liquibase-core/src/main/java/liquibase/configuration/LiquibaseConfiguration.java
public <T extends ConfigurationContainer> T getConfiguration(Class<T> type) {
        if (!configurations.containsKey(type)) {
            configurations.put(type, createConfiguration(type));
        }

        return (T) configurations.get(type);
    }
public <T extends ConfigurationContainer> T getConfiguration(Class<T> type) {
        if (!configurations.containsKey(type)) {
            configurations.put(type, createConfiguration(type));
        }

        return (T) configurations.get(type);
    }
Return an instance of the passed AbstractConfigurationContainer type.
The same instance is returned from every call to getConfiguration()