I am using aspose-page-25.12.jar and following your example code, to convert ps file to pdf. But I got the below issue on some files:
Cannot invoke “com.aspose.page.internal.l1l.I594.equals(Object)” because “” is null
…...eps.PsDocument.ll(Unknown Source) at com.aspose.eps.PsDocument...aspose.eps.PsDocument.lif(Unknown Source) at com.aspose.eps.PsDocument...