Configure logback to always log exception messages in a specific field (#495)

Author: rob93c

src/main/java/com/github/stickerifier/stickerify/bot/Stickerify.java

@@ -1,6 +1,5 @@
 package com.github.stickerifier.stickerify.bot;
 
-import static com.github.stickerifier.stickerify.logger.StructuredLogger.EXCEPTION_MESSAGE_LOG_KEY;
 import static com.github.stickerifier.stickerify.logger.StructuredLogger.FILE_ID_VALUE;
 import static com.github.stickerifier.stickerify.logger.StructuredLogger.FILE_PATH_LOG_KEY;
 import static com.github.stickerifier.stickerify.logger.StructuredLogger.ORIGINAL_REQUEST_LOG_KEY;
@@ -88,10 +87,7 @@ public int process(List<Update> updates) {
 
 	@Override
 	public void onException(TelegramException e) {
-		LOGGER.at(Level.ERROR)
-				.setCause(e)
-				.addKeyValue(EXCEPTION_MESSAGE_LOG_KEY, e.getMessage())
-				.log("An unexpected failure occurred");
+		LOGGER.at(Level.ERROR).setCause(e).log("An unexpected failure occurred");
 	}
 
 	@Override

src/main/java/com/github/stickerifier/stickerify/logger/StructuredLogger.java

@@ -15,7 +15,6 @@ public record StructuredLogger(Logger logger) {
 	private static final String REQUEST_DETAILS_LOG_KEY = "request_details";
 	private static final String FILE_ID_LOG_KEY = "file_id";
 	private static final String MIME_TYPE_LOG_KEY = "mime_type";
-	public static final String EXCEPTION_MESSAGE_LOG_KEY = "exception_message";
 	public static final String ORIGINAL_REQUEST_LOG_KEY = "original_request";
 	public static final String FILE_PATH_LOG_KEY = "file_path";
 	public static final String STICKER_LOG_KEY = "sticker";

src/main/resources/logback.xml

@@ -15,6 +15,9 @@
                 </pattern>
                 <message/>
                 <keyValuePairs/>
+                <throwableMessage>
+                    <fieldName>exception_message</fieldName>
+                </throwableMessage>
                 <stackTrace/>
             </providers>
         </encoder>