Importing from the ACM Digital Library hangs after selection

[khatchad]

• I have tested the latest master version from http://builds.jabref.org/master/ and the problem persists

JabRef version 4.1-dev--snapshot--2017-12-08--master--6f39151a7, Linux 4.13.0-17-generic amd64, Java 1.8.0_121 on Ubuntu 17.10

Steps to reproduce:

1. Search for a paper on the ACM Portal.
2. Select to import one the returned entries.

Expected result:
Entry appears in my bibliography.

Actual result:
JabRef hangs.

Log File

10:06:08.970 [JavaFX Application Thread] ERROR org.jabref.FallbackExceptionHandler - Uncaught exception occurred in Thread[JavaFX Application Thread,5,main]
java.lang.NullPointerException: null     
      at org.jabref.gui.search.GlobalSearchBar.lambda$new$5(GlobalSearchBar.java:196) ~[JabRef--master--latest.jar:?]
      at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295) ~[jfxrt.jar:?]
      at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_121]
      at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294) ~[jfxrt.jar:?]
      at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95) ~[jfxrt.jar:?]
      at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method) ~[jfxrt.jar:?]
      at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139) ~[jfxrt.jar:?]
      at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]                     
File: grouptree.fxml not found, attempting with camel case                         
File: grouptree.css not found, attempting with camel case                          
10:06:44.558 [JabRef CachedThreadPool] ERROR org.jabref.FallbackExceptionHandler - Uncaught exception occurred in Thread[JabRef CachedThreadPool,6,main]
java.lang.StringIndexOutOfBoundsException: String index out of range: -1           
      at java.lang.String.substring(String.java:1960) ~[?:1.8.0_121]             
      at org.jabref.gui.importer.fetcher.ACMPortalFetcher.downloadEntryBibTeX(ACMPortalFetcher.java:325) ~[JabRef--master--latest.jar:?]
      at org.jabref.gui.importer.fetcher.ACMPortalFetcher.getEntries(ACMPortalFetcher.java:181) ~[JabRef--master--latest.jar:?]
      at org.jabref.gui.importer.fetcher.GeneralFetcher.lambda$actionPerformed$2(GeneralFetcher.java:198) ~[JabRef--master--latest.jar:?]
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_121]
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_121]
      at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]

[Siedlerchr]

I can only reproduce the fetcher bug itself, seems like there has been an update to the acm page

[lenhard]

The outdated jdk version could be part of the problem. The latest development snapshot should display a warning that says that you need at least 1.8.0_144.