ERROR: application/pdf is not a supported mime type [duplicate]

Question

This question is an exact duplicate of:

• File is not downloading from server 3 answers

I am using Struts2 and Liferay for developing an application.

My struts.xml is as follows:

<action name="download" class="com.stp.portal.view.DownloadAction">
    <result name="success" type="stream">
        <param name="contentType">application/pdf</param>
        <param name="inputName">fileInputStream</param>
        <param name="contentDisposition">attachment;filename="abc.pdf"</param>
        <param name="bufferSize">1024</param>
    </result>
</action>

I basically want to download a pdf file from the server. But I get the following error:

10:05:55,782 ERROR [Jsr168Dispatcher:38] Could not execute action java.lang.IllegalArgumentException: application/pdf is not a supported mime type at com.liferay.portlet.MimeResponseImpl.setContentType(MimeResponseImpl.java:159)...

Don't know how to resolve this. Would really appreciate someone's help. Really need this to be done.

Answer 1

Looking at the source code seems like only application/vnd.wap.xhtml+xml and text/html are allowed.
Source: http://grepcode.com/file/repo1.maven.org/maven2/com.liferay.portal/portal-impl/6.0.2/com/liferay/portlet/MimeResponseImpl.java

Answer 2

Put portletUrlType="resource" to the <s:url> tag which you use to create download link.

<s:url var="downloadUrl" action="download" portletUrlType="resource" />