ClassCircularityError

                                                         ClassCircularityError

If a class extends itself or an interface extends itself ClassCircularityError occur can occur

How can a class extends itself ?

Generally this does not happen . But is situation Where multiple version of same class exists in the library this kind of issue can occur

For example

in library Class Circular is available at two locations with different versions

com.org.online.Circular
com.org.offline.Circular

this classes are available in library defined for class Test.

So when Test class will be complied , ClassCircularityError might occur.


When is this error thrown?


java.lang.ClassCircularityError occurs when program overrides ClassLoader.loadClass and
call Class.getSimpleName().

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Exception stack trace generally comes like

Exception in thread "main" java.lang.ClassCircularityError: app/Class1$ChildClass
        at java.lang.Class.getDeclaringClass(Native Method)
        at java.lang.Class.getEnclosingClass(Class.java:1085)
        at java.lang.Class.getSimpleBinaryName(Class.java:1220)
        at java.lang.Class.getSimpleName(Class.java:1112)
        at server.ClassLoaderImpl.loadClass(ClassLoaderImpl.java:16)


Whhere does it fall in Error hierarchy?

Class ClassCircularityError   java.lang.Object
        java.lang.Throwable
            java.lang.Error
                java.lang.LinkageError
                    java.lang.ClassCircularityError





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