name相同问题
在使用@FeignClient的时候，发现多个@FeignClient中的name相同就无法启动，当然了，这是因为bean名称重复了，创建bean的时候报的错，但是如何解决呢?
A bean with that name has already been defined and overriding is disabled
可以配置不同的contextId来进行解决
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| @FeignClient(name = "SPRINGCLOUD2-PROVIDER",contextId = "DeptClient",fallbackFactory = DeptClientFallBackFactory.class)
public interface DeptClient {
@GetMapping(value = "/dept/get/{id}")
CommonResult<Dept> get(@PathVariable("id") long id);
@GetMapping("/timeout")
String timeout();
}
@FeignClient(name = "SPRINGCLOUD2-PROVIDER",contextId = "DeptClient1",fallbackFactory = DeptClientFallBackFactory.class)
public interface DeptClient1 {
@GetMapping(value = "/dept/get/{id}")
CommonResult<Dept> get(@PathVariable("id") long id);
@GetMapping("/timeout")
String timeout();
}
|
为什么可以这样解决呢？
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| String name = getClientName(attributes);
registerClientConfiguration(registry, name,
attributes.get("configuration"));
|
在FeignClientsRegistrar中进行@FeignClient注册时，对于bean的名称是调用getClientName(Map<String, Object> client)方法来获取的
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| private String getClientName(Map<String, Object> client) {
if (client == null) {
return null;
}
String value = (String) client.get("contextId");
if (!StringUtils.hasText(value)) {
value = (String) client.get("value");
}
if (!StringUtils.hasText(value)) {
value = (String) client.get("name");
}
if (!StringUtils.hasText(value)) {
value = (String) client.get("serviceId");
}
if (StringUtils.hasText(value)) {
return value;
}
throw new IllegalStateException("Either 'name' or 'value' must be provided in @"
+ FeignClient.class.getSimpleName());
}
|
代码也比较简单，可以看到是先获取的contextId，如果配置了 contextId 就会用 contextId，如果没有配置就会去 value 然后是 name 最后是 serviceId
获取到clientName之后进行bean注册
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| private void registerClientConfiguration(BeanDefinitionRegistry registry, Object name,
Object configuration) {
BeanDefinitionBuilder builder = BeanDefinitionBuilder
.genericBeanDefinition(FeignClientSpecification.class);
builder.addConstructorArgValue(name);
builder.addConstructorArgValue(configuration);
registry.registerBeanDefinition(
name + "." + FeignClientSpecification.class.getSimpleName(),
builder.getBeanDefinition());
}
|
拼接的beanName就是clientName.FeignClientSpecification