Spring Boot Cloud Foundry错误中没有唯一的服务处理接口错误 [英] No unique service maching interface error in Spring Boot Cloud Foundry error
问题描述
我正在尝试遵循本教程 https://github.com/cf-platform-eng/spring-boot-cities/tree/master/cities-service 以在Cloud Foundry中运行我的spring boot应用程序。我在本地安装了bosh-lite
I am trying to follow this tutorial https://github.com/cf-platform-eng/spring-boot-cities/tree/master/cities-service to run my spring boot application in Cloud Foundry. I have local bosh-lite installation
我的Spring Boot应用程序以数据库身份连接到postgresql。我正在尝试连接到在本地（主机）上运行的Postgresql实例
My Spring Boot application connects to postgresql as database. I am trying to connect to the Postgresql instance running on my local (host machine )
如果部署到本地tomcat，我的应用程序在本地可以正常运行。
但是，当我将应用程序部署到bosh-lite时，它将失败，并显示以下错误无唯一服务处理接口错误。我的代码与本教程中提到的完全相同，只是我使用Maven来构建代码。
My application works fine locally if deployed to a local tomcat. But when i deploy the app to bosh-lite it fails with the following error "No unique service maching interface error ". My code is excatly the same as what is mentioned in the tutorial except i am using Maven to build my code.
2017-06-07T22:29:54.44+0530 [App/0] OUT Caused by: org.springframework.cloud.CloudException: No unique service matching interface javax.sql.DataSource found. Expected 1, found 0
2017-06-07T22:29:54.44+0530 [App/0] OUT at org.springframework.cloud.Cloud.getSingletonServiceConnector(Cloud.java:149) ~[spring-cloud-core-1.2.3.RELEASE.jar!/:na]
2017-06-07T22:29:54.44+0530 [App/0] OUT at org.saurav.cf.casestudy.employee.db.DataSourceConfiguration.dataSource(DataSourceConfiguration.java:20) ~[classes/:na]
2017-06-07T22:29:54.44+0530 [App/0] OUT at org.saurav.cf.casestudy.employee.db.DataSourceConfiguration$$EnhancerBySpringCGLIB$$847aab5e.CGLIB$dataSource$0(<generated>) ~[classes/:na]
2017-06-07T22:29:54.44+0530 [App/0] OUT at org.saurav.cf.casestudy.employee.db.DataSourceConfiguration$$EnhancerBySpringCGLIB$$847aab5e$$FastClassBySpringCGLIB$$2ad81e2b.invoke(<generated>) ~[classes/:na]
2017-06-07T22:29:54.44+0530 [App/0] OUT at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
2017-06-07T22:29:54.44+0530 [App/0] OUT at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:358) ~[spring-context-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
2017-06-07T22:29:54.44+0530 [App/0] OUT at org.saurav.cf.casestudy.employee.db.DataSourceConfiguration$$EnhancerBySpringCGLIB$$847aab5e.dataSource(<generated>) ~[classes/:na]
2017-06-07T22:29:54.44+0530 [App/0] OUT at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131]
我与postgres的连接正常。如果我不使用Spring Cloud Connector并从application.properties中正常读取值，则同一个应用程序可以正常工作。
My connection to postgres works fine. And the same app works fine if i don't use spring cloud connector and read the value normally from application.properties.
我的pom.xml`（具有spring依赖项引导云连接器和postgrsql驱动程序）
My pom.xml`(Has dependencies for spring boot cloud connector and postgrsql driver )
<?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>org.saurav.cf.casestudy</groupId>
<artifactId>employeerest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>employeerest</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.3.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>
<!-- <start-class>org.saurav.cf.casestudy.employee.EmployeerestApplication</start-class> -->
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-hateoas</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-cloud-connectors</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
`
[更新] 按照下面Scott的回答，
我查看了要使用云连接器的UPS的要求。由于我是用户提供的服务，因此我没有标签和标签。但是我添加了jdbc网址。
现在我的应用程序失败，并出现以下错误
[UPDATE] as per Scott's answers below i had a look at the requirements for a UPS to be picked up cloud connector.Since mine is an user provided provided service so i cannot have tags and label. But i added the jdbc urls. Now my app is failing with the below error
Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
时，为null为此，我设置了我的application.properties中的 spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQLDialect ，但仍然不起作用
For this i have set "spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect" in my application.properties but still it does not work
我还检查了我的数据库是否正在运行，并且服务实例中的数据库设置是否正确。
I have also checked that my DB is running and db settings in my service instance is correct.
下面是我的服务实例内容`
Below is my service instance content`
"VCAP_SERVICES": {
"user-provided": [
{
"credentials": {
"jdbcUrl": "jdbc:postgresql://10.0.2.2:5432/employee",
"username": "postgres",
"password": "admin",
"postgresUri": "postgresql://10.0.2.2:5432/employee",
"uri": "postgresql://10.0.2.2:5432/employee"
},
"label": "user-provided",
"name": "postgresql-cf-service",
"syslog_drain_url": "",
"tags": [],
"volume_mounts": []
}
]
}
`
最好的问候，
Saurav
` Best Regards, Saurav
推荐答案
如果包含 spring-boot-starter-cloud-connectors 作为依赖项，然后Spring Cloud Connectors将尝试创建连接数据库所需的 java.sql.DataSource bean。连接器通过查找具有找不到唯一的服务匹配接口javax.sql.DataSource 消息表示连接器找不到适当类型的服务绑定。
If you include spring-boot-starter-cloud-connectors as a dependency, then Spring Cloud Connectors will attempt to create the java.sql.DataSource bean necessary to connect to the database. Connectors does this by looking for a service binding that has certain characteristics. The No unique service matching interface javax.sql.DataSource found message means that Connectors couldn't find a service binding of the appropriate type.
如果要在该示例应用程序中使用连接器，则需要创建用户提供的服务实例，其中包含Postgres连接的详细信息，并将该服务实例绑定到应用程序。
If you want to use Connectors as in that sample app then you will need to create a user-provided service instance with the details of the Postgres connection and bind that service instance to the app.
或者，您可以删除 spring-boot-starter-cloud-connectors 依赖性，而使用 spring.datasource配置数据库连接。 属性。 application.yml 中的
Alternatively, you could remove the spring-boot-starter-cloud-connectors dependency and instead configure the database connection using spring.datasource properties in application.yml.
这些选项在博客文章。
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