PropertyUtils.getProperty(bean,name)出现的问题

public calss Point {
    private Double xPoint;
    private Double yPoint;
    getter  and setter ....

   public static void main(String... args) {
    Point p = new Point();
    p.setXPoint(12.3);
    PropertyUtils.getProperty(p, "xPoint");
}
}

报错
Exception in thread "main" java.lang.NoSuchMethodException: Unknown property 'xPoint'
at org.apache.commons.beanutils.PropertyUtils.getSimpleProperty(PropertyUtils.java:1175)
at org.apache.commons.beanutils.PropertyUtils.getNestedProperty(PropertyUtils.java:772)
at org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.java:801)

当属性换用 xxPoint时便不报错。跟踪测试时发现反射得到的属性是 XPoint， 而非xPoint,这是怎么回事呢？

经查证实是commons-beanutils自身bug

https://issues.apache.org/jira/browse/BEANUTILS-30

https://issues.apache.org/jira/browse/BEANUTILS-323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12613904#action_12613904