我如何解決這個問題 Spring Boot 應用程序？
[英]How do I fix this issue spring boot application?
問題描述
我正在開發一個彈簧啟動應用程序並面向下方
異常嘗試了很多方法仍然無法解決它幫助我解決這個問題。
下面是顯示與數據源的自動連線未實例化的錯誤。
> Please find the below structure of my project
Structure
Redglass-core
|———> src/main/java
———>com.javalabs.redglass
` ———>RedglassCoreAPPlication.java
|———> src/main/resources
———>application.properties
|———> src/test/java
———>com.javalabs.redglass.test
` ———>RedglassCoreAPPlicationTest.java
|————>/src
|————>/target
|————>pom.xml
下面是 application.properties 文件
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/company?useSSL=false&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=root
spring.jpa.hibernate.ddl-auto=update
這是我的 Springboot 入門類 RedglassCoreAPPlication.java
package com.javalabs.redglass;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.PropertySource;
RedglassCoreApplication.java
@SpringBootApplication
public class RedglassCoreApplication {
public static void main(String[] args) {
SpringApplication.run(RedglassCoreApplication.class, args);
}
}
> This is my Springboot Junit test class
RedglassCoreApplicationTest.java**
package com.javalabs.redglass.test;
import static org.junit.Assert.assertEquals;
import java.sql.SQLException;
import javax.sql.DataSource;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import
org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.test.context.ContextConfiguration;
import
org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.javalabs.redglass.RedglassCoreApplication;
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootApplication(scanBasePackageClasses =
RedglassCoreApplication.class)
@ContextConfiguration({"classpath*:/redglass-
core/applicationContext.xml"})
public class RedglassCoreApplicationTest {
@Autowired
DataSource datasource;
@Test
public void testDummy() throws SQLException
{
String schema = datasource.getConnection().getCatalog();
System.out.println("Schema name :- "+schema);
assertEquals("company", schema);
}
}
這是我的 maven pom.xml 文件 Pom.xml
<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 c.
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.javalabs</groupId>
<artifactId>redglass</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<artifactId>redglass-core</artifactId>
<dependencies>
<!-- JPA Data (We are going to use Repositories, Entities,
Hibernate, etc...) -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- Use MySQL Connector-J -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>javax.el</groupId>
<artifactId>javax.el-api</artifactId>
<version>2.2.4</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
</project>
> Seen below is the error which I am not able to fix it :-
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.javalabs.redglass.test.RedglassCoreApplicationTest': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: javax.sql.DataSource com.javalabs.redglass.test.RedglassCoreApplicationTest.datasource; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [javax.sql.DataSource] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireBeanProperties(AbstractAutowireCapableBeanFactory.java:385) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:118) ~[spring-test-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83) ~[spring-test-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:228) ~[spring-test-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:230) [spring-test-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289) [spring-test-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) [junit.jar:4.12]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291) [spring-test-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:249) [spring-test-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:89) [spring-test-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) [junit.jar:4.12]
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) [junit.jar:4.12]
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) [junit.jar:4.12]
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) [junit.jar:4.12]
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) [junit.jar:4.12]
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) [spring-test-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) [spring-test-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.junit.runners.ParentRunner.run(ParentRunner.java:363) [junit.jar:4.12]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:193) [spring-test-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) [.cp/:na]
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) [.cp/:na]
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538) [.cp/:na]
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760) [.cp/:na]
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460) [.cp/:na]
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206) [.cp/:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: javax.sql.DataSource com.javalabs.redglass.test.RedglassCoreApplicationTest.datasource; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [javax.sql.DataSource] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:573) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
... 26 common frames omitted
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [javax.sql.DataSource] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1373) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1119) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
... 28 common frames omitted
11:16:38.402 [main] DEBUG o.s.t.c.s.AbstractDirtiesContextTestExecutionListener - After test class: context [DefaultTestContext@6bedbc4d testClass = RedglassCoreApplicationTest, testInstance = [null], testMethod = [null], testException = [null], mergedContextConfiguration = [MergedContextConfiguration@932bc4a testClass = RedglassCoreApplicationTest, locations = '{classpath*:/redglass-core/applicationContext.xml}', classes = '{}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{}', contextLoader = 'org.springframework.test.context.support.DelegatingSmartContextLoader', parent = [null]]], class annotated with @DirtiesContext [false] with mode [null].
11:16:38.404 [Thread-0] INFO o.s.c.s.GenericApplicationContext - Closing org.springframework.context.support.GenericApplicationContext@35aea049: startup date [Fri Jan 11 11:16:38 EST 2019]; root of context hierarchy
11:16:38.405 [Thread-0] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'lifecycleProcessor'
11:16:38.405 [Thread-0] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@38145825: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalPersistenceAnnotationProcessor,org.springframework.context.event.internalEventListenerProcessor,org.springframework.context.event.internalEventListenerFactory,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor,org.springframework.context.annotation.ConfigurationClassPostProcessor.enhancedConfigurationProcessor]; root of factory hierarchy
1 個解決方案
解決方案1
0 2019-01-12 02:01:37
DataSource 類不是 Autowired，它的實例不能被 Spring 控制。 您可能需要將 @Component 注釋放在 DataSource 類的聲明上方，或者創建一個返回該類實例的 @Bean。
但首先檢查 src/main/resources/application.properties 中存在的數據庫連接設置。
@Component public class DataSource { (...) }
@SpringBootApplication public class RedglassCoreApplication { public static void main(String[] args) { SpringApplication.run(RedglassCoreApplication.class, args); } @Bean public DataSource dataSource() { return //DataSource Instance } }
如果這兩個選項都不起作用，請檢查 src/main/resources/application.properties 中存在的數據庫連接設置
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