Open GuidoPaul opened 8 years ago
Hi,这个问题有解决方案? 尝试加了:restart.include.mybatiscommon=/mapper-[\w-]+.jar到spring-devtools.properties 还是无效。
问题确认: selectByPrimaryKey(xx)返回的对象是来源于AppClassLoader,其它因为配置了devtools使用了RestartClassLoader。 使用mybatis自定义查询方法返回的对象也是来源于RestartClassLoader.
@tsball
你这应该是正则表达式的问题,需要匹配的是 mapper-3.3.9(当前引入的版本号).jar
试试 restart.include.mybatiscommon=/mapper-\\d+(\\.\\d+){0,2}.jar
http://stackoverflow.com/questions/826319/classcastexception-when-casting-to-the-same-class 我也遇到了这种问题,查找了半天,还是不能解决
@noob9527
我用了你的那个配置还是不行,直接启动就报错,这是我的pom.xml:
`<?xml version="1.0" encoding="UTF-8"?>
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<!--数据库-->
<ojdbc.version>12.1.0.1</ojdbc.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--添加对web的支持-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--zuul-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zuul</artifactId>
<version>1.2.5.RELEASE</version>
</dependency>
<!--Spring Boot Actuator-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!--开发环境的调试修改实时生效-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
<!--mybatis-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.2.0</version>
</dependency>
<!--mapper-->
<dependency>
<groupId>tk.mybatis</groupId>
<artifactId>mapper-spring-boot-starter</artifactId>
<version>1.0.0</version>
</dependency>
<!--druid-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.11</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
<!--test-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<scope>test</scope>
</dependency>
<!--oracle-->
<dependency>
<groupId>oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>${ojdbc.version}</version>
</dependency>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
这是启动报错信息:
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-02-15 17:11:48.602 ERROR 6332 --- [ restartedMain] o.s.boot.SpringApplication : Application startup failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.github.pagehelper.autoconfigure.MapperAutoConfiguration': Invocation of init method failed; nested exception is java.lang.RuntimeException: tk.mybatis.mapper.provider.EmptyProvider中缺少selectOne方法! at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:137) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:409) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1620) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) at com.example.Application.main(Application.java:25) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) Caused by: java.lang.RuntimeException: tk.mybatis.mapper.provider.EmptyProvider中缺少selectOne方法! at tk.mybatis.mapper.mapperhelper.MapperHelper.fromMapperClass(MapperHelper.java:159) at tk.mybatis.mapper.mapperhelper.MapperHelper.registerMapper(MapperHelper.java:173) at tk.mybatis.mapper.mapperhelper.MapperHelper.registerMapper(MapperHelper.java:179) at tk.mybatis.mapper.mapperhelper.MapperHelper.registerMapper(MapperHelper.java:179) at tk.mybatis.mapper.mapperhelper.MapperHelper.registerMapper(MapperHelper.java:179) at tk.mybatis.mapper.mapperhelper.MapperHelper.registerMapper(MapperHelper.java:179) at com.github.pagehelper.autoconfigure.MapperAutoConfiguration.addPageInterceptor(MapperAutoConfiguration.java:64) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:366) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:311) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:134) ... 23 common frames omitted `
@workcheng 去掉 devtool 就行,上面的配置不行,你要排除的类是你自己实体所在的 jar 包,这么配置也不方便。
这个问题解决方式只能在pom.xml中去掉 devtool吗?是否还有其他方式?
@yanghdx
spring boot dev-tool
对第三方jar包使用"base" class loader
对IDE project目录下的Class使用"restart" class loader
restart.include.mybatiscommon=/mapper-\\d+(\\.\\d+){0,2}.jar
这行配置是告诉devtool使用"restart" class loader 来加载mapper jar包中的类,一般来说这样就可以解决问题了。
@noob9527 添加配置后,pagehelper 报错。信息是: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.github.pagehelper.autoconfigure.MapperAutoConfiguration': Invocation of init method failed; nested exception is java.lang.RuntimeException: tk.mybatis.mapper.provider.EmptyProvider中缺少selectOne方法!
@yanghdx 这是通用 Mapper 报错。。
我这么配置是好使的(正则就是匹配mybatis、mapper、pagehelper开头的全部,比较暴力一些) restart.include.pagehelpercommon=/pagehelper..jar restart.include.mybatiscommon=/mybatis..jar restart.include.mappercommon=/mapper.*.jar
问题重现
pom.xml 中添加 `
`
运行 spring-boot:run 点击 修改 操作,如访问http://localhost:8181/countries/view/1,出现java.lang.ClassCastException: tk.mybatis.springboot.model.Country cannot be cast to tk.mybatis.springboot.model.Country