Blazegraph error when running on Windows 10

Question

Failed to run Blazegraph (Java RDF triple store) on Windows 10 using the simple steps from the download page.

I have a windows 10 machine with Java JDK 9 installed (See version check below). I downloaded the latest Blazegraph executable jar and then ran "java -server -Xmx4g -jar blazegraph.jar". It reports a NullPointerException as shown below. If it is helpful the error below references StandaloneNanoSparqlServer.java:142, which github shows to be "System.setProperty("jetty.home", jettyXml.getClass().getResource("/war").toExternalForm());".

Commands/Response at Windows admin CMD prompt:

C:\Users\aidesigner\Downloads\Blazegraph>dir
11/26/2017 09:48 PM 56,702,395 blazegraph.jar
11/26/2017 09:06 PM 0 rules.log

C:\Users\aidesigner\Downloads\Blazegraph>java -version
java version "9"
Java(TM) SE Runtime Environment (build 9+181)
Java HotSpot(TM) 64-Bit Server VM (build 9+181, mixed mode)

C:\Users\aidesigner\Downloads\Blazegraph>java -server -Xmx4g -jar blazegraph.jar
INFO: com.bigdata.util.config.LogUtil: Configure: jar:file:/C:/Users/aidesigner/Downloads/Blazegraph/blazegraph.jar!/log4j.properties
WARN : SystemUtil.java:71: No CPUParser for this platform - looking for class: [org.apache.system.Windows10]

BlazeGraph(TM) Graph Engine

Flexible
Reliable
Affordable
Web-Scale Computing for the Enterprise
Copyright SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
developer-pc.home
Sun Nov 26 21:08:03 CST 2017
Windows 10/10.0 amd64
amd64 Family n, Model n, Stepping n, Undeterminable #CPU=1
Oracle Corporation 9
freeMemory=521142272
buildVersion=2.1.1
gitCommit=90d9e8232969a8afdc830e856643e5416bb50d0a

// <Displays about 20 license links>

ERROR: Banner.java:160: Uncaught exception in thread
java.lang.NullPointerException
at com.bigdata.rdf.sail.webapp.StandaloneNanoSparqlServer.main(StandaloneNanoSparqlServer.java:142)

Answer 1

It is probably a jre compatibility issue. I had the same problem with jre 9, switching back to jre 7 solved the NPE.