英文:
@Value("${welcome}) in springboot is throwing illegal argument exception and could not resolve placeholder
问题
@RestController
Class MyController{
@Value("${welcome}")
private String welcome;
@RequestMapping("/greet")
public String greetHim(){
return welcome;
}
}
application.properties:
welcome=welcomeEla
以上代码抛出了非法参数异常，并显示无法解析值中的占位符'welcome'，其值为"${welcome}"。
如果我在'$'和'{'之间加入一个空格，就不会抛出任何异常，但它会获取null值。
我还尝试过将环境变量与@PropertySource("application.properties")一起用作类上的autowired，但它也获取了null值（env.getProperty("welcome")）。
有谁可以帮我解决这个问题吗？提前致谢
英文:
@RestController
Class MyController{
@Value("${welcome}")
private String welcome;
@RequestMapping("/greet")
public String greetHim(){
return welcome;
}
}
application.properties:
welcome=welcomeEla
The above code is throwing illegal argument exception and saying could not resolve placeholder 'welcome' in value "${welcome}"
If I give a space between '$' and '{' it is not throwing any exception but it is fetching null value.
Also I tried with environment variable as autowired with @PropertySource("application.properties") over the Class it was also fetching null value (env.getProperty("welcome"))
Can anybody help me in this?
Thanks in advance
答案1
得分: -1
首先，
ApplicationContextProvider appContext = new ApplicationContextProvider();
Environment env = appContext.getApplicationContext().getEnvironment();
// env.getProperty() 正常工作！！！
String temp = env.getProperty("welcome");
System.out.println(temp);
你运行这段代码。确保它正常工作。如果它正常工作，你可以尝试使用 @Value("${welcome.toString()}") 吗？
英文:
Firstly ,
ApplicationContextProvider appContext = new ApplicationContextProvider();
Environment env = appContext.getApplicationContext().getEnvironment();
// env.getProperty() works!!!
String temp = env.getProperty("welcome");
System.out.println(temp) ;
you run this code. And make sure it works. Do you try @Value("${welcome.toString()}") if it works
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