AWSLambdaClient invoke giving exception: com.amazonaws.SdkClientException: Unable to execute HTTP request: The target server failed to respond

I have an existing aws lambda function and I am trying to invoke it using AWSLambdaClient (library: aws-java-sdk-lambda). I get the response if the runtime for lambda is less than 5 mins. But if the lambda runtime is more than 5 mins I get the exception:

com.amazonaws.SdkClientException: Unable to execute HTTP request: The target server failed to respond

What configuration I am missing while setting up lambda client ?

Full stack trace:

Exception in thread "main" com.amazonaws.SdkClientException: Unable to execute HTTP request: The target server failed to respond
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleRetryableException(AmazonHttpClient.java:1163)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1109)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:758)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:732)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:714)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:674)
at com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:656)
at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:520)
at com.amazonaws.services.lambda.AWSLambdaClient.doInvoke(AWSLambdaClient.java:3154)
at com.amazonaws.services.lambda.AWSLambdaClient.invoke(AWSLambdaClient.java:3121)
at com.amazonaws.services.lambda.AWSLambdaClient.invoke(AWSLambdaClient.java:3110)
at com.amazonaws.services.lambda.AWSLambdaClient.executeInvoke(AWSLambdaClient.java:1735)
at com.amazonaws.services.lambda.AWSLambdaClient.invoke(AWSLambdaClient.java:1707)
at LambdaTest.main(LambdaTest.java:48)
Caused by: org.apache.http.NoHttpResponseException: The target server failed to respond
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:141)
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:56)
at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259)
at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:163)
at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:165)
at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273)
at com.amazonaws.http.protocol.SdkHttpRequestExecutor.doReceiveResponse(SdkHttpRequestExecutor.java:82)
at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:272)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
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$RequestExecutor.executeOneRequest(AmazonHttpClient.java:1285)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1101)
... 12 more

I have already increased my lambda max timeout to 15 mins on aws lambda console. Also I have made code changes and set ClientExecutionTimeout, ConnectionTimeout, RequestTimeout and SocketTimeout to 15 mins (900 sec) in AWSLambdaClient configuration.

ClientConfiguration configuration = new ClientConfiguration()
            .withMaxErrorRetry(0)
            // These is measured in milliseconds.
            .withClientExecutionTimeout(900 * 1000)
            .withConnectionTimeout(900 * 1000)
            .withRequestTimeout(900 * 1000)
            .withSocketTimeout(900 * 1000);
AWSLambda lambdaClient = AWSLambdaClientBuilder
            .standard()
            .withRegion(region)
            .withClientConfiguration(configuration)
            .withCredentials(new AWSStaticCredentialsProvider(creds)).build();
InvokeRequest request = new InvokeRequest()
            .withFunctionName(functionName)
            .withInvocationType(InvocationType.RequestResponse)
            .withLogType(LogType.Tail);
InvokeResult result = lambdaClient.invoke(request);
String responseLog = new String(Base64.getDecoder().decode(result.getLogResult()), StandardCharsets.UTF_8);
System.out.println(responseLog);

I am using apache HttpClient: 4.5.5

I saw some question https://stackoverflow.com/a/44703601/9669982 I tried some configurations also:

configuration.setValidateAfterInactivityMillis(900 * 1000);

Also to try more I also used:

configuration.setConnectionMaxIdleMillis(900*1000);
configuration.setUseTcpKeepAlive(true);

But no luck.

On AWS Cloudwatch I see that my lambda function is running fine and full task was executed and no trace of any kind of error was there on cloudwatch but I am getting the above exception.

I can't get what I am missing.