A functional Java library for Messenger API (unofficial) example:
Are you trying to install Messenger on an old mobile phone, or are you looking for a Java library to write your own software? facebook messenger java application download
These files can contain keyloggers or send your credentials to third parties. Always prefer the official mobile website. A functional Java library for Messenger API (unofficial)
If you are looking for a (typically .jar or .jad files) for older feature phones, you should be extremely cautious. Official support for Java (J2ME) versions of Facebook Messenger ended many years ago. Review of Java-Based Messenger Downloads facebook messenger java application download