我从链接中遵循相同的代码：http://websystique.com/spring-boot/spring-boot-angularjs-spring-data-jpa-crud-app-example/。但是当我简单地运行Spring Boot的主要方法时，我发现下面的错误即将到来。你能指导一下吗？我正在使用Java 7。
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [com/websystique/springboot/configuration/JpaConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean]: Factory method 'entityManagerFactory' threw exception; nested exception is java.lang.IllegalStateException: required key [datasource.sampleapp.hibernate.dialect] not found
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1134) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1028) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1081) ~[spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:856) ~[spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) ~[spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
at com.websystique.springboot.SpringBootCRUDApp.main(SpringBootCRUDApp.java:15) ~[classes/:na]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean]: Factory method 'entityManagerFactory' threw exception; nested exception is java.lang.IllegalStateException: required key [datasource.sampleapp.hibernate.dialect] not found
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
... 18 common frames omitted
Caused by: java.lang.IllegalStateException: required key [datasource.sampleapp.hibernate.dialect] not found
at org.springframework.core.env.AbstractPropertyResolver.getRequiredProperty(AbstractPropertyResolver.java:183) ~[spring-core-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.core.env.AbstractEnvironment.getRequiredProperty(AbstractEnvironment.java:556) ~[spring-core-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at com.websystique.springboot.configuration.JpaConfiguration.jpaProperties(JpaConfiguration.java:98) ~[classes/:na]
at com.websystique.springboot.configuration.JpaConfiguration.entityManagerFactory(JpaConfiguration.java:80) ~[classes/:na]
at com.websystique.springboot.configuration.JpaConfiguration$$EnhancerBySpringCGLIB$$3ce60e74.CGLIB$entityManagerFactory$2(<generated>) ~[classes/:na]
at com.websystique.springboot.configuration.JpaConfiguration$$EnhancerBySpringCGLIB$$3ce60e74$$FastClassBySpringCGLIB$$a174a592.invoke(<generated>) ~[classes/:na]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:356) ~[spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at com.websystique.springboot.configuration.JpaConfiguration$$EnhancerBySpringCGLIB$$3ce60e74.entityManagerFactory(<generated>) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_25]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_25]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_25]
at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_25]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
... 19 common frames omitted
application.yml
---
server:
port: 8080
contextPath: /SpringBootCRUDApp
---
spring:
profiles: local
datasource:
sampleapp:
url: jdbc:h2:~/test
username: SA
password:
driverClassName: org.h2.Driver
defaultSchema:
maxPoolSize: 10
hibernate:
hbm2ddl.method: create-drop
show_sql: true
format_sql: true
dialect: org.hibernate.dialect.H2Dialect
---
spring:
profiles: prod
datasource:
sampleapp:
url: jdbc:mysql://localhost:3306/test
username: root
password: root
driverClassName: com.mysql.jdbc.Driver
defaultSchema:
maxPoolSize: 20
hibernate:
hbm2ddl.method: update
show_sql: true
format_sql: true
dialect: org.hibernate.dialect.MySQLDialect
pom.hml
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.3.RELEASE</version>
</parent>
<properties>
<java.version>1.7</java.version>
<h2.version>1.4.187</h2.version>
</properties>
<dependencies>
<!-- Add typical dependencies for a web application -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- Add freemarker template support -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>
<!-- Add JPA support -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- Add Hikari Connection Pooling support -->
<dependency>
<groupId>com.zaxxer</groupId>
<artifactId>HikariCP</artifactId>
</dependency>
<!-- Add H2 database support [for running with local profile] -->
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>${h2.version}</version>
</dependency>
<!-- Add MySQL database support [for running with PRODUCTION profile] -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.5</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin><!-- Include if you want to make an executable jar[FAT JAR which
includes all dependencies along with sprinboot loader] that you can run on
commandline using java -jar NAME -->
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
spring boot crud app.Java
@Import(JpaConfiguration.class)
@SpringBootApplication(scanBasePackages={"com.websystique.springboot"})// same as @Configuration @EnableAutoConfiguration @ComponentScan
public class SpringBootCRUDApp {
public static void main(String[] args) {
SpringApplication.run(SpringBootCRUDApp.class, args);
}
}
JP A configuration.Java
@Configuration
@EnableJpaRepositories(basePackages = "com.websystique.springboot.repositories",
entityManagerFactoryRef = "entityManagerFactory",transactionManagerRef = "transactionManager")
@EnableTransactionManagement
public class JpaConfiguration {
@Autowired
private Environment environment;
@Value("${datasource.sampleapp.maxPoolSize:10}")
private int maxPoolSize;
/*
* Populate SpringBoot DataSourceProperties object directly from application.yml
* based on prefix.Thanks to .yml, Hierachical data is mapped out of the box with matching-name
* properties of DataSourceProperties object].
