methodName=methodName.startsWith("is")? methodName.substring(2) : methodName;
// Pattern p=Pattern.compile("[A-Z]+");
Matcher m=METHOD_NAME_TO_ATTR_NAME_PATTERN.matcher(methodName);
StringBuffer sb=new StringBuffer();
while(m.find()) {
int start=m.start(), end=m.end();
String str=methodName.substring(start, end).toLowerCase();
if(str.length() > 1) {
String tmp1=str.substring(0, str.length() -1);
String tmp2=str.substring(str.length() -1);
str=tmp1 + "_" + tmp2;