Spring Boot 菜鸟教程异常集锦

2019-11-10 20:04:36

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异常1.集成SPRing Data JPA

异常信息摘要：

org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Cannot determine embedded database driver class for database type NONE. If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (no profiles are currently active).

异常信息说明：不知道使用什么数据库，需要在pom.xml标注使用什么数据库，如h2 解决思路：修改pom.xml

<dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> <scope>runtime</scope></dependency>

异常2.集成MyBatis没有标注@Mapper注解

异常信息摘要：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'com.jege.spring.boot.mybatis.UserMapperTest': Unsatisfied dependency expressed through field 'userMapper'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean found for dependency [com.jege.spring.boot.mybatis.mapper.UserMapper]: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

异常信息说明：说mapper接口不能成功注入 解决思路：使用spring boot后没有去指定扫描那个包，所以必须标注@org.apache.ibatis.annotations.Mapper在接口类上面或者启动类标注@MapperScan(“com.jege.spring.boot.mybatis.mapper”)

异常3.启动类必须放入包里面

异常信息摘要：

** WARNING ** : Your applicationContext is unlikely to start due to a @ComponentScan of the default package.

异常信息说明：应用程序不能从根目录的包开始 Application.java 文件不能直接放在main/java文件夹下，必须要建一个包把他放进去

异常4.上传文件太大了

异常信息摘要：

org.apache.tomcat.util.http.fileupload.FileUploadBase$FileSizeLimitExceededException: The field upfile exceeds its maximum permitted size of 1048576 bytes.

异常信息说明：默认最大上传大小为1M 解决思路：Spring Boot升级到1.4到这样配置

# MULTipART (MultipartProperties)spring.http.multipart.enabled=true # Enable support of multi-part uploads.spring.http.multipart.file-size-threshold=0 # Threshold after which files will be written to disk. Values can use the suffixed "MB" or "KB" to indicate a Megabyte or Kilobyte size.spring.http.multipart.location= # Intermediate location of uploaded files.spring.http.multipart.max-file-size=10Mb # Max file size. Values can use the suffixed "MB" or "KB" to indicate a Megabyte or Kilobyte size.spring.http.multipart.max-request-size=10Mb # Max request size. Values can use the suffixed "MB" or "KB" to indicate a Megabyte or Kilobyte size.

解决思路：Spring Boot版本1.3.x这样配置

multipart.maxFileSize=10Mb