Last updated: 2020-06-16 14:53:41


    Whenever a COS request fails when calling this SDK, it throws a RuntimeExcpetion. The common SDK exceptions are CosClientException, CosServiceException, and IllegalArgumentException.

    Client Exception

    The client exception, CosClientException, results from unexpected interaction issues between the client and the COS server, such as a failure to connect to the server, a failure to parse the data returned by the server, or the occurrence of an IO exception when reading a local file. Inherited from RuntimeException, CosClientException has no custom member variables, and is used in the same way as RuntimeException.

    Server Exception

    The server exception, CosServerException, occurs when the client interacts with the COS server normally, but the operation fails. For example, the client accesses a bucket that does not exist, deletes a file that does not exist, or does not have the permission to perform an operation, etc. CosServiceException contains the status code returned by the server, the requestid, the error details, and so on. After an exception is captured, we recommended that you print out the entire exception as it contains necessary factors for troubleshooting. The member variables of exception are described as follows:

    Request Element Description Type
    requestId Request ID, used to identify a request. It is very important for troubleshooting. String
    traceId ID for troubleshooting String
    statusCode Status code in the response. A 4XX status code represents a request failure caused by the client, and a 5XX status code represents a failure caused by a server exception. For more information, see COS Error Codes. String
    errorType Enumeration type, indicating the type of exception, e.g., Client, Service, Unknown ErrorType
    errorCode Error code returned by the body when the request fails. For more information, see Error Codes. String
    errorMessage Error message returned by the body when the request fails. For more information, see Error Codes. String


    If you have any questions about the Java SDK, see the Java SDK section in API and SDK FAQs.