我正在將我的專案從 springboot 2.4.4 升級到 2.6.7，但是在較新的版本中，由于回圈依賴，我收到了這個運行時錯誤：
***************************
APPLICATION FAILED TO START
***************************
Description:
The dependencies of some of the beans in the application context form a cycle:
webMvcMetricsFilter defined in class path resource [org/springframework/boot/actuate/autoconfigure/metrics/web/servlet/WebMvcMetricsAutoConfiguration.class]
┌─────┐
| prometheusMeterRegistry defined in class path resource [org/springframework/boot/actuate/autoconfigure/metrics/export/prometheus/PrometheusMetricsExportAutoConfiguration.class]
↑ ↓
| meterRegistryConfig defined in URL [jar:file:/Users/myname/Documents/repo/myrepo/my-module/bin/my-module.jar!/com/mypackage/app/metrics/MeterRegistryConfig.class]
└─────┘
這是我的MeterRegistryConfig類：
import io.micrometer.core.instrument.Meter;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.config.MeterFilter;
import io.micrometer.core.instrument.distribution.DistributionStatisticConfig;
import org.jetbrains.annotations.NotNull;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class MeterRegistryConfig implements MeterFilter {
@Autowired
public MeterRegistryConfig(final MeterRegistry registry) {
registry
.config()
.meterFilter(
new MeterFilter() {
@Override
public DistributionStatisticConfig configure(
@NotNull final Meter.Id id, @NotNull final DistributionStatisticConfig config) {
return DistributionStatisticConfig.builder()
.percentilesHistogram(true)
.percentilePrecision(3)
.build()
.merge(config);
}
});
}
}
我不確定為什么新版本而不是舊版本會發生這種回圈依賴。誰能幫我解決它？
uj5u.com熱心網友回復：
Spring Boot 會自動將每個MeterFilterbean 添加到自動配置中，因此不需要MeterRegistry您當前的形式。MeterRegistryConfig我會用一個@Configuration定義MeterFilterbean 的類來替換它。像這樣的東西：
import io.micrometer.core.instrument.Meter;
import io.micrometer.core.instrument.config.MeterFilter;
import io.micrometer.core.instrument.distribution.DistributionStatisticConfig;
import org.jetbrains.annotations.NotNull;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
class MeterRegistryConfig {
@Bean
MeterFilter yourMeterFilter() {
return new MeterFilter() {
@Override
public DistributionStatisticConfig configure(
@NotNull final Meter.Id id,
@NotNull final DistributionStatisticConfig config) {
return DistributionStatisticConfig.builder()
.percentilesHistogram(true)
.percentilePrecision(3)
.build()
.merge(config);
}
};
}
}
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