This artifact originates from the Orbit Project at Eclipse, it is an osgi bundle and is signed as well.
'org.eclipse.jetty.orbit:javax.servlet.jsp.jstl:1.2.0.v201105211821'
<dependency>
<groupId>org.eclipse.jetty.orbit</groupId>
<artifactId>javax.servlet.jsp.jstl</artifactId>
<version>1.2.0.v201105211821</version>
</dependency>
<dependency org="org.eclipse.jetty.orbit" name="javax.servlet.jsp.jstl" rev="1.2.0.v201105211821"/>
"org.eclipse.jetty.orbit", "javax.servlet.jsp.jstl", "1.2.0.v201105211821"