private boolean checkExistence(final String className) {
        try {
            return Objects.nonNull(this.getParent().loadClass(className));
        } catch (ClassNotFoundException cfe) {
            return false;
        }
    }
checkExistence.

@param className className.
@return existence
shenyu-web/src/main/java/org/apache/shenyu/web/loader/ShenyuPluginLoader.java