将 Spring 引导连接到 PostgreSQL 失败

Question

I am trying to connect Spring Boot back-end to PostgreSQL but get this error:

org.postgresql.util.PSQLException: Der Verbindungsversuch schlug fehl. (->in english: Tried but  
failed to connect.)
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:257) ~[postgresql-9.4-1206-jdbc42.jar:9.4]
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:65) ~[postgresql-9.4-1206-jdbc42.jar:9.4]
at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:149) ~[postgresql-9.4-1206-jdbc42.jar:9.4]
at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:35) ~[postgresql-9.4-1206-jdbc42.jar:9.4]
at org.postgresql.jdbc3g.AbstractJdbc3gConnection.<init>(AbstractJdbc3gConnection.java:22) ~[postgresql-9.4-1206-jdbc42.jar:9.4]
at org.postgresql.jdbc4.AbstractJdbc4Connection.<init>(AbstractJdbc4Connection.java:47) ~[postgresql-9.4-1206-jdbc42.jar:9.4]
at org.postgresql.jdbc42.AbstractJdbc42Connection.<init>(AbstractJdbc42Connection.java:21) ~[postgresql-9.4-1206-jdbc42.jar:9.4]
at org.postgresql.jdbc42.Jdbc42Connection.<init>(Jdbc42Connection.java:28) ~[postgresql-9.4-1206-jdbc42.jar:9.4]
at org.postgresql.Driver.makeConnection(Driver.java:415) ~[postgresql-9.4-1206-jdbc42.jar:9.4]
at org.postgresql.Driver.connect(Driver.java:282) ~[postgresql-9.4-1206-jdbc42.jar:9.4]
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138) ~[HikariCP-3.4.2.jar:na]
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:354) ~[HikariCP-3.4.2.jar:na]
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:202) ~[HikariCP-3.4.2.jar:na]
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:473) ~[HikariCP-3.4.2.jar:na]
at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:554) ~[HikariCP-3.4.2.jar:na]
at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115) ~[HikariCP-3.4.2.jar:na]
at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) ~[HikariCP-3.4.2.jar:na]
...
   

This is my application.properties file:

spring.datasource.url= jdbc:postgresql://localhost:5432/springbootdb 

spring.datasource.username=root 
spring.datasource.password=root   

spring.jpa.hibernate.ddl-auto=create-drop

the pom.xml:

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
        <version>2.2.6.RELEASE</version>
</dependency>

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

<dependency>
        <groupId>org.postgresql</groupId>
        <artifactId>postgresql</artifactId>
</dependency>    

<dependency>
        <groupId>org.postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>9.4-1206-jdbc42</version>
</dependency>

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

And that's the database springbootdb with the owner root:

Why does the connection fail?

Answer 1

Now it works. I first had created another repository, then I wanted to change the way I store my data and created a new entity, service & repository and didn't delete the old one. There was something wrong with the old one (the entity that was transferred from the service to the repository didn't fit the naming policy anymore, I think? I don't know what it was, but I deleted it to clean up my code and then it worked.