Yes, it is an illuminating start to a long stack trace, isn't it? (That's why I put it in the title of this blog entry, hoping to draw frustrated Googlers here, so they can see for themselves what the solution is.) So here's hoping that Google will bring you to this blog entry, because (good news!) ALL YOU NEED TO DO IS PUT JAVA_HOME/BIN ON THE CLASSPATH! (Read more here which is where I found this tip.) IntelliJ people might also benefit from this knowledge, as evidenced here:
So, to reiterate, in JDK 6.x, you need JAVA_HOME/bin on the classpath (not just JAVA_HOME, as was the case with JDK 5.x), otherwise you'll get a nightmarish stack trace instead of your wonderful web service payload retrieved from the web.