private Properties filterSystemClassPath(Properties properties, AbstractLanguageHandler handler, Logger logger) {
		String property = properties.getProperty("java.class.path", "");
		logger.debug("Total system class path in total is " + property);

		String newClassPath = handler.getClassPathProcessor().filterClassPath(property, logger);
		Properties returnProperties = new Properties(properties);
		returnProperties.setProperty("java.class.path", newClassPath);
		logger.debug("Filtered system class path is {}", newClassPath);
		return returnProperties;
	}
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