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JSP General notes

General Syntax

Single Java instruction or variable in the HTML context

'<%=LanguageUtil.get(locale, "key-name")%>'

Java code block

<%
  String s = "";
%>

Java code outside doGet() and doPost()

<%! code %>

The exclamation mark makes all the difference. Since it's outside any method, such code typically includes things like variable declarations and complete method declarations. For example:

<%! public static MyType varbl;

public long countEm() {
  long retval = 0L;
  retval *= varbl.toLong();
  return retval;
}
%>

pageContext

pageContext is an implicit object

Never do that!

Stupid comment -.-

<% } else { //elsecomment %>

But IDE like eclipse doesn't recognize that as an error!

Double double quotes?

This code is valid!

"<%=LanguageUtil.get(pageContext, "key.value")%>";

JSP size got a limit!

GENERATED JSP IS EXCEEDING THE 65535 BYTES LIMIT

You are a bad programmer!

Static include

Poor practice but it works.

<%@include file="db.jsp" %>