import

An import attribute describes the types that are available to the 

scripting environment. The value is as in an import declaration in the 

Java programming language, i.e. a (comma separated) list of either a 

fully qualified Java programming language type name denoting that 

type, or of a package name followed by the  .*  string, denoting all 

the public types declared one in that package. The import list shall be 

imported by the translated JSP page implementation and are thus 

available to the scripting environment.

The default import list is 

java.lang.*

, 

javax.servlet.*

, 

javax.servlet.jsp.*

 and 

javax.servlet.http.*

.

This value is currently only defined when the value of the 

language

directive is  

java

 .

session

Indicates that the page requires participation in an (http) session.

If  

true

  then the implicit script language variable named 

session

  of type 

javax.servlet.http.HttpSession

references the current/new session for the page. 

If  

false

  then the page does not participate in a session; the 

session

  implicit variable is unavailable, and any reference to it 

within the body of the JSP page is illegal and shall result in a fatal 

translation error.

Default is  

true

 .

buffer

Specifies the buffering model for the initial  

out

JspWriter

 to 

handle content output from the page.

If  

none

 , then there is no buffering and all output is written directly 

through to the 

ServletResponse PrintWriter

. 

If a buffer size is specified (e.g 

12kb

) then output is buffered with a 

buffer size not less than that specified.

Depending upon the value of the  

autoFlush

  attribute, the contents 

of this buffer is either automatically flushed, or an exception is raised, 

when overflow would occur.

The default is buffered with an implementation buffer size of not less 

than 

8kb

.

autoFlush

Specifies whether the buffered output should be flushed automatically 

( 

true

  value) when the buffer is filled, or whether an exception 

should be raised ( 

false

  value) to indicate buffer overflow.

The default is  

true

 .

Note: it is illegal to set 

autoFlush

 to  

false

  when 

buffer=none

 .

45

JavaServer Pages 1.1 Specification  

November 30, 1999