*/
@Bean
@Primary
@ConfigurationProperties(prefix = "datasource.sampleapp")
public DataSourceProperties dataSourceProperties(){
return new DataSourceProperties();
}
/*
* Configure HikariCP pooled DataSource.
*/
@Bean
public DataSource dataSource() {
DataSourceProperties dataSourceProperties = dataSourceProperties();
HikariDataSource dataSource = (HikariDataSource) DataSourceBuilder
.create(dataSourceProperties.getClassLoader())
.driverClassName(dataSourceProperties.getDriverClassName())
.url(dataSourceProperties.getUrl())
.username(dataSourceProperties.getUsername())
.password(dataSourceProperties.getPassword())
.type(HikariDataSource.class)
.build();
dataSource.setMaximumPoolSize(maxPoolSize);
return dataSource;
}
/*
* Entity Manager Factory setup.
*/
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() throws NamingException {
LocalContainerEntityManagerFactoryBean factoryBean = new LocalContainerEntityManagerFactoryBean();
factoryBean.setDataSource(dataSource());
factoryBean.setPackagesToScan(new String[] { "com.websystique.springboot.model" });
factoryBean.setJpaVendorAdapter(jpaVendorAdapter());
factoryBean.setJpaProperties(jpaProperties());
return factoryBean;
}
/*
* Provider specific adapter.
*/
@Bean
public JpaVendorAdapter jpaVendorAdapter() {
HibernateJpaVendorAdapter hibernateJpaVendorAdapter = new HibernateJpaVendorAdapter();
return hibernateJpaVendorAdapter;
}
/*
* Here you can specify any provider specific properties.
*/
private Properties jpaProperties() {
Properties properties = new Properties();
properties.put("hibernate.dialect", environment.getRequiredProperty("datasource.sampleapp.hibernate.dialect"));
properties.put("hibernate.hbm2ddl.auto", environment.getRequiredProperty("datasource.sampleapp.hibernate.hbm2ddl.method"));
properties.put("hibernate.show_sql", environment.getRequiredProperty("datasource.sampleapp.hibernate.show_sql"));
properties.put("hibernate.format_sql", environment.getRequiredProperty("datasource.sampleapp.hibernate.format_sql"));
if(StringUtils.isNotEmpty(environment.getRequiredProperty("datasource.sampleapp.defaultSchema"))){
properties.put("hibernate.default_schema", environment.getRequiredProperty("datasource.sampleapp.defaultSchema"));
}
return properties;
}
@Bean
@Autowired
public PlatformTransactionManager transactionManager(EntityManagerFactory emf) {
JpaTransactionManager txManager = new JpaTransactionManager();
txManager.setEntityManagerFactory(emf);
return txManager;
}
}
您可以为2个不同的环境创建活动配置文件，例如dev / prod来解决此问题。如果您正在使用Eclipse创建应用程序以在尝试启动应用程序时启动并添加VM参数，
for dev
-Dspring.profiles.active=local
for production
-Dspring.profiles.active=prod
如果你想以罐子的形式运行，
for Dev,
java -jar SpringBootCRUDApplicationExample-1.0.0.jar --spring.profiles.active=local
for Production,
java -jar SpringBootCRUDApplicationExample-1.0.0.jar --spring.profiles.active=prod
我没有足够的代表发表评论，但你有没有记得与个人资料一起运行？这个错误通常表明你不是。
该教程还说您已使用配置文件运行。
在运行我们的示例[通过IDE或命令行]时，我们可以使用-Dspring.profiles.active = local或-Dspring.profiles.active = prod在VM参数[用于IDE]或命令行java中提供配置文件信息-jar JARPATH --spring.profiles.active = local。
原因是Spring需要知道从属性文件中使用哪些属性（在本例中为yml文件）。
如果您正在使用Eclipse ...只需右键单击pom.xml - > Run As - > Run Configurations。然后它将打开新的弹出窗口，您可以在Java应用程序下看到SpringBootCRUDApp ...在右侧弹出窗口..选择Arguments选项卡...在那里您可以将第二个文本作为VM参数...只需要粘贴“-Dspring”。 profiles.active = local“..然后运行它..它会工作......
如果从cmd提示符为Dev运行，则java -jar SpringBootCRUDApplicationExample-1.0.0.jar --spring.profiles.active = local
for production，java -jar SpringBootCRUDApplicationExample-1.0.0.jar --spring.profiles.active = prod
--Njoy
为默认和本地创建单独的配置文件。这个对我有用。
spring:
profiles: default
datasource:
sampleapp:
url: jdbc:h2:~/test
username: SA
password:
driverClassName: org.h2.Driver
defaultSchema:
maxPoolSize: 10
hibernate:
hbm2ddl.method: create-drop
show_sql: true
format_sql: true
dialect: org.hibernate.dialect.H2Dialect
spring:
profiles: local
datasource:
sampleapp:
url: jdbc:h2:~/test
username: SA
password: