Enable compilation failures on warnings for Testkit backend

Author: injectives

testkit-backend/pom.xml

@@ -61,7 +61,10 @@
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
                 <configuration>
-                    <compilerArgs combine.self="override"/>
+                    <compilerArgs combine.self="override">
+                        <arg>-Xlint:all,-processing</arg>
+                        <arg>-Werror</arg>
+                    </compilerArgs>
                 </configuration>
             </plugin>
             <plugin>

testkit-backend/src/main/java/neo4j/org/testkit/backend/CustomDriverError.java

@@ -18,7 +18,12 @@
  */
 package neo4j.org.testkit.backend;
 
+import java.io.Serial;
+
 public class CustomDriverError extends RuntimeException {
+    @Serial
+    private static final long serialVersionUID = 2979071989786663535L;
+
     public CustomDriverError(Throwable cause) {
         super(cause);
     }

testkit-backend/src/main/java/neo4j/org/testkit/backend/FrontendError.java

@@ -18,4 +18,9 @@
  */
 package neo4j.org.testkit.backend;
 
-public class FrontendError extends RuntimeException {}
+import java.io.Serial;
+
+public class FrontendError extends RuntimeException {
+    @Serial
+    private static final long serialVersionUID = -8369933385092563391L;
+}

testkit-backend/src/main/java/neo4j/org/testkit/backend/holder/RxResultHolder.java

@@ -26,6 +26,7 @@
 import org.neo4j.driver.Record;
 import org.neo4j.driver.reactive.RxResult;
 
+@SuppressWarnings("deprecation")
 public class RxResultHolder extends AbstractResultHolder<RxSessionHolder, RxTransactionHolder, RxResult> {
     @Setter
     private RxBufferedSubscriber<Record> subscriber;

testkit-backend/src/main/java/neo4j/org/testkit/backend/holder/RxSessionHolder.java

@@ -21,6 +21,7 @@
 import org.neo4j.driver.SessionConfig;
 import org.neo4j.driver.reactive.RxSession;
 
+@SuppressWarnings("deprecation")
 public class RxSessionHolder extends AbstractSessionHolder<RxSession> {
     public RxSessionHolder(DriverHolder driverHolder, RxSession session, SessionConfig config) {
         super(driverHolder, session, config);

testkit-backend/src/main/java/neo4j/org/testkit/backend/holder/RxTransactionHolder.java

@@ -20,6 +20,7 @@
 
 import org.neo4j.driver.reactive.RxTransaction;
 
+@SuppressWarnings("deprecation")
 public class RxTransactionHolder extends AbstractTransactionHolder<RxSessionHolder, RxTransaction> {
     public RxTransactionHolder(RxSessionHolder sessionHolder, RxTransaction transaction) {
         super(sessionHolder, transaction);

testkit-backend/src/main/java/neo4j/org/testkit/backend/messages/TestkitModule.java

@@ -19,6 +19,7 @@
 package neo4j.org.testkit.backend.messages;
 
 import com.fasterxml.jackson.databind.module.SimpleModule;
+import java.io.Serial;
 import java.time.LocalDate;
 import java.util.List;
 import neo4j.org.testkit.backend.messages.requests.deserializer.TestkitCypherDateDeserializer;
@@ -57,6 +58,9 @@
 import org.neo4j.driver.types.IsoDuration;
 
 public class TestkitModule extends SimpleModule {
+    @Serial
+    private static final long serialVersionUID = 7051732358423895087L;
+
     public TestkitModule() {
         this.addDeserializer(List.class, new TestkitListDeserializer());
         this.addDeserializer(CypherDateTime.class, new TestkitCypherDateTimeDeserializer());

testkit-backend/src/main/java/neo4j/org/testkit/backend/messages/requests/NewSession.java

@@ -105,6 +105,7 @@ private AsyncSessionHolder createAsyncSessionState(DriverHolder driverHolder, Se
                 driverHolder, driverHolder.getDriver().asyncSession(sessionConfig), sessionConfig);
     }
 
+    @SuppressWarnings("deprecation")
     private RxSessionHolder createRxSessionState(DriverHolder driverHolder, SessionConfig sessionConfig) {
         return new RxSessionHolder(driverHolder, driverHolder.getDriver().rxSession(sessionConfig), sessionConfig);
     }

testkit-backend/src/main/java/neo4j/org/testkit/backend/messages/requests/SessionBeginTransaction.java

@@ -88,6 +88,7 @@ public CompletionStage<TestkitResponse> processAsync(TestkitState testkitState)
     }
 
     @Override
+    @SuppressWarnings("deprecation")
     public Mono<TestkitResponse> processRx(TestkitState testkitState) {
         return testkitState.getRxSessionHolder(data.getSessionId()).flatMap(sessionHolder -> {
             RxSession session = sessionHolder.getSession();

testkit-backend/src/main/java/neo4j/org/testkit/backend/messages/requests/SessionLastBookmarks.java

@@ -50,6 +50,7 @@ public CompletionStage<TestkitResponse> processAsync(TestkitState testkitState)
     }
 
     @Override
+    @SuppressWarnings("deprecation")
     public Mono<TestkitResponse> processRx(TestkitState testkitState) {
         return testkitState
                 .getRxSessionHolder(data.getSessionId())