`Settings` | `Editor` | `General` | `Editor Tabs` | **Tab limit**.

[![Type in tabs in search][1]][1]

  [1]: https://i.stack.imgur.com/lQgA8.png

You may also want to increase the recent files limit in `Settings` | `Editor` | `General` | **Recent files limit** if you are using the **Recent Files** (&lt;kbd&gt;Cmd&lt;/kbd&gt;+&lt;kbd&gt;E&lt;/kbd&gt;) feature.

Works for all IntelliJ IDEA platform based IDEs.

Same as best answer but with snapshots!! (windows 10 with IntelliJ Idea 2018.2.4): 

[![File -&gt; Settings ][1]][1]
[![Type in tabs in search][2]][2]

  [1]: https://i.stack.imgur.com/O0C2T.png
  [2]: https://i.stack.imgur.com/lQgA8.png

**If you are a windows user** you can use the below shortcuts to open a new window for ***any multiwindow supported app***. 

**`Shift + Click`** - after giving Shift + Click for taskbar showing app icon it will generate a new window. 

**`Middle Mouse Button`** - after puting the cursor taskbar showing the icon and press it with the middle mouse button. It will open a new window.


I&#39;ve got a R script for which I&#39;d like to be able to supply several command-line parameters (rather than hardcode parameter values in the code itself).  The script runs on Windows.

I can&#39;t find info on how to read parameters supplied on the command-line into my R script.  I&#39;d be surprised if it can&#39;t be done, so maybe I&#39;m just not using the best keywords in my Google search...

Any pointers or recommendations?

How can I read command line parameters from an R script?

In terms of artificial intelligence and machine learning, what is the difference between supervised and unsupervised learning?
Can you provide a basic, easy explanation with an example? 

What is the difference between supervised learning and unsupervised learning?

I am building a grails-app with IntelliJ 9.0 and I am a huge fan of the CTR+TAB shortcut that switches between active editors.

However, by default, IntelliJ keeps ONLY 10 active editors opened at the same time. It is clearly not enough for me.

Do you know, if possible, how I can configure my IDE to have more active editors opened at the same time ?


How to increase the maximum number of opened editors in IntelliJ?

I am building a grails-app with IntelliJ 9.0 and I am a huge fan of the CTR+TAB shortcut that switches between active editors.
However, by default, IntelliJ keeps ONLY 10 active editors opened at the same time. It is clearly not enough for me.
Do you know, if possible, how I can configure my IDE to have more active editors opened at the same time ?

There are several words with similar (in some sense) meaning:
&gt; Options, Settings, Properties, Configuration, Preferences

English is not my native language. Could you explain the difference in simple English please? I think the following template could be useful:
&gt; * Use ***XXX*** in your GUI in order to let people change behaviour of your application *(maybe preferences or settings?)*
* Use ***YYY*** in your GUI in order to let people change parts of an object *(perhaps properties or options?)*
* Use ***ZZZ*** in your code ...

What are best practices?

Options, Settings, Properties, Configuration, Preferences — when and why?

I&#39;m using Eclipse (PDT) as primary IDE on different machines. (like at home, laptop, in office, etc.). How could I share the Eclipse and project configuration pragmatically between multiple computers? Should I version control them, or is there any easier way to do this?

How do you ensure to use the same good and old even so up to date config all of your computers?

How to share Eclipse configuration over different workspaces

In my web application I have to send email to set of predefined users like `finance@xyz.com`, so I wish to add that to a `.properties` file and access it when required. Is this a correct procedure, if so then where should I place this file? I am using Netbeans IDE which is having two separate folders for source and JSP files.

Where to place and how to read configuration resource files in servlet based application?

When I **scroll** to the bottom of an open document in the Eclipse **editor**, the last line is at the bottom of the file.  This is a tad annoying when editing code at the **bottom** of the file / screen.

**How can I enable Eclipse to scroll (much like Vim or VS) down far enough that the last line of code reaches the top of the editor window?**

I&#39;m asking for the reverse of this question, in **Eclipse**: https://stackoverflow.com/questions/1747282/how-to-make-visual-studio-editor-stop-scrolling-past-bottom-of-a-file

How can I get Eclipse to scroll past the bottom of the document?

XDebug offers the configuration directive `xdebug.profiler_enable_trigger` that allows to activate profiling by passing the GET or POST parameter &quot;XDEBUG_PROFILE&quot; when calling a script via HTTP. This is handy if you don&#39;t want profiling for ALL of your scripts but only for a few special cases without always changing your PHP configuration.

Is there a way to achieve the same behavior for command line PHP programs? I tried to pass the `XDEBUG_PROFILE` as a command line argument but it didn&#39;t work.

In general, profiling command line PHP works well, but I&#39;d like to have the same per-call-flexibility as with a browser and HTTP server.


How to trigger XDebug profiler for a command line PHP script?

I need to calculate the **time elapsed from one specific date till now** and display it with the same format as StackOverflow questions, i.e.:

    15s ago
    2min ago
    2hours ago
    2days ago
    25th Dec 08

Do you know how to achieve it with the Java **[Joda-Time][1] library**? Is there a helper method out there that already implements it, or should I write the algorithm myself?


  [1]: http://www.joda.org/joda-time/

How to calculate elapsed time from now with Joda-Time?

I want to log in the console or in a file, all the queries that Grails does, to check performance.

I had configured [this][1] without success.

Any idea would help.

