How do I use the new @BootstrapMethod annotation?

[Rémi Forax]

Le 12/11/2010 16:17, assembling signals a écrit :
> Hello!
>
> Sorry, but I seem not to understand the description of @BootstrapMethod javadoc.
>
> I declare a class with a static method (which returns a CallSite).
> The class from which InvokeDynamic is performed is annotated with the new annotation.
> Error is: java.lang.IllegalStateException: no bootstrap method found for invokedynamic.
>
> Please help!
>    

javac embeded in latest jdk7 beta binaries doesn't support @BootstrapMethod.

Rémi

> = = = = = = = = = =
> CODE
> = = = = = = = = = =
>
>
> import java.dyn.*;
>
> @BootstrapMethod(value = _InvokeDynamic.Bootstrap.class, name = "bootstrap")
> public class _InvokeDynamic {
>
>      public final static class Bootstrap {
>          public static CallSite bootstrap(Class<?>  declaring, String name, MethodType type) {
>              CallSite cs = new CallSite();
>              System.out.println(declaring + "." + name + " : " + type);
>              cs.setTarget(mhNormal);
>              return cs;
>          }
>      }
>
>      private final static MethodHandle mhNormal;
>
>      public static int staticMethod(int i1, int i2) {
>          return i1 + i2;
>      }
>
>      static {
>          try {
>              mhNormal = MethodHandles.lookup().findStatic(
>                      _InvokeDynamic.class, "staticMethod",
>                      MethodType.methodType(int.class, int.class, int.class));
>          } catch (Exception ex) {
>              throw new Error(ex);
>          }
>      }
>
>      private static void doDynSyntaxUsual()
>              throws Throwable {
>          int x;
>          x = (int) InvokeDynamic.ANY((int) -1, (int) +2);
>          System.out.println(x);
>      }
>
>      public static void main(String... args)
>              throws Throwable {
>          doDynSyntaxUsual();
>      }
>
> }
>
> = = = = = = = = = =
> OUTPUT
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> Exception in thread "main" java.lang.IllegalStateException: no bootstrap method found for invokedynamic
>          at _InvokeDynamic.doDynSyntaxUsual(_InvokeDynamic.java:40)
>          at _InvokeDynamic.main(_InvokeDynamic.java:46)
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