Package dev.langchain4j.exception

package dev.langchain4j.exception
  • Exception Classes
    Class
    Description
    AsyncNotSupportedException
    Signals that an asynchronous SPI method (an *Async method, or a reactive Publisher-returning method) is not implemented by a component, and is therefore the internal "this component is not genuinely asynchronous" marker carried by those methods' default implementations.
    AuthenticationException
    Thrown when a request is rejected because the supplied credentials are missing, invalid, or insufficient (HTTP 401 / 403).
    ContentFilteredException
    Exception thrown when the LLM provider refuses to process a request due to content filtering or violation of usage policies.
    HttpException
    Represents an HTTP-level error returned by a model provider.
    InternalServerException
    Thrown when the model provider returns a server-side error (HTTP 5xx).
    InvalidRequestException
    Thrown when the model provider rejects a request because the request itself is malformed or violates the provider's constraints (HTTP 4xx, excluding 401, 403, 404, 408, and 429).
    JsonException
    Thrown when LangChain4j cannot read or write JSON.
    JsonReadException
    Thrown when JSON cannot be read: it is malformed, or it does not describe the expected type.
    JsonTypeNotAllowedException
    Thrown when JSON that carries type information names a type the reader is not allowed to instantiate.
    JsonWriteException
    Thrown when an object cannot be written as JSON.
    LangChain4jException
    The root unchecked exception for all LangChain4j-specific errors.
    ModelNotFoundException
    Thrown when the requested model does not exist or is not accessible by the caller (HTTP 404).
    NonRetriableException
    Indicates a permanent error for which retrying the same request will not help.
    RateLimitException
    Thrown when the model provider rejects a request because the caller has exceeded its allowed request or token quota within a time window (HTTP 429).
    RetriableException
    Indicates a transient error that may succeed if the request is retried.
    TimeoutException
    Thrown when a request to the model provider does not complete within the configured time limit (HTTP 408 or a client-side read/connect timeout).
    ToolArgumentsException
    Indicates that something is wrong with the tool arguments.
    ToolExecutionException
    Indicates that something went wrong while executing the tool.
    UnresolvedModelServerException
    Thrown when the model provider's host cannot be resolved (DNS failure or UnresolvedAddressException).
    UnsupportedFeatureException
    Thrown when a requested feature is not supported by the current model provider or the specific model being used.