## Dependency Injection { #dependency-injection }

Using `BackgroundTasks` also works with the dependency injection system, you can declare a parameter of type `BackgroundTasks` at multiple levels: in a *path operation function*, in a dependency (dependable), in a sub-dependency, etc.

  <dependencies>
    <dependency>
      <groupId>org.apache.maven.its</groupId>
      <artifactId>maven-core-it-support</artifactId>
      <version>1.3</version>
      <scope>runtime</scope>
      <exclusions>
        <exclusion>
          <groupId>commons-lang</groupId>
          <artifactId>commons-lang</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
  </dependencies>

      <url>file://dummy</url>
    </repository>
  </repositories>
  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t06-b</artifactId>
      <version>1.0</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
  </dependencies>

      <url>file://dummy</url>
    </repository>
  </repositories>
  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t07-b</artifactId>
      <version>1.0</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
  </dependencies>

    simple request and response logging. It may be configured to log headers and
    bodies for debugging. It requires this Maven dependency:

     ```xml
     <dependency>
       <groupId>com.squareup.okhttp</groupId>
       <artifactId>logging-interceptor</artifactId>
       <version>2.6.0</version>
     </dependency>
     ```

    Configure basic logging like this:

    ```java

    groups:
      github-actions:
        patterns:
          - "*"

  - package-ecosystem: docker
    directory: /ci/devinfra/docker_windows
    schedule:
      interval: monthly
    ignore:
      - dependency-name: "*"
        update-types: ["version-update:semver-major", "version-update:semver-minor"]

  - package-ecosystem: docker
    directory: /tensorflow/tools/gcs_test
    schedule:
      interval: monthly

     *
     * @return {@code true} if the dependency management information should be retrieved, {@code false} otherwise.
     */
    boolean isResolveManagedVersions();

    /**
     * Enables/disables resolution of the dependency management information.
     *
     * @param resolveManagedVersions {@code true} if the dependency management information should be retrieved, {@code

    <version>0.1</version>
    <packaging>pom</packaging>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.junit</groupId>
                <artifactId>junit</artifactId>
                <version>0.1</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    }
)

client = TestClient(app)


def raise_value_error():
    raise ValueError()


def dependency_with_yield():
    yield raise_value_error()


@app.get("/dependency-with-yield", dependencies=[Depends(dependency_with_yield)])
def with_yield(): ...


@app.get("/http-exception")
def route_with_http_exception():
    raise HTTPException(status_code=400)

    Note over dep_req: Run code up to yield
    dep_req ->> dep_func: Pass dependency
    Note over dep_func: Run code up to yield
    dep_func ->> operation: Run path operation with dependency
    operation ->> dep_func: Return from path operation
    Note over dep_func: Run code after yield
    Note over dep_func: ✅ Dependency closed
    dep_func ->> client: Send response to client
    Note over client: Response sent