Value annotation type casting to Integer from String

Question

I m trying to cast the output of a value to an integer    Value    api orders pingFrequency    private Integer pingFrequency    The above throws the error   org springframework beans TypeMismatchException       Failed to convert value of type  java lang String  to required type  java lang Integer    nested exception is java lang NumberFormatException       For input string    java lang Integer   api orders pingFrequency     I ve also tried  Value   java lang Integer   api orders pingFrequency     Google doesn t appear to say much on the subject   I d like to always be dealing with an integer instead of having to parse this value everywhere it s used   Workaround  I realize a workaround may be to use a setter method to run the conversion for me  but if Spring can do it I d rather learn something about Spring

User · Answer

I had the exact same situation  It was caused by not having a PropertySourcesPlaceholderConfigurer in the Spring context  which resolves values against the  Value annotation inside of classes   Include a property placeholder to solve the problem  no need to use Spring expressions for integers  the property file does not have to exist if you use ignore-resource-not-found  true      lt context property-placeholder location   path to my app properties      ignore-resource-not-found  true    gt

User · Answer

when use  Value  you should add  PropertySource annotation on Class  or specify properties holder in spring s xml file  eg    Component  PropertySource  classpath config properties   public class BusinessClass      Value    user name       private String name      Value    user age       private int age      Value    user registed false       private boolean registed      config properties  user name test user age 20 user registed true   this works   Of course  you can use placeholder xml configuration instead of annotation  spring xml   lt context property-placeholder location  classpath config properties   gt

User · Answer

I was looking for the answer on internet and I found the following   Value    new java text SimpleDateFormat    aDateFormat    parse    aDateStr       Date myDate    So in your case you could try with this   Value    new Integer    api orders pingFrequency       private Integer pingFrequency

User · Answer

Since using the  Value  quot new Long  quot myconfig quot   quot   with cast could throw error on startup if the config is not found or if not in the same expected number format We used the following approach and is working as expected with fail safe check   Configuration   public class MyConfiguration       Long DEFAULT MAX IDLE TIMEOUT   5l       Value  quot db timeoutInString quot      private String timeout      public Long getTimout             final Long timoutVal   StringUtil parseLong timeout           if  null    timoutVal                return DEFAULT MAX IDLE TIMEOUT                    return timoutVal

User · Answer

In my case  the problem was that my POST request was sent to the same url as GET  with get parameters using           and that parameters had the same name as form parameters  Probably Spring is merging them into an array and parsing was throwing error

User · Answer

This problem also occurs when you have 2 resources with the same file name  say  configurations properties  within 2 different jar or directory path configured within the classpath  For example   You have your  configurations properties  in your process or web application  jar  war or ear   But another dependency  jar  have the same file  configurations properties  in the same path  Then I suppose that Spring have no idea        where to get the property and just sends the property name declared within the  Value annotation

User · Answer

Assuming you have a properties file on your classpath that contains   api orders pingFrequency 4   I tried inside a  Controller   Controller public class MyController             Value    api orders pingFrequency        private Integer pingFrequency              With my servlet context containing     lt context property-placeholder location  classpath myprops properties    gt    It worked perfectly    So either your property is not an integer type  you don t have the property placeholder configured correctly  or you are using the wrong property key   I tried running with an invalid property value  4123   The exception I got is   java lang NumberFormatException  For input string   4123     which makes me think the value of your property is   api orders pingFrequency  java lang Integer   api orders pingFrequency

User · Answer

If you want to convert a property to an integer from properties file there are 2 solutions which I found   Given scenario  customer properties contains customer id   100 as a field and you want to access it in spring configuration file as integer The property customerId is declared as type int in the Bean Customer  Solution 1    x000D   x000D   lt property name  customerId  value    T java lang Integer  parseInt    customer id        gt  x000D   x000D   x000D    In the above line  the string value from properties file is converted to int type   solution 2  Use some other extension inplace of propeties For Ex - If your properties file name is              customer properties then make it customer details and in the configuration file use the below code   x000D   x000D   lt property name  customerId    value    customer id     gt  x000D   x000D   x000D

User · Answer

I had the same issue I solved using this  Refer this Spring MVC   Value annotation to get int value defined in   properties file   Value   propertyfileId propertyName     works

User · Answer

If you are using  Configuation then instantiate below static bean  If not static  Configutation is instantiated very early and and the BeanPostProcessors responsible for resolving annotations like  Value   Autowired etc  cannot act on it  Refer here   Bean public static PropertySourcesPlaceholderConfigurer propertyConfigurer        return new PropertySourcesPlaceholderConfigurer

[java] @Value annotation type casting to Integer from String

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