Updating an existing object in [Amazon S3][1] doesn&#39;t differ from creating it in the first place, i.e. the very same [PUT Object][2] operation is used to upload the object and will overwrite the existing one (if it isn&#39;t protected by other means, e.g. via [Using Bucket Policies][3] or [Object Versioning][4])

You can find a complete code sample in [Upload an Object Using the AWS SDK for Java][5], the main part boils down to:

    AmazonS3 s3client = new AmazonS3Client(new PropertiesCredentials(
            S3Sample.class.getResourceAsStream(
            		&quot;AwsCredentials.properties&quot;)));
    try {
        System.out.println(&quot;Uploading a new object to S3 from a file\n&quot;);
        File file = new File(uploadFileName);
        s3client.putObject(new PutObjectRequest(
        		                 bucketName, keyName, file));

     } catch (AmazonServiceException ase) {
        System.out.println(&quot;Caught an AmazonServiceException, which &quot; +
        		&quot;means your request made it &quot; +
                &quot;to Amazon S3, but was rejected with an error response&quot; +
                &quot; for some reason.&quot;);
        // ... error handling based on exception details
    }


  [1]: http://aws.amazon.com/s3/
  [2]: http://docs.amazonwebservices.com/AmazonS3/latest/API/RESTObjectPUT.html
  [3]: http://docs.amazonwebservices.com/AmazonS3/latest/dev/UsingBucketPolicies.html
  [4]: http://docs.amazonwebservices.com/AmazonS3/latest/dev/ObjectVersioning.html
  [5]: http://docs.amazonwebservices.com/AmazonS3/latest/dev/UploadObjSingleOpJava.html

You can use Athena to update with extra rows via an INSERT function. You will need to provide Athena with access to the S3 bucket, crawl the S3 bucket using Amazon Glue to get the table layout, update Glue for the Schema names and data types. Once this has been done you can then update using the Athena console at https://console.aws.amazon.com/athena/home

    INSERT INTO destination_table [(col1,col2,...)]
    VALUES (col1value,col2value,...)[,(col1value,col2value,...)][,...]



Does C# support a variable number of arguments?

If yes,  How does C# support variable no of arguments?

What are the examples? 

How are variable arguments useful?

**EDIT 1**: What are the restrictions on it?

**EDIT 2**: The Question is not about Optional param But Variable Param

Does C# support a variable number of arguments, and how?

When, in Bash, I have two terminals open, each maintain its own history, so hitting arrow-up always presents the previous command entered in that terminal.

In zsh the history is shared, so arrow-up presents the last command entered in either terminal. I rather like that ctrl-R gives me the full, shared history, but is there a way to make arrow-up give me the last command from the active terminal?

Last command in same terminal

I was looking at Amazon S3 Samples, and the samples are there for inserts/deletes...

But I want to update an existing blob with fresh data. Basically the content is a text file, and the text has been modified, I want the S3 object to store the new text content.

How do I do this in Java? 



Can I update an existing Amazon S3 object?

I was looking at Amazon S3 Samples, and the samples are there for inserts/deletes...
But I want to update an existing blob with fresh data. Basically the content is a text file, and the text has been modified, I want the S3 object to store the new text content.
How do I do this in Java?

I have a service defined as follows.

`public String getData(@QueryParam(&quot;date&quot;) Date date)`

I&#39;m trying to pass a `java.util.Date` to it from my client (which is jaxrs:client of CXF, not a generic HTTP client or browser).

My service receives the date as `Thu Mar 01 22:33:10 IST 2012` in the HTTP URL. Since CXF won&#39;t be able to create a `Date` object using this String, my client receives a 404 error.
I tried using a `ParameterHandler` on the service side, but I still can&#39;t parse it successfully because I&#39;m not expecting the date in any specific format.

As per [this post][1], passing a `Date` is supposed to work out of the box, but I can&#39;t seem to get the basic case working. Am I required to do anything in order to successfully pass a Date object from my client to service? Appreciate any help.

Thanks


  [1]: https://stackoverflow.com/questions/583973/jax-rs-jersey-how-to-customize-error-handling &quot;this post&quot;

CXF JAXRS - How do I pass Date as QueryParam

I am trying to develop a very simple client / server where the client converts a file to bytes, sends it to the server, and then converts the bytes back in to a file. 

