("getTestData")
+  @Override
   public void testJdbcToArrowValues(Table table)
       throws SQLException, IOException, ClassNotFoundException {
     this.initializeDatabase(table);

java/adapter/jdbc/src/test/java/org/apache/arrow/adapter/jdbc/h2/JdbcToArrowMapDataTypeTest.java

@@ -45,6 +45,7 @@ public static Stream<Arguments> getTestData() throws IOException {
   /** Test Method to test JdbcToArrow Functionality for Map form Types.OTHER column. */
   @ParameterizedTest
   @MethodSource("getTestData")
+  @Override
   public void testJdbcToArrowValues(Table table)
       throws SQLException, IOException, ClassNotFoundException {
     this.initializeDatabase(table);

java/adapter/jdbc/src/test/java/org/apache/arrow/adapter/jdbc/h2/JdbcToArrowNullTest.java

@@ -113,6 +113,7 @@ public static Stream<Arguments> getTestData()
    */
   @ParameterizedTest
   @MethodSource("getTestData")
+  @Override
   public void testJdbcToArrowValues(Table table)
       throws SQLException, IOException, ClassNotFoundException {
     this.initializeDatabase(table);

java/adapter/jdbc/src/test/java/org/apache/arrow/adapter/jdbc/h2/JdbcToArrowOptionalColumnsTest.java

@@ -59,6 +59,7 @@ public static Stream<Arguments> getTestData()
    */
   @ParameterizedTest
   @MethodSource("getTestData")
+  @Override
   public void testJdbcToArrowValues(Table table)
       throws SQLException, IOException, ClassNotFoundException {
     this.initializeDatabase(table);

java/adapter/jdbc/src/test/java/org/apache/arrow/adapter/jdbc/h2/JdbcToArrowTest.java

@@ -87,6 +87,7 @@ public static Stream<Arguments> getTestData()
    */
   @ParameterizedTest
   @MethodSource("getTestData")
+  @Override
   public void testJdbcToArrowValues(Table table)
       throws SQLException, IOException, ClassNotFoundException {
     this.initializeDatabase(table);

java/adapter/jdbc/src/test/java/org/apache/arrow/adapter/jdbc/h2/JdbcToArrowTimeZoneTest.java

@@ -91,6 +91,7 @@ public static Stream<Arguments> getTestData()
    */
   @ParameterizedTest
   @MethodSource("getTestData")
+  @Override
   public void testJdbcToArrowValues(Table table)
       throws SQLException, IOException, ClassNotFoundException {
     this.initializeDatabase(table);

java/adapter/jdbc/src/test/java/org/apache/arrow/adapter/jdbc/h2/JdbcToArrowVectorIteratorTest.java

@@ -76,6 +76,7 @@ public class JdbcToArrowVectorIteratorTest extends JdbcToArrowTest {
 
   @ParameterizedTest
   @MethodSource("getTestData")
+  @Override
   public void testJdbcToArrowValues(Table table)
       throws SQLException, IOException, ClassNotFoundException {
     this.initializeDatabase(table);

java/adapter/orc/pom.xml

@@ -160,6 +160,15 @@ under the License.
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration combine.children="append">
+          <compilerArgs>
+            <arg>-Werror</arg>
+          </compilerArgs>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
 </project>