more band aid coming - Object methods on 'any' tvars

[Richard Warburton]

Hi,

Actually it appears to be that you can't call the object method on any
expression that's more complex that referencing a variable. Eg:

    public static <any T> void fail(T[] values) {
        get(values).toString();
    }

    public static <any T> T get(T[] values) {
        return values[0];
    }

Also NPEs.


On Sat, Jan 17, 2015 at 12:36 PM, Richard Warburton <
richard.warburton at gmail.com> wrote:

> Hi Maurizio,
>
> I think I've found a bug here. You can't call the object methods on
> anyified arrays. Here's a minimal test case and stack trace:
>
>     public static <any T> void fail(T[] values) {
>         values[0].toString();
>     }
>
> Workaround:
>
>     public static <any T> void fail(T[] values) {
>         T value = values[0];
>         value.toString();
>     }
>
> Javac stacktrace:
>
> java.lang.NullPointerException
>         at com.sun.tools.javac.comp.Attr.selectSym(Attr.java:3433)
>         at com.sun.tools.javac.comp.Attr.selectSym(Attr.java:3420)
>         at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3258)
>         at
> com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:2082)
>         at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:543)
>         at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1800)
>         at
> com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1608)
>         at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:543)
>         at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:589)
>         at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1568)
>         at
> com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1426)
>         at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:543)
>         at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:609)
>         at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:625)
>         at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1112)
>         at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:994)
>         at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:543)
>         at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:609)
>         at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:997)
>         at
> com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:843)
>         at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:543)
>         at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:609)
>         at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4404)
>         at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4312)
>         at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4234)
>         at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4209)
>         at
> com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1230)
>         at
> com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:872)
>         at com.sun.tools.javac.main.Main.compile(Main.java:249)
>         at com.sun.tools.javac.main.Main.compile(Main.java:140)
>         at com.sun.tools.javac.Main.compile(Main.java:56)
>         at com.sun.tools.javac.Main.main(Main.java:42)
>
> regards,
>
>   Richard Warburton
>
>   http://insightfullogic.com
>   @RichardWarburto <http://twitter.com/richardwarburto>
>



-- 
regards,

  Richard Warburton

  http://insightfullogic.com
  @RichardWarburto <http://twitter.com/richardwarburto>