This patch implements the jmx.invoke.getters behavior like description from JMX 1.2 specification:

"In the JMX 1.2 specification, it is forbidden to call getters and setters via invoke.
Previously, an implementation was free to choose whether or not to allow this.
However, if the property jmx.invoke.getters does not have an empty value, the
code forbidding calling getters and setters through invoke is disabled."

This form this patch fix the JBAS-1930 too.