ReferencesSearch.search return empty

I am having a problem with ReferencesSearch.search().  What I am doing is customing the Find Usages. I want to find where the Integer's valueOf method had been  referenced in my project, below is my code:

public void actionPerformed(AnActionEvent e) {
    // TODO: insert action logic here
    Project project = e.getData(PlatformDataKeys.PROJECT);

    JavaPsiFacade javaPsiFacade = JavaPsiFacade.getInstance(project);
    PsiClass aClass = javaPsiFacade.findClass("java.lang.Integer", GlobalSearchScope.allScope(project));
    PsiMethod[] valueOVES = aClass.findMethodsByName("valueOf", false);

    for (int i = 0; i < valueOVES.length; i++) {
        Query<PsiReference> search = ReferencesSearch.search(valueOVES[i], GlobalSearchScope.projectScope(project), false);
        Collection<PsiReference> all = search.findAll();
    }
}

The valueOVES's size is three, that's correct, But the all's size is 0.

And below is my test file JavaClass:

public class JavaClass {
    class TestJava{
        JavaClass javaClass;
        public TestJava( ){
            this.javaClass = new JavaClass();
            Integer.valueOf("1223");
            Integer.valueOf("1223");
            Integer.valueOf("1223");
            Integer.valueOf("1223");
            Integer.valueOf("1223");
            Integer.valueOf("1223");
        }
    }
}

Please help me, Thanks in advance!!

I have read https://intellij-support.jetbrains.com/hc/en-us/community/posts/206754855-ReferencesSearch-findAll-returns-Empty-Collection  and  https://intellij-support.jetbrains.com/hc/en-us/community/posts/207303915-Reference-Search-returning-empty-collection?input_string=ReferencesSearch.search%20return%20empty 

But I can't get help from these reports. I am new to this. Can someone give me some documents or links? Thanks!