NullPointerException in the GeoRSS PollTask

[steve-at]

Hi there,

When using GeoRSS it comes to an NullPointerException in the GWC versions above 1.20. The reason is that the GeoRSSReaderFactory initializes the org.geowebcache.util.HttpClientBuilder with the default constructor and within the default constructor the clientBuilder is not initialized.
This leads to an NullPointerException within the georss.GeoRSSPollTask.

Here is a stacktrace of the issue.

java.lang.NullPointerException: Cannot invoke "org.apache.http.impl.client.HttpClientBuilder.build()" because "this.clientBuilder" is null
  at org.geowebcache.util.HttpClientBuilder.buildClient(HttpClientBuilder.java:126)
  at org.geowebcache.georss.GeoRSSReaderFactory.createReader(GeoRSSReaderFactory.java:51)
  at org.geowebcache.georss.GeoRSSPollTask.runPollAndLaunchSeed(GeoRSSPollTask.java:140)
  at org.geowebcache.georss.GeoRSSPollTask.run(GeoRSSPollTask.java:97)
  at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
  at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:358)
  at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
  at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
  at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
  at java.base/java.lang.Thread.run(Thread.java:1583)