## Injeção de dependências { #dependency-injection }

Usar `BackgroundTasks` também funciona com o sistema de injeção de dependências; você pode declarar um parâmetro do tipo `BackgroundTasks` em vários níveis: em uma *função de operação de rota*, em uma dependência (dependable), em uma subdependência, etc.

			<version>${commons.io.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-lang3</artifactId>
			<version>${commons.lang3.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-text</artifactId>
			<version>${commons.text.version}</version>
		</dependency>
		<dependency>
			<groupId>commons-net</groupId>

    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-api-di</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-api-model</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-api-settings</artifactId>
    </dependency>
    <dependency>

    </dependency>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-api-spi</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-api-core</artifactId>
    </dependency>

    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-xml</artifactId>
    </dependency>
    <dependency>

        ("/asynchronous-method-gen-dependency", "asynchronous-method-gen-dependency"),
        ("/callable-dependency-class", "callable-dependency-class"),
        ("/callable-gen-dependency-class", "callable-gen-dependency-class"),
        ("/async-callable-dependency-class", "async-callable-dependency-class"),
        ("/async-callable-gen-dependency-class", "async-callable-gen-dependency-class"),

        dependency.setArtifactId("apache");
        dependency.setVersion("1");

        assertNotNull(this.newModelResolver().resolveModel(dependency));
        assertEquals("1", dependency.getVersion());
    }

    @Test
    void testResolveDependencySuccessfullyResolvesExistingDependencyUsingHighestVersion() throws Exception {
        final Dependency dependency = new Dependency();

		</dependency>
		<dependency>
			<groupId>org.apache.logging.log4j</groupId>
			<artifactId>log4j-api</artifactId>
			<version>${log4j.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.logging.log4j</groupId>
			<artifactId>log4j-core</artifactId>
			<version>${log4j.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.logging.log4j</groupId>

    </dependency>
    <dependency>
      <groupId>org.jline</groupId>
      <artifactId>jline-terminal-jni</artifactId>
    </dependency>
    <dependency>
      <groupId>org.jline</groupId>
      <artifactId>jline-terminal-ffm</artifactId>
    </dependency>

    <!-- (legacy) DI annotations -->
    <dependency>
      <groupId>javax.inject</groupId>
      <artifactId>javax.inject</artifactId>
    </dependency>

    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-api-model</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-api-xml</artifactId>
    </dependency>

    <!-- Maven4 impl -->
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-core</artifactId>
    </dependency>
    <dependency>

    </dependency>
    <dependency>
      <groupId>ognl</groupId>
      <artifactId>ognl</artifactId>
      <version>3.0.12</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>marmalade</groupId>
      <artifactId>marmalade-core</artifactId>
      <version>0.1</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>