에러 : ClassNotFoundException: javax.servlet.jsp.tagext.TagLibraryValidator

 

java.lang.ClassNotFoundException : javax.servlet.jsp.tagext.TagLibraryValidator 에러 발생 이유는

 

Spring boot 3.0 이상 버전에서 jstl 을 추가 할 때는 !

jstl 1.2 버전 사용 불가 !! ❌

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
</dependency>

 

 

 

따라서

<!-- jstl -->
		<!-- https://mvnrepository.com/artifact/jakarta.servlet.jsp.jstl/jakarta.servlet.jsp.jstl-api -->

		<dependency>
			<groupId>jakarta.servlet.jsp.jstl</groupId>
			<artifactId>jakarta.servlet.jsp.jstl-api</artifactId>
			<version>3.0.0</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/jakarta.servlet/jakarta.servlet-api -->
		<dependency>
			<groupId>jakarta.servlet</groupId>
			<artifactId>jakarta.servlet-api</artifactId>
			<version>6.0.0</version>
			<scope>provided</scope>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.glassfish.web/jakarta.servlet.jsp.jstl -->
		<dependency>
			<groupId>org.glassfish.web</groupId>
			<artifactId>jakarta.servlet.jsp.jstl</artifactId>
			<version>3.0.1</version>
		</dependency>

 

해당 코드를 pom.xml에 추가 하면서 버전 올려주기