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How to install JDK 8 on OS X Mountain Lion with new lambda features

Can someone help me with installing JDK 8 on Mac Mountain?

I installed java_for_os_x_2013002_dp__11m4203.dmg and I see: /Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home . But I don’t know what else needs to be done.

How can I make a symbolic link to the new version and so on?

I use Eclipse and maven, so I do not want a conflict with them. I am a new Mac user.

JDK 7 is already installed on my Mac, but I just want to experiment a bit with the new lambda expression.

thanks for the help

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2 answers

If you just want to try coding with JDK8, you do not need to install it on your system. Just like the JRE in the eclipse version with Java 8 support. To get the eclipse beta build, you can create it yourself (I had problems with this) or download a pre-built version. I could not find any ready-made versions on the eclipse website, but I found it here. http://downloads.efxclipse.org/eclipse-java8/

Once you have downloaded, go to Eclipse> Preferences> Java> Installed JREs Click Add and specify the java 8 home directory. For me it was /Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home.

Now create a project. Source level 1.8 is not available in the user interface, you need to change <my_project>/.settings/org.eclipse.jdt.core.prefs and make sure you have the lines below.

 org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8 org.eclipse.jdt.core.compiler.compliance=1.8 org.eclipse.jdt.core.compiler.source=1.8

Then you will be fine.

Building eclipse is a beta, so code support does not always work with the new syntax. But it compiles and runs java 8 code :-)

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Although the EKG answer explains well what you need to do to start the Java 8 project, if you want Java 8 to be your default version on the system, you can install it as the Java home.

I (previously for maven) had the following line added to my .profile to install my Java home.

export JAVA_HOME = $ (/ usr / libexec / java_home)

Now, to install it in a specific version, I updated it to the next value

export JAVA_HOME = $ (/ usr / libexec / java_home -v 1.8)

This allows you to install a specific version as by default, but how to update the default value for the entire system (each user who did not install it on their own) still eludes me.

Note. I know that this is not a direct answer, but this is what people will come to when they are looking for it. Alas, this is too big to write in the comments. If this “answer” is better represented in another way, I would be happy to make a change.

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