Bad Major version error – while invoking the webservices.

The below are our softwares we currently use in our application
1) MyEclipse 10 Blue
2) Java development Kit 1.5
3) Websphere 6.1

We tried to install the below Apache Axis2 tools (plug-in) for MyEclipse Blue.

1) Axis 2 Eclipse plug-in – Code Generator
2) Axis2 Eclipse plug-in – Service Archiver.

We downloaded the version 1.6.2 of the tools and we are able to successfully do the below steps.
1) Deploy axis2.war to websphere.
2) Generate the WSDL from the Web Service Class.
3) Generate the Client classes from the WSDL.
4) Generate the .aar file from the client classes and WSDL
5) Deploy the .aar inside Apache Axis2.

When I tried to invoke the services, we got a version conflict, “Bad Minor Version error”. Because the version of the tools(Code generator and Service Archiver) is 1.6.2 which uses JRE 1.6.2. And all our Java code are compiled using JDK 1.5 compiler.
We could change the compiler to 1.6, But Websphere6.1 does not supports Java 1.6.
Also, we are unable to find any Axis2 code generator and service archiver tools of lower version.

We are unable to proceed from this point. If you could help us with some clue to figure out this version conflict or if you can redirect us to a team who uses Apache Axis2 in Websphere 6.1, it would be great.