驅動程序：org.postgresql.Driver@3ed03652 為 URL 返回空值...在部署 Spring Boot 到 Heroku 時

Question

我嘗試在 Heroku 上部署我的應用程序，但有一些我無法修復我的 application.poperties 的錯誤

    spring.mvc.view.prefix = /WEB-INF/view/
spring.mvc.view.suffix = .jsp

spring.datasource.url = jdbc:postgres://user:pass@ec2-54-247-166-129.eu-west-1.compute.amazonaws.com:5432/database

# Username and password
spring.datasource.username = user
spring.datasource.password = pass

# Keep the connection alive if idle for a long time (needed in production)
spring.datasource.testWhileIdle = true
spring.datasource.validationQuery = SELECT 1

spring.datasource.driverClassName=org.postgresql.Driver

# ===============================
# = JPA / HIBERNATE
# ===============================

# Use spring.jpa.properties.* for Hibernate native properties (the prefix is
# stripped before adding them to the entity manager).

# Show or not log for each sql query
spring.jpa.show-sql = true

# Hibernate ddl auto (create, create-drop, update): with "update" the database
# schema will be automatically updated accordingly to java entities found in
# the project
spring.jpa.hibernate.ddl-auto = update

# Naming strategy
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy

# Allows Hibernate to generate SQL optimized for a particular DBMS
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQLDialect

我的 Application 類是用於應用程序啟動的標准 Spring Boot 類

我的 pom.xml（它的一部分）：

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-cache</artifactId>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
        </dependency>

    </dependencies>
    <build>
        <finalName>spring</finalName>
        <plugins>
            <!-- Spring Boot Maven -->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>copy</goal>
                        </goals>
                        <configuration>
                            <artifactItems>
                                <artifactItem>
                                    <groupId>com.github.jsimone</groupId>
                                    <artifactId>webapp-runner</artifactId>
                                    <version>8.0.30.2</version>
                                    <destFileName>webapp-runner.jar</destFileName>
                                </artifactItem>
                            </artifactItems>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

我收到的錯誤

> 12:06:42.061  INFO 12352 --- [ost-startStop-1]
> o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter:
> 'applicationContextIdFilter' to: [/*] 2017-03-10 12:06:42.488 ERROR
> 12352 --- [           main] o.a.tomcat.jdbc.pool.ConnectionPool      :
> Unable to create initial connections of pool.
> 
> java.sql.SQLException: Driver:org.postgresql.Driver@760cf594 returned
> null for
> URL:jdbc:postgres://fqwebtafwgsgmp:17ff02102b2660162ce1b053ef28340dfa7cf4d71e14b4bf1b187a8ad7d36579@ec2-54-247-166-129.eu-west-1.compute.amazonaws.com:5432/daapseha11ekml
>   at
> org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:329)
> ~[tomcat-jdbc-8.5.11.jar:na]  at
> org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:203)
> ~[tomcat-jdbc-8.5.11.jar:na]  at
> org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:732)
> [tomcat-jdbc-8.5.11.jar:na]   at
> org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:664)
> [tomcat-jdbc-8.5.11.jar:na]   at
> org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:479)
> [tomcat-jdbc-8.5.11.jar:na]   at
> org.apache.tomcat.jdbc.pool.ConnectionPool.<init>(ConnectionPool.java:154)
> [tomcat-jdbc-8.5.11.jar:na]   at
> org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:118)
> [tomcat-jdbc-8.5.11.jar:na]   at

如果有人解釋我的錯誤，我將不勝感激

Answer 1

您在 JDBC URL 中使用jdbc:postgres而不是jdbc:postgresql （注意額外的ql ）。

Heroku上已經設置SPRING_DATASOURCE_URL環境變量為你，所以你應該能夠刪除您spring.datasource中的條目application.properties完全。

如果您無法刪除它們，請嘗試：

spring.datasource.url=${JDBC_DATABASE_URL}

如果這不起作用，那一定意味着您沒有使用 Java buildpack 或其他東西。

還要確保運行：

heroku pg:credentials --reset

Answer 2

您的問題可能是您的連接網址。 您在 url 中有有效的用戶名和密碼。

將您的spring.datasource設置更改為：

spring.datasource.url = jdbc:postgres://ec2-54-247-166-129.eu-west-1.compute.amazonaws.com:5432/database

# Username and password
spring.datasource.username = user
spring.datasource.password = pass

附注。 我嘗試並連接到您的數據庫實例，因此我會盡快更改它們。

Answer 3

使用 Spring Boot：2.3.4 和驅動程序版本：42.2.18

特性

spring:
    datasource:
        password: ${RDBMS_PASSWORD:pass}
        driver-class-name: org.postgresql.Driver
        url: jdbc:postgresql://${DATABASE_HOST:ec2-54-217-213-79.eu-west-1.compute.amazonaws.com}:${DATABASE_PORT:5432}/${DATABASE_NAME:dbName}?sslmode=require
        username: ${DATABASE_USER:user}
        initialization-mode: always
        initialize: true
        schema: classpath:/schema.sql
        data: classpath:/data.sql
    jpa:
        hibernate:
            ddl-auto: none
        show-sql: true
        generate-ddl: false
        properties:
            hibernate:
                dialect: org.hibernate.dialect.MySQL5InnoDBDialect

注意網址：jdbc:postgresql://