Package org.a2aproject.sdk.spec

Class TaskNotCancelableError

java.lang.Object

java.lang.Throwable

java.lang.Exception

java.lang.RuntimeException

org.a2aproject.sdk.spec.A2AError

org.a2aproject.sdk.spec.A2AProtocolError

org.a2aproject.sdk.spec.TaskNotCancelableError

All Implemented Interfaces:

Serializable, Event

public class TaskNotCancelableError
extends A2AProtocolError

A2A Protocol error indicating that a task cannot be canceled in its current state.

This error is returned when a client attempts to cancel a task but the task is in a terminal state (TaskState.TASK_STATE_COMPLETED, TaskState.TASK_STATE_FAILED, TaskState.TASK_STATE_CANCELED) where cancellation is not applicable.

Tasks can only be canceled when they are in non-terminal states such as TaskState.TASK_STATE_SUBMITTED or TaskState.TASK_STATE_WORKING.

Corresponds to A2A-specific error code -32002.

Usage example:

 Task task = taskStore.getTask(taskId);
 if (task.status().state().isFinal()) {
     throw new TaskNotCancelableError(
         "Task in " + task.status().state() + " state cannot be canceled"
     );
 }
 

See Also:

• for task state definitions
• for current task state
• A2A Protocol Specification
• Serialized Form

Constructor Summary

Constructors

Constructor	Description
TaskNotCancelableError()	Constructs error with default message.
TaskNotCancelableError(@Nullable Integer code, @Nullable String message, @Nullable Map<String,Object> details)	Constructs error with all parameters.
TaskNotCancelableError(String message)	Constructs error with custom message.

Method Summary

Methods inherited from class org.a2aproject.sdk.spec.A2AError

getCode, getDetails

Methods inherited from class java.lang.Throwable

addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

TaskNotCancelableError

public TaskNotCancelableError()

Constructs error with default message.

TaskNotCancelableError

public TaskNotCancelableError(@Nullable Integer code,
 @Nullable String message,
 @Nullable Map<String,Object> details)

Constructs error with all parameters.

Parameters:

code - the error code (defaults to -32002 if null)

message - the error message (defaults to "Task cannot be canceled" if null)

details - additional error details (optional)

TaskNotCancelableError

public TaskNotCancelableError(String message)

Constructs error with custom message.

Parameters:

message - the error message