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@Override
    public com.liferay.document.library.kernel.model.DLFileEntry addFileEntry(long userId, long groupId,
            long repositoryId, long folderId, String sourceFileName, String mimeType, String title, String description,
            String changeLog, long fileEntryTypeId,
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;java.util.Map<string, com.liferay.dynamic.data.mapping.kernel.ddmformvalues> ddmFormValuesMap,
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;java.io.File file, java.io.InputStream is, long size,
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;com.liferay.portal.kernel.service.ServiceContext serviceContext)
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;throws com.liferay.portal.kernel.exception.PortalException {
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;if(isOcrCompliantUpload(PropsUtil.get(OCR_MATCH_STRING),PropsUtil.get(OCR_WORK_DIR),sourceFileName)) {
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;return super.addFileEntry(userId, groupId, repositoryId, folderId, sourceFileName, mimeType, title, description, changeLog, fileEntryTypeId, ddmFormValuesMap, file, is, size, serviceContext);
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;}else {
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;return null; --&gt; this is erroneous for me , i want to know what should be the return type in this case , it shouldnt be null ?
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;}
&nbsp;&nbsp; &nbsp;}</string,>

Is this abbreviated? I'm wondering why

isOcrCompliantUpload

doesn't reference the file or inputStream parameter, and what would be OCR'ed in that case.
But if you deny creating that file, and don't create any file in the backend, you can't create and return an "empty" document (as that would create a document, which you don't want). Thus null seems fine to me.

However: Liferay also uploads images for use in illustrating your web content to the Document Library. Make sure that you don't deny their upload. You may want to apply the described limitation to a specific site or folder. Which brings me to an alternative method: You can also implement this functionality as a workflow, with a scripted approval step that would decouple the OCR process from the upload itself, providing the opportunity to manually override if necessary.