当我的EbookService中，
criteria.andNameLike("%"+req.getName()+"%"); 这句代码是**req.getName()**时，就没事。

可如果变成：
criteria.andNameLike("%"+req.getId().toString()+"%"); 这里是**req.getId()**的话，就会报下面的错误

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
47.005 ERROR o.s.boot.SpringApplication    :830  restartedMain                    Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'ebookController' defined in file [D:\kai_fa_qu\project\wiki\target\classes\com\zzp\wiki\controller\EbookController.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [com.zzp.wiki.controller.EbookController] from ClassLoader [org.springframework.boot.devtools.restart.classloader.RestartClassLoader@75dbcdb4]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:597)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:953)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:740)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:415)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
	at com.zzp.wiki.config.WikiApplication.main(WikiApplication.java:28)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: java.lang.IllegalStateException: Failed to introspect Class [com.zzp.wiki.controller.EbookController] from ClassLoader [org.springframework.boot.devtools.restart.classloader.RestartClassLoader@75dbcdb4]
	at org.springframework.util.ReflectionUtils.getDeclaredFields(ReflectionUtils.java:743)
	at org.springframework.util.ReflectionUtils.doWithLocalFields(ReflectionUtils.java:675)
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.buildResourceMetadata(CommonAnnotationBeanPostProcessor.java:377)
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.findResourceMetadata(CommonAnnotationBeanPostProcessor.java:358)
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessMergedBeanDefinition(CommonAnnotationBeanPostProcessor.java:306)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyMergedBeanDefinitionPostProcessors(AbstractAutowireCapableBeanFactory.java:1116)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594)
	... 18 common frames omitted
Caused by: java.lang.NoClassDefFoundError: com/zzp/wiki/service/EbookService
	at java.base/java.lang.Class.getDeclaredFields0(Native Method)
	at java.base/java.lang.Class.privateGetDeclaredFields(Class.java:3297)
	at java.base/java.lang.Class.getDeclaredFields(Class.java:2371)
	at org.springframework.util.ReflectionUtils.getDeclaredFields(ReflectionUtils.java:738)
	... 24 common frames omitted
Caused by: java.lang.ClassNotFoundException: com.zzp.wiki.service.EbookService
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Class.java:467)
	at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.loadClass(RestartClassLoader.java:145)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
	... 28 common frames omitted
　　        ＿＿

这是为什么？