Cast Throwables to Object to preserve toString behavior in ParameterizedLogging

src/main/java/org/openrewrite/java/logging/ParameterizedLogging.java

@@ -57,6 +57,7 @@ public String getDisplayName() {
 
     @Override
     public String getDescription() {
+        //language=markdown
         return "Transform logging statements using concatenation for messages and variables into a parameterized format. " +
                "For example, `logger.info(\"hi \" + userName)` becomes `logger.info(\"hi {}\", userName)`. This can " +
                "significantly boost performance for messages that otherwise would be assembled with String concatenation. " +
@@ -119,7 +120,11 @@ public J.MethodInvocation visitMethodInvocation(J.MethodInvocation method, Execu
                                 MessageAndArguments literalAndArgs = concatenationToLiteral(message, new MessageAndArguments("", new ArrayList<>()));
                                 messageBuilder.append(literalAndArgs.message);
                                 messageBuilder.append("\"");
-                                literalAndArgs.arguments.forEach(arg -> messageBuilder.append(", #{any()}"));
+                                // Cast Throwables to Object to preserve toString() behavior
+                                literalAndArgs.arguments.forEach(arg -> messageBuilder.append(
+                                        TypeUtils.isAssignableTo("java.lang.Throwable", arg.getType()) ?
+                                                ", (Object) #{any()}" :
+                                                ", #{any()}"));
                             } else {
                                 messageBuilder.append("#{any()}");
                             }

src/test/java/org/openrewrite/java/logging/ParameterizedLoggingTest.java

@@ -223,6 +223,7 @@ static void method(Logger logger, String text) {
         );
     }
 
+    @Issue("https://github.com/openrewrite/rewrite-logging-frameworks/issues/257")
     @Test
     void exceptionArgumentsAsConcatenatedString() {
         rewriteRun(
@@ -250,7 +251,7 @@ static void asInteger(Logger logger, String numberString) {
                       try {
                           Integer i = Integer.valueOf(numberString);
                       } catch (NumberFormatException ex) {
-                          logger.debug("some big error: {}", ex);
+                          logger.debug("some big error: {}", (Object) ex);
                       }
                   }
               }

src/test/java/org/openrewrite/java/logging/slf4j/Slf4jBestPracticesTest.java

@@ -110,7 +110,7 @@ void test() {
                       try {
                         throw new IllegalStateException("oops");
                       } catch (Exception e) {
-                        logger.error("aaa: {}", e);
+                        logger.error("aaa: {}", (Object) e);
                         logger.error("bbb: {}", String.valueOf(e));
                         logger.error("ccc: {}", e.toString());
                       }