I have searched Getjar but couldn’t find any worthwhile j2me app for PDF & ePub ebooks. I must tell you my mobile has NOT Symbian OS, it only supports java (j2me) apps.
Here is a free ebook conversion tool for you.
You can easily convert your ebook from epub to pdf.
Free Online Ebook Converter
It provides you with the best PDF to ePub converting experience.
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Anyview is by far the best reader for Java mobiles.
Albite can be used to read various formats. Link: albite.org/reader
The best suggestion I can give you are:
For PDF books > Adobe Reader
For ePub books > Albite Reader
I suggest you also search in this site: http://www.mobile9.com/
Choose your phone model, and search for the programs I said. And if you don't find them, search for others.. Maybe you find a better solution!
Hope it helped!
perhaps conversion is needed to be opened on your phone with a reader
Albite - Free Java eBook Reader With Touch and ePub Support