When using
/s/b/i/jaf/1.1.0/b20/common/activation.jar
in the message queue build classpath using JDK1.4, we get the following error:
You should allow products to still use JDK1.4 with activation.jar
in the build classpath by using the "-target 1.4" option to javac
when generating activation.jar.

javax.activation.DataHandler
bad class file:
/net/redbuild.red.iplanet.com/export/builds/integration/jaf/1.1.0/b20/common/act
ivation.jar(javax/activation/DataHandler.class)
class file has wrong version 49.0, should be 48.0
Please remove or make sure it appears in the correct subdirectory of the
classpath.
import javax.activation.DataHandler;
                        ^
1 error