I have written a spring boot micro-service and a REST client. The client is a part of another module and make RESTful calls to the micro-service. The micro-service registers with the Eureka registry and I want my client (Which is not a spring boot project) to use the Eureka to query and get the service endpoints.
My problem is since the client is not a Spring-Boot applications I can not use the annotations like @SpringBootApplication
, @EnableDiscoveryClient
and the DiscoveryClient
is not get auto wired to the application. Is there anyway to manually auto-wire the DiscoveryClient
bean to the client without using the annotations ?
Well this is how I did It. Basically it is a lot easier than I anticipated. The following was copied from Netflix eureka project.
DiscoveryManager.getInstance().initComponent(new MyDataCenterInstanceConfig(), new DefaultEurekaClientConfig());
String vipAddress = "MY-SERVICE";
InstanceInfo nextServerInfo = null;
try {
nextServerInfo = DiscoveryManager.getInstance()
.getEurekaClient()
.getNextServerFromEureka(vipAddress, false);
} catch (Exception e) {
System.err.println("Cannot get an instance of example service to talk to from eureka");
System.exit(-1);
}
System.out.println("Found an instance of example service to talk to from eureka: "
+ nextServerInfo.getVIPAddress() + ":" + nextServerInfo.getPort());
System.out.println("healthCheckUrl: " + nextServerInfo.getHealthCheckUrl());
System.out.println("override: " + nextServerInfo.getOverriddenStatus());
System.out.println("Server Host Name "+ nextServerInfo.getHostName() + " at port " + nextServerInfo.getPort() );
Also you have to add a configuration file to the class path. Eureka client uses this file to read the information about the eureka servers.
eureka.preferSameZone=true
eureka.shouldUseDns=false
eureka.serviceUrl.default=http://localhost:8761/eureka/
eureka.decoderName=JacksonJson
Also you have to provide the eureka client as a dependency. Eureka1 supports JDK7 though some part of it has been built with JDK8. However I had to provide older versions of "archaius-core" and "servo-core" to make it run with JDK7.
<dependency>
<groupId>com.netflix.archaius</groupId>
<artifactId>archaius-core</artifactId>
<version>0.7.3</version>
</dependency>
<dependency>
<groupId>com.netflix.servo</groupId>
<artifactId>servo-core</artifactId>
<version>0.10.0</version>
</dependency>
Eureka2 fully supports JDK7.
Either you use the netflix-eureka-client without spring-cloud and have to configure all by yourself (which means duplicating EurekaDiscoveryClientConfiguration)
Or you could run a sidecar service. The sidecar includes a zuul-proxy which would proxy the services discovered by eureka. Have a look int the Spring Cloud Docs - Polyglot support with Sidecar
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