typo

Author: nosan

spring-boot-project/spring-boot-testcontainers/src/main/java/org/springframework/boot/testcontainers/context/TestcontainersBeanRegistrationAotProcessor.java

@@ -52,8 +52,8 @@ public BeanRegistrationAotContribution processAheadOfTime(RegisteredBean registe
 		String attributeName = TestcontainerFieldBeanDefinition.class.getName();
 		Object field = bd.getAttribute(attributeName);
 		if (field != null) {
-			Assert.isInstanceOf(Field.class, field, "BeanDefinition attribute '" + attributeName
-					+ "' value must be a type of '" + field.getClass().getName() + "'");
+			Assert.isInstanceOf(Field.class, field,
+					"BeanDefinition attribute '" + attributeName + "' value must be a type of '" + Field.class + "'");
 			return BeanRegistrationAotContribution.withCustomCodeFragments(
 					(codeFragments) -> new AotContribution(codeFragments, registeredBean, ((Field) field)));
 		}