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https://issues.apache.org/jira/browse/LANG-1765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17937418#comment-17937418
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Gary D. Gregory commented on LANG-1765:
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Hello [~sustech-whl]
Your example reflects the behavior documented in the Javadoc in git master.
In 3.17.0, the Javadoc was not updated to document the behavior to match the
code.
HTH.
> when using FieldUtils.readDeclaredStaticField throw a NullPointerException
> --------------------------------------------------------------------------
>
> Key: LANG-1765
> URL: https://issues.apache.org/jira/browse/LANG-1765
> Project: Commons Lang
> Issue Type: Bug
> Components: lang.*
> Affects Versions: 3.17.0
> Reporter: Wang Hailong
> Priority: Major
>
> The mimal test case is like that:
> {color:#cc7832}class {color}ChildClass
> {
> static String fieldName{color:#cc7832};
> }{color}
> @org.junit.jupiter.api.Test // Corrected annotation usage
> public void testReadStaticFieldAcrossInheritance() throws Exception {
> // Data Preparation
> Class<?> cls = ChildClass.class;
> Field field = cls.getDeclaredField("fieldName");
> field.setAccessible(true);
> // API Invocation
> Object value = FieldUtils.readDeclaredStaticField(cls, "fieldName");
> }
> And it just throw a nullpointerException
> And I find out why it could happen:
> in the method : getDeclaredField
> try {
> Field field = cls.getDeclaredField(fieldName);
> if (!MemberUtils.isAccessible(field)) {
> if (!forceAccess) {
> return null;
> }
> field.setAccessible(true);
> }
> The method "MemberUtils.isAccessible(field)" it can not recognize that I
> have set the filed to be accessible by java reflection. So it just return
> null and the it will throw a nullPointerException
>
>
>
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