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