How to Retrieve all unread emails using javamail with POP3 protocol

This code will be work

Flags seen = new Flags(Flags.Flag.RECENT);
FlagTerm unseenFlagTerm = new FlagTerm(seen, false);
messages = inbox.search(unseenFlagTerm);

How to fix Plugin with id 'com.github.dcendents.android-maven' not found. in android studio

This is all depend your gradle version. please check https://github.com/dcendents/android-maven-gradle-plugin i found my solution in there.

 dependencies {
    // The gradle plugin and the maven plugin have to be updated after each version of Android
    // studio comes out
    classpath 'com.android.tools.build:gradle:3.1.1'
    classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5'
    classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.7.3'
}