Maven 在 spring 項目構建中失敗，試圖與數據庫建立連接

Question

我為我的 spring 項目制作了一個 docker-compose 和 dockerfile，但它在 maven 構建階段失敗，因為它正在嘗試與 postgres 服務建立連接，我不知道如何解決它。

這是我的 docker-compose 文件：

version: '3'
services:

  postgres:
    build:
      context: .
      dockerfile: docker/postgres/Dockerfile
    restart: always
    environment:
      POSTGRES_DB: ${postgres_database}
      POSTGRES_USER: ${postgres_username}
      POSTGRES_PASSWORD: ${postgres_password}
    ports:
      - '5432:5432'
    volumes:
      - ./pgdata:/var/lib/postgresql/data

  api:
    build:
      context: .
      dockerfile: docker/jdk/Dockerfile
    restart: always
    environment:
      postgres_database: ${postgres_database}
      postgres_username: ${postgres_username}
      postgres_password: ${postgres_password}
    ports:
      - '8100:8080'
    depends_on:
      - postgres

我的 postgres dockerfile：

FROM postgres:11-alpine

ENV POSTGRES_DB: ${POSTGRES_DB}
ENV POSTGRES_USER: ${POSTGRES_USER}
ENV POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}

COPY ./docker/postgres/init.sql /docker-entrypoint-initdb.d

EXPOSE 5432

我的 jdk dockerfile，我在其中構建了項目（它失敗了）並運行了 jar：

FROM maven:3.6.0-jdk-11-slim AS build

COPY ./src /usr/src/app/src
COPY ./pom.xml /usr/src/app

RUN mvn -f /usr/src/app/pom.xml clean package

FROM adoptopenjdk/openjdk11:jre11u-alpine-nightly

COPY --from=build /src/usr/src/app/target/logger_service-0.0.1-SNAPSHOT.jar /usr/src/app/app.jar

EXPOSE 8080

ENTRYPOINT ["java", "-jar", "/usr/app/app.jar"]

錯誤日志：

[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 14.844 s <<< FAILURE! - in cl.getcolors.loggerservice.LoggerServiceApplicationTests
[ERROR] contextLoads(cl.getcolors.loggerservice.LoggerServiceApplicationTests)  Time elapsed: 0.014 s  <<< ERROR!
java.lang.IllegalStateException: Failed to load ApplicationContext
Caused by: 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.exception.JDBCConnectionException: Unable to open JDBC Connection for DDL execution
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to open JDBC Connection for DDL execution
Caused by: org.hibernate.exception.JDBCConnectionException: Unable to open JDBC Connection for DDL execution
Caused by: org.postgresql.util.PSQLException: The connection attempt failed.
Caused by: java.net.UnknownHostException: postgres

我該如何解決？

Answer 1

我找到了解決方案，maven嘗試執行應用程序的測試，以便它根據配置執行對數據庫的調用，這是通過mvn clean package命令執行的。 -DskipTests必須將指令添加到命令以運行maven no tests，因此可以正確構建。

mvn clean package -DskipTests

我的dockerfile現在看起來像這樣，可以正常工作：

FROM maven:3.6.0-jdk-11-slim AS build

COPY ./src /usr/src/app/src
COPY ./pom.xml /usr/src/app

RUN mvn -f /usr/src/app/pom.xml clean package -DskipTests

FROM adoptopenjdk/openjdk11:jre11u-alpine-nightly

COPY --from=build /src/usr/src/app/target/logger_service-0.0.1-SNAPSHOT.jar /usr/src/app/app.jar

EXPOSE 8080

ENTRYPOINT ["java", "-jar", "/usr/app/app.jar"]

Answer 2

進一步補充上述說明，必須注意的是，在構建映像時無法訪問數據庫。 只有在創建容器后，程序才能訪問數據庫。