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= 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 link:spi.html[SPI] documentation.
== Dependencies
[source,xml]
----
<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:
[source,java]
----
@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.
---
Previous: link:documentation.html[Documentation] Next: link:spi.html[Arthur SPI]
== 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.