Spring Scheduler stops unexpectedly

Since this question got so many votes, I’ll post what the (probably very specific) solution to my problem was.

We are using the Apache HttpClient library to make calls to remote services in the scheduled jobs. Unfortunately there are no default timeouts set when performing requests. After setting

connectTimeout
connectionRequestTimeout
socketTimeout

to 30 seconds the problem was gone.

int timeout = 30 * 1000; // 30 seconds
RequestConfig requestConfig = RequestConfig.custom()
        .setConnectTimeout(timeout)
        .setConnectionRequestTimeout(timeout)
        .setSocketTimeout(timeout).build();
HttpClient client = HttpClients.custom()
        .setDefaultRequestConfig(requestConfig).build();