StringBuilder addDnsIP(StringBuilder jvmArguments) {
		try {
			List<?> dnsServers = NetworkUtils.getDnsServers();
			if (!dnsServers.isEmpty()) {
				return jvmArguments.append(" -Dngrinder.dns.ip=").append(StringUtils.join(dnsServers, ",")).append(" ");
			}
		} catch (Exception e) {
			LOGGER.error("Error while adding DNS IPs for the security mode. This might be occurred by not using " +
					"Oracle JDK : {}", e.getMessage());
		}
		return jvmArguments;
	}
Rebase class path from relative path to absolute path.

@param classPath class path
@return converted path.
ngrinder-core/src/main/java/net/grinder/engine/agent/PropertyBuilder.java