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Paste into text area

I tried to make my day easier making a program that will register my self into card game tournaments via selenium webdriver. I am beginner so I was thrilled even though it was just basics aka click here, confirm this, write that but at the end I ran into a problem that I am having trouble solving.
At the end you need to submit decks via deck code. The sendKeys function? (not sure if thats the correct wording) does not work since it actually needs to be pasted into the text area. Whenever you try to "just" write into the box it says its invalid deck code.
driver.findElement(By.xpath("//*[#id=\"react-root\"]/div/div/div[2]/div/div[2]/div/div[4]/div[1]/div/textarea")).click();
driver.findElement(By.xpath("//*[#id=\\\"react-root\\\"]/div/div/div[2]/div/div[2]/div/div[4]/div[1]/div/textarea")).sendKeys(Keys.chord(Keys.CONTROL + "v"));
I went with this, first line just clicking in to the text area and then trying to paste it in (while I copied the deck code manually, not sure how I will solve this since I need to paste 3 different ones, but that is issue for the future) but the code just wont paste and I have no idea where is the catch. I tried the paste function in different text area with the same settings meaning I have something copied in my clipboard and it worked just fine.
Example of the deck code is
" AAECAZICCiT3A94FrtICv/IC9fwC2KAD+KED9KID/KMDCkBWX/4BxAapogPIogPcogPvogPZqQMA "
I hope I provided everything I should have otherwise let me know and I will gladly post more :) Thanks in advance and I hope someone can help me

This might not work because I don't see you explicitly copying the deck code, as you mentioned you did it manually. I also modified your example to not use Keys.chord, as you might not need them here.
To copy the element:
deckCodeWebElement = driver.findElement(locatorToFindDeckCode);
deckCodeWebElement.send_keys(Keys.CONTROL+'a')
time.sleep(1)
deckCodeWebElement.send_keys(Keys.CONTROL+'c')
Then, to paste:
deckCodeWebElementToPaste = driver.findElement(locatorToFindDeckCodeToPaste);
deckCodeWebElementToPaste.send_keys(Keys.CONTROL+'v')
On another note, I recommend shortening your XPaths to relative notation, as the absolute notation you are using is very brittle and breaks very easy. You want to find elements irrespective of their location in the DOM tree.
You can change this:
//*[#id=\\\"react-root\\\"]/div/div/div[2]/div/div[2]/div/div[4]/div[1]/div/textarea
to just this:
//textarea
You may need to query on something like ID, class, or name if there are multiple textarea elements, but there is no need to start at the root node and use div[2] and div[4] unless absolutely necessary.

Printout problems on Bluej

I wanted to print a few programs for a school project on bluej. When I click the print button and set the paper size to A4 and give 'OK' the print comes in a weird small box. I tried increasing the font size. No changes happened. I also changed the page type to the different ones available, but no luck. Please tell me how to solve this problem.

There are two possible ways to solve your problem. The first is to copy-paste your code into another program, for example Word. The second way is to printscreen the code you want to print and then spread this picture across the A4. Maybe you should cut the edges off first.

Dynamic amount of entries in GUI using java

I'm working on creating a basic user interface and I wanted to try and create a portion that is in a scrollTaskPane and is capable of holding multiple entries. As I'm going about creating it I can obviously test it with a simple amount of entries but I'm confused how I can go about later allowing for it to take input to create entries in the scrollTaskPane of maybe 1 entry one time, and then later needing to allow for input of 20 entries. I only know how to use absolute positioning and am trying to figure out the best way to go about it. I also need to later be able to select each entry.
For the entries that will eventually be called and displayed in my interface, I'm planning to store them in a simple text file and use a semicolon as a delimiter between the task "Type" "Name" "Description"(which will be accessible through a button) and "Due Date". Or I may try to learn to use a database for the information. But I haven't decided yet and don't know anything about connecting a database with a java program.
This is the current look (the scrollTaskPane in the middle). And my goal is to put in entries that are each rectangle boxes going across the scrollTaskPane with a checkbox on the end of them. Should I use some sort of grid layout? Or something else? I'm a beginner at user interfaces, so any help is appreciated!

You can make a custom layout, and then keep adding those layout. So extend a layout class, add TextField and a check box in the layout. Initialize the layout with your values, add then add to the ScrollTaskPane.

Best way to implement a selection box from a large number of entries

I have a large set of data from which the user has to select one. I'm thinking of a way to implement it (of course, in a GUI). I have a few ideas. But just thought of posting here as there may be better alternatives..
Say, user has to select a name from a large set of user base. If I simply put a text field for user to enter the name, then there can be issues like entering same name in different formats, misspelling etc...
I see two options here
Using a combo box
Using a list (Actually i'm thinking of something like a tool tip. As I cant show the whole list always due to space issues)
But combo box won't be much user friendly i guess. As the user will have to scroll around the whole list to select an entry. If the number of entries are too large, this will be
Which means, now I'm left only one option. A popping up list, which will change the content according the text user is entering in the text field. So he can type first few letters and the list will show all the entries starting from the entered text. Got my point, right?
Are there any other better to achieve this kind of need?
If I'm going to implement above, what will be the best way to follow. I'm thinking of extending the JTextField to add required functionality. Well, I'll put some method to set the popup list entries. And I'll add some actionListner to watch the text field, and control the popup list accordingly...

Autocomplete is what you are probably looking for. Google for "java swing jcombobox autocomplete" and limit results for the last couple of years to get relevant results. There will be a lot of examples and ideas on how to implement this with custom code.
I believe there is also some custom libraries like "swingx" that provide at least partial or full implementations to save time.
http://swingx.java.net/
They have released code as recently as the beginning of this years so it appears active and might have what you need.

You could take a look at SwingLab's autocomplete feature, it allows you to attach it to a JCombBox, JList or JTextComponent

use AutoComplete JComboBox/JTextField
based on Standard Java Classes
no issue with larger sets of data
no issue with Focus, BackSpace Key, Caret
for better performance to required sort the array before use
simple workaround for setStrict(true/false), restrict input to array

Make Label Displayed Inside a Vertex Box (jgraphx library)

I need my vertex label displayed entirely inside vertex bounds. I mean if my label is too long then part of it will be displayed outside the vertex box. Is there any way to automatically split label into multiple lines and make it fit the vertex bounds? This line breaks should be recalculated after vertex resize. Can i do it using styles? mxUtils.wordWrap() seems to be the way but i cannot figure out how to use it properly. Give me an example of using it please. Thanks for your answers

Another similar question: Calculate the display width of a string in Java
Abstract:
Graphics.getFontMetrics + FontMetrics.stringWidth
From this, I suppose you could create a List<String> and add the words of the text one at a time until you reach your max length, then add a new node to the list for the overflow. Finally, append each node in the List to each other with a line break in between.
On another note, from what research I did, it seems jGraphX runs on swing. Swing now supports HTML. Here's a link to further info: http://docs.oracle.com/javase/tutorial/uiswing/components/html.html.
I will see if I can get a quick test coded up, but that must wait until I get home.