Exclude	Marks a field as excluded from the Database.
IgnoreExtraProperties	Properties that don't map to class fields are ignored when serializing to a class annotated with this annotation.
PropertyName	Marks a field to be renamed when serialized.
ThrowOnExtraProperties	Properties that don't map to class fields when serializing to a class annotated with this annotation cause an exception to be thrown.

ChildEventListener	Classes implementing this interface can be used to receive events about changes in the child locations of a given `DatabaseReference` ref.
DatabaseReference.CompletionListener	This interface is used as a method of being notified when an operation has been acknowledged by the Database servers and can be considered complete
Transaction.Handler	An object implementing this interface is used to run a transaction, and will be notified of the results of the transaction.
ValueEventListener	Classes implementing this interface can be used to receive events about data changes at a location.

DatabaseError	Instances of DatabaseError are passed to callbacks when an operation failed.
DatabaseReference	A Firebase reference represents a particular location in your Database and can be used for reading or writing data to that Database location.
DataSnapshot	A DataSnapshot instance contains data from a Firebase Database location.
FirebaseDatabase	The entry point for accessing a Firebase Database.
GenericTypeIndicator<T>	Due to the way that Java implements generics (type-erasure), it is necessary to use a slightly more complicated method to properly resolve types for generic collections at runtime.
MutableData	Instances of this class encapsulate the data and priority at a location.
OnDisconnect	The OnDisconnect class is used to manage operations that will be run on the server when this client disconnects.
Query	The Query class (and its subclass, `DatabaseReference`) are used for reading data.
ServerValue	Contains placeholder values to use when writing data to the Firebase Database.
Transaction	The Transaction class encapsulates the functionality needed to perform a transaction on the data at a location.
Transaction.Result	Instances of this class represent the desired outcome of a single run of a `Transaction.Handler`'s doTransaction method.

DatabaseException This error is thrown when the Firebase Database library is unable to operate on the input it has been given.

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