英文:
Can @Retry and @Recover be used when using error handler in RestTemplate?
问题
使用Rest Template调用REST API。为了处理异常，我使用了自定义的ErrorHandler。
我还使用了@Retry和@Recover。当首次从URL出现ConnectException时，应该在第二个URL上进行调用。然而，尽管我已经定义了一个recover方法，但在经过3次尝试后，仍然抛出ExhaustedRetry 'could not find Recover method'异常。
这是因为我使用了一个ErrorHandler，而没有显式地抛出异常吗？
以下是我的代码框架 -
@Component
public class TestCall {
@Autowired
private RestTemplate restTemplate;
private boolean flag = false;
@Retryable(value = {ConnectException.class}, maxAttempts = 3, backoff = @Backoff(delay = 96, maxDelay = 158, random = true))
public void callAPI() {
restTemplate.setErrorHandler(new RestErrorHandler());
if (!flag) {
// 调用第一个URL
flag = !flag;
restTemplate.exchange(url1, HttpMethod.POST, body, Response.class);
} else {
// 如果第一个URL因ConnectException失败，则重试第二个URL
flag = !flag;
restTemplate.exchange(url2, HttpMethod.POST, body, Response.class);
}
}
@Recover
public void recover(ConnectException exception) {
System.out.println("在recover方法中");
}}
错误处理程序 -
```java
public class RestErrorHandler implements ResponseErrorHandler {
@Override
public boolean hasError(ClientHttpResponse response) throws IOException {
return false;
}
@Override
public void handleError(ClientHttpResponse response) throws IOException {
// 在这里记录错误
}
}
在重试了3次后，如果第4次抛出异常，recover方法不会被调用。
英文:
I am using Rest Template to call a rest API. To handle the exceptions, I am using a custom ErrorHandler.
I have also used @Retry and @Recover. When at first there is a ConnectException from the URL, the call should be made on the second URL. However after 3 attempts, the ExhaustedRetry 'could not find Recover method' exception is being thrown, even though I have defined a recover method.
Is it because I am using an ErroHandler and not explicitly throwing the exception?
Below is a skeleton of my code -
@Component
public class TestCall {
@Autowired
private RestTemplate restTemplate;
private boolean flag = false;
@Retryable(value = {ConnectException.class}, maxAttempts = 3, backoff = @Backoff(delay = 96, maxDelay = 158, random = true))
public void callAPI() {
restTemplate.setErrorHandler(new RestErrorHandler());
if (!flag) {
// calling first URL
flag = !flag;
restTemplate.exchange(url1, HttpMethod.POST, body, Response.class);
} else {
// retrying with 2nd url if 1st url fails with ConnectException
flag = !flag;
restTemplate.exchange(url2, HttpMethod.POST, body, Response.class);
}
}
@Recover
public void recover(ConnectException exception) {
System.out.println("In recover method");
}}
The error handler -
public class RestErrorHandler implements ResponseErrorHandler {
@Override
public boolean hasError(ClientHttpResponse response) throws IOException {
return false;
}
@Override
public void handleError(ClientHttpResponse response) throws IOException {
//logging the error here
}
}
After retrying 3 times, if the exception is thrown the 4th team, the recover method is not being called.
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