This is the manual for older MicroStream versions (Version < 5.0).
The new documentation (Version >= 5.0) is located at:
The EmbeddedStorageManager is mostly created with factory methods of EmbeddedStorage, where the most common settings, like database directory or the root instance, can be configured.
EmbeddedStorageManager storageManager = EmbeddedStorage.start(
myRoot, // root object of entity graph
Paths.get("data-dir") // storage data directory


To achieve a more detailed customization, you can utilize the EmbeddedStorageFoundation factory type. It holds and creates on demand all the parts that form an EmbeddedStorageManager.
NioFileSystem fileSystem = NioFileSystem.New();
EmbeddedStorageManager storageManager = EmbeddedStorageFoundation.New()

External Configuration

The artifact storage.embedded.configuration provides a convenience layer for configuration purposes, as well as facilities to read external configuration.
The Configuration type consolidates the most widely used parameters from the storage foundations in one place. It's output is an EmbeddedStorageFoundation from which a EmbeddedStorageManager can be created.
EmbeddedStorageManager storageManager = Configuration.Default()
To read an external configuration use ConfigurationLoader and ConfigurationParser or the Load*() methods of Configuration. Currently XML and INI files are supported.
java (xml)
java (ini)
Configuration configuration = Configuration.LoadXml(
<?xml version="1.0" encoding="UTF-8"?>
<property name="baseDirectory" value ="data" />
<property name="channelCount" value ="4" />
Configuration configuration = Configuration.LoadIni(
baseDirectory = data
channelCount = 4
If you just use Configuration.Load() the default configuration file is used, which is either a file in the classpath root named, or the path configured via the system property
The full example can be found on GitHub.
If you use a different format, e.g. Json, just implement the ConfigurationParser in the likes of XmlConfigurationParser or IniConfigurationParser.
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External Configuration