taglib-bean
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The <bean:define>
tag differs from <jsp:useBean>
in several ways, including:
- Unconditionally creates (or replaces) a bean under the specified identifier.
- Cancreate a bean with the value returned by a property getter of adifferent bean (including properties referenced with a nested and/orindexed property name).
- Can create a bean whose contents is a literal string (or the result of a runtime expression) specified by the
value
attribute. - Does not support nested content (such as
<jsp:setProperty>
tags) that are only executed if a bean was actually created.
If you use another tag to create the body content (e.g. bean:write),that tag must return a non-empty String. An empty String equates to anempty body or a null String, and a new scripting variable cannot bedefined as null. Your bean must return a non-empty String, or thedefine tag must be wrapped within a logic tag to test for an empty ornull value.
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