Parameter param = params.get(i);
      if (i != indexOfParamToSetToNull) {
        args[i] = getDefaultValue(param.getType());
        Assert.assertTrue(
            "Can't find or create a sample instance for type '"
                + param.getType()
                + "'; please provide one using NullPointerTester.setDefault()",
            args[i] != null || isNullable(param));
      }
    }

                <template>src/main/mdo/writer-ex.vm</template>
              </templates>
              <params>
                <param>packageModelV3=org.apache.maven.model</param>
                <param>packageModelV4=org.apache.maven.api.model</param>
                <param>packageToolV4=org.apache.maven.model.v4</param>
              </params>
            </configuration>
          </execution>
        </executions>
      </plugin>

import org.gradle.api.tasks.testing.Test
import org.gradle.util.GradleVersion
import java.io.StringReader
import java.util.Properties


abstract class BuildBucketProvider : BuildService<BuildBucketProvider.Params> {

    interface Params : BuildServiceParameters {
        val includeTestClasses: Property<String>
        val excludeTestClasses: Property<String>
        val onlyTestGradleVersion: Property<String>

    TF_Operation* less_than = LessThan(
        params->cond_inputs[0], params->cond_inputs[1], params->cond_graph, s_);
    ASSERT_EQ(TF_OK, TF_GetCode(s_)) << TF_Message(s_);
    params->cond_output = {less_than, 0};

    TF_Operation* add1 = Add(params->body_inputs[0], params->body_inputs[1],
                             params->body_graph, s_, "add1");
    ASSERT_EQ(TF_OK, TF_GetCode(s_)) << TF_Message(s_);

        Object proxy, Method method, @Nullable Object[] args) {
      Invokable<?, ?> invokable = interfaceType.method(method);
      ImmutableList<Parameter> params = invokable.getParameters();
      for (int i = 0; i < args.length; i++) {
        Parameter param = params.get(i);
        if (!isNullable(param)) {
          checkNotNull(args[i]);
        }
      }
      return dummyReturnValue(interfaceType.resolveType(method.getGenericReturnType()));

///

```Python hl_lines="11-14"
{!> ../../docs_src/body_fields/tutorial001.py!}
```

////

`Field` 的工作方式和 `Query`、`Path`、`Body` 相同，参数也相同。

/// note | "技术细节"

实际上，`Query`、`Path` 都是 `Params` 的子类，而 `Params` 类又是 Pydantic 中 `FieldInfo` 的子类。

Pydantic 的 `Field` 返回也是 `FieldInfo` 的类实例。

`Body` 直接返回的也是 `FieldInfo` 的子类的对象。后文还会介绍一些 `Body` 的子类。

注意，从 `fastapi` 导入的 `Query`、`Path` 等对象实际上都是返回特殊类的函数。

///

            }
            saveInfo(messages -> messages.addSuccessUploadKuromojiFile(GLOBAL));
            return redirectWith(getClass(), moreUrl("list/1").params("dictId", form.dictId));
        }).orElseGet(() -> {
            throwValidationError(messages -> messages.addErrorsFailedToUploadKuromojiFile(GLOBAL), () -> uploadpage(form.dictId));
            return null;
        });

            }
            saveInfo(messages -> messages.addSuccessUploadStemmeroverrideFile(GLOBAL));
            return redirectWith(getClass(), moreUrl("list/1").params("dictId", form.dictId));
        }).orElseGet(() -> {
            throwValidationError(messages -> messages.addErrorsFailedToUploadStemmeroverrideFile(GLOBAL), () -> uploadpage(form.dictId));
            return null;

import okhttp3.HttpUrl.Companion.defaultPort
import okhttp3.HttpUrl.Companion.toHttpUrl
import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
import okio.buffer
import okio.source
import org.junit.jupiter.params.ParameterizedTest
import org.junit.jupiter.params.provider.ArgumentsSource

/** Runs the web platform URL tests against Java URL models.  */
class WebPlatformUrlTest {
  class TestDataParamProvider : SimpleProvider() {

    private static final List<Class<? extends Annotation>> NULLABLE_ANNOTATIONS = [Nullable, org.jetbrains.annotations.Nullable]

    NullabilityBreakingChangesRule(Map<String, Object> params) {
        super(params)
    }

    @Override
    Violation maybeViolation(JApiCompatibility member) {

        if (isNewOrRemoved(member)) {
            return null
        }

        List<String> warnings = []