websphere liberty java.lang.ClassNotFoundException: javax.servlet.jsp.JspWriter

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websphere liberty java.lang.ClassNotFoundException: javax.servlet.jsp.JspWriter

in server.xml featureManager, 

add jsp-2.3 , servlet-3.1 , then refresh web err is solved.

<featureManager>
    <feature>jsp-2.3</feature>
    <feature>servlet-3.1</feature>
</featureManager>

reference page:

https://www.ibm.com/docs/en/was-liberty/nd?topic=liberty-configuring-javaserver-pages-23