Thank you for your inquiry. If you use Aspose.Words for java pre 2.4 version then you also need sjsxp.jar and jsr173_1.0_api.jar - Sun StAX library. These JARs are used by html import/export modules. You can find these JARs in the same folder as Aspose.Words.jar.
But if you use Aspose.Words for java v2.4.0 and above then you don’t need any additional JARs.
Please tell me which version you are using.
You can download the latest version from here: