使用 JNDI 数据源的 Spring Boot

我有一个新的 Spring Boot Web 应用程序，我想连接到 JNDI 数据源（Tomcat 的 context.xml 中定义的 MySQL 数据库）。

然而，当我尝试这样做时，我总是遇到以下异常；

org.springframework.beans.factory.BeanCreationException: Cannot determine embedded database url for database type NONE. If you want an embedded database please put a supported on on the classpath.

尽管我的 pom.xml 包含 MySQL 连接器，但还是如此

<?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.test</groupId>
<artifactId>twojndi</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>

<name>Two JNDI Data Sources</name>
<description>Two JNDI Data Sources Example</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.1.8.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>

<dependencies>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.hibernate</groupId>
                <artifactId>hibernate-entitymanager</artifactId>
            </exclusion>
            <exclusion>
                <artifactId>tomcat-jdbc</artifactId>
                <groupId>org.apache.tomcat</groupId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
    </dependency>
</dependencies>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <start-class>org.test.twojndi.Application</start-class>
    <java.version>1.7</java.version>
</properties>

<build>
    <finalName>${artifactId}</finalName>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

</project>

我已按如下方式定义 application.properties 以使用 jndi-name 属性。

spring.datasource.jndi-name=java:comp/env/jdbc/twojndi_ds1
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect

然而尽管如此，Spring 似乎认为应该使用内存数据库。

如果我这样定义 application.properties 我就能够连接到 MySQL 数据库

spring.datasource.url=jdbc:mysql://localhost:3306/twojndi_ds1
spring.datasource.username=twojndi
spring.datasource.password=twojndi
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect

谁能帮我用 Spring Boot 连接到 JNDI？

正如 M. Deinum 所评论的，JDNI 查找是在 Spring Boot 1.2 中实现的，当前版本是 1.2.0.M2。

如果你想用 Spring Boot 1.1 来做到这一点，你可以像这样定义一个 bean：

@Bean
public DataSource dataSource() {
    JndiObjectFactoryBean jndiObjectFactoryBean = new JndiObjectFactoryBean();
    jndiObjectFactoryBean.setJndiName("jdbc/jndidatasource");
    try {
        jndiObjectFactoryBean.afterPropertiesSet();
    } catch (NamingException e) {
        LOGGER.error("Error while retrieving datasource with JNDI name jdbc/jndidatasource", e);
    }
    return (DataSource) jndiObjectFactoryBean.getObject();
}