${map.c}

 ${map[c]}

 ${map[“c”]}

 ${map.map.b}

 ${map[map.b]}

 ${map.map（map.b）}

 The servlet’s init method returns a non-zero status.

 The servlet’s init method throws a Servlet Exception

 The servlet’s init method sets the Servlet Response’s context length to 0

 The servlet’s init method sets the Servlet Response’s content type to null.

 The servlet’s init method does NOT return within a time period defined by the servlet container.

 FORM

 DIGEST

 NORMAL

 ENCRYPTED

 CLIENT-CERT

 /WEB-INF/lib as a JAR file

 /META-INF/lib as a JAR file

 /classes as compiled class files

 /WEB-INF/lib as compiled class files

 /WEB-INF/classes as compiled class files

 /META-INF/classes as compiled class files

 ${product ID}

 ${param.productID}

 ${params.productID}

 ${params.productID[1]}

 ${paramvalues.productID}

 ${paramValues.productID[0]}

 ${pageContext.request.productID}