spring boot could not resolve placeholder in string value 問題解決方法
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'hosts' in string value "${db.hosts}"
問題的產生是由於有多個properties檔案造成的，如果再第一個properties檔案中沒有找，就不認為沒有了，不繼續找下一個properties檔案
解決辦法如下：
方法 一、
在Application中加入一個靜態方法
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
import org.springframework.core.io.ClassPathResource;
@Configuration
@SpringBootApplication
@ComponentScan
public class TestApplication {
public final static void main(String[] args) {
SpringApplication.run(VfcadaptorApplication.class, args);
}
@Bean
public static PropertySourcesPlaceholderConfigurer placeholderConfigurer() {
PropertySourcesPlaceholderConfigurer c = new PropertySourcesPlaceholderConfigurer();
c.setIgnoreUnresolvablePlaceholders(true);
return c;
}
}
方法二、 統一為屬性name加字首
<span lang="EN-US" font-size:11.5pt;font-family:consolas;"="">app.datasource.foo.type=daffaDataSource
app.datasource.foo.status =30
那就需要在類檔案上加註解 @ConfigurationProperties("app.datasource.foo")
@ConfigurationProperties("app.datasource.foo")
Publicclass AA{
PrivateString type;
PrivateString
...
}