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${expression}

 
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Head first never mentions ${ notation in book.
is there any specific reason for not metioning $ notation ?


${bookDB.bookDetails.title}

Another way to retrieve component properties is to use the jsp:getProperty element. This element converts the value of the property into a String and inserts the value into the response stream:

<jsp:getProperty name="beanName" property="propName"/>
 
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they do to talk about Expression Language (EL) starting on page 366 of Head First Servlets and JSP
 
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