jodd-props/src/main/java/jodd/props/Props.java
public Props loadSystemProperties(final String prefix) {
		final Properties environmentProperties = System.getProperties();
		load(environmentProperties, prefix);
		return this;
	}
public Props loadSystemProperties(final String prefix) {
		final Properties environmentProperties = System.getProperties();
		load(environmentProperties, prefix);
		return this;
	}
Loads system properties with given prefix.
If prefix is <code>null</code> it will not be ignored.