private boolean isPatchJar(String jarFilename) {
		if ("jar".equals(FilenameUtils.getExtension(jarFilename))) {
			for (String jarName : patchJarList) {
				if (jarFilename.contains(jarName)) {
					return true;
				}
			}
		}
		return false;
	}
Construct the classpath of ngrinder which is very important and located in the head of
classpath.

@param classPath classpath string
@param logger    logger
@return classpath optimized for grinder.
ngrinder-core/src/main/java/net/grinder/util/AbstractGrinderClassPathProcessor.java