关于SpringBoot启动访问出现Whitelabel Error Page问题

springboot是以注解驱动，启动的，常用注解方式配置如下：

第一种方式组合注解：

@EnableAutoConfiguration
@ComponentScan(basePackages = "xxx.xx.xx")

第二种方式单注解（前提是启动项必须放在包根目录下，否在会出现最上边问题）：

@SpringBootApplication

特殊情况即使用@SpringBootApplication注解，又未将启动项放置根目录下则会导致最上边问题，解决方法如下图使用组合注解：

@SpringBootApplication
@ComponentScan(basePackages = "xx.xx.xx")

本人习惯直接将启动项放置根目录，仁者见仁智者见智。解决问题就好。

附

@SpringBootApplication注解

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(excludeFilters = {
		@Filter(type = FilterType.CUSTOM, classes = TypeExcludeFilter.class),
		@Filter(type = FilterType.CUSTOM, classes = AutoConfigurationExcludeFilter.class) })
public @interface SpringBootApplication {

	/**
	 * Exclude specific auto-configuration classes such that they will never be applied.
	 * @return the classes to exclude
	 */
	@AliasFor(annotation = EnableAutoConfiguration.class)
	Class[] exclude() default {};

	/**
	 * Exclude specific auto-configuration class names such that they will never be
	 * applied.
	 * @return the class names to exclude
	 * @since 1.3.0
	 */
	@AliasFor(annotation = EnableAutoConfiguration.class)
	String[] excludeName() default {};

	/**
	 * Base packages to scan for annotated components. Use {@link #scanBasePackageClasses}
	 * for a type-safe alternative to String-based package names.
	 * @return base packages to scan
	 * @since 1.3.0
	 */
	@AliasFor(annotation = ComponentScan.class, attribute = "basePackages")
	String[] scanBasePackages() default {};

	/**
	 * Type-safe alternative to {@link #scanBasePackages} for specifying the packages to
	 * scan for annotated components. The package of each class specified will be scanned.
	 * 

	 * Consider creating a special no-op marker class or interface in each package that
	 * serves no purpose other than being referenced by this attribute.
	 * @return base packages to scan
	 * @since 1.3.0
	 */
	@AliasFor(annotation = ComponentScan.class, attribute = "basePackageClasses")
	Class[] scanBasePackageClasses() default {};

}