downloading java 7 for the mac and a ubuntu linux vm

Main menu:

Topics

Recent Posts

Feeds

RSS Feed RSS - Posts

July 2011
M T W T F S S
« Jun   Aug »
 123
45678910
11121314151617
18192021222324
25262728293031

Past Posts

Java/Java EE

JDBC

Other

downloading java 7 for the mac and a ubuntu linux vm

July 30th, 2011 by Jeanne Boyarsky

I’ve been thinking about setting up a Linux VM on my Mac for a little while now.  I already have a Chrome VM.   While I installed Java 7 on my Mac yesterday from Open JDK, I also wanted an “official” version.  In case I come across anything odd, I want a way to know if it is from the Mac version being not quite ready or “the way things work.”  Which gave me a reason/excuse to install the Linux VM.  This blog entry is about how to get started.

WARNING: Java 7 is not yet production ready.  See Java 7 Ships with Severe Bug.  (it has to do with loops not functioning properly and affects Lucene and likely other things.)

For the Mac

Download and install

  1. Download Java 7 dmg file
  2. Install it
  3. Optional go to Java in system preferences to choose Java 7 as default.  (I did not do this since it sounds experimental with known buts at this point.)
  4. Note the install location to reference is /Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home/bin.

Pointing to Java 7

Since Java 7 has reported stability problems, I didn’t want to set it in my PATH but only use it for selected command line invocations.  To facilitate, I set up the following in my .bash_profile:
alias javac7='/Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home/bin/javac'
alias java7='/Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home/bin/java'

To validate the aliases are working:

Jeanne-Boyarskys-MacBook-Pro:~ nyjeanne$ javac7 -version
javac 1.7.0-internal
Jeanne-Boyarskys-MacBook-Pro:~ nyjeanne$ java7 -version
openjdk version "1.7.0-internal"
OpenJDK Runtime Environment (build 1.7.0-internal-b00)
OpenJDK 64-Bit Server VM (build 21.0-b17, mixed mode)

Linux VM on VirtualBox

Download and install

  1. Download ubutntu iso file.   It took a number of hours to download the iso file.  (I let it run overnight.)  While the download was less than 100MB, I downloaded Lion the night before (over 3GB) so my ISP may be throttling my connection speed now.  That or a slow server.  Note that you don’t need to create a USB stick or CD.  Just the iso file is fine.
  2. Create a new VirtualBox VM and set CD drive to read from the downloaded iso file.  Even those these instructions are for Windows, they were easy to follow on a Mac.
  3. Try to downloadthe .tar.gz file for Java 7.  I got a page not found so I tried the .rpm file.  This gave me errors when I installed and tried to run it.
     javac -version gave:
    Error occurred during initialization of VM.  java/lang/NoClassDefFoundError: java/lang/Object
  4. Deleted the bad install.
  5. Tried again to download the .tar.gz file for Java 7.  This time the path was found.

Pointing to Java 7

Since my Linux machine is a VM specifically for trying Windows 7, I felt safe adding it to the beginning of my PATH in the .profile file.

A really simple Java program

A really simple program using a Java 7 feature to further test your setup.

<pre>import java.util.*;

public class JeanneTest {
  public static void main(String... args) {
    System.out.println("test");
    Set<String> test = new HashSet<>();
  }
}

Comments

Comment from anonymous
Posted: August 1, 2011 at 5:51 pm

MHO
I would not use the word ‘test’ anywhere in the program. Bash and Mysql are but a few apps that use this as a default. Your usage is perfectly OK, however, on the safe side I would modify this word.

Comment from Jeanne Boyarsky
Posted: August 1, 2011 at 7:11 pm

The word “test” is used in a Java program, not in a shell script. Bash/mysql are not executing it, so it is fine. I disagree that avoiding reserve words/commands from another language should be avoided when you are not in that language.

Pingback from virtualbox between mac lion and ubuntu | Down Home Country Coding With Scott Selikoff and Jeanne Boyarsky
Posted: August 14, 2011 at 8:38 pm

[…] downloading java 7 for the mac and a ubuntu linux vm […]

Write a comment