针对SpringBoot项目启动报错"Error starting ApplicationContext...."的解决办法,可以从以下几个方面入手:
1.检查POM文件依赖
首先需要检查POM文件中的依赖是否正确。有时候项目依赖的jar包版本或者相互的依赖关系不正确,会导致项目启动失败。可以采用以下方式排查:
1.使用mvn dependency:tree
命令查看项目的依赖树,检查是否存在版本冲突或者缺失的依赖。
2.使用mvn dependency:analyze
命令检查是否有冗余的依赖,如果存在可以手动排除。
例如,假设项目启动报错如下:
org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: URL [jar:file:/D:/project/springboot/target/springboot-1.0.0-SNAPSHOT.jar!/BOOT-INF/classes!/com/example/springboot/demo/model/User.class]; nested exception is java.io.FileNotFoundException: class path resource [com/example/springboot/demo/model/User.class] cannot be opened because it does not exist
这种情况通常是因为缺少某个依赖的问题,可以使用以下命令查看项目中缺失的依赖:
mvn dependency:tree
如果出现了类似下述错误信息,则说明缺少了Spring Data JPA相关依赖:
[INFO] +- org.springframework.boot:spring-boot-starter-data-jpa:jar:2.2.4.RELEASE:compile
[INFO] | +- org.springframework.boot:spring-boot-starter-aop:jar:2.2.4.RELEASE:compile
[INFO] | | \- org.aspectj:aspectjweaver:jar:1.9.5:compile
[INFO] | +- jakarta.transaction:jakarta.transaction-api:jar:1.3.3:compile
[INFO] | +- jakarta.persistence:jakarta.persistence-api:jar:2.2.3:compile
[INFO] | +- org.hibernate:hibernate-core:jar:5.4.10.Final:compile
[INFO] | | +- org.jboss.logging:jboss-logging:jar:3.4.1.Final:compile
[INFO] | | +- javax.persistence:javax.persistence-api:jar:2.2:compile
[INFO] | | +- org.javassist:javassist:jar:3.24.0-GA:compile
[INFO] | | +- net.bytebuddy:byte-buddy:jar:1.10.7:compile
[INFO] | | +- antlr:antlr:jar:2.7.7:compile
[INFO] | | \- org.jboss:jandex:jar:2.1.1.Final:compile
此时,在POM文件的<dependencies>
中添加如下依赖即可解决问题:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
2.检查配置文件
同样是常见的问题,配置文件中存在语法错误、配置不正确或者配置缺失了某些必要的属性。可以参考以下检查步骤:
1.检查配置文件的语法是否正确:可以通过在线工具或者IDE自带的检查器进行检查。
2.检查配置文件中是否存在缺失的属性或者属性值:可以根据报错信息进行检查。
例如,假设项目启动报错如下:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.MappingException: Could not get constructor for org.hibernate.persister.entity.SingleTableEntityPersister
这种情况通常是因为配置信息缺失导致的问题,可以针对性地检查配置文件。例如,检查数据源相关配置:
spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=true
username: root
password: 123456
如果出现了缺失属性的问题,则需要添加相应的配置信息。例如,在上述配置文件中缺失了数据源的密码,可以将password
属性的值补充完成即可:
spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=true
username: root
password: 123456
示例说明
首先,在检查POM文件依赖方面,我们可以使用一个实际发生的问题为例说明这种解决方式。假设在SpringBoot 2.2.0版本中,使用MySQL作为数据源,项目启动时出现以下报错信息:
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'dataSourceInitializerPostProcessor': Unsatisfied dependency expressed through field 'dataSource'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'javax.sql.DataSource' available
这种情况通常是因为数据源相关依赖缺失导致的问题。我们可以使用mvn dependency:tree
命令查看项目的依赖树。如下:
[INFO] | +- org.springframework.boot:spring-boot-starter-data-jpa:jar:2.2.0.RELEASE:compile
[INFO] | | +- org.springframework.boot:spring-boot-starter-aop:jar:2.2.0.RELEASE:compile
[INFO] | | | \- org.aspectj:aspectjweaver:jar:1.9.4:compile
[INFO] | | +- jakarta.transaction:jakarta.transaction-api:jar:1.3.3:compile
[INFO] | | +- jakarta.persistence:jakarta.persistence-api:jar:2.2.3:compile
[INFO] | | +- org.hibernate:hibernate-core:jar:5.4.8.Final:compile
[INFO] | | | +- org.jboss.logging:jboss-logging:jar:3.4.1.Final:compile
[INFO] | | | +- javax.persistence:javax.persistence-api:jar:2.2:compile
[INFO] | | | +- org.javassist:javassist:jar:3.24.0-GA:compile
[INFO] | | | +- net.bytebuddy:byte-buddy:jar:1.10.6:compile
[INFO] | | | +- antlr:antlr:jar:2.7.7:compile
[INFO] | | | \- org.jboss:jandex:jar:2.1.1.Final:compile
[INFO] | | \- org.springframework.data:spring-data-jpa:jar:2.2.0.RELEASE:compile
[INFO] | | +- org.springframework.data:spring-data-commons:jar:2.2.0.RELEASE:compile
[INFO] | | +- org.springframework:spring-orm:jar:5.2.0.RELEASE:compile
[INFO] | | \- org.springframework:spring-tx:jar:5.2.0.RELEASE:compile
[INFO] | \- org.springframework.boot:spring-boot-starter-jdbc:jar:2.2.0.RELEASE:compile
[INFO] | +- com.zaxxer:HikariCP:jar:3.4.1:compile
[INFO] | \- jakarta.activation:jakarta.activation-api:jar:1.2.1:compile
可以看到,项目中缺失了MySQL的依赖,可以手动添加如下依赖信息:
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
其次,我们来以检查配置文件方面为例说明。如果使用了SpringBoot进行开发,通常会使用application.yml作为配置文件,例如下述示例:
server:
port: 8090
spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/test?characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai&autoReconnect=true&failOverReadOnly=false
username: root
jackson:
date-format: yyyy-MM-dd HH:mm:ss
time-zone: GMT+8
假设在这个文件中存在语法错误,或者缺失了某些属性的配置信息,也会导致项目启动失败,出现类似如下的报错信息:
org.yaml.snakeyaml.parser.ParserException: while parsing a block mapping in 'reader', line 2, column 1: server: ^ expected
, but found '?' in 'reader', line 8, column 18: url: jdbc:mysql://localhost:33 ... ^
此时,可以根据报错信息逐行检查配置文件,定位错误并做出修改,从而解决问题。
以上就是SpringBoot项目启动报错"Error starting ApplicationContext...."的完整攻略,希望对您有所帮助。
本站文章如无特殊说明,均为本站原创,如若转载,请注明出处:SpringBoot项目报错:”Error starting ApplicationContext….”解决办法 - Python技术站