How to build jar files from source?

mmjvox

im trying to build JAR files for android placed in (only java files without cpp files):

src/qtbase/src/android/jar/

when i'm going to build jar.pro file that exists in current directory (sdk and jdk are defined in path and qtcreator's settings and they are working) i face this error:

Src/qtbase/src/android/jar/src/org/qtproject/qt5/android/QtActivityDelegate.java:881: error: cannot find symbol
        if (Build.VERSION.SDK_INT < 24 || !m_activity.isInMultiWindowMode())
                                                     ^
  symbol:   method isInMultiWindowMode()
  location: variable m_activity of type Activity
Note: Src/qtbase/src/android/jar/src/org/qtproject/qt5/android/QtMessageDialogHelper.java uses or overrides a deprecated API.

What is the correct method to build only jar files?

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How to build jar files from source?