我正在使用@RefreshScope注释测试一个针对spring-cloud的原型。我为此使用了一个外部属性文件。我已经在运行时参数中提供并配置了它。
pom.xml依赖项
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.1.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.proto.reload</groupId>
<artifactId>CachingService</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>CachingService</name>
<description>Demo project for cache</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-context</artifactId>
<version>1.1.8.RELEASE</version>
</dependency>
<!-- <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-config-client</artifactId>
<version>1.1.3.RELEASE</version> </dependency> -->
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
这是主班
package com.proto.reload;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.ApplicationPidFileWriter;
@SpringBootApplication
public class CachingServiceApplication {
public static void main(String[] args) {
if (args.length == 0) {
System.out.println("Invalid Commandline argument. Please provide Consumer Properties file.");
System.exit(0);
}
new SpringApplicationBuilder(CachingServiceApplication.class)
.listeners(new ApplicationPidFileWriter())
.properties("spring.config.name:" + args[0].replaceAll(".properties", ""))
.build()
.run(args);
while (true) {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(ConfigClass.getName());
}
}
}
具有@RefreshScope批注的配置类
package com.proto.reload;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.context.annotation.Configuration;
@Configuration
@RefreshScope
public class ConfigClass {
private static String name;
public static String getName() {
return name;
}
@Value("${app.prop.name}")
public void setName(String name) {
this.name = name;
}
}
这是我要通过参数传递的属性文件
app.prop.name=FirstOldValue
spring.pid.file=TestOne.pid
运行此代码时,出现以下错误。
12:38:41.051 [main] DEBUG org.springframework.boot.context.logging.ClasspathLoggingApplicationListener - Application failed to start with classpath: [file:/C:/Program%20Files/Java/jre1.8.0_191/lib/resources.jar, file:/C:/Program%20Files/Java/jre1.8.0_191/lib/rt.jar, file:/C:/Program%20Files/Java/jre1.8.0_191/lib/jsse.jar, file:/C:/Program%20Files/Java/jre1.8.0_191/lib/jce.jar, file:/C:/Program%20Files/Java/jre1.8.0_191/lib/charsets.jar, file:/C:/Program%20Files/Java/jre1.8.0_191/lib/jfr.jar, file:/C:/Program%20Files/Java/jre1.8.0_191/lib/ext/access-bridge-64.jar, file:/C:/Program%20Files/Java/jre1.8.0_191/lib/ext/cldrdata.jar, ...]
12:38:41.105 [main] ERROR org.springframework.boot.SpringApplication - Application run failed
java.lang.NoSuchMethodError: org.springframework.boot.builder.SpringApplicationBuilder.<init>([Ljava/lang/Object;)V
at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext(BootstrapApplicationListener.java:120)
at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:84)
at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:62)
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127)
at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:75)
at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54)
at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:347)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:306)
at com.proto.reload.CachingServiceApplication.main(CachingServiceApplication.java:19)
我以错误的方式使用@RefreshScope吗? 当我删除依赖项和@RefreshScope时,此代码可以正常工作,但在运行时不会更新属性值。我的目标是在运行时加载修改后的属性值。
答案 0 :(得分:1)
1.1.8.RELEASE
for Spring Cloud是Camden Release火车的一部分,该火车适用于Spring Boot 1.4.x
版本。
请参阅Release Trains
部分,以了解用于您的Spring Boot版本的发行版
https://spring.io/projects/spring-cloud
当前它们是
发布火车启动版本
格林威治2.1.x
Finchley 2.0.x
Edgware 1.5.x
Dalston 1.5.x
在使用Spring Boot 2.1.1时,您的依赖项管理应如下所示,请注意,因为格林威治(Greenwich)没有RELEASE
,但您需要添加里程碑存储库。
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>http://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Greenwich.RC2</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-context</artifactId>
</dependency>
</dependencies>
答案 1 :(得分:-1)
添加云上下文相关性,然后重试
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-context</artifactId>
<version>1.1.8.RELEASE</version>
</dependency>
更新: 在同一元素上使用@Configuration和@RefreshScope只是一个无效的用例。按照此URL线程:https://github.com/spring-cloud/spring-cloud-config/issues/43