EJCL is an advanced configuration library for Java with support for local files, MySQL databases, and more.
Below you can find information about how to use the library.
EJCL is also fully documented at ejcl.kaleko.dev/docs.
EJCL has two basic config types, structured and unstructured.
Structured configs are created with a Java class used as the "structure".
Calling config#get() will return an instance of the type passed to the constructor for easy use of the object.
Unstructured configs are not created with a defined "structure" and such can be used to store more dynamic data.
To get or set data on an unstructured config you can call config#get(path) or config#set(path, value) to do so (path can be any string and value can be any object).
EJCL also offers a variety of storage options listed below.
Configs can be stored locally on the filesystem using classes from the io.github.kale_ko.ejcl.file package.
This includes a SimpleFileConfig which is a config that stores key/value pairs in a very simple format, {key}={value}.
There is also BJSLFileConfig which is a config that stores data in different common formats (JSON, YAML, TOML, XML, CSV, Java Properties, and Json Smile)
Each of these different formats can be used by passing their respective parsers to the constructor {format}Parser
Configs can also be stored on a MySQL server using classes from the io.github.kale_ko.ejcl.mysql package.
The structured version is slower to load but can be easier to work with, while the unstructured version has the advantage of only fetching the data you need.
Note: The structured version only writes changed values to prevent overwriting others changes.
If you want you can also use EJCL to store a config in memory but there is not much point to this unless you are using an API that only accepts Config objects.
If you would like to contribute I will gladly accept any pull requests to the repo.