S3: Unable to execute HTTP request: Connection or outbound has closed

[SHxKM]

I've recently refactored code that reads a gzipped S3 file,

From this:

try {
            byte[] byteArray = IOUtils.toByteArray(s3Object.getObjectContent());
            String fileInStringFormat = GzipUtils.decompress(byteArray);

            // To ensure that the network connection doesn't remain open, close any open input streams.
            try {
                s3Object.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

            retVal = fileStringContentToFileModel(fileInStringFormat);
        } catch (IOException ex) {
            LoggingHelper.logException(LOGGER, String.format("Failed to convert s3 object to string. key: %s",
                    s3Object.getKey()), ex);
        }

To this:

try (final S3ObjectInputStream innerS3Content = s3Object.getObjectContent();
             final GZIPInputStream gis = new GZIPInputStream(innerS3Content);
             final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(gis, StandardCharsets.UTF_8))) {
            retVal = privateObjMapper.readValue(reader, MyObj.class)
        } catch (IOException e) {
            LoggingHelper.logException(LOGGER, String.format("Failed to convert s3 object to model. key: %s",
                    s3Object.getKey()), e);
        }

Note that privateObjMapper is a Jackson ObjectMapper which is configured with .disable(JsonParser.Feature.AUTO_CLOSE_SOURCE), because the try-with-resources is supposed to call close() on all open resources.

Elsewhere in the code, I have the following that UPLOADS S3 files:

try {
            ByteArrayInputStream inputStream = new ByteArrayInputStream(content);

            ObjectMetadata metadata = new ObjectMetadata();
            metadata.setContentLength(content.length);
            s3Client.putObject(bucketName, s3FileKey, inputStream, metadata);

            try {
                 inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

            retVal = true;
            LOGGER.debug("Finished Uploading {} to S3 bucket", s3FileKey);
        } catch (SdkClientException ex) {
            LoggingHelper.logException(LOGGER, String.format("Failed to store file in s3. file name: %s", s3FileKey),
                    ex);
        } catch (IllegalStateException ex) {
            LoggingHelper.logException(LOGGER, String.format("IllegalStateException. Failed to store file in s3. file name: %s. Loading S3 client", s3FileKey),
                    ex);
            loadS3Client();
        }

This code is now continually getting the following exception (fuller traceback attached at end of post): java.net.SocketException: Connection or outbound has closed.

The files ARE getting uploaded. So what's the significance of this exception and how can I avoid it?

Why is this happening? I've also tried calling close() on the s3Object explicitly, but that didn't help either. Why was this message not displayed before, and is suddenly appearing? what am I missing?

Traceback:

java.net.SocketException: Connection or outbound has closed
	at java.base/sun.security.ssl.SSLSocketImpl$AppOutputStream.write(SSLSocketImpl.java:1291)
	at org.apache.http.impl.io.SessionOutputBufferImpl.streamWrite(SessionOutputBufferImpl.java:124)
	at org.apache.http.impl.io.SessionOutputBufferImpl.flushBuffer(SessionOutputBufferImpl.java:136)
	at org.apache.http.impl.io.SessionOutputBufferImpl.write(SessionOutputBufferImpl.java:167)
	at org.apache.http.impl.io.ContentLengthOutputStream.write(ContentLengthOutputStream.java:113)
	at org.apache.http.entity.InputStreamEntity.writeTo(InputStreamEntity.java:144)
	at com.amazonaws.http.RepeatableInputStreamRequestEntity.writeTo(RepeatableInputStreamRequestEntity.java:160)
	at org.apache.http.impl.DefaultBHttpClientConnection.sendRequestEntity(DefaultBHttpClientConnection.java:156)
	at org.apache.http.impl.conn.CPoolProxy.sendRequestEntity(CPoolProxy.java:152)
	at org.apache.http.protocol.HttpRequestExecutor.doSendRequest(HttpRequestExecutor.java:238)
	at com.amazonaws.http.protocol.SdkHttpRequestExecutor.doSendRequest(SdkHttpRequestExecutor.java:63)
	at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:123)
	at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:272)
	at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186)
	at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
	at com.amazonaws.http.apache.client.impl.SdkHttpClient.execute(SdkHttpClient.java:72)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeOneRequest(AmazonHttpClient.java:1346)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1157)
	... 90 common frames omitted
Wrapped by: com.amazonaws.SdkClientException: Unable to execute HTTP request: Connection or outbound has closed
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleRetryableException(AmazonHttpClient.java:1219)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1165)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:814)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:781)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:755)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:715)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:697)
	at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:561)
	at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:541)
	at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:5453)
	at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:5400)
	at com.amazonaws.services.s3.AmazonS3Client.access$300(AmazonS3Client.java:421)
	at com.amazonaws.services.s3.AmazonS3Client$PutObjectStrategy.invokeServiceCall(AmazonS3Client.java:6528)
	at com.amazonaws.services.s3.AmazonS3Client.uploadObject(AmazonS3Client.java:1861)
	at com.amazonaws.services.s3.AmazonS3Client.putObject(AmazonS3Client.java:1821)
	at com.amazonaws.services.s3.AmazonS3Client.putObject(AmazonS3Client.java:1753)

[SHxKM]

Could this be because try-with-resources will close all three resources, while only one of them should be closed...? I don't think this is valid because in Java you should be able to call close() on a resource multiple times. In other words, is close() not idempotent?

And why would closing an inputStream properly on one side (downloading), affect the other side - uploading?