Sunday, July 5, 2009

Ant, SCP and EC2

I've have had to deal with a strange set of circumstances

1. No ant-jsh.jar in my deployment

I got the error


Deploy.ant.xml:57: Problem: failed to create task or type scp

Cause: the class was not found.

This looks like one of Ant's optional components.

Action: Check that the appropriate optional JAR exists in



-a directory added on the command line with the -lib argument

Do not panic, this is a common problem.

The commonest cause is a missing JAR.

This is not a bug; it is a configuration problem

Turns out that the default deployment of Ant (1.7) did not contain this jar on Mac OS-x 10.5. So I had to do two things

  1. Download the binary distribution of Ant 1.7, unpack the jar and copy ant-jsch.jar to /usr/share/ant/lib
  2. Download the implementation of the SSH java code from JCraft and copy it to /usr/share/ant/lib

2. I still can't SCP to EC2

So I know I can scp -i to this EC2 host, but the following Ant task fails

<scp localfile="dba.war"





/Volumes/Develop/Develop/Projects/HarpoonDeployMK9a/Deploy.ant.xml:57: neither password nor passphrase for user root has been given. Can't authenticate.

Turns out that you need the following in the SCP task for it to work with EC2



The passphrase that worked happened to be my password for my AWS account...

Friday, July 3, 2009

End of life... Oh Amazon stop making me do work!

So, like many early adopters I have the pain of being an early adopter. The most recent is the delightful email I got from Amazon.

Dear Amazon SQS Customer,

This is a friendly reminder about the upcoming deprecation and end-of-life for the Amazon SQS 2006/2007 WSDL.

Talk about a "Dear John" letter. In the end it was not much work, just needed to download the latest version of Typica 1.5.2a and then change

The only problem so far is that the old version of Typica (0.8) included in the jar ch.inventec.Base64Coder.class which is need to run. I resorted to including the old Typica jar on the class path after a fruitless search for this class elsewhere.

So I'm no back running with the new WSDL and a happier Jeff Bezos.

Now I just have to rip out the code that did on demand scaling and load balancing...