I would like to use the WatchService API as mentioned in this link:
http://download.oracle.com/javase/tutorial/essential/io/notification.html
After reading around, I found out that WatchService is part of the NIO class which is scheduled for JDK 7. So, it is in beta form. It’s fine.
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http://jdk7.java.net/download.html has the JDK which I downloaded and extracted. I got a bunch of folders. I don’t know what to do with them.
Then, I read around some more and found that some nice group of people created JDK 7 as a binary so someone like me can install it easily. It is called Open JDK:
http://code.google.com/p/openjdk-osx-build/
So, I downloaded the .dmg file and install it. Then I open “Java Preference” and see that OpenJDK7 is available.
So, now I feel that I can start trying out WatchService API. From the tutorial in the first link, the author gave a .java file to test it out first and make sure that it is running. Here is the link to the file:
http://download.oracle.com/javase/tutorial/essential/io/examples/WatchDir.java
So, I boot up Eclipse (actually I use STS) and create a new Java project and choose JaveSE-1.7 in the “use an execution environment JRE:”. Under the src folder, I copy pasted the WatchDir.java file.
And I still see tons of squiggly red lines. All the “import.java.nio.*” are all red and I cannot run it as a Java app.
What do I need to do?
EDIT: I actually did not pursue using Java 7 but there are a lot of interest in it and it seems like people keep answering this question. What should I do to make it more relevant to people who search for it? Let me know by PMing me.
Answers:
Questions:
This is how I got 1.7 to work with Eclipse. I hope it helps.
that should be it ?
Answers:
You can download the Java Development Kit (JDK) for Java 8 for the supported versions of Mac OS X:
Mac Osx 64 Jdk Download Version
Each version of JVM you install can be found here:
For more instructions and FAQ, see this Oracle Guide.
For every release of Java 7 since Update 4, a Mac version has been ready alongside the other platforms. Runs on Macs with 64-bit hardware on Lion (10.7.3+), Mountain Lion (10.8.3+), and Mavericks (10.9.x).
Oracle announced the official release of the JDK for Java SE 7 Update 4 on Mac OS X (Lion), as of 2012-04-26. No more need for the tricks discussed on this page.
Installation is simple per these instructions:
This release has a few limitations, most notably the lack of support for Java Web Start and the Java Plugin for web browsers. That support is expected later this year.
After installing, read the JDK for Mac ReadMe. Most importantly, if you want Java 7 to be the default, drag it to the top of the list in the Java Preferences app found in your Utilities folder.
Mac OS X easily supports multiple JVMs simultaneously. Each is now found here:
Congratulations to the Apple & Oracle teams for their achievement. This geek gets a thrill seeing Mac OS X listed as a “Certified System Configuration“.
Tip: To start Eclipse on a Mac with only Java 7 installed, open the alias file named eclipse rather than the file named Eclipse.app.
Apple continues to supply an up-to-date implementation of Java 6 for all versions of Mac OS X up through Mountain Lion.
If you do something that requires Java, such as type “java -version” in Terminal.app, a dialog appears offering to install Java for you. If you accept, installation happens automatically similar to other “Software Updates” from Apple.
You will find Java installed in this location, different than Java 7 & 8:
Java 6 has reached end-of-life with Oracle as of 2013-02 (unless you have a commercial support agreement with Oracle). So you should be moving to Java 7 or 8.
In Terminal.app, type
java -version to verify which version is the current default.
After installing a fresh version, you may want to visit the folder described above to delete old versions. Move the folder to the Trash, and provide your System password complete the move.
By the way, Apple provides a mailing list for developers’ technical issues related to Java on OS X.
Answers:
An easy way to install Java 7 on a Mac is by using Homebrew, thanks to the Homebrew Cask plugin (which is now installed by default).
Run this command to install Java 7:
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I know that some may want to smack me for re-opening old post, but if you feel so do it I just hope this may help someone else trying to set JDK 7 on Mac OS (using IntelliJ).
What I did to get this working on my machine is to:
Answers:
It’s possible that you still need to add the JDK into Eclipse (STS). Just because the JDK is on the system doesn’t mean Eclipse knows where to find it.
Go to
Preferences > Java > Installed JREs
If there is not an entry for the 1.7 JDK, add it. You’ll have to point Eclipse to where you installed your 1.7 JDK.
