If you are managing your project with Maven, you should also apply these extra steps.
1. Add this repository element either into pom.xml/<project>/<repositories>, or into conf/settings.xml/<profiles>/<profile>/<repositories>.
<repository>
<id>java.net</id>
<url>http://download.java.net/maven/1</url>
<layout>legacy</layout>
</repository>
<id>java.net</id>
<url>http://download.java.net/maven/1</url>
<layout>legacy</layout>
</repository>
2. Add this dependency element into pom.xml/<project>/<dependencies>.
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
<scope>provided</scope>
</dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
<scope>provided</scope>
</dependency>