源服务器未能找到目标资源的表示或者是不愿公开一个已经存在的资源表示。 出现这个问题怎么办

请问怎么解决？报错如下：
严重: Servlet [JAX-RS Servlet] in web application [/Fruit-Sales-Platform] threw load() exception
j**a.lang.ClassNotFoundException:
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.j**a:1285)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.j**a:1119)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.j**a:520)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.j**a:501)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.j**a:118)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.j**a:1050)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.j**a:989)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.j**a:4913)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.j**a:5223)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.j**a:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.j**a:752)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.j**a:728)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.j**a:734)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.j**a:1107)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.j**a:1841)
at j**a.util.concurrent.Executors$RunnableAdapter.call(Executors.j**a:511)
at j**a.util.concurrent.FutureTask.run(FutureTask.j**a:266)
at j**a.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.j**a:1149)
at j**a.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.j**a:624)
at j**a.lang.Thread.run(Thread.j**a:748)

哪儿有数据库表啊

为什么MybatisTest中的单元测试我修改了代码，测试的收打印的结果和没改代码打印的结果是一样的？例如：我要查询名字带有“孙”的，打印的结果是我之前没改代码的“李”

第17章的登录模块启动服务出现以下问题
ERROR [localhost-startStop-1] - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘userDaoImpl’: Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void com.fruitsalesplatform.dao.impl.BaseDaoImpl.setSqlSessionFactory(org.apache.ibatis.session.SqlSessionFactory); nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘sessionFactory’ defined in class path resource [beans.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: ‘file [D:\Workspaces\MyEclipse 2017 CI.metadata.me_tcat85\webapps\Fruit-Sales-Platform\WEB-INF\classes\com\fruitsalesplatform\mapper\UserMapper.xml]’; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias ‘com.fruitslaesplatform.entity.User’. Cause: j**a.lang.ClassNotFoundException: Cannot find class: com.fruitslaesplatform.entity.User