how to display data obtained from dao in jsp

Answer 1

I spot several mistakes:

Here,

<c:forEach items="${resultList}" var="resultList"> 

You're overriding the list value with the value of the list item everytime. Don't do that. Give the var an unique variable name. The entity name is the most straightforward choice.

<c:forEach items="${resultList}" var="project"> 

Note that I'd personally also rename the nothing-saying resultList to a more self-explaining projects.

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And here,

<tr class="bg-row1">
    <c:forEach items="${resultList}" var="project"> 

the flow is wrong. You should print a new row inside each loop. Swap them.

<c:forEach items="${resultList}" var="project"> 
    <tr class="bg-row1">

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And here,

${resultList.Projid}
${resultList.Projname}
${resultList.Cost}
${resultList.Manager}

the property names must start with lowercase (and fix the item name to be the same as in var).

${project.projid}
${project.projname}
${project.cost}
${project.manager}

Note that I'd personally also get rid of proj prefix in some property names.

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And finally you're forgotten a closing </c:forEach>.

    </tr>
</c:forEach>

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Unrelated to the concrete problem, your JDBC code is sensitive to SQL injection attacks and is leaking resources. Fix it as well.