Failed to load or instantiate TagLibraryValidator class: org.apache.taglibs.standard.tlv.JstlCoreTLV

Question

So I was working with JSTL in OSGi, under Gemini runtime. And I\'m getting following exception, when I try to access the url to my servlet: -

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Answer 1

I upgraded from Tomcat 8 to Tomcat 9, which has 125: jstl.jar,taglibs-standard-spec-*.jar, in its catalina.properties. Does this mean that jstl is preinstalled, unlike tomcat 8 where jstl 1.2 was needed in the build.gradle ?

Since I had to remove the following lines to get it working

//compile group: 'javax.xml.bind', name: 'jaxb-api', version: '2.3.0'
//compile group: 'javax.servlet.jsp.jstl', name: 'jstl', version: '1.2'

If my answer is incorrect, please let me know I am happy to delete it. Since @BalusC answer gave me the clue.