How to close AWS connection if there is no such key in the query

问题

I'm using AWS java SDK to upload file on AWS Management Console's Bucket. However, if there is no such file online at first time when I try to get access to it, my code will catch the exception (NoSuchKey). Then I want to close the connection. The problem is I don't have any reference to close that connection because of the exception(The original reference will be null). Here is my code:

    S3Object object = null;
    GetObjectRequest req = new GetObjectRequest(bucketName, fileName);

    try{
        logconfig();

        object = s3Client.getObject(req);
                  ...
    catch(AmazonServiceException e){
        if(e.getErrorCode().equals("NoSuchKey"))

I was trying to use "object" as a reference to close the connection between my eclipse and Aws, but apparently "object" is null when the exception happened. Can anyone tell me how to do it? Furthermore, because I can't close the connection, my console will have this warning every 60 seconds:

8351167 [java-sdk-http-connection-reaper] DEBUG org.apache.http.impl.conn.PoolingClientConnectionManager  - Closing connections idle longer than 60 SECONDS

回答1:

If you use Java 1.7, you can use try-with-resouce block. The object will be closed automatically when leaving the block.

GetObjectRequest req = new GetObjectRequest(bucketName, fileName);
try(S3Object object = s3Client.getObject(req)) {
    ...
} catch(AmazonServiceException e) {
    if(e.getErrorCode().equals("NoSuchKey"));
}

If you use Java 1.6 or prior version, you need to do it in finally block

S3Object object = null;
GetObjectRequest req = new GetObjectRequest(bucketName, fileName);
try {
    object = s3Client.getObject(req))
    ...
} catch(AmazonServiceException e) {
    if(e.getErrorCode().equals("NoSuchKey"));
} finally {
    if (object != null) {
        object.close();
    }
}

来源：https://stackoverflow.com/questions/20233259/how-to-close-aws-connection-if-there-is-no-such-key-in-the-query