Add some checks to see if the correct classes are present
Add some checks to see if the correct classes are present

git-svn-id: https://svn.apache.org/repos/asf/jakarta/jmeter/trunk@602496 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: 709cad36006027f8ba2d544e23c0fcabf42ac5e7
apache/jmeter,ham1/jmeter,etnetera/jmeter,apache/jmeter,benbenw/jmeter,apache/jmeter,benbenw/jmeter,ham1/jmeter,benbenw/jmeter,benbenw/jmeter,etnetera/jmeter,etnetera/jmeter,apache/jmeter,etnetera/jmeter,ham1/jmeter,apache/jmeter,ham1/jmeter,ham1/jmeter,etnetera/jmeter