I've already implemented the Introspector in logback-android:

• https://github.com/tony19/logback-android/blob/master/logback-core/src/main/java/ch/qos/logback/core/joran/util/Introspector.java
• https://github.com/tony19/logback-android/blob/master/logback-core/src/main/java/ch/qos/logback/core/joran/util/IntrospectionException.java
• https://github.com/tony19/logback-android/blob/master/logback-core/src/main/java/ch/qos/logback/core/joran/util/MethodDescriptor.java
• https://github.com/tony19/logback-android/blob/master/logback-core/src/main/java/ch/qos/logback/core/joran/util/PropertyDescriptor.java

This could be easily cherry-picked here.