Member Avatar for vikasj

Hi, I want to display data which i have entered through form(html or jsp) into database.
I have a servlet and a bean with a function of database retreival.
I have got one attribute value in servlet through session transfer into bean's method to retrive data with respect to that attribute and stored into respective set methods and then use jsp form to retreive data using get methods but its showing all values null.Why, while bean have already set value to each respective attribute?
So, why i am unable to fetch values from bean to jsp.:(

Edited by vikasj because: n/a
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  • Latest Post Latest Post by peter_budo

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As noted, the exact servlet-to-JSP transfer matters. Typical causes when a bean set in a servlet shows nulls in a JSP are scope/name mismatches or the JSP creating a different instance than the servlet set. The checklist below covers the frequent, diagnosable faults that produce the symptom described by .

  • Scope mismatch: request attributes are lost on sendRedirect; session attributes survive. Ensure the attribute is stored and retrieved from the same scope and that forwarding/redirect behavior is correct.
  • Attribute-name mismatch: the key used in setAttribute must match the one used in getAttribute/<jsp:useBean>/EL.
  • JSP bean instantiation: <jsp:useBean> with the wrong scope or class can create a fresh bean (all nulls). If the servlet placed the bean in session, the JSP must look in session.
  • JavaBean contract: setters/getters must be public and follow standard names (setFoo/getFoo). If getters return defaults or the setters are never reached, JSP sees nulls.
  • Lifecycle issues: setting bean properties on a local servlet object without calling setAttribute, or setting attributes after a forward/redirect, will not expose values to the JSP. Also check the JSP does not disable session (e.g., session="false").

A practical debug flow: log the bean and its properties immediately after setting them in the servlet; confirm setAttribute is called before dispatch; inspect the presence of the attribute from within a small diagnostic JSP (or server console) using the same scope. These checks quickly reveal whether the problem is a scope/name/lifecycle issue or a bean-definition problem.

Member Avatar for peter_budo

Please post relevant post forwarding data in servlet and also ho do you retrieve them in the JSP.

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