One of the most widely anticipated features for JDK 8 has been the inclusion of lambda expressions into the language. If you're like me, you've been eagerly following this since before JDK 7 was released. I got my hunger satisfied by using lambda expressions in C# on projects since early betas of .NET 3.5 in 2007 and would eagerly follow Brian Goetz's articles on the state of the lambda and anything else I could get my hands on, I really have wanted lambdas in Java for so long.

1. JavaFX 8 is bundled with JDK 8 for Windows, Mac and Linux. Unlike previous versions of NetBeans IDE, NetBeans IDE 8.2 does not require that you set up an 'FX-enabled' Java platform in order to utilize JavaFX support in the IDE. You can develop JavaFX projects in the IDE if you install JDK 8.
2. While NetBeans does work well with JDK 8, I have had some rendering issues, it could be due to being on a mac, I don't know. But for me I always point it to JDK 7. I recommend doing this until the final release of both JDK 8 and NB 8. To do this you will need to locate the etc/netbeans.conf file within your NetBeans installation.
3. Steps to Install NetBeans 8.2 on macOS Mojave After completing the download, double click the file named “ netbeans-8.2-javase-macosx.dmg ” in the download folder to extract. Then you will get the file named “ NetBeans 8.2.pkg “, double click on it to start the installation. The window will display as shown in the below image.
4. Link to How to install Java JDK on Mac OS XVideo tells you how to download Netbeans IDE for Mac OS X.In this tutorial, we wi.

Now I'm so excited to start using them! I can see JDK 8 being released and have started migrating projects on a jdk8 branch which will be ready to be snapped into production as soon as the JDK is officially released, I strongly advise everyone to do the same, you will love the new support.
There are several new features coming with JDK 8, of which I'm going to cover a small subset of what I believe will be the most widely used by consumer developers, see the full JDK 8 feature list for more.

NetBeans IDE lets you quickly and easily develop Java desktop, mobile, and web applications, as well as HTML5 applications with HTML, JavaScript, and CSS. Batch analyzers and converters are provided to search through multiple applications at the same time, matching patterns for conversion to new Java 8 language constructs.

• JSR-335 - Lambda Expressions and associated library improvements such as bulk data operations for collections.
• JSR-310 - Date and Time API.
• NetBeans tooling to help migrate to JDK 8
• Maven based project

For the conversion we'll be using NetBeans, quite simply because IMHO it is the best IDE for Java development, if you haven't tried it in a while you're in for a heck of a treat (sorry eclipse). I've been using it since 2002 of which the team has always responded quickly to change and bug submissions. The upcoming 8.0 version has full support for JDK 8 and an awesome tool that will analyse your project and convert (with your permission) blocks of code to JDK 8 equivalents all in one bulk migration operation, this is what we're going to use. Download the Beta 8 version or the nightly build.
NetBeans comes with all you will need to get the job done, but you will also need a copy of the latest JDK 8 EA which can be downloaded here.
I converted two distinct projects, one was a super project containing 20 child projects that represent domains within our business such as sales, product, scheduling... The second project is a spring/mvc 3 project for our in house FSA/CRM/portal system used by all members of the company that relies on the 18 libraries in the first project.
I use maven/git from the command line a lot, but that's a personal preference. NetBeans has great support for both, but I just type faster than I can click.
At the time I performed the conversion I was using the nightly build of NetBeans (Build 201401260001) and JDK8 (build 1.8.0-ea-b124).
While NetBeans does work well with JDK 8, I have had some rendering issues, it could be due to being on a mac, I don't know. But for me I always point it to JDK 7. I recommend doing this until the final release of both JDK 8 and NB 8. To do this you will need to locate the etc/netbeans.conf file within your NetBeans installation. On a mac this is slightly different. Refer to the following default locations where your netbeans.conf may reside:

• Windows: c:program filesnetbeansetcnetbeans.conf
• Mac: /Applications/NetBeans/NetBeans 8.0 Beta.app/Contents/Resources/NetBeans/etc/netbeans.conf
• Linux: /opt/netbeans/NetBeans 8.0 Beta/etc/netbeans.conf

At around line 57 there's a line for setting the JDK, on my platform it needed to be set as follows for JDK 7.
NOTE: If you have previously used a dev build of NetBeans, it's best to delete your dev userdir, this can be found in ~/netbeans/dev on linux, ~/Library/Application Support/NetBeans/dev/ for mac, I'm not sure where in windows.
Now start NetBeans, we will need to then add the Java 8 JDK to NetBeans. Go to [Tools > Java Platforms], from here add your installed Java 8 JDK.
One thing I actually forgot to do when first writing this post was to update the JDK on my tomcat container. I found this out after exceptions started appearing when debugging locally. All servlet containers are configured similarly, thought he JDK setting is in slightly different places. All servers can by configured by either right clicking the server in the Services (CMD+5 on Mac) within the servers node or by accessing the Tools > Servers menu option.
I have only covered Glassfish and Tomcat as they are the standard containers that come with NetBeans, if you have another container try poking about until you find the setting.