Currently the program just creates an empty file. I&#39;m not a fantastic Java developer so any help much appreciated.

This is the server part that receives what the client sends.

    ServerSocket serverSocket = null;

        serverSocket = new ServerSocket(4444);


        Socket socket = null;
        socket = serverSocket.accept();

        DataOutputStream out = new DataOutputStream(new BufferedOutputStream(socket.getOutputStream()));
        DataInputStream in = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
        byte[] bytes = new byte[1024];

        in.read(bytes);
        System.out.println(bytes);

        FileOutputStream fos = new FileOutputStream(&quot;C:\\test2.xml&quot;);
        fos.write(bytes);

And here is the client part

    Socket socket = null;
        DataOutputStream out = null;
        DataInputStream in = null;
        String host = &quot;127.0.0.1&quot;;     
        
        socket = new Socket(host, 4444);
        out = new DataOutputStream(new BufferedOutputStream(socket.getOutputStream()));
        in = new DataInputStream(new BufferedInputStream(socket.getInputStream()));

        File file = new File(&quot;C:\\test.xml&quot;);
        //InputStream is = new FileInputStream(file);
        // Get the size of the file
        long length = file.length();
        if (length &gt; Integer.MAX_VALUE) {
            System.out.println(&quot;File is too large.&quot;);
        }
        byte[] bytes = new byte[(int) length];
        
        //out.write(bytes);
        System.out.println(bytes);

        out.close();
        in.close();
        socket.close();

Java sending and receiving file (byte[]) over sockets

I wondered if it makes sense to declare a private method as final as well, and I thought it doesn&#39;t make sense. But I imagined there&#39;s an exclusive situation and wrote the code to figure it out:

    public class Boom {

        private void touchMe() {
    	    System.out.println(&quot;super::I am not overridable!&quot;);
        }
    
        private class Inner extends Boom {

    	    private void touchMe() {
    	        super.touchMe();
    	        System.out.println(&quot;sub::You suck! I overrided you!&quot;);
    	    }
        }
    
        public static void main(String... args) {
    	    Boom boom = new Boom();
    	    Boom.Inner inner = boom.new Inner();
    	    inner.touchMe();
        }
    }

It compiled and worked. &quot;I should make touchMe() final&quot; I thought and did it: 

    public class Boom {

        private final void touchMe() {
    	    System.out.println(&quot;super::I am not overridable!&quot;);
        }
    
        private class Inner extends Boom {

    	    private void touchMe() {
    	        super.touchMe();
    	        System.out.println(&quot;sub::You suck! I overrided you!&quot;);
    	    }
        }
    
        public static void main(String... args) {
    	    Boom boom = new Boom();
    	    Boom.Inner inner = boom.new Inner();
    	    inner.touchMe();
        }
    }

and it also works and tells me

    chicout@chicout-linlap:~$ java Boom
    super::I am not overridable!
    sub::You suck! I overrided you!

why?

Why inner class can override private final method?

I&#39;m getting a compiler warning for the `@SuppressWarnings` annotation in eclipse for the code:

    @Override
    public boolean doSomething(@SuppressWarnings(&quot;unused&quot;) String whatever) throws AnException {
        throw new AnException(&quot;I&#39;m still in bed and can&#39;t do anything until I&#39;ve had a shower!&quot;);
    }

It looks like a yellow squiggle under the word &quot;unused&quot; and on mouse hover I get the tooltip `Unnecessary @SuppressWarnings(&quot;unused&quot;)`.

I think another developer is being prompted to put in these annotations by eclipse and I&#39;m basically being prompted to take them out. How can I configure eclipse to prompt me to put the `@SuppressWarnings` annotation in instead of it complaining about it?

If anyone would like to comment on best practice here then that would also be most welcome.

