## SpringMVC framework If you use EL expressions, so why the error?

In SpringMVC framework, we may take advantage of El expression to get the current project name, but turned out to be an error?

　　 <a href="user/testController?username=hehe">请求测试1</a>
    <a href="/user/testController?username=haha&password=123">请求测试2</a>
    <a href="${pageContext.request.contextPath}/user/testController?username=haha&password=123">请求测试3</a>

We can see that the above code is no problem, but why choose request a test to three, being given it?

　　abnormal:

<% - [/ $% 7BpageContext.request.contextPath % 7D / user / testController] in DispatcherServlet with name 'DispatcherServlet' -%> 
later learned that, in the jsp, if the selected format, then the head jsp have such a property: isELIgnored = "false", what does that mean? 

If set to true, then the JSP expression is treated as a character string. Example, the following expression is $ 20 {2000%}, when the output isELIgnored = "true" for the $ 20 {2000%}, 
and the output 100 is isELIgnored = "false". Web container default isELIgnored = "false".

Therefore, we recommend jsp head plus isELIgnored = "false" attribute, so we can use the EL expression

## SpringMVC framework If you use EL expressions, so why the error?

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