在 Spring Boot 中使用 PostgreSQL 驱动程序创建数据源时出现异常 [英] Exception when creating datasource with PostgreSQL driver in Spring Boot
问题描述
我正在尝试按照 MKyong 的例子，但我得到以下错误:
I'm trying to create a non-web application using Spring Boot following a MKyong's example, but I got the following error:
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.0.5.RELEASE)
(...) Several not relevant INFO log lines
2018-12-12 11:45:29.420 ERROR 30866 --- [ main] com.zaxxer.hikari.HikariConfig : Failed to load driver class org.postgresql.Driver from HikariConfig class classloader sun.misc.Launcher$AppClassLoader@18b4aac2
2018-12-12 11:45:29.423 WARN 30866 --- [ main] s.c.a.AnnotationConfigApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.boot.context.properties.ConfigurationPropertiesBindException: Error creating bean with name 'ldConfiguration': Could not bind properties to 'LdConfiguration' : prefix=datasources.ld, ignoreInvalidFields=false, ignoreUnknownFields=true; nested exception is org.springframework.boot.context.properties.bind.BindException: Failed to bind properties under 'datasources.ld' to es.ortoplus.LdConfiguration$$EnhancerBySpringCGLIB$$625f0f64
2018-12-12 11:45:29.435 INFO 30866 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-12-12 11:45:29.440 ERROR 30866 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Failed to bind properties under 'datasources.ld' to es.oplus.LdConfiguration$$EnhancerBySpringCGLIB$$625f0f64:
Property: datasources.ld.driverclassname
Value: org.postgresql.Driver
Origin: class path resource [application.yml]:3:22
Reason: Failed to load driver class org.postgresql.Driver in either of HikariConfig class loader or Thread context classloader
Action:
Update your application's configuration
我的 conf 文件 (application.yml) 是
My conf file (application.yml) is
datasources:
ld:
driverClassName: org.postgresql.Driver
jdbc-url: jdbc:postgresql://localhost:5432/oplus
username: user123
password: 123456
connection-test-query: SELECT 1
并在我的 Maven pom.xml 文件中添加:
And in my Maven pom.xml file I added:
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<!--<version> (managed by Spring Boot)42.2.5 </version> -->
</dependency>
我的入口点类:
@SpringBootApplication
public class App implements CommandLineRunner {
@Autowired private UsuarioRepository usuarioRep;
@Override
public void run(String... args) throws Exception {
App app = new App();
System.out.printf("Users: %1d", app.usuarioRep.count());
}
public static void main(String[] args) throws ClassNotFoundException {
//Class.forName("org.postgresql.Driver");
SpringApplication.run(App.class, args);
}
}
如您所见，我已尝试检查该类是否已在类路径中.如果我取消注释该行，我会收到 ClassNotFoundException，因此错误似乎是由于 Maven 不包含依赖项而引起的.我试图将范围设置为 runtime，但它还是失败了.
As you can see, I've tried to check if the class is already in the classpath. If I uncomment that line I got a ClassNotFoundException, so it seems the error is caused because Maven is not including the dependency. I've tried to set the scope as runtime, but it fails anyway.
无论如何，这是我的配置类:
Anyway, here is my Configuration class:
@Configuration
@ConfigurationProperties(prefix = "datasources.ld")
@EnableTransactionManagement
@EnableJpaRepositories(entityManagerFactoryRef = "postgreEntityManagerFactory", transactionManagerRef = "postgreTransactionManager",
basePackages = "es.plus.l.dao")
public class LdConfiguration extends HikariConfig {
@Bean(name = "postgreDataSource")
@Primary
public DataSource dataSource() {
return new HikariDataSource(this);
}
@Bean(name = "postgreEntityManagerFactory")
@Primary
public LocalContainerEntityManagerFactoryBean postgreEntityManagerFactory(
final EntityManagerFactoryBuilder builder,
@Qualifier("postgreDataSource") final DataSource dataSource) {
final LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
entityManagerFactoryBean.setJpaVendorAdapter(this.vendorAdaptor());
entityManagerFactoryBean.setDataSource(dataSource);
entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);
entityManagerFactoryBean.setPersistenceUnitName("postgre");
entityManagerFactoryBean.setPackagesToScan("es.oplus.ld.model");
entityManagerFactoryBean.setJpaProperties(this.jpaHibernateProperties());
entityManagerFactoryBean.afterPropertiesSet();
return entityManagerFactoryBean;
}
@Bean(name = "postgreTransactionManager")
@Primary
public PlatformTransactionManager postgreTransactionManager(
@Qualifier("postgreEntityManagerFactory") final EntityManagerFactory emf) {
return new JpaTransactionManager(emf);
}
private HibernateJpaVendorAdapter vendorAdaptor() {
final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
// put all the adapter properties here, such as show sql
return vendorAdapter;
}
private Properties jpaHibernateProperties() {
final Properties properties = new Properties();
// put all required jpa propeties here
return properties;
}
}
推荐答案
我发现了问题:Eclipse 正确显示了依赖项，但由于该类似乎并不真正存在，我尝试手动运行它，因此当我执行:
I found the problem: Eclipse showed the dependencies properly, but as it seemed the class was not really present, I tried to run it manually, so when I executed:
mvn clean install
我从 Maven 得到这个错误
I got this error from Maven
error reading /home/pablo/.m2/repository/org/postgresql/postgresql/42.2.5/postgresql-42.2.5.jar; invalid LOC header (bad signature)
所以这个错误是由Maven下载了损坏的jar版本引起的.
So the error was caused by Maven downloading a corrupt version of the jar.
删除它以强制重新下载解决了该问题.
Deleting it to force a new download fixed the issue.
这篇关于在 Spring Boot 中使用 PostgreSQL 驱动程序创建数据源时出现异常的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
