BasicBootstrap 是在 initialize 过程中被实例化的。
1、BasicBootstrap 构造方法中，创建了KernelConfig的子类 ProptyKernelConfig 的实例，并保存到AbstractBootstrap 中。
2、BasicBootstrap 通过 KernelFactory的静态方法 newInstance()创建 Kernerl实例，并保存到AbstractKernelObject 中。
3、ProptyKernelConfig 创建了BasicKernelInitializer实例；
4、BasicKernelInitializer 通过 kernel.getKernelConfig() 即 ProptyKernelConfig ，创建了 Kernel 实例中的所有成员变量并赋值给Kernel的实例。
所有的Kernel 成员变量的类型，定义在 KernelConstants 中：
public interface KernelConstants
{
/** The default kernel name */
static final String KERNEL_NAME = "jboss.kernel:service=Kernel";
/** The default kernel bus name */
static final String KERNEL_BUS_NAME = "jboss.kernel:service=KernelBus";
/** The kernel bus property */
static final String KERNEL_BUS_PROPERTY = KernelBus.class.getName();
/** The default kernel bus implementation */
static final String KERNEL_BUS_CLASS = "org.jboss.kernel.plugins.registry.basic.LifecycleAwareKernelBus";
/** The default kernel config name */
static final String KERNEL_CONFIG_NAME = "jboss.kernel:service=KernelConfig";
/** The default kernel configurator name */
static final String KERNEL_CONFIGURATOR_NAME = "jboss.kernel:service=KernelConfigurator";
/** The kernel configurator property */
static final String KERNEL_CONFIGURATOR_PROPERTY = KernelConfigurator.class.getName();
/** The default kernel configurator implementation */
static final String KERNEL_CONFIGURATOR_CLASS = "org.jboss.kernel.plugins.config.AbstractKernelConfigurator";
/** The default kernel controller name */
static final String KERNEL_CONTROLLER_NAME = "jboss.kernel:service=KernelController";
/** The kernel controller property */
static final String KERNEL_CONTROLLER_PROPERTY = KernelController.class.getName();
/** The default kernel controller implementation */
static final String KERNEL_CONTROLLER_CLASS = "org.jboss.kernel.plugins.dependency.AbstractKernelController";
/** The default kernel event manager name */
static final String KERNEL_EVENT_MANAGER_NAME = "jboss.kernel:service=KernelEventManager";
/** The kernel event manager property */
static final String KERNEL_EVENT_MANAGER_PROPERTY = KernelEventManager.class.getName();
/** The default kernel event manager implementation */
static final String KERNEL_EVENT_MANAGER_CLASS = "org.jboss.kernel.plugins.event.AbstractEventManager";
/** The default kernel initializer */
static final String KERNEL_INITIALIZER_NAME = "jboss.kernel:service=KernelInit";
/** The kernel initializer property */
static final String KERNEL_INITIALIZER_PROPERTY = KernelInitializer.class.getName();
/** The default kernel initializer implementation */
static final String KERNEL_INITIALIZER_CLASS = "org.jboss.kernel.plugins.bootstrap.basic.BasicKernelInitializer";
/** The default kernel registry name */
static final String KERNEL_REGISTRY_NAME = "jboss.kernel:service=KernelRegistry";
/** The kernel registry property */
static final String KERNEL_REGISTRY_PROPERTY = org.jboss.kernel.spi.registry.KernelRegistry.class.getName();
/** The default kernel registry implementation */
static final String KERNEL_REGISTRY_CLASS = "org.jboss.kernel.plugins.registry.basic.BasicKernelRegistry";
/** The default meta data repository name */
static final String KERNEL_METADATA_REPOSITORY_NAME = "jboss.kernel:service=MetaDataRepository";
/** The meta data repository property */
static final String KERNEL_METADATA_REPOSITORY_PROPERTY = KernelMetaDataRepository.class.getName();
/** The default meta data repository implementation */
static final String KERNEL_METADATA_REPOSITORY_CLASS = "org.jboss.kernel.plugins.metadata.basic.BasicKernelMetaDataRepository";
/** The kernel bean validator repository name */
static final String KERNEL_BEAN_VALIDATOR_NAME = "jboss.kernel:service=BeanValidator";
/** The kernel bean validator */
static final String KERNEL_BEAN_VALIDATOR_PROPERTY = KernelBeanValidator.class.getName();
/** The default meta data repository implementation */
static final String KERNEL_BEAN_VALIDATOR_CLASS = "org.jboss.kernel.plugins.validation.basic.BasicKernelBeanValidator";
/** The DependencyBuilder repository name */
static final String DEPENDENCY_BUILDER_NAME = "jboss.kernel:service=DependencyBuilder";
/** The DependencyBuilder property name */
static final String DEPENDENCY_BUILDER_PROPERTY = DependencyBuilder.class.getName();
/** The DependencyBuilder default value */
static final String DEPENDENCY_BUILDER_DEFAULT = "org.jboss.aop.microcontainer.integration.AOPDependencyBuilder:org.jboss.kernel.spi.dependency.helpers.AbstractDependencyBuilder";
}