Re: [aspectj-users] Ambiguous methods with Java 8 (but not Java 7)

[Adam Retter <adam.retter@xxxxxxxxxxxxxx>]

>> Also, at present we compile our whole code-base with javac and then
>> use the Ant task to run iajc again over the whole codebase. I wonder
>> if we could just use iajc to compile those classes that actually have
>> Aspects? Perhaps that might work around all/some of the compile errors
>> we are getting?
>
> If you are rebuilding everything with iajc, that does seem a duplication of effort. You either should just build with iajc or build with javac and then binary weave the aspects into what you built with iajc. This latter approach would probably avoid this bug.  So javac your java modules. ajc your aspects and supply an inpath to that ajc call that is your javac built code, the output would be the woven form of that code.
>

Thanks Andy, I am trying to take your suggestion to restrict what is
compiled by AspectJ. We have one Aspect in our project called
PermissionRequiredAspect which allows us to annotate certain methods
within the codebase as needing a certain security context. Previously
our Ant compilation looked like this -

    <javac includeAntRuntime="false" debug="${build.debug}"
deprecation="${build.deprecation}" destdir="${build.classes}"
        encoding="UTF-8" optimize="${build.optimize}" srcdir="${src}"
        source="${build.compiler.source}" target="${build.compiler.target}"
        fork="true" memoryInitialSize="512m" memoryMaximumSize="1024m">

        <include name="org/**"/>

        <classpath>
            <path refid="classpath.core"/>
            <path refid="classpath.jetty"/>
            <path refid="classpath.aspectj"/>
        </classpath>
    </javac>

    <iajc debug="${build.debug}" deprecation="${build.deprecation}"
destdir="${build.classes}"
        encoding="UTF-8" srcdir="${src}"
        source="${build.compiler.source}" target="${build.compiler.target}"
        fork="true" maxmem="1024m" showWeaveInfo="true">

        <include name="org/**"/>

        <classpath>
            <path refid="classpath.aspectj"/>
            <path refid="classpath.core"/>
            <path refid="classpath.jetty"/>
        </classpath>
    </iajc>


Following your suggestion to reduce the amount of compilation done by
iajc, I have now modified the iajc task to this:

    <iajc debug="${build.debug}" deprecation="${build.deprecation}"
destdir="${build.classes}"
        encoding="UTF-8" srcdir="${src}"
        source="${build.compiler.source}" target="${build.compiler.target}"
        fork="true" maxmem="1024m" showWeaveInfo="true"
inpath="${build.classes}">

        <include name="org/exist/security/PermissionRequiredAspect.java"/>

        <classpath>
            <path refid="classpath.aspectj"/>
            <path refid="classpath.core"/>
            <path refid="classpath.jetty"/>
        </classpath>
    </iajc>


The good news is that the compilation now works with both Java 7 and
Java 8. The bad news however, is that at runtime when I try to use the
method of a class that was woven, I get this error message for
example:

 [junit] Caused by: java.lang.ClassFormatError: Duplicate field
name&signature in class file
org/exist/security/PermissionRequiredAspect
    [junit] at java.lang.ClassLoader.defineClass1(Native Method)
    [junit] at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
    [junit] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    [junit] at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
    [junit] at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
    [junit] at java.net.URLClassLoader$1.run(URLClassLoader.java:367)
    [junit] at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    [junit] at java.security.AccessController.doPrivileged(Native Method)
    [junit] at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
    [junit] at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    [junit] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    [junit] at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    [junit] at org.exist.security.UnixStylePermission.setMode(UnixStylePermission.java:237)
    [junit] at org.exist.collections.Collection.setPermissions(Collection.java:1917)

I guess there is something wrong with my compilation steps and that I
need to remove something from compilation at some stage? Can you
advise please?

My aspect is here
https://github.com/adamretter/exist/blob/aspectj-updates/src/org/exist/security/PermissionRequiredAspect.java
and an example of where that aspect is used (via the
PermissionRequired annotation is here) -
https://github.com/adamretter/exist/blob/aspectj-updates/src/org/exist/security/UnixStylePermission.java#L234

Thanks Adam.

-- 
Adam Retter

skype: adam.retter
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http://www.adamretter.org.uk