remove all the items in jstl foreach on button click spring - sql

Question

I have created a search query to filter records from the database. Whenever I enter the value I want to filter for eg the email as a criteria and click on search, it retrieves the record from the database, if I click on search again instead of adding the new search result it repopulate the list with the new records and keeping the old record in view.
editted
this is adminList initialization
List<Admin> adminList = new ArrayList<Admin>();
this is the query I am using to search
#SuppressWarnings("unchecked")
public List<Admin> getAllAdmins(String singleAdmin) {
try{
String query = "SELECT DISTINCT e.* FROM admin e WHERE e.email like '%"+ singleAdmin +"%'";
List<Object[]> adminObjects = fetchAll(query);
for(Object[] adminObject: adminObjects) {
Admin adminIndividual = new Admin();
Integer id = ((Integer) adminObject[0]);
String email = (String) adminObject[1];
String name = (String) adminObject[2];
adminIndividual.setId(id);
adminIndividual.setEmail(email);
adminIndividual.setName(name);
adminList.add(adminIndividual);
}
System.out.println("database values for admin>>>>> "+adminList);
return adminList;
}catch(Exception e){
e.printStackTrace();
return null;
}
}
this is the snippet of code in my .jsp file that send the data to the controller to make a search for the query criteria
<form method="post" action="searchAdmin">
<p><label for="name">Admin Email</label>
<input class="form-control" type='text' name='searchName' id='searchName'/>
<input class="btn btn-success" type='submit' value='RETRIEVE'/>
</p>
this is how I am populating the list that gets the values whenever a new search is made
<c:forEach items="${adminList}" var="admin">
<p>
<label for="name">FULLNAME</label>
<input type="text" name="name" placeholder="" value="${admin.name}" readonly/>
</p>
<p>
<label for="email">Email</label>
<input type="text" name="email" placeholder="" value="${admin.email}" readonly/>
</p>
</c:forEach>
you can see the fullname repeating twice and if I enter an email again to click on search, it doubles to three retaining the two previous records. Please how do I tackle this issue whenever I try to search, as the page refreshes let is populates the search query with out repeating with the previous search query. Kindly assist!