Properties props = new Properties();
props.addProperty("database.max_background_compactions", "2");
props.addProperty("data.write_buffer_size", "512MB");

Properties props = new Properties();
props.put("database.max_background_compactions", "2");
props.put("data.write_buffer_size", "512MB");

<property name="database.max_background_compactions" value="2"/>
<property name="data.write_buffer_size" value="512MB"/>

<property name="database.max_background_compactions">2</property>
<property name="data.write_buffer_size">512MB</property>