Whatsapp Java J2me -

J2ME lacked a relational database. WhatsApp used RMS with:

As of 2025 and early 2026, unofficial J2ME clients have emerged (often referred to as "Novel Messenger" or similar projects). These third-party apps allow legacy phones, such as Symbian S60 and BlackBerry OS devices, to connect to WhatsApp again by using a custom server-side relay. Technical Overview of Unofficial Clients Architecture Whatsapp java j2me

But by , things had changed:

Do you need for J2ME socket networking or UI forms? J2ME lacked a relational database