# Background Tasks - `BackgroundTasks`

You can declare a parameter in a *path operation function* or dependency function with the type `BackgroundTasks`, and then you can use it to schedule the execution of background tasks after the response is sent.

You can import it directly from `fastapi`:

```python
from fastapi import BackgroundTasks
```

## Requirements

- Java 17 or higher
- SLF4J for logging
- Bouncy Castle (for SMB3 encryption support)

## Using Maven

```xml
<dependency>
    <groupId>org.codelibs</groupId>
    <artifactId>jcifs</artifactId>
    <version>2.1.39</version>
</dependency>
```



## Features

### Protocol Support
The library supports a full range of SMB protocols with automatic negotiation:

    /* MNG-4005: postponed to 3.1
    public void testValidationErrorUponNonUniqueDependencyKey()
        throws Exception
    {
        try
        {
            buildPom( "unique-dependency-key/deps" );
            fail( "Non-unique dependency keys did not cause validation error" );
        }
        catch ( ProjectBuildingException e )
        {
            // expected
        }
    }

    @Test

/**
 * Base interface for service requests that involve remote repository operations.
 * This interface provides common functionality for requests that need to specify
 * and validate remote repositories for artifact resolution, dependency collection,
 * model building, and other Maven operations.
 *
 * <p>Implementations of this interface can specify a list of remote repositories
 * to be used during the operation. If no repositories are specified (null),

Each process, or "runtime", applies different constraints to the code that runs in that process.
For example, each process has different supported JVMs and a different set of services available for dependency injection.
While a lot of Gradle source code runs only in the Gradle daemon, not all of it does so.

        testing/architecture-test/build/reports/binary-compatibility/report.html => binary-compatibility-reports
        build/reports/dependency-verification/** => dependency-verification-reports
        build/reports/problems/problems-report.html
        """.trimIndent()

    setArtifactRules(artifactRuleOverride ?: defaultArtifactRules)

# JSR 305 annotations are for embedding nullability information.
-dontwarn javax.annotation.**

# Animal Sniffer compileOnly dependency to ensure APIs are compatible with older versions of Java.
-dontwarn org.codehaus.mojo.animal_sniffer.*

# OkHttp platform used only on JVM and when Conscrypt and other security providers are available.
# May be used with robolectric or deliberate use of Bouncy Castle on Android
-dontwarn okhttp3.internal.platform.**

- component not found

Plugins:
- plugin metadata missing
- plugin metadata retrieval problem
- plugin artifact missing
- plugin artifact retrieval problem
- plugin dependency metadata missing
- plugin dependency metadata retrieval problem
- plugin configuration problem
- plugin execution failure due to something that is known to possibly go wrong (like compilation failure)

    model: CIBuildModel,
    prevStage: Stage,
    os: Os? = null,
) {
    if (os == null || stageWithOsTriggers.getOrDefault(prevStage.stageName, emptyList()).contains(os)) {
        dependency(RelativeId(stageTriggerId(model, prevStage, os))) {
            snapshot {
                onDependencyFailure = FailureAction.FAIL_TO_START
                onDependencyCancel = FailureAction.FAIL_TO_START
            }

# `Request` class

You can declare a parameter in a *path operation function* or dependency to be of type `Request` and then you can access the raw request object directly, without any validation, etc.

You can import it directly from `fastapi`:

```python
from fastapi import Request
```

/// tip