}

        @ParameterizedTest(name = "from {0} to {0}")
        @ValueSource(strings = {"4.0.0", "4.1.0", "4.2.0"})
        @DisplayName("should reject upgrade to same version")
        void shouldRejectUpgradeToSameVersion(String version) {
            assertFalse(ModelVersionUtils.canUpgrade(version, version));
        }

        @ParameterizedTest(name = "from {0}")

	"http://dbflute.org/meta/lastadi10.dtd">
<components>
	<component name="groovyEngine"
		class="org.codelibs.fess.script.groovy.GroovyEngine">
		<!--
		<property name="scriptCacheSize">1000</property>
		<property name="maxScriptLogLength">200</property>
		-->
		<postConstruct name="init"></postConstruct>
		<postConstruct name="register"></postConstruct>
	</component>

name: Java CI with Maven

on:
  push:
    branches:
    - master
    - "*.x"
  pull_request:
    branches:
    - master
    - "*.x"

jobs:
  build:

    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v2
    - name: Set up JDK 21
      uses: actions/setup-java@v2
      with:

            String name = (String) e.nextElement();
            String value = props.getProperty(name);
            if (value == null) {
                value = callback.apply(name);
            }
            if (name.startsWith(OVERRIDE_PREFIX)) {
                String overrideName = name.substring(OVERRIDE_PREFIX.length());
                props.put(overrideName, substVars(value, name, props, callback));
            } else {

例として次の関数を見てみましょう:

```python
from typing import Optional


def say_hi(name: Optional[str]):
    print(f"Hey {name}!")
```

パラメータ `name` は `Optional[str]` と定義されていますが、任意ではありません。このパラメータなしで関数を呼び出すことはできません:

```Python
say_hi()  # あっ、これはエラーになります！😱
```

`name` パラメータにはデフォルト値がないため、依然として必須（任意ではない）です。ただし、`name` は値として `None` を受け付けます:

```Python
say_hi(name=None)  # これは動作します。None は有効です 🎉
```

    //
    // ----------------------------------------------------------------------

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

     *
     * @param name the pipe name to wait for
     */
    public FsctlPipeWaitRequest(final String name) {
        this.nameBytes = name.getBytes(StandardCharsets.UTF_16LE);
        this.timeoutSpecified = false;
        this.timeout = 0;
    }

    /**
     * Constructs a pipe wait request with timeout.
     *
     * @param name the pipe name to wait for

<div class="wrapper">
    <jsp:include page="/WEB-INF/view/common/admin/header.jsp"></jsp:include>
    <jsp:include page="/WEB-INF/view/common/admin/sidebar.jsp">
        <jsp:param name="menuCategoryType" value="crawl"/>
        <jsp:param name="menuType" value="pathMapping"/>
    </jsp:include>
    <main class="content-wrapper">
        <div class="content-header">
            <div class="container-fluid">

public class ContainerNotAvailableException extends FessSystemException {

    private static final long serialVersionUID = 1L;

    /** The name of the component that is not available. */
    private String componentName;

    /**
     * Constructor with component name.
     * @param componentName The name of the component that is not available.
     */
    public ContainerNotAvailableException(final String componentName) {

configure<MavenPublishBaseExtension> {
  publishToMavenCentral(automaticRelease = true)
  signAllPublications()
  pom {
    name.set(project.name)
    description.set("Square’s meticulous HTTP client for Java and Kotlin.")
    url.set("https://square.github.io/okhttp/")
    licenses {
      license {
        name.set("The Apache Software License, Version 2.0")
        url.set("https://www.apache.org/licenses/LICENSE-2.0.txt")