Stack trace
SEVERE [org.openide.util.RequestProcessor]: Error in RequestProcessor org.netbeans.modules.maven.repository.RepositoryNode$RefreshIndexAction$1
java.lang.IllegalArgumentException: number of workunits cannot be negative
	at org.netbeans.modules.progress.spi.InternalHandle.toDeterminate(InternalHandle.java:193)
	at org.netbeans.api.progress.ProgressHandle.switchToDeterminate(ProgressHandle.java:134)
	at org.netbeans.modules.maven.indexer.RemoteIndexTransferListener.transferStarted(RemoteIndexTransferListener.java:105)
	at org.apache.maven.wagon.events.TransferEventSupport.fireTransferStarted(TransferEventSupport.java:104)
	at org.apache.maven.wagon.AbstractWagon.fireGetStarted(AbstractWagon.java:543)
	at org.apache.maven.wagon.AbstractWagon.getTransfer(AbstractWagon.java:306)
	at org.apache.maven.wagon.AbstractWagon.getTransfer(AbstractWagon.java:287)
	at org.apache.maven.wagon.StreamWagon.getIfNewer(StreamWagon.java:97)
	at org.apache.maven.wagon.StreamWagon.get(StreamWagon.java:61)
	at org.apache.maven.index.updater.WagonHelper$WagonFetcher.retrieve(WagonHelper.java:219)
	at org.apache.maven.index.updater.WagonHelper$WagonFetcher.retrieve(WagonHelper.java:201)
	at org.apache.maven.index.updater.DefaultIndexUpdater.loadIndexDirectory(DefaultIndexUpdater.java:191)
	at org.apache.maven.index.updater.DefaultIndexUpdater.access$300(DefaultIndexUpdater.java:76)
	at org.apache.maven.index.updater.DefaultIndexUpdater$LuceneIndexAdaptor.setIndexFile(DefaultIndexUpdater.java:642)
	at org.apache.maven.index.updater.DefaultIndexUpdater.fetchAndUpdateIndex(DefaultIndexUpdater.java:862)
	at org.apache.maven.index.updater.DefaultIndexUpdater.fetchAndUpdateIndex(DefaultIndexUpdater.java:157)
	at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.indexLoadedRepo(NexusRepositoryIndexerImpl.java:452)
	at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.access$200(NexusRepositoryIndexerImpl.java:113)
	at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl$3.run(NexusRepositoryIndexerImpl.java:519)
	at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl$3.run(NexusRepositoryIndexerImpl.java:513)
	at org.openide.util.Mutex.writeAccess(Mutex.java:404)
	at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.indexRepo(NexusRepositoryIndexerImpl.java:513)
	at org.netbeans.modules.maven.indexer.api.RepositoryIndexer.indexRepo(RepositoryIndexer.java:58)
	at org.netbeans.modules.maven.repository.RepositoryNode$RefreshIndexAction$1.run(RepositoryNode.java:241)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)

class org.netbeans.modules.maven.indexer.RemoteIndexTransferListener:

	public void transferStarted(TransferEvent arg0) {
         long contentLength = arg0.getResource().getContentLength();
         this.handle = ProgressHandleFactory.createHandle(NbBundle.getMessage(RemoteIndexTransferListener.class, "LBL_Transfer_TAG")//NII18N
                 + info.getName());
         handle.start((int) contentLength / 1024);
         if (debug) {
             writer.println("File Size :" + (int) contentLength / 1024);//NII18N
 
         }
     }

Error in string: "handle.start((int) contentLength / 1024);" - contentLength convert to int!!!

fixed in jet-main #77a7279dfbea

Integrated into 'main-silver', will be available in build *201505010001* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress)

Changeset: http://hg.netbeans.org/main-silver/rev/77a7279dfbea
User: Tomas Stupka <tstupka@netbeans.org>
Log: Issue #251987 - IllegalArgumentException: number of workunits cannot be negative

The bug is still there in NetBeans IDE 8.1 Beta (Build 201508041349)!

INFO [org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl]: could not (re-)index main java.io.EOFException: Unexpected end of ZLIB input stream

The downloaded index has a size of 2147483647 bytes (Integer.MAX_VALUE) when in fact the real archive is 2949372869 bytes!

Confirming Dr. cbourque issue with this fact:

maven.indexer depends on ext/indexer-core-5.1.1-patched.jar

which depends on maven-wagon 2.3

Tracing calls shows that we end up calling getTransfer( resource, stream, is, true, Integer.MAX_VALUE ).

I don't know about you, but that's bad.

I suggest overriding maven-wagon to a more recent version, i.e.: 2.9 which should be backward compatible!?

BTW, I just noticed it's maven-wagon 2.4 not 2.3 (must be the repack...).

> The bug is still there in NetBeans IDE 8.1 Beta (Build 201508041349)!
no, the originally reported problem in this issue was about wrong handling of long Resource.getContentLength() in the nb code base and was fixed.

filed #254873 to cover the getTransfer(..., Integer.MAX_VALUE) issue in the bundled http wagon 2.4

Cool thanks!