Fix inspection issues

src/main/java/org/asamk/signal/dbus/DbusCommandHandler.java

@@ -94,7 +94,7 @@ public class DbusCommandHandler {
                         "Multiple users found, you need to specify an account (phone number) with -a");
             }
 
-            return accounts.get(0).getPath();
+            return accounts.getFirst().getPath();
         } catch (UnknownMethod e) {
             // dbus daemon not running in multi-account mode
             return null;

src/main/java/org/asamk/signal/dbus/DbusProperties.java

@@ -52,7 +52,6 @@ public abstract class DbusProperties implements Properties {
     }
 
     @Override
-    @SuppressWarnings("unchecked")
     public Map<String, Variant<?>> GetAll(final String interface_name) {
         final var handler = getHandlerOptional(interface_name);
         if (handler.isEmpty()) {

src/main/java/org/asamk/signal/dbus/DbusSignalImpl.java

@@ -668,7 +668,7 @@ public class DbusSignalImpl implements Signal, AutoCloseable {
     @Override
     public boolean isRegistered(String number) {
         var result = isRegistered(List.of(number));
-        return result.get(0);
+        return result.getFirst();
     }
 
     @Override

src/main/java/org/asamk/signal/jsonrpc/JsonRpcMessage.java

@@ -2,8 +2,6 @@ package org.asamk.signal.jsonrpc;
 
 /**
  * Represents a JSON-RPC (batch) request or (batch) response.
- * https://www.jsonrpc.org/specification
+ * <a href="https://www.jsonrpc.org/specification">https://www.jsonrpc.org/specification</a>
  */
-public sealed abstract class JsonRpcMessage permits JsonRpcBatchMessage, JsonRpcRequest, JsonRpcResponse {
-
-}
+public sealed abstract class JsonRpcMessage permits JsonRpcBatchMessage, JsonRpcRequest, JsonRpcResponse {}

src/main/java/org/asamk/signal/jsonrpc/JsonRpcRequest.java

@@ -6,7 +6,7 @@ import com.fasterxml.jackson.databind.node.ValueNode;
 
 /**
  * Represents a JSON-RPC request.
- * https://www.jsonrpc.org/specification#request_object
+ * <a href="https://www.jsonrpc.org/specification#request_object">https://www.jsonrpc.org/specification#request_object</a>
  */
 public final class JsonRpcRequest extends JsonRpcMessage {
 

src/main/java/org/asamk/signal/jsonrpc/JsonRpcResponse.java

@@ -6,7 +6,7 @@ import com.fasterxml.jackson.databind.node.ValueNode;
 
 /**
  * Represents a JSON-RPC response.
- * https://www.jsonrpc.org/specification#response_object
+ * <a href="https://www.jsonrpc.org/specification#response_object">https://www.jsonrpc.org/specification#response_object</a>
  */
 public final class JsonRpcResponse extends JsonRpcMessage {
 

src/main/java/org/asamk/signal/jsonrpc/SignalJsonRpcCommandHandler.java

@@ -94,7 +94,7 @@ public class SignalJsonRpcCommandHandler {
             if (manager == null) {
                 final var managers = c.getManagers();
                 if (managers.size() == 1) {
-                    manager = managers.get(0);
+                    manager = managers.getFirst();
                 }
             }
             if (manager != null) {

src/main/java/org/asamk/signal/jsonrpc/SignalJsonRpcDispatcherHandler.java

@@ -126,7 +126,7 @@ public class SignalJsonRpcDispatcherHandler {
     private void unsubscribeReceive(final Manager m) {
         final var subscriptionId = receiveHandlers.entrySet()
                 .stream()
-                .filter(e -> e.getValue().size() == 1 && e.getValue().get(0).first().equals(m))
+                .filter(e -> e.getValue().size() == 1 && e.getValue().getFirst().first().equals(m))
                 .map(Map.Entry::getKey)
                 .findFirst();
         subscriptionId.ifPresent(this::unsubscribeReceive);

src/main/java/org/asamk/signal/util/Util.java

@@ -42,7 +42,7 @@ public class Util {
         if (strings.isEmpty()) {
             return "";
         }
-        return strings.get(0) + strings.stream()
+        return strings.getFirst() + strings.stream()
                 .skip(1)
                 .filter(s -> !s.isEmpty())
                 .map(s -> Character.toUpperCase(s.charAt(0)) + s.substring(1).toLowerCase(Locale.ROOT))