Properties () { Properties res = ourSystemProperties; if (res == null) { res = new Properties(); res.putAll(System.getProperties()); for (Iterator<Object> itr = res.keySet().iterator(); itr.hasNext(); ) { final String propertyName = itr.next().toString(); if (propertyName.startsWith("idea.") || propertyName.startsWith("jps.")) { itr.remove(); } } for (Map.Entry<String, String> entry : System.getenv().entrySet()) { String key = entry.getKey(); if (key.startsWith("=")) { continue; } if (SystemInfo.isWindows) { key = StringUtil.toUpperCase(key); } res.setProperty("env." + key, entry.getValue()); } ourSystemProperties = res; } return res; }