Spring Boot项目未从应用程序绑定@Value。属性

Question

我正在将一个现有的多模块maven项目迁移到spring boot 2.6.1，我已经填充了这个应用程序。其中一个模块（具有SpringBootApplication入口点和SpringBootMaven插件的模块）的resources文件夹中的属性。我可以通过应用程序环境从项目中的任何模块访问这些属性。但是，使用@Value绑定属性不起作用

以下是我的项目结构

PROJ
└── pom.xml
└── ModuleA
    └── src
        └── main
            └── java
                └── com.example
                    └── abc
                        └── configuration
                            └── TestConfig.java
                        └── MyApplication.java
            └── resources
                └── application.properties
    └── pom.xml
└── ModuleB     

为什么@ConfigurationProperties或@Value的属性绑定失败？（我正在尝试使用@ConfigurationProperties将所有数据源属性绑定到ModuleB中的DataSourceProperties bean，如留档中所述-但这也不起作用。）

我尝试过的事情：

• 提交申请。配置目录中的属性

代码：

波姆。xml

<?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>com.example</groupId>
    <artifactId>PROJ</artifactId>
    <version>1.0</version>
    <packaging>pom</packaging>
    <name>PROJ</name>

    <modules>
        <module>ModuleA</module>
        <module>ModuleB</module>
        <!-- Other modules -->
    </modules>

    <profiles>
        <profile>
            <id>dev</id>
            <properties>
                <develop.mode>true</develop.mode>
            </properties>
        </profile>
        <profile>
            <id>prod</id>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
            <properties>
                <develop.mode>false</develop.mode>
            </properties>
        </profile>
    </profiles>

    <properties>
        <!-- Project Properties -->
    </properties>

    <dependencyManagement>
        <dependencies>
            <!-- In House Modules -->
            <dependency>
                <groupId>com.example</groupId>
                <artifactId>ModuleB</artifactId>
                <version>1.0</version>
            </dependency>
            <dependency>
                <groupId>com.example</groupId>
                <artifactId>ModuleA</artifactId>
                <version>1.0</version>
            </dependency>

            <!-- Spring -->
            <dependency>
                <!-- Import dependency management from Spring Boot -->
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-instrument</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aspects</artifactId>
                <version>${spring.version}</version>
            </dependency>

            <dependency>
                <groupId>org.springframework.plugin</groupId>
                <artifactId>spring-plugin-core</artifactId>
                <version>${spring-plugin.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.plugin</groupId>
                <artifactId>spring-plugin</artifactId>
                <version>${spring-plugin.version}</version>
                <type>pom</type>
            </dependency>

            <dependency>
                <groupId>org.springframework.security</groupId>
                <artifactId>spring-security-saml2-service-provider</artifactId>
                <version>5.5.0-BETA</version>
                <classifier>BETA</classifier>
            </dependency>
            <dependency>
                <groupId>org.springframework.security.oauth</groupId>
                <artifactId>spring-security-oauth</artifactId>
                <version>${spring-security-oauth.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.security.oauth</groupId>
                <artifactId>spring-security-oauth2</artifactId>
                <version>${spring-security-oauth.version}</version>
                <exclusions>
                    <exclusion>
                        <groupId>org.springframework</groupId>
                        <artifactId>spring-webmvc</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>

            <!-- Various other dependencies -->
            
        </dependencies>

    </dependencyManagement>

    <build>
        <pluginManagement>
            <plugins>
                <!-- Various plugins  -->
            </plugins>
        </pluginManagement>
    </build>

</project>

模块A/pom。xml

<?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>

    <parent>
        <artifactId>PROJ</artifactId>
        <groupId>com.example</groupId>
        <version>1.0</version>
    </parent>

    <artifactId>ModuleA</artifactId>
    <packaging>jar</packaging>
    <name>ModuleA</name>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>

        <!-- In House Modules -->
        <dependency>
            <groupId>com.example</groupId>
            <artifactId>ModuleB</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

应用属性

# My datasource properties
app.datasource.myds.username=TestName

我的申请。JAVA

@SpringBootApplication
public class WSMBootApp {
    public static void main(String[] args) {
        SpringApplication.run(WSMBootApp.class, args);
    }
}

TestConfig.java

@Configuration
public class TestConfig {

    @Value("${app.datasource.myds.username}")
    public String un;

    @Bean(name = "testbean1")
    @Primary
    public Boolean testbean1() {
        System.out.println("Value un: " + un); // prints null
        return Boolean.FALSE;
    }

    @Bean(name = "testbean2")
    public Boolean testbean2(Environment env) {
        System.out.println("Env property: " + env.getProperty("app.datasource.myds.username")); // prints TestName 
        return Boolean.TRUE;
    }
}

Answer 1

我已经找到了Spring Boot没有将我的属性与@Value或@ConfigurationProperties自动关联的原因。事实证明，我尝试迁移的项目实现了一个PropertyPlaceholderConfigurer bean，该bean未能正确初始化属性。我已经删除了这个bean，应用程序现在正在加载并自动连接应用程序中的所有属性。属性（来自所有模块）