If Eclipse can’t find a JRE that is 1.7 compatible, I’m guessing that it just uses your default JRE, and that’s probably still pointing at Java 1.6, which would be causing your red squiggly lines.
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after installing the 1.7jdk from oracle, i changed my bash scripts to add:
and then running
java -version showed the right version.
Answers:
Get cask
Install java7:
(I had difficulty finding the download link of java7 on oracle website, as they’re just “recommending” java8 )
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How about Netbeans, here is an article how to set it up with NB7:
Maybe similar steps for Eclipse.
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As of April 27th there is an offical Oracle release of Java SE 7u4. Download the disk image and run the installer – then see the Mac readme.
Answers:
The instructions by peter_budo worked perfectly. I had to add the jars under /Library/Java/JavaVirtualMachines/JDK 1.7.0 Developer Preview.jdk/Contents/Home/jre/lib/ to my IntelliJ project libraries. Now it works like a charm. Note that I didn’t need my IDE itself to run under 1.7; rather, I only needed to be able to compile and run against 1.7. I’ll most likely continue to use Apple’s JRE for running the IDE since it’s probably more stable with respect to graphics routines (Swing, AWT). Like the OP, I was really keen on testing out the new NIO2 API. Looking good so far. Thanks, Peter.
Answers:
What worked for me on Lion was installing the JDK7_u17 from Oracle, then editing ~/.bash_profile to include:
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_13.jdk/Contents/Home
Answers:
I updated to Yosemite and Android Studio wouldn’t clean my projects or Run them on virtual or real device because of the following error:
After some research and trouble shooting, I found that the JDK file that was being pointed to at “/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home” wasn’t there; all of “JavaVirtualMachines/1.6.0.jdk/Contents/Home” was missing from “/System/Library/Java”. So, I copied “JavaVirtualMachines/1.6.0.jdk/Contents/Home” over from “/Library/Java/” to “/System/Library/Java/” and cha ching! I was back in business.
Tags: osx
This article shows you how to install Java on Mac OSX, and also how to do Java/JDK version switching.
Tested with
Note
On Mac OSX, Java should installed in this folder; it is Mac’s standard.
We will show you two ways to install Java JDK on Mac, via the popular Homebrew package manager and manually installation.
1. Homebrew
1.1 Install Homebrew and update it.
1.2 Add adoptopenjdk/openjdk.
1.3 Find all available JDK.
The output may vary.
1.4 Java 8, 9, 10, 11, 12, 13, choose one to install.
This example will install Java 8 and 11 for testing.
1.5 Where Java is installed?
/usr/libexec/java_home -V
Homebrew will install the JDK at folder
/Library/Java/JavaVirtualMachines/ , and this folder is Mac’s standard folder for Java installs.
1.6 Test it, by default, Mac takes the highest version.
1.7 How to do version switching? Refer to below 3. version switching
2. Manual installation
The example shows you how to download the early access JDK 14 and install it on Mac OSX.
Steps
2.1 Download the early access JDK 14 from the OpenJDK website.
2.2 Extracts tar file to
/Library/Java/JavaVirtualMachines
2.3 Export
JAVA_HOME .
Find out where is JDK 14.
Create or edit the existing
~/.bash_profile with a text editor.
Export
JAVA_HOME , save and exit.
~/.bash_profile
Reflect the changes
2.4 Test it.
3. Version Switching
In this tutorial, we installed the Java 8 and Java 11 via
Homebrew (Step 1), and Java 14 manually (Step 2), so this Mac has three versions now. And the Mac is using the JDK 14.
Note
There are tools like jEnv to manage the Java version switching, but I prefer to manage with export JAVA_HOME manually, it’s simple and easy to understand, no black box magic.
3.1 Create or edit the existing
~/.bash_profile with a text editor like vim or nano, export JAVA_HOME to the specified JDK we want to use on Mac.
The above changes will make
JAVA_HOME point to JAVA 8.
3.2 Reflect the changes.
Done.
If we want to switch JDK version again, update the
~/.bash_profile and export JAVA_HOME to other JDK version.
Jdk Mac InstallReferencesJava Jdk For Mac Download
Tags : beginnerinstall jdkinstall-javamac
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