Good day, I'm working on a web application using Spring 4.1.1.RELEASE. All Spring configuration is done with annotations and it works fine except one thing:
I have a config.properties file in the project with these lines
cases.caseList.filter=test cases.caseList.numberOfCasesPerPage=50
I have a config class
@Configuration @ComponentScan(basePackageClasses={CaseConfig.class}) @PropertySource(value = "classpath:config.properties") public class CasesModuleTestContextConfig { ... }
And another class
@Component public class HttpRequestParamsToPaginationParams extends AbstractConverter<Map<String, String>, PaginationParams> { @Value("${cases.caseList.filter}") private String filter; @Value("${cases.caseList.numberOfCasesPerPage}") private Integer count; ... }
Value of property 'filter' is successfuly injected from the property resource. But I'm getting an exception on property 'count':
13:58:45.274 [main] WARN o.s.c.s.GenericApplicationContext - Exception encountered during context initialization - cancelling refresh attempt
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cz.pokus.core.test.config.ConversionServiceTestConfig': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.List cz.pokus.core.test.config.ConversionServiceTestConfig.converterList; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'httpRequestParamsToPaginationParams': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.lang.Integer cz.pokus.core.cases.converter.HttpRequestParamsToPaginationParams.count; nested exception is 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: "${cases.caseList.numberOfCasesPerPage}"
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334) ~[spring-beans-4.1.1.RELEASE.jar:4.1.1.RELEASE]
...
Caused by: org.springframework.beans.TypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'java.lang.Integer'; nested exception is java.lang.NumberFormatException: For input string: "${cases.caseList.numberOfCasesPerPage}"
...
Caused by: java.lang.NumberFormatException: For input string: "${cases.caseList.numberOfCasesPerPage}"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) ~[na:1.8.0_20]
at java.lang.Integer.parseInt(Integer.java:569) ~[na:1.8.0_20]
at java.lang.Integer.valueOf(Integer.java:766) ~[na:1.8.0_20]
...
When I change type of property 'count' to String it start working:
@Value("${cases.caseList.numberOfCasesPerPage}")
private String count;
I believe Spring is able to convert String to Integer when injecting value from property resource into a Integer property using @Value. I'v found examples where people use without complaining. Do you please have any ideas why it doesn't work for me?
Thanks a lot in advance.
If you are trying to access the property values using @Value("")
annotation, you should declare PropertySourcesPlaceholderConfigurer
Bean.
Try to add below snippet of code in your configuration class.
@Bean
public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
return new PropertySourcesPlaceholderConfigurer();
}
If you don't want to declare it, Try with org.springframework.core.env.Environment
class by autowiring it in your class, to get the property values.
@Autowired
private Environment environment;
public void readValues() {
System.out.println("Some Message:"
+ environment.getProperty("<Property Name>"));
}
In my case I foregot the $ sign into the annotation
@Value("{cases.caseList.filter}")
instead of
@Value("${cases.caseList.filter}")
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