Could not resolve placeholder(java.lang.IllegalArgumentException: ) - spring-boot

Question

I can't set properties in the application.properties that would then be integrated via #Value
server.port=8099
spring.data.mongodb.database=mongo-spring
spring.data.mongodb.username=root
spring.data.mongodb.password=root
#spring.data.mongodb.host=192.168.99.100
spring.data.mongodb.host=192.168.99.109
spring.data.mongodb.port=27017
#spring.data.mongodb.uri=mongodb://192.168.99.100:27017/mongo-spring
#spring.data.mongodb.repositories.enabled=true
############################################
#--------reCaptcha Google-----------------
#############################################
#Site key - Use this in the HTML code your site serves to users.
#Secret key - Use this for communication between your site and Google. Be sure to keep it a secret.
apiUrl=https://www.google.com/recaptcha/api/siteverify
api.prefix=/api/**
header.cors.origins.allow=http://10.0.0.1:8080 , http://10.10.8.2:8080
header.cors.methods.allow=GET, PUT, POST
#Configuration
public class CorsGlobalConfiguration {
#Value("${api.prefix}")
private String apiPrefix;
#Value("${header.cors.origins.allow}")
private String [] headerCorsOriginsAllow;
#Value("${header.cors.methods.allow}")
private String [] headerCorsMethodsAllow;
#Bean
public WebMvcConfigurer corsConfig() {
return new WebMvcConfigurer() {
#Override
public void addCorsMappings(CorsRegistry registry) {
registry.addMapping(apiPrefix)
.allowedOrigins(headerCorsOriginsAllow)
.allowedMethods(headerCorsMethodsAllow);
}
};
}
}
------------------------------------------------------------------------------- Test set: com.spring.mongo.SpringMongoApplicationTests
------------------------------------------------------------------------------- Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 6.081
s <<< FAILURE! - in com.spring.mongo.SpringMongoApplicationTests
contextLoads Time elapsed: 0.001 s <<< ERROR!
java.lang.IllegalStateException: Failed to load ApplicationContext
Caused by: org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'corsGlobalConfiguration': Injection of
autowired dependencies failed; nested exception is
java.lang.IllegalArgumentException: Could not resolve placeholder
'api.prefix' in value "${api.prefix}" Caused by:
java.lang.IllegalArgumentException: Could not resolve placeholder
'api.prefix' in value "${api.prefix}"
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.spring.mongo</groupId>
<artifactId>spring-mongo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-mongo</name>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<version.mapstruct>1.3.0.Final</version.mapstruct>
<version.apache.maven.plugins>3.8.1</version.apache.maven.plugins>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.retry</groupId>
<artifactId>spring-retry</artifactId>
<version>1.3.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct</artifactId>
<version>${version.mapstruct}</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>29.0-jre</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</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-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-core</artifactId>
<version>2.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>de.flapdoodle.embed</groupId>
<artifactId>de.flapdoodle.embed.mongo</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>${version.apache.maven.plugins}</version>
<groupId>org.apache.maven.plugins</groupId>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
<annotationProcessorPaths>
<path>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct-processor</artifactId>
<version>${version.mapstruct}</version>
</path>
</annotationProcessorPaths>
</configuration>
</plugin>
</plugins>
</build>
</project>
Update-1
I converted the application.properties in the application.in YML format.
An error , disappeared.
But now in the development environment, I can't view the value of a variable by clicking on the #Value expression
And I get another error during an application.
2020-08-07 22:35:15.244 WARN 48300 --- [ main]
ConfigServletWebServerApplicationContext : Exception encountered
during context initialization - cancelling refresh attempt:
org.springframework.beans.factory.BeanDefinitionStoreException: Failed
to parse configuration class
[com.spring.mongo.SpringMongoApplication]; nested exception is
java.io.FileNotFoundException: class path resource
[application.properties] cannot be opened because it does not exist
2020-08-07 22:35:15.262 ERROR 48300 --- [ main]
o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.BeanDefinitionStoreException: Failed
to parse configuration class
[com.spring.mongo.SpringMongoApplication]; nested exception is
java.io.FileNotFoundException: class path resource
[application.properties] cannot be opened because it does not exist
I added into pom.xml
pom.xml
<build>
<resources>
<resource>
<directory>config</directory>
<targetPath>${project.build.outputDirectory}</targetPath>
<includes>
<include>application.yml</include>
</includes>
</resource>
</resources>
Now, I again get the error:
java.lang.IllegalArgumentException: Could not resolve placeholder
Why?
The encoding all project is UTF-8.
Everything worked before. Now the #Value annotation doesn't work
Does anybody have any ideas?