java.lang.NoSuchMethodError: 'boolean org.springframework.core.KotlinDetector.isSuspendingFunction(java.lang.reflect.Method)'

The "java.lang.NoSuchMethodError" is a common error encountered in Spring applications when there is a mismatch between the versions of Spring and Kotlin dependencies. In this blog post, we will explore the steps to resolve this error and ensure compatibility between Spring and Kotlin versions.

When this error occurs, it indicates that the application is unable to find the required method 'isSuspendingFunction' in the KotlinDetector class of the Spring Framework.

To resolve the error, follow this dependencies in pom.xml file:

<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>
		<!-- Spring Framework -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>5.3.9</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-orm</artifactId>
			<version>5.3.9</version>
		</dependency>

		<!-- Hibernate -->
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-core</artifactId>
			<version>5.5.7.Final</version>
		</dependency>
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-entitymanager</artifactId>
			<version>5.5.7.Final</version>
		</dependency>

		<!-- MySQL Connector -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>8.0.27</version>
		</dependency>
		<dependency>
			<groupId>jstl</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
		</dependency>
	</dependencies>

By following these steps, you should be able to resolve the "java.lang.NoSuchMethodError" related to the KotlinDetector in Spring. I hope this is helpful for you.