Unnecessary @SuppressWarnings(&quot;unused&quot;)

**Situation**:

I have a persistable class with variable of java.util.Date type:

    import java.util.Date;

    @Entity
    @Table(name = &quot;prd_period&quot;)
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
    public class Period extends ManagedEntity implements Interval {
            
       @Column(name = &quot;startdate_&quot;, nullable = false)
       private Date startDate;

    }

Corresponding table in DB:

    CREATE TABLE &#39;prd_period&#39; (
      &#39;id_&#39; bigint(20) NOT NULL AUTO_INCREMENT,
     ...
      &#39;startdate_&#39; datetime NOT NULL
    )

Then I save my Period object to DB:

    Period p = new Period();
    Date d = new Date();
    p.setStartDate();
    myDao.save(p);

After then if I&#39;m trying to extract my object from DB, it is returned with variable startDate of Timestamp type - and all the places where I&#39;m trying to use equals(...) are returning false.

**Question**: are there any means to force Hibernate to return dates as object of java.util.Date type instead of Timestamp without explicit modification of every such variable (e.g it must be able just work, without explicit modification of existed variables of java.util.Date type)?


**NOTE:**

I found number of explicit solutions, where annotations are used or setter is modified - but I have many classes with Date-variables - so I need some centralized solution and all that described below is not good enough:

1. **Using annotation @Type:** - java.sql.Date will be returned
  
        @Column
        @Type(type=&quot;date&quot;)
        private Date startDate;

2. **Using annotation @Temporal(TemporalType.DATE)** - java.sql.Date will be returned

        @Temporal(TemporalType.DATE)
        @Column(name=”CREATION_DATE”)
        private Date startDate;

3. **By modifying setter (deep copy)** - java.util.Date will be returned
    
        public void setStartDate(Date startDate) {
            if (startDate != null) {
                this.startDate = new Date(startDate.getTime());
            } else {
                this.startDate = null;
            }
        }

4. **By creation of my own type:** - java.util.Date will be returned

Details are given here: 
http://blogs.sourceallies.com/2012/02/hibernate-date-vs-timestamp/



How to force Hibernate to return dates as java.util.Date instead of Timestamp?

I have a ton of files on my S3 bucket and add a bucket policy to make them all public.
Now it lists the entire directory (or the first 1000 items) when I browse the root.
How can I prevent directory browsing?

How to prevent directory browsing of S3 bucket?

I&#39;d like to copy some files from a production bucket to a development bucket daily.

For example:
Copy productionbucket/feed/feedname/date
to developmentbucket/feed/feedname/date

Because the files I want are so deep in the folder structure, it&#39;s too time consuming to go to each folder and copy/paste.

I&#39;ve played around with mounting drives to each bucket and writing a windows batch script, but that is very slow and it unnecessarily downloads all the files/folders to the local server and back up again.

Best way to move files between S3 buckets?

I have the following folder structure in S3. Is there a way to recursively remove all files under a certain folder (say `foo/bar1 or foo or foo/bar2/1` ..)

    foo/bar1/1/..
    foo/bar1/2/..
    foo/bar1/3/..
        
    foo/bar2/1/..
    foo/bar2/2/..
    foo/bar2/3/..

How to delete files recursively from an S3 bucket

I&#39;m configuring a Django project that were using the server filesystem for storing the apps static files (`STATIC_ROOT`) and user uploaded files (`MEDIA_ROOT`).

I need now to host all that content on Amazon&#39;s S3, so I have created a bucket for this. Using [`django-storages`](http://readthedocs.org/docs/django-storages/en/latest/) with the `boto` storage backend, I managed to upload collected statics to the S3 bucket:

    MEDIA_ROOT = &#39;/media/&#39;
    STATIC_ROOT = &#39;/static/&#39;
    
    DEFAULT_FILE_STORAGE = &#39;storages.backends.s3boto.S3BotoStorage&#39;
    AWS_ACCESS_KEY_ID = &#39;KEY_ID...&#39;
    AWS_SECRET_ACCESS_KEY = &#39;ACCESS_KEY...&#39;
    AWS_STORAGE_BUCKET_NAME = &#39;bucket-name&#39;
    STATICFILES_STORAGE = &#39;storages.backends.s3boto.S3BotoStorage&#39;

Then, I got a problem: the `MEDIA_ROOT` and `STATIC_ROOT` are not used within the bucket, so the bucket root contains both the static files and user uploaded paths.

