Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=55357
Merged revision 1514281 from tomcat/trunk:
Set the web app classloader as a context classloader before reading the object data.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1514455 13f79535-47bb-0310-9956-ffa450edef68