  [1]: http://www.grails.org/FAQ#Q:%20How%20can%20I%20turn%20on%20logging%20for%20hibernate%20in%20order%20to%20see%20SQL%20statements,%20input%20parameters%20and%20output%20results?



How to log SQL statements in Grails

In one of controllers in my Grails application I&#39;m preserving a parameter value in a session variable like this:

    session.myVariable = params.myValue

After that, I can access the saved value from different controllers/GSP-pages as long as I actively use the app. However, if I don&#39;t use my app for a while, even though my browser window is still open, the session variable looses it&#39;s value.

Does this happens because the session expires? I was under impression that a session lives until the browser window is still open, but apparently I was wrong.

What should I do to ensure all session variables I define in my Grails app don&#39;t expire until the browser is closed? Is there any way to set session timeout manually?

Thank you in advance for your answers!


How to configure a session timeout for Grails application?

I get the following error when using a primitive attribute in my grails domain object:

    Null value was assigned to a property of primitive type setter of MyDomain.myAttribute
     org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of MyDomain.myAttribute
	at grails.orm.HibernateCriteriaBuilder.invokeMethod(HibernateCriteriaBuilder.java:1077)


Why do I get a &quot;Null value was assigned to a property of primitive type setter of&quot; error message when using HibernateCriteriaBuilder in Grails

In an application I am developing RESTful API and we want the client to send data as JSON. Part of this application requires the client to upload a file (usually an image) as well as information about the image.

I&#39;m having a hard time tracking down how this happens in a single request.  Is it possible to Base64 the file data into a JSON string?  Am I going to need to perform 2 posts to the server? Should I not be using JSON for this?

As a side note, we&#39;re using Grails on the backend and these services are accessed by native mobile clients (iPhone, Android, etc), if any of that makes a difference.

Posting a File and Associated Data to a RESTful WebService preferably as JSON

I usually input command line arguments in Eclipse via run configuration. But I don&#39;t know how do achieve the same task in IntelliJ IDEA.

How do you input command line arguments in IntelliJ IDEA?

In Eclipse if you have a method:

    String MyObject.getValue();

When using this you can go:

    MyObject.getValue(); 

If you cursor is on the line and you hit &lt;kbd&gt;CTRL&lt;/kbd&gt; + &lt;kbd&gt;1&lt;/kbd&gt; you get a context menu to &#39;assign a new local variable&#39;, resulting in the following:

    String value = MyObject.getValue(); 

Can you do this as easily in IntelliJ? I&#39;ve search the net but without success.

What is the IntelliJ shortcut to create a local variable?

Is there a way to create a new class in a desired location without using the mouse in IntelliJ?

I understand there is no keyboard binding in the default keymap. 

How do I create a new class in IntelliJ without using the mouse?

I was using the Java debugger within IntelliJ 8 and noticed a button labeled &quot;drop frame&quot;. Does anybody know what purpose this serves?  How/why would this be used/useful?


When using the Java debugger in IntelliJ, what does &quot;Drop Frame&quot; mean?

When I attempt to run the following test in [IntelliJ IDEA][1] I get the message:

&gt; &quot;!!! JUnit version 3.8 or later expected:&quot;

It should be noted that this is an [Android][2] project I am working on in IntelliJ IDEA 9.

    public class GameScoreUtilTest {
        @Test
        public void testCalculateResults() throws Exception {
            final Game game = new Game();

            final Player player1 = new Player();
            {
                final PlayedHole playedHole = new PlayedHole();
                playedHole.setScore(1);
                game.getHoleScoreMap().put(player1, playedHole);
            }
            {
                final PlayedHole playedHole = new PlayedHole();
                playedHole.setScore(3);
                game.getHoleScoreMap().put(player1, playedHole);
            }
            final GameResults gameResults = GameScoreUtil.calculateResults(game);

            assertEquals(4, gameResults.getScore());
        }
    }

The full stack trace looks like this...

    !!! JUnit version 3.8 or later expected:
    
    java.lang.RuntimeException: Stub!
        at junit.runner.BaseTestRunner.&lt;init&gt;(BaseTestRunner.java:5)
        at junit.textui.TestRunner.&lt;init&gt;(TestRunner.java:54)
        at junit.textui.TestRunner.&lt;init&gt;(TestRunner.java:48)
        at junit.textui.TestRunner.&lt;init&gt;(TestRunner.java:41)
        at com.intellij.rt.execution.junit.JUnitStarter.junitVersionChecks(JUnitStarter.java:152)
        at com.intellij.rt.execution.junit.JUnitStarter.canWorkWithJUnitVersion(JUnitStarter.java:136)
        at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:49)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.intellij.rt.execution.application.AppMain.main(AppMain.java:110)

    Process finished with exit code -3


  [1]: http://en.wikipedia.org/wiki/IntelliJ_IDEA
  [2]: http://en.wikipedia.org/wiki/Android_%28operating_system%29

Content Type	Original Author	Original Content on Stackoverflow
Question	fabien7474	View Question on Stackoverflow
Solution 1 - Configuration	CrazyCoder	View Answer on Stackoverflow
Solution 2 - Configuration	Rajesh Goel	View Answer on Stackoverflow
Solution 3 - Configuration	Supun Sandaruwan	View Answer on Stackoverflow

How to increase the maximum number of opened editors in IntelliJ?

Configuration Problem Overview

Configuration Solutions

Solution 1 - Configuration

Solution 2 - Configuration

Solution 3 - Configuration

What is the difference between supervised learning and unsupervised learning?

How can I read command line parameters from an R script?

Attributions