So then I could set:

    S3_URL = &#39;http://s3.amazonaws.com/%s&#39; % AWS_STORAGE_BUCKET_NAME
    STATIC_URL = S3_URL + STATIC_ROOT
    MEDIA_URL = &#39;S3_URL + MEDIA_ROOT

And use those settings in the templates, but there is no distinction of static/media files when storing in S3 with `django-storages`.

How this can be done?

Thanks!

How to set-up a Django project with django-storages and Amazon S3, but with different folders for static files and media files?

I need to set cache-control headers for an entire s3 bucket, both existing and future files and was hoping to do it in a bucket policy. 
I know I can edit the existing ones and I know how to specify them on put if I upload them myself but unfortunately the app that uploads them cannot set the headers as it uses s3fs to copy the files there.

Set cache-control for entire S3 bucket automatically (using bucket policies?)

I have a MySQL database running in [Amazon RDS][1], and I want to know how to export an entire table to CSV format.

I currently use MySQL server on Windows to query the Amazon database, but when I try to run an export I get an error, probably because there&#39;s no dedicated file server for amazon RDS. Is there a solution to this?

  [1]: https://en.wikipedia.org/wiki/Amazon_Relational_Database_Service






Exporting a table from Amazon RDS into a CSV file

I&#39;ve heard many people using both terms interchangeably. However, in my opinion there is difference between them:

**SCALABILITY** - ability of a *software system* to process higher amount of workload on its current hardware resources (*scale up*) or on current and additional hardware resources (*scale out*) without application service interruption;

**ELASTICITY** - ability of the *hardware layer* below (usually cloud infrastructure) to increase or shrink the amount of the physical resources offered by that hardware layer to the software layer above. The increase / decrease is triggered by business rules defined in advance (usually related to application&#39;s demands). The increase / decrease happens on the fly without physical service interruption. 

Again, scalability is a characteristic of a software architecture related to serving higher amount if workload, where elasticity is a characteristic of the physical layer below, entirely related to hardware budget optimizations. 

Have I got the difference between these two non-functional architectural characteristics right?
May someone give specific examples, so we could draw more distinctive border between these two terms?


What is the difference between scalability and elasticity?

I have a server running the recent Ubuntu AMIs from Canonical. The size of the EBS boot volume is 8GB. I know that I can resize EBS volumes by taking a snapshot, creating a new volume and expanding the partition on it. How can I increase the size of the volume while the machine is running? If this is not possible, what is the preferred method for increasing the boot volume size with minimal downtime?

How do I increase the EBS volume size of a running instance?

We are starting instances, and accessing the user-data we place. But does anybody understand the internals of this operation (from Amazon&#39;s side)? When we pass in the user-data, at what point is that data transmitted to the VM (is this a Xen feature) and where is it stored?

I first thought, it was set as the USER_DATA env var, but we can also pass it as a file. Where is that file stored? Is it generic to all instances or varies depending on AMI?

This is not a problem per se, just wanted to know how Amazon does this.

User data screenshot: http://d.pr/GZlY

Amazon ec2 user-data, how does it work?

I&#39;m a beginner RoR programmer who&#39;s planning to deploy my app using Heroku. Word from my other advisor friends says that Heroku is really easy, good to use. The only problem is that I still have no idea what Heroku does...

I&#39;ve looked at their [website][1] and in a nutshell, what Heroku does is help with scaling but... why does that even matter? How does Heroku help with:

1. Speed - My research implied that deploying AWS on the US East Coast would be the fastest if I am targeting a US/Asia-based audience.

2. Security - How secure are they?

3. Scaling - How does it actually work?

4. Cost efficiency - There&#39;s something like a dyno that makes it easy to scale.

5. How do they fare against their competitors? For example, [Engine Yard][2] and [bluebox][3]?

Please use layman English terms to explain... I&#39;m a beginner programmer.


  [1]: http://www.heroku.com/how/command
  [2]: http://www.engineyard.com/
  [3]: http://www.bluebox.net/

Content Type	Original Author	Original Content on Stackoverflow
Question	Arvind	View Question on Stackoverflow
Solution 1 - Java	Steffen Opel	View Answer on Stackoverflow
Solution 2 - Java	Robin Meisel	View Answer on Stackoverflow

Can I update an existing Amazon S3 object?

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Last command in same terminal

Does C# support a variable number of arguments, and how?

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