CODEWITHSUNDEEP
jspstruts2ognl
Mike
Mike

Reputation: 1610

Keep getting the OgnlException: source is null for getProperty(null, "0") Warning

Ok. So I am using the below JSP and Java code to access the notMessageFieldList. It works fine, however, I keep getting a OgnlException: source is null for getProperty(null, "0") warning when I leave the page. It seems that Struts 2 is trying to get null values and triggers this warning. Is there any way to get rid of it without adjusting my Tomcat settings?

JSP:

        <s:iterator var="counter" begin="0" end="3">
        <tr>
            <th style="font-size: 120%; font-weight: 900; color: red;">X</th>
            <td style="font-size: 80%;">NEW</td>
        </tr>
        <tr>
            <td><b>Field Name:</b>&nbsp;
            </td>
            <td style="float: left">
                <s:textfield
                        name="notMessageFieldList[%{counter}].tag"
                        size="47">
                </s:textfield>
            </td>
        </tr>
        <tr>
            <td><b>Description:</b>&nbsp;
            </td>
            <td style="float: left">
                <s:textfield
                        name="notMessageFieldList[%{counter}].description"
                        size="47">
                </s:textfield>
            </td>
        </tr>
        <tr>
            <td><b>Data Type:</b>&nbsp;
            </td>
            <td style="float: left">
                <s:select
                        list="validDataTypes"
                        name="notMessageFieldList[%{counter}].dataType"
                        key="dataType.required"/>
            </td>
        </tr>
        </s:iterator>

JAVA ACTION:

private List<NotificationMessageField> notMessageFieldList = new ArrayList<>(4);

public List<NotificationMessageField> getNotMessageFieldList() {
        return notMessageFieldList;
    }

public void setNotMessageFieldList(@Nullable final List<NotificationMessageField> notMessageFieldList) {
    if (CollectionUtils.isNotEmptyList(notMessageFieldList)) {
        this.notMessageFieldList.clear();
        this.notMessageFieldList = new ArrayList<>(notMessageFieldList);
    } else {
        this.notMessageFieldList = new ArrayList<>(5);
    }
}

JAVA POJO (Assume regular set up, getters/setters):

public NotificationMessageField(final String tag, final String description, final String dataType) {
    this.tag = tag;
    this.description = description;
    this.dataType = dataType;
}

Upvotes: 1

Views: 2934

Answers (1)

Roman C
Roman C

Reputation: 1

Add the value attribute to textfields. It will preset textfields with the initial value and once the value is preset it won't be evaluated by the name. 

<s:textfield name="notMessageFieldList[%{counter}].tag" size="47" value="">

Upvotes: 1

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