Spring Boot Value Properties

Question

I have a Spring Boot application and in one of the classes  I try to reference a property from the application properties file using  Value  But  the property does not get resolved  I have looked at similar posts and tried following the suggestions  but that didn t help  The class is    Configuration  ComponentScan  EnableAutoConfiguration public class PrintProperty       Value    file directory      private String fileDirectory     public void print         System out println fileDirectory           I have the property file directory in application properties  I have other fields as well

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I  d like to mention  that I used spring boot version 1 4 0 and since this version you can only write    Component public class MongoConnection     Value    spring data mongodb host    private String mongoHost    Value    spring data mongodb port    private int mongoPort    Value    spring data mongodb database    private String mongoDB      Then inject class whenever you want   EDIT   From nowadays I would use  ConfigurationProperties because you are able to inject property values in your POJOs  Keep hierarchical sort above your properties  Moreover  you can put validations above POJOs attributes and so on  Take a look at the link

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To read the values from application properties we need to just annotate our main class with  SpringBootApplication and the class where you are reading with  Component or variety of it  Below is the sample where I have read the values from application properties and it is working fine when web service is invoked  If you deploy the same code as is and try to access from http   localhost 8080 hello you will get the value you have stored in application properties for the key message   package com example   import org springframework beans factory annotation Value  import org springframework boot SpringApplication  import org springframework boot autoconfigure SpringBootApplication  import org springframework web bind annotation RequestMapping  import org springframework web bind annotation RestController    SpringBootApplication  RestController public class DemoApplication         Value    message        private String message       public static void main String   args            SpringApplication run DemoApplication class  args               RequestMapping   hello       String home             return message             Try and let me know

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I had the same issue get value for my property in my service class  I resolved it by using  ConfigurationProperties instead of  Value    create a class like this        import org springframework boot context properties ConfigurationProperties        ConfigurationProperties prefix    file       public class FileProperties           private String directory           public String getDirectory                 return directory                     public void setDirectory String dir                this directory   dir                      add the following to your BootApplication class         EnableConfigurationProperties           FileProperties class           Inject FileProperties to your PrintProperty class  then you can get hold of the property through the getter method

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Your problem is that you need a static PropertySourcesPlaceholderConfigurer Bean definition in your configuration  I say static with emphasis  because I had a non-static one and it didn t work    Bean public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer         return new PropertySourcesPlaceholderConfigurer

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Make sure your application properties file is under src main resources application properties  Is one way to go  Then add  PostConstruct as follows  Sample Application properties  file directory   somePlaceOverHere   Sample Java Class   ComponentScan public class PrintProperty       Value    file directory      private String fileDirectory      PostConstruct   public void print         System out println fileDirectory           Code above will print out  somePlaceOverhere

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I had the similar issue and the above examples doesn t help me to read properties  I have posted the complete class which will help you to read properties values from application properties file in SpringBoot application in the below link   Spring Boot - Environment  Autowired throws NullPointerException

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I had the same problem like you  Here s my error code    Component public class GetExprsAndEnvId        Value  hello       private String Mysecret        public GetExprsAndEnvId             System out println  construct                public void print            System out println this Mysecret               public String getMysecret             return Mysecret             public void setMysecret String mysecret            Mysecret   mysecret            This is no problem like this  but  we need to use it like this    Autowired private GetExprsAndEnvId getExprsAndEnvId    not like this   getExprsAndEnvId   new GetExprsAndEnvId      Here  the field annotated with  Value is null because Spring doesn t know about the copy of GetExprsAndEnvId that is created with new and didn t know to how to inject values in it

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You haven t included package declarations in the OP but it is possible that neither  SpringBootApplication nor  ComponentScan are scanning for your  Component    The  ComponentScan Javadoc states      Either basePackageClasses or basePackages  or its alias value  may be   specified to define specific packages to scan  If specific packages   are not defined  scanning will occur from the package of the class   that declares this annotation    ISTR wasting a lot of time on this before and found it easiest to simply move my application class to the highest package in my app s package tree   More recently I encountered a gotcha were the property was being read before the value insertion had been done  Jesse s answer helped as  PostConstruct seems to be the earliest you can read the inserted values  and of course you should let Spring call this

[spring] Spring Boot @Value Properties

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