Obtaining instance of ConfigurationProperties without using @Autowire

Question

Is there a way to obtain a bean annotated with @ConfigurationProperties annotation by not using the @Autowire annotation, but by rather providing a prefix?

I have this constraint annotation, where I am passing the name of the property that helps with decision making with regards to validation. By knowing the fully qualified name of the property, I would like to check out the value of that key

score 2 · Accepted Answer · answered Jun 10 '19 at 19:11

2

By knowing the fully qualified name of the property, I would like to check out the value of that key

Then go get the property:

@Autowired
private Environment env;

// method here
    String value = this.env.getProperty(propName);

answered Jun 10 '19 at 19:11

Andreas

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Nice, can I also set the variable using a similar approach? – Ihor M. Jun 10 '19 at 19:47
@IhorM. See [this answer](https://stackoverflow.com/a/41192323/5221149) – Andreas Jun 10 '19 at 19:51
see my answer below on how to override a property – Ihor M. Jun 13 '19 at 18:56

score 0 · Answer 2 · answered Jun 13 '19 at 18:55

In order to override a property and then to roll it back:

protected void overrideProperties(Map<String, String> overrideMap) {
    log.info("Overriding properties = {}", overrideMap);
    Environment env = appContext.getEnvironment();
    if (env instanceof ConfigurableEnvironment) {
        ConfigurableEnvironment confEnv = (ConfigurableEnvironment) env;
        MutablePropertySources sources = confEnv.getPropertySources();
        // removing in case rollback was not done
        if (sources.contains(TEST_RESOURCE_PROPERTIES_OVERRIDE_NAME)) {
            sources.remove(TEST_RESOURCE_PROPERTIES_OVERRIDE_NAME);
        }
        Properties overrides = new Properties();
        overrides.putAll(overrideMap);
        sources.addFirst(new PropertiesPropertySource(TEST_RESOURCE_PROPERTIES_OVERRIDE_NAME, overrides));
        // this triggers changes in beans annotated with @ConfigurationProperties and updates @Value fields
        appContext.publishEvent(new EnvironmentChangeEvent(overrideMap.keySet()));
    }
    // this should never happen
    else {
        log.info("Unable to override properties as Environment is not of type ConfigurableEnvironment");
    }
}

protected void rollbackOverriddenProperties(Map<String, String> overrideMap) {
    log.info("Rolling back properties = {}", overrideMap);
    Environment env = appContext.getEnvironment();
    if (env instanceof ConfigurableEnvironment) {
        ConfigurableEnvironment confEnv = (ConfigurableEnvironment) env;
        MutablePropertySources sources = confEnv.getPropertySources();
        sources.remove(TEST_RESOURCE_PROPERTIES_OVERRIDE_NAME);
        // this triggers changes in beans annotated with @ConfigurationProperties and updates @Value fields
        appContext.publishEvent(new EnvironmentChangeEvent(overrideMap.keySet()));
    }
    // this should never happen
    else {
        log.info("Unable to rollback overridden properties as Environment is not of type ConfigurableEnvironment");
    }
}

Obtaining instance of ConfigurationProperties without using @Autowire

2 Answers2