我嘗試使用數據庫連接構建 RestFull Web 服務。但這似乎沒有與數據庫連接。我在控制臺中收到此錯誤。 com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) ~[mysql-connector-java-8.0.18.jar:8.0.18] at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) ~[mysql-connector-java-8.0.18.jar:8.0.18] at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836) ~[mysql-connector-java-8.0.18.jar:8.0.18]The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_162] at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[na:1.8.0_162] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[na:1.8.0_162]Caused by: java.net.UnknownHostException: db_example at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) ~[na:1.8.0_162] at java.net.InetAddress$2.lookupAllHostAddr(Unknown Source) ~[na:1.8.0_162]Caused by: org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment] at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:275) ~[hibernate-core-5.4.6.Final.jar:5.4.6.Final] at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:237) ~[hibernate-core-5.4.6.Final.jar:5.4.6.Final]這是我的 application.property 文件我不明白這有什么問題。
2 回答
肥皂起泡泡
TA貢獻1829條經驗 獲得超6個贊
我認為這里的主機名有問題。因此，請檢查一次主機名，例如 localhost（或）您正確的數據庫托管地名。
因為它顯示像unknownHostException這樣的異常。
瀟湘沐
TA貢獻1816條經驗 獲得超6個贊
spring.datasource.url=jdbc:mysql://localhost:3306/db_example
spring.datasource.username = root
spring.datasource.password = root
spring.jpa.properties.hibernate.dialect =org.hibernate.dialect.MySQL5Dialect
hibernate.dialect=org.hibernate.dialectMySQL5Dialect
hibernate.show_sql=true
hibernate.hbm2ddl.auto=create
hibernate.ddl-auto=validate
hibernate.connection.url=jdbc:mysql://localhost:3306/axa_india?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull
hibernate.connection.username=root
hibernate.connection.password=root
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