Java 在Heroku上设置PostgreSQL数据库(必需的entityManagerFactory)
我想在Spring Boot中实现的Heroku上创建一个web应用程序。最后,我成功地部署了一个带有“Whitelabel error page 404”的普通项目,确认了部署的正确性 我接着说(几乎一样): 不幸的是,在添加服务(例如Spring Security和Lombok正常工作)后,我发现Spring数据JPA只有一个问题(我希望如此),这使得我无法构建应用程序并使用PostgreSQL:Java 在Heroku上设置PostgreSQL数据库(必需的entityManagerFactory),java,postgresql,jpa,heroku,spring-data-jpa,Java,Postgresql,Jpa,Heroku,Spring Data Jpa,我想在Spring Boot中实现的Heroku上创建一个web应用程序。最后,我成功地部署了一个带有“Whitelabel error page 404”的普通项目,确认了部署的正确性 我接着说(几乎一样): 不幸的是,在添加服务(例如Spring Security和Lombok正常工作)后,我发现Spring数据JPA只有一个问题(我希望如此),这使得我无法构建应用程序并使用PostgreSQL: Description: Parameter 0 of constructor in io.g
Description:
Parameter 0 of constructor in io.github.plkpiotr.fifabackend.controller.TaskController required a bean named 'entityManagerFactory' that could not be found.
Action:
Consider defining a bean named 'entityManagerFactory' in your configuration.
pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>io.github.plkpiotr</groupId>
<artifactId>fifa-backend</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>fifa-backend</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!--<dependency>-->
<!--<groupId>org.springframework.boot</groupId>-->
<!--<artifactId>spring-boot-starter-security</artifactId>-->
<!--</dependency>-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.22</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Task.java:
package io.github.plkpiotr.fifabackend.model;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.validation.constraints.NotNull;
@Entity
public class Task {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Long id;
@NotNull
private String name;
public Task() {}
public Task(String name) {
this.name = name;
}
public Long getId() {
return this.id;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return String.format("Task[id=%d, name='%s']", this.id, this.name);
}
}
TaskRepository.java:
package io.github.plkpiotr.fifabackend.repository;
import io.github.plkpiotr.fifabackend.model.Task;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
@Repository
public interface TaskRepository extends CrudRepository<Task, Long> {}
如何解决问题?
@EntityScan
,@EnableJpaRepositories
和@ComponentScan
不支持通配符语法。例如,您当前使用:
@EntityScan("io.github.plkpiotr.*")`
但它应该只是基本包名
@EntityScan("io.github.plkpiotr")
此设置看起来可疑:spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration您是否尝试删除该行?基本上,您是在告诉spring不要自动配置您的数据源,这样如果我没有弄错的话,您就不会有EntityManagerFactory了。如果我看一看Sprin我已经成功部署到Heroku的g-Boot应用程序,除了您的属性之外,我还看到了以下行:spring.datasource.url=jdbc:postgresql://localhost:5432/your_database 请注意,Heroku将此url替换为它自己的url,但可能需要显示该属性?此外,您还可以删除所有您拥有的内容在您的FifaBackendApplication类上,您只需要在这样一个简单的应用程序上安装@SpringBootApplication。Spring会发现您自己有实体,因为您已经定义了Spring启动程序数据jpa依赖项。请尝试添加以下属性:Spring.datasource.username=您的用户Spring.datasource.password=一些\u密码这些属性也是被Heroku替换,这样它们可能是随机的。您是否删除了FifaBackendApplication类上的所有注释?您是否可以将当前拥有的内容推送到git repo,我来看看它的原因:
org.springframework.beans.factory.BeanCreationException:创建名为“entityManagerFactory”的bean时出错类内路径资源[org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]:调用init方法失败;嵌套异常为java.lang.NoClassDefFoundError:javassist/bytecode/ClassFile
但是,添加注释是因为寻找解决方案,老实说,这不是故意的。添加预期版本并查看它是否有帮助。如果有,请调试它丢失的原因,您的pom.xml
看起来正常。
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jpaMappingContext': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: At least one JPA metamodel must be present!
@EntityScan("io.github.plkpiotr.*")`
@EntityScan("io.github.plkpiotr")