Archive for February 25th, 2009

‘Revert’ does not mean ‘Reply’

Posted by Bricky in Uncategorized on February 25, 2009

I’ve seen three occurrences of this stupidity recently (all, as it happens, in communications to/from Irish solicitors), and it is really starting to vex me.  Particularly because the people involved should all know better.

Generally, the usage tends to be:

Please revert to me

which, while grammatically correct, only has meaning if the person you are writing to was, at some time in the past, you. Read the rest of this entry »

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Java 1.6 on OS X

Posted by Bricky in Mac on February 25, 2009

Today I was presented with the following error

java.lang.UnsupportedClassVersionError: Bad version number in .class file

My first instinct was of course that I must be using an older vm on the machine in question (an OS X 10.5.6 server), but no, java 1.6 was installed on this machine:

~$ ls -alF /System/Library/Frameworks/JavaVM.framework/Versions/
total 56
drwxr-xr-x  14 root  wheel  476 25 Sep 10:43 ./
drwxr-xr-x  12 root  wheel  408  1 Nov 18:28 ../
lrwxr-xr-x   1 root  wheel    5 25 Sep 10:43 1.3@ -> 1.3.1
drwxr-xr-x   3 root  wheel  102  2 Nov  2007 1.3.1/
lrwxr-xr-x   1 root  wheel    5 25 Sep 10:43 1.4@ -> 1.4.2
lrwxr-xr-x   1 root  wheel    3 16 Jun  2008 1.4.1@ -> 1.4
drwxr-xr-x   8 root  wheel  272 25 May  2007 1.4.2/
lrwxr-xr-x   1 root  wheel    5 25 Sep 10:43 1.5@ -> 1.5.0
drwxr-xr-x   8 root  wheel  272 25 May  2007 1.5.0/
lrwxr-xr-x   1 root  wheel    5 25 Sep 10:43 1.6@ -> 1.6.0
drwxr-xr-x   8 root  wheel  272 16 Jun  2008 1.6.0/
drwxr-xr-x   8 root  wheel  272 25 Sep 10:43 A/
lrwxr-xr-x   1 root  wheel    1 25 Sep 10:43 Current@ -> A
lrwxr-xr-x   1 root  wheel    3 25 Sep 10:43 CurrentJDK@ -> 1.5

A little further investigation revealed that, even though 1.6 is installed, 1.5 is still firmly the default:

~$ java -version
java version "1.5.0_16"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16-b06-284)
Java HotSpot(TM) Server VM (build 1.5.0_16-133, mixed mode)

Thankfully, this can be changed by aliasing java to the 1.6 version:

~$ alias java=/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Commands/java
~$ java -version
java version "1.6.0_07"
Java(TM) SE Runtime Environment (build 1.6.0_07-b06-153)
Java HotSpot(TM) 64-Bit Server VM (build 1.6.0_07-b06-57, mixed mode)

Do this in your .profile to make it stick.

In fact the solution was simpler than the above for me, I just had to put

export JAVA_HOME=/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home

in my tomcat startup script (since I only needed the 1.6 jvm in tomcat).

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