private GrinderProperties createAndMergeProperties(GrinderProperties properties,
	                                                   GrinderProperties startMessageProperties) throws PersistenceException {

		if (startMessageProperties != null) {
			properties.putAll(startMessageProperties);
		}
		return properties;
	}
Filter classpath to prevent too many instrumentation.

@param properties system properties
@param handler    Language specific handler
@param logger     logger
@return new filtered properties
ngrinder-core/src/main/java/net/grinder/engine/agent/AgentImplementationEx.java