Tomcat

Tomcat's configuration is found under the 'Platform' tab. The 'Java Platform' configuration option controls which JDK is used.

Glassfish

Glassfishes configuration is found under the 'Java' tab. The 'Java Platform' configuration option controls which JDK is used.
First thing to do is for each project update the JDK and source version. This can be done by right clicking the project and clicking 'Properties'.
You will need to first set the JDK under 'Build > Compile', set the 'Java Platform' to 'JDK 1.8'.
Next go to 'Sources' and set the 'Source/Binary Format' to 1.8.
NetBeans would do the following:

• Add or update the maven-compiler-plugin version to 1.8
• Create or modify the nb-configuration.xml file setting netbeans.hint.jdkPlatform to JDK_1.8

You may wish to alter your pom.xml file directly, for me I actually have a property version-java-target in my pom.xmlproperties section that defines the 1.8 java version. The use of the nb-configuration.xml file gives the IDE a hint as to which JDK it should use, maven from the command line will use the setting of JAVA_HOME, but NetBeans may have more than one JDK configured so has to somehow figure out which one to use.
NetBeans first looks at nb-configuration.xml for the JDK hint (netbeans.hint.jdkPlatform), if it can't find it there it will look at the pom.xml file for the property of the same name. If you do want to control this yourself you may edit the pom.xml directly but remember to reload the project (right click > Reload POM) to reload the new configuration.
TIP: If later you find that you are creating JDK 8 specific code but the IDE tells you your source level does not permit this, yet checking the project configuration tells you it's all set for JDK 8 and source level 1.8, chances are you have a nb-configuration.xml file and pom.xml conflict with netbeans.hint.jdkPlatform, in this case the nb-configuration.xml file wins. This caught me out where a child project was involved. Basically NetBeans was telling me the configuration from the parent pom.xml file, yet the child projects had a nb-configuration.xml file that was conflicting.

Jdk For Netbeans 8

At this point you will need to update the project JDK on your CI/build server before pushing your changes if you wish to avoid build failures.
Repeat this for your other projects you will be upgrading.
TIP: If you are working with a super pom and child projects, I suggest the following:

1. Remove all nb-configuration.xml files (look at them first), i.e. find . -type f -name nb-configuration.xml -delete.
2. If any child project contains a maven-compiler-plugin build plugin, remove it.
3. In your parent pom add the plugin management with default settings which will get picked up by child projects, refer below.
4. Set the JDK version in your properties section.

Build your project within the IDE (SHIFT+F11), if all goes well, send it off to your DEV CI server. You should be right to use new language features.
Now that you've configured all projects I advise testing that the project is in fact being picked up by the IDE as a JDK 1.8 project, as noted above I had issues where this was not. It's simple to test, just open a class and add the following:
If your editor shows an error like the following, the project isn't picking up the Java 8 JDK sometimes it's necessary to close the IDE and open again to get it to recognise the new JDK settings for the project. If it isn't showing an error, then it's time to get excited!
NetBeans has a highly customisable configuration for the way code is formatted, which can be specified globally and per project. To configure settings globally Go to NetBeans Preferences (Mac: NetBeans > Preferences, Windows/Linux: Tools > Options) > Editor > Formatting > Java. Browse through all the available settings and get these the way you like them. I advise doing this now as later we will be converting a lot of source files automatically at once which will use these settings.
This is by far the most super-cool^TM feature that will hunt down potential JDK 8 conversions that can be applied to your source files. It will present a list of all found changes with diff's allowing you to accept each individual change. This is truly cool.
TIP: Note that this can do more than just convert to JDK 8, have a look at the configurations and see what else you might like it to find/fix for you.
Start by selecting a project node, you can right click and select 'Inspect and Transform...' or go to [Refactor > Inspect and Transform...]. Select the 'Configuration' radio button and change the selection to 'Migrate to JDK 8'.
At this point you can customise how the migration assistant works by hitting the 'Manage...' button, I highly recommend you do this; my tip is to turn OFF the 'Static Imports' setting. There's a good reason for this which is illustrated here.
Consider this fairly useless piece of code, though it's functional that it shows how something can go awry.
With static imports on the migration tool will produce the following invalid class file.
Notice here that the code produced now has a conflict between the two static methods.

