Arthur API

Arthur API enables you to mark in your code some Graal metainformation. Under the hood it just uses a meta-extension linked to this specific API.

For more information about extensions, see SPI documentation.

Dependencies

<dependency>
  <groupId>org.apache.geronimo.arthur</groupId>
  <artifactId>arthur-api</artifactId>
  <version>${arthur.version}</version>
</dependency>

Usage

@Register* annotation enables to register reflection and resources on your classes directly.

Example:

@RegisterClass(all = true) (1)
public class All {
    private String name;

    public All() {
        // no-op
    }

    public All(final String name) {
        this.name = name;
    }

    public boolean isAll() {
        return true;
    }
}

1	will register the public constructors, fields and methods as available in the native image.

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Custom annotation marker

You can set extension.annotation.custom.annotations.class to a list of custom annotations set on classes to replace RegisterClass. Exact configuration value follows this pattern: <custom annotation fully qualified name>[:[<RegisterClass attribute>=value]|*]?. A common example is: com.foo.MyAnnot1:all=true,com.foo.MyAnnot2:allPublicMethods=true|allPublicFields=true.

Similarly extension.annotation.custom.annotations.properties enables to configure the same thing but to find classes from marked fields or methods. It is very common with unmanaged @ConfigProperty classes for example.