WordUtils.getInstance(basicSet).word2html();
basicSet can not be loaded for the second time because it is singleton. e.g.
// first time call
basicSet with doc fileA.docx to html fileA.html
WordUtils.getInstance(basicSet).word2html();
// success
// then delete fileA.docx and fileA.html
// second time call
basicSet with doc fileB.docx to html fileB.html
WordUtils.getInstance(basicSet).word2html();
// failed.
WordUtils.getInstance(basicSet).word2html();
basicSet can not be loaded for the second time because it is singleton. e.g.