Spring Boot 菜鳥教程異常集錦

2019-11-10 17:31:02

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異常1.集成SPRing Data JPA

異常信息摘要：

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).

異常信息說明：不知道使用什么數據庫，需要在pom.xml標注使用什么數據庫，如h2 解決思路：修改pom.xml

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

異常2.集成MyBatis沒有標注@Mapper注解

異常信息摘要：

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)}

異常信息說明：說mapper接口不能成功注入 解決思路：使用spring boot后沒有去指定掃描那個包，所以必須標注@org.apache.ibatis.annotations.Mapper在接口類上面或者啟動類標注@MapperScan(“com.jege.spring.boot.mybatis.mapper”)

異常3.啟動類必須放入包里面

異常信息摘要：

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

異常信息說明：應用程序不能從根目錄的包開始 Application.java 文件不能直接放在main/java文件夾下，必須要建一個包把他放進去

異常4.上傳文件太大了

異常信息摘要：

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

異常信息說明：默認最大上傳大小為1M 解決思路：Spring Boot升級到1.4到這樣配置

# 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.

解決思路：Spring Boot版本1.3.x這樣配置

multipart.maxFileSize=10Mb