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From "Emmanuel Bourg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BCEL-174) Verification of interfaces with default methods fails with Java 8
Date Wed, 23 Apr 2014 11:08:19 GMT

    [ https://issues.apache.org/jira/browse/BCEL-174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13978072#comment-13978072
] 

Emmanuel Bourg commented on BCEL-174:
-------------------------------------

There are two issues here:
- The error message is wrong, the missing modifier on the default methods is {{ACC_ABSTRACT}}
and not {{ACC_STATIC}}
- default methods in Java 8 are obviously not abstract, so this rule doesn't apply to the
class format 52 and above.

Here is the relevant part of the specification:

http://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.6

{quote}Methods of interfaces may have any of the flags in Table 4.6-A set except ACC_PROTECTED,
ACC_FINAL, ACC_SYNCHRONIZED, and ACC_NATIVE (JLS ยง9.4). In a class file whose version number
is less than 52.0, each method of an interface must have its ACC_PUBLIC and ACC_ABSTRACT flags
set; in a class file whose version number is 52.0 or above, each method of an interface must
have exactly one of its ACC_PUBLIC and ACC_PRIVATE flags set.{quote}


> Verification of interfaces with default methods fails with Java 8
> -----------------------------------------------------------------
>
>                 Key: BCEL-174
>                 URL: https://issues.apache.org/jira/browse/BCEL-174
>             Project: Commons BCEL
>          Issue Type: Bug
>    Affects Versions: 5.2
>            Reporter: Emmanuel Bourg
>             Fix For: 6.0
>
>
> With Java 8 the verifier fails to validate interfaces containing default methods. For
example with the Collection interface it returns this error:
> {code}Interface method 'public boolean removeIf(java.util.function.Predicate arg1) [Signature((Ljava/util/function/Predicate<-TE;>;)Z)]'
must have the ACC_STATIC modifier set but hasn't!{code}



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