Jdk For Netbeans 8 2 Mac Download

Back to our migration assistant, hit Inspect. The inspector may take some time depending on the size of your project. Once complete you may have a warning where more than one fix can be applied, if this is the case take note of where and just hit 'Inspect'.
You should now have a diff open up within the output window area titled 'Refactoring'. From here you can review all refactorings that have been identified by the IDE. Give each one a review and un-tick if you do not want that particular action to be taken. Once satisfied hit the 'Do Refactoring' button.
All your selected refactorings will have now been applied. First before continuing just ensure the project compiles by performing another clean and build (SHIFT+F11).

Clean up Source Files

While the JDK 8 migration tool is completely awesome, you may want to review all files and give them a polish. There's a few things that I found that I wanted to do when reviewing my sources:

1. Lambdas now removed a lot of anonymous classes, therefore their import statements can now also be removed. To fix this, open each file and simply hit [Source > Fix Imports...].
2. Lambdas in most cases can type infer the arguments. I personally prefer this as IMHO less is more when it comes to readability. Simply find any lambda arguments and remove the type. Note that sometimes this can't be done as the compiler may not know which method is being called for example.
3. Lambdas do not require a body, which NetBeans prefers. However I found that in some (minor) cases it's actually more readable when there is a body.
4. The refactoring sometimes ends up on very long lines, especially where the lambda has no body. I found it far easier to read by going through every lambda and breaking them out a little.

Check out Some Hints

NetBeans has more to offer with migrating to JDK 8. For example it can convert a for loop to a map/reduce stream. Sometimes this may not be ideal though, consider the following:
If we were to accept the hints suggestion and convert, it would be more of a horizontal problem:
Which if fully converted should actually look like the following:
To stop this hint appearing all the time, configure it to only appear on current line.
Java now comes with a great date/time library out of the box, so you don't need to worry about JodaTime, which served a need for many years. Fortunately Java Time (JSR-310) uses similar class names to that of JodaTime, which will make your life slightly easier in the fact that some source files will just need the references changed from org.joda.time.* to java.time.*. Choosing to upgrade to java-time or continue using Joda or java.util.Date/java.util.Calendar is up to you, but I advise doing it sooner than later. Updating is a matter of going through and performing manual conversion unfortunately.
What I will describe is what you might need to do to get jsr-310 working with Jackson and spring.
As with joda-time, it comes as a separate jackson module. Add the following to your pom.xml
As for spring there are a number of ways this is done, if you are using joda already, use that same class/configuration, but also add com.fasterxml.jackson.datatype.jsr310.JSR310Module with the registerModule method just as you would with joda. For example, this is the configuration I use:

Custom object mapper class

Spring MVC servlet context configuration

Here I've shown you how you can quickly migrate your project to JDK 8 fairly painlessly with the aid of the awesome tools that come with the NetBeans IDE that help to perform this migration. I really tip my hat off to the team as this was a nice surprise that I thought I was going to have to convert everything on a per case.
Have a look at my second article The Power of the Arrow for some of my more interesting lambdas.

NetBeans (@ http://netbeans.org) is an open-source Integrated Development Environment (IDE). NetBeans began in 1996 as a Java IDE student project at Charles University in Prague. Sun Microsystems acquired NetBeans in 1999. In 2010, Oracle acquired Sun (and thus NetBeans).

Compared with its rival Eclipse (http://www.elicpse.org) (both are open-source, so I don’t know what are they competing for?), NetBeans provides seamless support for Java AWT/Swing, Java ME mobility pack, Java EE, and bundled with an excellent profiler for performance tuning.

NOTE (2018 Feb 01): NetBeans 8.2 might not work with JDK 9 at this moment. Stick to JDK 8 now, if you want to use NetBeans.

1. How to Install NetBeans 8.2

1.1 How to Install NetBeans on Windows

Step 1: Install JDK

To use NetBeans for Java programming, you need to first install Java Development Kit (JDK). See “JDK – How to Install“.

Step 2: Download

Download “NetBeans IDE” installer from http://netbeans.org/downloads/index.html. There are many “bundles” available. For beginners, choose the 1st entry “Java SE” (e.g., “netbeans-8.2-javase-windows.exe” 95MB).

Step 3: Run the Installer

Run the downloaded installer.

1.2 How to Install NetBeans on Mac OS X

To use NetBeans for Java programming, you need to first install JDK. Read “How to install JDK on Mac“.

To install NetBeans:

1. Download NetBeans from http://netbeans.org/downloads/. Set “Platform” to “Mac OS X”. There are many “bundles” available. For beginners, choose “Java SE” (e.g., “netbeans-8.2-javase-macosx.dmg” 116MB).
2. Double-click the download Disk Image (DMG) file.
3. Double-click the “NetBeans 8.x.mpkg“, and follow the instructions to install NetBeans. NetBeans will be installed under “/Applications/NetBeans“.
4. Eject the Disk Image (“.dmg“).

You can launch NetBeans from the “Applications”.

Notes: To uninstall NetBeans, drag the “/Applications/NetBeans” folder to trash