}
}

// in plugin
existingThing = objects.newInstance(DefaultExistingThing.class)
existingThing.convention("some-value")
```

It's not acceptable to treat an unset Provider as if the convention is requested when the convention could be set elsewhere:

```groovy
public interface NewThing {
    Property<String> getSomeProperty()
}

// Unacceptable
String value
if (!getSomeProperty().isPresent()) {

            pluginSession.setDependencyGraphTransformer(session.getDependencyGraphTransformer());

            CollectRequest request = new CollectRequest();
            request.setRequestContext(REPOSITORY_CONTEXT);
            request.setRepositories(repositories);
            request.setRoot(new org.eclipse.aether.graph.Dependency(pluginArtifact, null));
            for (Dependency dependency : plugin.getDependencies()) {

        DefaultBeanConfigurationRequest request = new DefaultBeanConfigurationRequest();
        request.setBean(bean).setConfiguration(config);
        request.setValuePreprocessor(preprocessor).setPathTranslator(translator);

        configurator.configureBean(request);

        assertEquals(Paths.get("base/test").toAbsolutePath(), bean.file);
    }

    @Test

        request.addr = addr != null ? addr : getWINSAddress();
        request.isBroadcast = request.addr == null || isBroadcastAddress(request.addr);

        if (request.isBroadcast) {
            if (request.addr == null) {
                request.addr = this.baddr;
            }
            n = config.getNetbiosRetryCount();
        } else {
            n = 1;
        }

        do {

    /**
     * Sends an SMB request and returns the response
     * @param <T> the response type
     * @param request the request to send
     * @param params optional request parameters
     * @return response message
     * @throws CIFSException if an error occurs sending the request
     */
    <T extends CommonServerMessageBlockResponse> T send(Request<T> request, RequestParam... params) throws CIFSException;

    }

    /**
     * Executes the request based on the HTTP method.
     * @param request The request data.
     * @return The response data.
     */
    @Override
    public ResponseData execute(final RequestData request) {
        return switch (request.getMethod()) {
        case GET -> doGet(request.getUrl());
        case HEAD -> doHead(request.getUrl());
        case POST -> doPost(request.getUrl());

        }
    }

    @Nested
    @DisplayName("Payload Tests")
    class PayloadTests {

        @Test
        @DisplayName("Should retain payload when requested")
        void testRetainPayload() {
            assertFalse(testMessage.isRetainPayload());
            testMessage.retainPayload();
            assertTrue(testMessage.isRetainPayload());
        }

        // noop
    }

    @Override
    public LocalMetadataResult find(RepositorySystemSession session, LocalMetadataRequest request) {
        LocalMetadataResult result = new LocalMetadataResult(request);

        String path;

        Metadata metadata = request.getMetadata();
        String context = request.getContext();

        // noop
    }

    @Override
    public LocalMetadataResult find(RepositorySystemSession session, LocalMetadataRequest request) {
        LocalMetadataResult result = new LocalMetadataResult(request);

        String path;

        Metadata metadata = request.getMetadata();
        String context = request.getContext();

from starlette.responses import JSONResponse


def http_exception_handler(request, exception):
    return JSONResponse({"exception": "http-exception"})


def request_validation_exception_handler(request, exception):
    return JSONResponse({"exception": "request-validation"})


def server_error_exception_handler(request, exception):
    return JSONResponse(status_code=500, content={"exception": "server-error"})