Stack Exchange
JSP with JSTL not working on tomcat 8 in a Spring Boot Application
I have include these dependency in pom.xml.
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>

Still i am getting javax.servlet.ServletException: java.lang.NoSuchMethodError: org.apache.el.lang.ELSupport.coerceToType(Ljavax/el/ELContext;Ljava/lang/Object;Ljava/lang/Class;)Ljava/lang/Object;
I also included one more dependency in pom.xml.
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <scope>provided</scope>
    </dependency>

Then the error changed to An exception occurred processing JSP page /WEB-INF/views/index.jsp at line 7 4: <%@ page session="false" %> [[[[ JSTL CODE USING EXPRESSION LANGUAGE]]]
Everything is working fine in eclipse ide but not working on deploying on separate tomcat  server.

You are getting below error because of the presence of tomcat-embed-el-8.0.32.jar in your Tomcat 8.0\webapps\AppName\WEB-INF\lib folder.
javax.servlet.ServletException: java.lang.NoSuchMethodError:
org.apache.el.lang.ELSupport.coerceToType(Ljavax/el/ELContext;Ljava/lang/Object;Ljava/lang/Class;)Ljava/lang/Object;

This error is due to the conflict between the ELSupport.class provided by Tomcat and tomcat-embed-el-8.0.32.jar present in the applications lib directory, hence you get that error in Tomcat. And it works fine in Eclipse since it uses embedded server.
To fix this issue add below code in your pom.xml:
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-el</artifactId>
    <scope>provided</scope>
</dependency>

When you add tomcat-embed-el dependency as scope=required then the tomcat-embed-el-8.0.32.jar will not be added into your \AppName\WEB-INF\lib folder.
For information check this Issue on Spring-Boot's Github repository.
Also you can use these sample apps:

Spring-Boot-Jsp-Demo configured with InternalResourceViewResolver bean.
spring-boot-sample-tomcat-jsp configured with application.properties just like in the spring-boot sample apps.

