How to Iterate an Arraylist Inside a Hashmap Using Jstl

How to iterate an ArrayList inside a HashMap using JSTL?

You can use JSTL <c:forEach> tag to iterate over arrays, collections and maps.

In case of arrays and collections, every iteration the var will give you just the currently iterated item right away.

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<c:forEach items="${collectionOrArray}" var="item">
    Item = ${item}<br>
</c:forEach>

In case of maps, every iteration the var will give you a Map.Entry object which in turn has getKey() and getValue() methods.

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<c:forEach items="${map}" var="entry">
    Key = ${entry.key}, value = ${entry.value}<br>
</c:forEach>

In your particular case, the ${entry.value} is actually a List, thus you need to iterate over it as well:

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<c:forEach items="${map}" var="entry">
    Key = ${entry.key}, values = 
    <c:forEach items="${entry.value}" var="item" varStatus="loop">
        ${item} ${!loop.last ? ', ' : ''}
    </c:forEach><br>
</c:forEach>

The varStatus is there just for convenience ;)

To understand better what's all going on here, here's a plain Java translation:

for (Entry<String, List<Object>> entry : map.entrySet()) {
    out.print("Key = " + entry.getKey() + ", values = ");
    for (Iterator<Object> iter = entry.getValue().iterator(); iter.hasNext();) {
        Object item = iter.next();
        out.print(item + (iter.hasNext() ? ", " : ""));
    }
    out.println();
}

How to iterate ArrayList HashMap String, String in a jsp page using JSTL

There are few things you have to change:

ResultSet are by-default forward only, since your accessing column Stk_prdid multiple time , it does not returns any value.

public ArrayList getAllStockDetails() {
    ...
    Statement stmt = dcon.con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
    ....
    while (rs.next()) {
        HashMap<String, String> stkMap = new HashMap<String, String>();//<-- move here
        stkList.add(stkMap);
        ...
    }
    ....
}

In jsp:

...
<c:forEach var="row" items="${stkList}">
    ...
    <td>${row.prdStk}</td>
    ...
...

Iterating through an arraylist in a hashmap based on key in JSTL

Please try to use

instead if

Iterate the Hashmap/ArrayList using JSTL

Assuming your ${xml} contains the array attribute of request/session:

You're trying to read the entries of the Maps directly. You should start reading the elements from the list that are Maps.

From How to iterate an ArrayList inside a HashMap using JSTL?, you're using the wrong syntax to access the current entry values of your map. You should use entry.value in your code:

<table border="1">
    <c:forEach items="${xml}" var="itemMap">
        <c:forEach items="${itemMap}" var="mapEntry">
        <tr>
            <td>
                <c:choose>
                    <c:when test="${mapEntry.key == 'name'}">
                        <c:out value="Name:" />
                    </c:when>
                    <c:when test="${mapEntry.key == 'catVal'}">
                        <c:out value="Cat value:" />
                    </c:when>
                    <c:when test="${mapEntry.key == 'catStat'}">
                        <c:out value="Cat status:" /> 
                    </c:when>
                </c:choose>
            </td>
            <td>
                ${mapEntry.value}
            </td>
        </tr>
        </c:forEach>
    </c:forEach>
</table>

How to iterate over a list of objects which have a map as a field in jstl?

I think you have to iterate map (the field map of the class Spravochnik) too.
Maybe like that:

 <c:forEach var="sprav" items="${spravList}">
        <tr>
            <td>
                ${sprav.id}
            </td>
            <td>
                <c:forEach items="${sprav.map}" var="entry">
                  Key = ${entry.key}, value = ${entry.value}<br>
                </c:forEach> 
            </td>
        </tr>
    </c:forEach>

Key and Value has ArrayList in Map by Using JSTL

I am not sure, but maybe you want something like this:

<%
Map<String, List<String>> myMap = new LinkedHashMap<String,List<String>>();
request.setAttribute("mainMenu", myMap);
List<String> adminItemsList = new ArrayList<String>();
adminItemsList.add("User Creation");
adminItemsList.add("Branch Creation");

List<String> lookupItemsList = new ArrayList<String>();
lookupItemsList.add("Country");
lookupItemsList.add("Language");

myMap.put("Administrator", adminItemsList);
myMap.put("Lookup Configuration", lookupItemsList);
%>

<c:forEach items="${mainMenu}" var="myMenu">
    <li id="lookup" class="mail"><a href="#lookup">${myMenu.key}<span>26</span></a>   
    <ul class="sub-menu">
    <c:forEach items="${myMenu.value}" var="item" varStatus="loop">
         <li><a href="#"><em>02</em>_${item}_<span>14</span></a></li>
    </c:forEach>                                            
    </ul>                   
    </li>
</c:forEach>

out:

Administrator26

02_User Creation_14
02_Branch Creation_14

Lookup Configuration26

02_Country_14
02_Language_14

I used LinkedHashMap to remember order of keys i putted in Map.

How to iterate HashMap using JSTL forEach loop?

Try this,

suppose my MAP is :-

Map<String, String> countryList = new HashMap<String, String>();
countryList.put("United States", "Washington DC");
countryList.put("India", "Delhi");
countryList.put("Germany", "Berlin");
countryList.put("France", "Paris");
countryList.put("Italy", "Rome");

request.setAttribute("capitalList", countryList);

So in JSP ,

<c:forEach var="country" items="${capitalList}">
    Country: ${country.key}  - Capital: ${country.value}
</c:forEach>

Hope this helps !

How to Iterate an Arraylist Inside a Hashmap Using Jstl