Over a million developers have joined DZone.
Platinum Partner

Installing Java 7 on Mac OS X

· Java Zone

The Java Zone is brought to you in partnership with ZeroTurnaround. Discover how you can skip the build and redeploy process by using JRebel by ZeroTurnaround.

While you can download the binaries for Java 7 for Windows and Linux from here, the instructions for setting up Java 7 for Mac OS X are a lot more tedious.

Here are the official instructions for Mac OS X: http://wikis.sun.com/display/OpenJDK/Mac+OS+X+Port

You can follow the instructions line by line and get Java 7 installed on your machine. However, these are the things that might go wrong:

Missing binaries in /bin

The installation expects a bunch of binaries to be present in /bin. However, on my Mac OS X, these binaries were present in /usr/bin/. My workaround was to create symlinks in the /bin directories to make the build happy.

 cd /bin/  
ln -s /usr/bin/sed
ln -s /usr/bin/grep

Repeat the above for each binary that is reported missing in /bin.

Missing jni.h

Make sure that the version of XCode is 3.2.5 or more. I had a 3.2.4 version and that didn’t work.

Building JTReg did not work due to a known bug

It is mentioned in the JTReg build documentation but easy to miss it. The following does not work due to a know bug:

make -C make  

Instead try this:

make -C make build  

Wrong installation directory in the official instructions

The official instructions ask you to do this:

mkdir -p ~/Library/Java/JavaVirtualMachines
cp -R build/macosx-universal/j2sdk-bundle/1.7.0.jdk ~/Library/Java/JavaVirtualMachines

That didn’t work for me. Here’s what worked for me:

   mkdir -p /System/Library/Java/JavaVirtualMachines  
cp -R build/macosx-universal/j2sdk-bundle/1.7.0.jdk /System/Library/Java/JavaVirtualMachines

Finally, setting up env vars

The easiest way to make confirm that Java 7 is successfully installed is:

/usr/libexec/java_home --version 1.7  

The output of the above should be:


Then type ‘java -version’ against the above installation

  /System/Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home/bin/java -version  
openjdk version "1.7.0-internal"
OpenJDK Runtime Environment (build 1.7.0-internal-root_2011_03_16_17_41-b00)
OpenJDK 64-Bit Server VM (build 21.0-b03, mixed mode)

Since I use Java 1.6 on the same machine, I saved the 1.7 path as follows:

   export JAVA7_HOME=/System/Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home  

This lets me conveniently switch to Java7, when I need to, and back:

  export JAVA_HOME=$JAVA7_HOME  

Switch back:

  export JAVA_HOME=$JAVA6_HOME  

Using Java7

Simplest way to use test Java7 is via command line

   export JAVA_HOME=$JAVA7_HOME  
export PATH=$JAVA_HOME/bin:$PATH


  javac Test.java  



java Test 

From http://www.vineetmanohar.com/2011/03/installing-java-7-on-mac-os-x/

The Java Zone is brought to you in partnership with ZeroTurnaround. Discover how you can skip the build and redeploy process by using JRebel by ZeroTurnaround.


{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}