maven项目引入spring boot依赖之后filter不生效的问题

旧城等待， 2022-06-03 04:27 183阅读 0赞

创建一个maven项目，项目结构如下：

![20171218170006533][]

其中，pom.xml的内容如下：

<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.pp.test</groupId>
    	<artifactId>properties-test</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>jar</packaging>
    
    	<name>properties-test</name>
    	<url>http://maven.apache.org</url>
    
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>1.5.9.RELEASE</version>
    	</parent>
    
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<maven.compiler.source>1.8</maven.compiler.source>
    		<maven.compiler.target>1.8</maven.compiler.target>
    		<java.version>1.8</java.version>
    	</properties>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    		</dependency>
    	</dependencies>
    
    	<build>
    		<filters>
    			<filter>src/main/profiles/profile-${profiles.active}.properties</filter>
    		</filters>
    		<resources>
    			<resource>
    				<filtering>true</filtering>
    				<directory>src/main/resources</directory>
    			</resource>
    		</resources>
    	</build>
    
    
    	<profiles>
    		<profile>
    			<id>dev</id>
    			<properties>
    				<profiles.active>dev</profiles.active>
    			</properties>
    			<activation>
    				<activeByDefault>true</activeByDefault>
    			</activation>
    		</profile>
    		<profile>
    			<id>test</id>
    			<properties>
    				<profiles.active>test</profiles.active>
    			</properties>
    		</profile>
    		<profile>
    			<id>prod</id>
    			<properties>
    				<profiles.active>prod</profiles.active>
    			</properties>
    		</profile>
    	</profiles>
    </project>

application.properties 文件内容：

jdbc.driverClassName=${jdbc.driverClassName}
    jdbc.url=${jdbc.url}
    jdbc.username=${jdbc.username}
    jdbc.password=${jdbc.password}

profile-dev.properties 文件内容：

jdbc.driverClassName=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql:///db_users
    jdbc.username=root
    jdbc.password=root

启动应用，报错了，错误如下：

Caused by: java.lang.IllegalArgumentException: Circular placeholder reference 'jdbc.url' in property definitions
    	at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:141) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:162) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:236) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.core.env.AbstractPropertyResolver.resolveNestedPlaceholders(AbstractPropertyResolver.java:227) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:84) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:61) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.core.env.AbstractEnvironment.getProperty(AbstractEnvironment.java:527) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.context.support.PropertySourcesPlaceholderConfigurer$1.getProperty(PropertySourcesPlaceholderConfigurer.java:132) ~[spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.context.support.PropertySourcesPlaceholderConfigurer$1.getProperty(PropertySourcesPlaceholderConfigurer.java:129) ~[spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:81) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.core.env.PropertySourcesPropertyResolver.getPropertyAsRawString(PropertySourcesPropertyResolver.java:71) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.core.env.AbstractPropertyResolver$1.resolvePlaceholder(AbstractPropertyResolver.java:239) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:147) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:236) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210) ~[spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.context.support.PropertySourcesPlaceholderConfigurer$2.resolveStringValue(PropertySourcesPlaceholderConfigurer.java:172) ~[spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:831) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1086) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    	... 17 common frames omitted

报这个错误的原因是，maven的filtering没有起作用，没有把占位符给替换掉。（大家可以执行mvn clean package，看看打包后的jar里面的application.properties文件，是否有替换占位符）

filtering无效的原因是，pom.xml继承了spring boot的依赖

<parent>
    	<groupId>org.springframework.boot</groupId>
    	<artifactId>spring-boot-starter-parent</artifactId>
    	<version>1.5.9.RELEASE</version>
    </parent>

点开这个依赖的pom.xml，我们发现

![20171218170845218][]

**spring boot把默认的占位符号$\{\}改成了@**

找到原因了，那怎么解决就很简单了。

方法一：

在pom.xml里面添加如下内容

方法二：

application.properties里面不用$\{\}，改成@

jdbc.driverClassName=@jdbc.driverClassName@
    jdbc.url=@jdbc.url@
    jdbc.username=@jdbc.username@
    jdbc.password=@jdbc.password@

方法三：

pom.xml不继承spring-boot-starter-parent，dependency里面配置全部的依赖和版本号（继承了之后，很多依赖不用写version）

方法四：

把

<parent>
    	<groupId>org.springframework.boot</groupId>
    	<artifactId>spring-boot-starter-parent</artifactId>
    	<version>1.5.9.RELEASE</version>
    </parent>

改成

<dependencyManagement>
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    			<version>1.5.9.RELEASE</version>
    			<type>pom</type>
    			<scope>import</scope>
    		</dependency>
    	</dependencies>
    </dependencyManagement>

[20171218170006533]: /images/20220603/4d93972805304d8984174c8cce5b94fd.png
[20171218170845218]: /images/20220603/91e21612aec44c899138bdee4f9de0c8.png