Tips for writing native applications

    public class Person {
        private String first;
        private String last;

        public String getFirst() {
            return first;
        }

        public void setFirst(String first) {
            this.first = first;
        }

        public String getLast() {
            return last;
        }

        public void setValue(String last) {
            this.last = last;
        }
    }

    @Path("/person")
    @Produces(MediaType.APPLICATION_JSON)
    @Consumes(MediaType.APPLICATION_JSON)
    public class PersonResource {

        private final Jsonb jsonb;

        public PersonResource() {
            jsonb = JsonbBuilder.create(new JsonbConfig());
        }

        @GET
        public Response list() {
            return Response.ok(jsonb.fromJson("{\"first\":  \"foo\", \"last\":  \"bar\"}", Person.class)).build();
        }
    }

Exception handling request to /person: org.jboss.resteasy.spi.UnhandledException: jakarta.json.bind.JsonbException: Can't create instance of a class: class org.acme.jsonb.Person, No default constructor found

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.acme.jsonb.Person and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS)

@RegisterForProxy
public interface MyInterface extends MySecondInterface {
}

@RegisterForProxy(targets={MyInterface.class, MySecondInterface.class})
public class MyReflectionConfiguration {
}

@RegisterResourceBundle(bundleName = "messages")
@RegisterResourceBundle(bundleName = "errors", moduleName = "foo")
public class NativeConfiguration {
}

@RegisterResources(globs = ["path1/level*/**", "path2/level5/**"])
@RegisterResources(globs = ["**.txt"])
public class NativeConfiguration {
}

Error: No instances are allowed in the image heap for a class that is initialized or reinitialized at image runtime: sun.security.provider.NativePRNG
Trace: object java.security.SecureRandom
method com.amazonaws.services.s3.model.CryptoConfiguration.<init>(CryptoMode)
Call path from entry point to com.amazonaws.services.s3.model.CryptoConfiguration.<init>(CryptoMode):

Error: com.oracle.graal.pointsto.constraints.UnsupportedFeatureException: Detected an instance of Random/SplittableRandom class in the image heap. Instances created during image generation have cached seed values and don't behave as expected.

com.oracle.svm.core.jdk.UnsupportedFeatureError: Proxy class defined by interfaces [interface org.apache.http.conn.HttpClientConnectionManager, interface org.apache.http.pool.ConnPoolControl, interface com.amazonaws.http.conn.Wrapped] not found. Generating proxy classes at runtime is not supported. Proxy classes need to be defined at image build time by specifying the list of interfaces that they implement.

@Path("/singletons")
public class Singletons {

    @GET
    @Path("/static")
    public long withStatic() {
        return StaticSingleton.startTime();
    }
}

class StaticSingleton {
    static final long START_TIME = System.currentTimeMillis();

    static long startTime() {
        return START_TIME;
    }
}

$ curl http://localhost:8080/singletons/static
1656509254532%

$ curl http://localhost:8080/singletons/static
1656509254532%

### Restart the native application ###

$ curl http://localhost:8080/singletons/static
1656509254532%

@Path("/singletons")
public class Singletons {

    @GET
    @Path("/enum")
    public long withEnum() {
        return EnumSingleton.INSTANCE.startTime();
    }
}

enum EnumSingleton {
    INSTANCE(System.currentTimeMillis());

    private final long startTime;

    private EnumSingleton(long startTime) {
        this.startTime = startTime;
    }

    long startTime() {
        return startTime;
    }
}

$ curl http://localhost:8080/singletons/enum
1656509254601%

$ curl http://localhost:8080/singletons/enum
1656509254601%

### Restart the native application ###

$ curl http://localhost:8080/singletons/enum
1656509254601%

@Path("/singletons")
public class Singletons {

    @Inject
    CdiSingleton cdiSingleton;

    @GET
    @Path("/cdi")
    public long withCdi() {
        return cdiSingleton.startTime();
    }
}

@Singleton
class CdiSingleton {
    // Note that the field is not static
    final long startTime = System.currentTimeMillis();

    long startTime() {
        return startTime;
    }
}

$ curl http://localhost:8080/singletons/cdi
1656510218554%

$ curl http://localhost:8080/singletons/cdi
1656510218554%

### Restart the native application ###

$ curl http://localhost:8080/singletons/cdi
1656510714689%

public class SaxParserProcessor {

    @BuildStep
    ReflectiveClassBuildItem reflection() {
        // since we only need reflection to the constructor of the class, we can specify `false` for both the methods and the fields arguments.
        return new ReflectiveClassBuildItem(false, false, "com.sun.org.apache.xerces.internal.parsers.SAXParser");
    }

}

public class ResourcesProcessor {

    @BuildStep
    NativeImageResourceBuildItem nativeImageResourceBuildItem() {
        return new NativeImageResourceBuildItem("META-INF/extra.properties");
    }

}

public class S3Processor {

    @BuildStep
    RuntimeInitializedClassBuildItem cryptoConfiguration() {
        return new RuntimeInitializedClassBuildItem(CryptoConfiguration.class.getCanonicalName());
    }

}

public class S3Processor {

    @BuildStep
    NativeImageProxyDefinitionBuildItem httpProxies() {
        return new NativeImageProxyDefinitionBuildItem("org.apache.http.conn.HttpClientConnectionManager",
                "org.apache.http.pool.ConnPoolControl", "com.amazonaws.http.conn.Wrapped");
    }

}