This is a bug already opened. BUT we don't have enough informations about it.
Can you please update the bug entry on SourceForge with the wsdl file, the Eclipse .log file and the steps to follow to reproduce ?
I just downloaded and installed JBossIDE JBossIDE-1.4.1-jre1.5-e31 and I'm using it with Java 5.0. I am still getting this error when trying to create a web service client, but the bug report says it has been closed.
Has this problem reappeared, or is it maybe a config error?