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No, in JSP the variable declaration is not at all thread safe as the declared variables are ended up as instance variable in generated servlet not in body of _jspservice() method.

The given declaration is not considered to be thread safe: as they are declarations and are evaluated only one time when page gets loaded.

<%!int a=5;%>

The given declaration is considered thread safe: as in the scriplets the variables that have been declared are not shared ...

Tags: jsp, jsp declaration, jsp thread safe

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