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This article introduces the knowledge about "how to solve the problem of using @value annotation to get the value in application.xml configuration file". In the actual case operation process, many people will encounter such a dilemma. Next, let Xiaobian lead you to learn how to deal with these situations! I hope you can read carefully and learn something!

@value annotation error message is reported when the value of application.xml cannot be obtained

Today, I pulled down the code from the code cloud and suddenly found that the system could not run. The error message was as follows:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'shiroConfig': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'spring.cache.type' in value "${spring.cache.type}"

The development team has been busy writing business layer code recently. Generally speaking, they will not touch things in the configuration file. For some reason, this error appeared.

original code

Java code is as follows:

@Configurationpublic class ShiroConfig { @Value("${spring.cache.type}") private String cacheType; @Value("${server.session-timeout}") private int tomcatTimeout;}

Profile:

pom.xml Original file:

src/main/java **/*.xml cause of the problem

Incorrect resource settings in pom.xml

pom.xml modified:

src/main/java **/* thinking

More magical is that after modifying the pom file to start successfully, and then change it back to the original look, it will not report wrong. Maven clean, Rebuild Project and other operations can also be restarted. It's a little confusing.

expand reading

resources: Describes the location of resources in the project

targetPath: Specify which directory to build resources to, default is base directory

filtering: Specifies whether variable values in the filter file (i.e. *.property file defined in filters under build) are valid in this resource file, e.g. above specifies those variable values are invalid in the configuration file.

directory: Specify the directory of properties files. The build process needs to find it and put it under targetPath. The default directory is ${basedir}/src/main/resources.

includes: Specifies the patterns that contain files that conform to the style and files in the directory directory will be included in the project resource file.

excludes: specifies patterns to exclude, if includes and excludes conflict, then excludes wins, those files that match the conflicting patterns are excluded.

testResources: This module contains test resource elements, the content definition is similar to resources, the difference is that the default test resource path is ${basedir}/src/test/resources, test resources are not deployed.

In general:

If resources is not specified, the.class file under src/main/java and the.xml file under src/main/resources under classspath are automatically placed in the folder under package under classes folder of target.

If resources is set, then the default will be invalidated and the specified includes and excludes will prevail.

For example, in order to include the.java source file in the packaged jar package.

Tool class @Value does not get value

@Value cannot be taken as a value in tool class, as shown in the following figure.

The reason is the new object.

changed to

EncryptIdCardUtil class method changed to non-static method, ConnectService class changed from new to @Autowired injection

RiskService is also changed from directly calling static methods in EncryptIdCardUtil to EncryptIdCardUtil class @Autowired injection

is OK

"How to solve the problem of using @value annotation to get the value in application.xml configuration file" is introduced here. Thank you for reading. If you want to know more about industry-related knowledge, you can pay attention to the website. Xiaobian will output more high-quality practical articles for everyone!

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