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Created attachment 148144 [details] profiler snapshot I'm testing netbeans from current core-main. While trying to get a clear profile result, I noticed, that the welcome module looks badly broken. I get this on command line: SEVERE [org.netbeans.modules.welcome.content.RSSFeed]: Error message:Vorzeitiges Dateiende. SEVERE [org.netbeans.modules.welcome.content.RSSFeed]: Line number:1 SEVERE [org.netbeans.modules.welcome.content.RSSFeed]: Column number:1 SEVERE [org.netbeans.modules.welcome.content.RSSFeed]: Public ID:null SEVERE [org.netbeans.modules.welcome.content.RSSFeed]: System ID:null a lot! And the compile snaphshot show not only a few threads spawned by the welcome screen. This noise doesn't make it easier to spot the real problems.
Please provide steps to reproduce and reopen. Under normal circumstances there is at most one reload attempt for each RSS feed.
Created attachment 151842 [details] messages log This is what seems to happen: 1. The url is tried: http://www.netbeans.org/mtmo.xml?unique=01baf064f-eec8-4a96-9a10-4e8ba00c3891 2. This gets a http 302 to: https://netbeans.org/mtmo.xml?unique=01baf064f-eec8-4a96-9a10-4e8ba00c3891 3. The new request (httpCon, RSSFeed.java line 231 has these Request Properties: If-Modified-Since => [Wed, 30 Jul 2014 14:01:59 GMT] Accept-Encoding => [gzip, deflate] 4. The server returns an 304 (this looks sane from the stream contents) 5. Netbeans reads the input file -- I checked the file - it is empty! 6. InputSource is created from an empty file and returned 7. This is fed into the XMLReader in CombinationRSSFeed.java line 94 8. The exception handler around line 370 is called (isContentCached()...) From there clearCache is called and this looks broken - url1 in CombinationRSSFeed.java uses the original URL url1 (that is the URL from step 1) to clean the cache, and in RSSFeed#findInputSource the cache file is created/calculated based on the redirected url (from step 2). 9. The system now asumes the cache cleaned and issues a reload (line 371 in RSSFeed.java). From there the whole retrieval is started again (and directly creating a new Thread). => Boom
Reopening as problem is still present and an explanation was found.
To fix the situation for me, I manually recreated the file (deleting it does exactly nothing): wget -O /home/matthias/.cache/netbeans/8.0/welcome/netbeans.org/mtmo.xmlunique=01baf064f-eec8-4a96-9a10-4e8ba00c3891 https://netbeans.org/mtmo.xml?unique=01baf064f-eec8-4a96-9a10-4e8ba00c3891