JSP with Struts2 form throws Null Pointer on load

I have a .jsp file with the following form:

 <s:form action="addnews" method="post" cssClass="form" enctype="multipart/form-data">
            <s:file name="upload" required="required" />
            <s:textfield name="title" cssClass="form-control" placeholder="Başlık" required="required" />
            <s:select name="language" list="{'TR', 'RO', 'RO'}" cssClass="form-control" />
            <s:textarea name="text" />
            <s:submit cssClass="btn btn-default" style="margin-top: 20px;" value="Gonder" />
 </s:form>

This is my struts.xml:

    <action name="newsform" class="panelAction" method="loadForm">
        <result name="success">/pages/turkish/authenticated/newsform.jsp</result>
    </action>

    <action name="addnews" class="newsAction" method="createNews">
        <result name="success">/pages/turkish/authenticated/success.jsp</result>
        <result name="input">/pages/turkish/authenticated/newsform.jsp</result>
    </action>

The newsform action is used to display a JSP with a form. Then, addnews action collects the input data and adds a news.

My problem is that the newsform action calls the addnews action without waiting the user to press the submit button, consequently, a null pointer is thrown. How can I tell struts to wait for the user input, then submit my form?

Thank you