Blazegraph

Exception for remote connections

Problem: running a remote query throws an error:

java.io.IOException: Could not identify format for service response: serviceURI=http://localhost:9999/bigdata/sparql,
contentType=application/rdf+xml : response=<?xml version="1.0" encoding="UTF-8"?>

Solution: change the serviceURI from .../bigdata to .../blazegraph. (source)

Turning off the banner

By default, Blazegraph starts with a large wall of text:

BlazeGraph(TM) Graph Engine

                   Flexible
                   Reliable
                  Affordable
      Web-Scale Computing for the Enterprise

Copyright SYSTAP, LLC DBA Blazegraph 2006-2016.  All rights reserved.

[...]

To turn off the banner, using the blazegraph.properties file is not sufficient. Instead, you have to either provide a VM argument (-Dcom.bigdata.Banner.quiet=true) or set it manually from code before instantiating Blazegraph's classes:

System.getProperties().setProperty("com.bigdata.Banner.quiet", "true");

This way, the banner is not displayed, but there is still another log message:

INFO: com.bigdata.util.config.LogUtil: Configure: file:/.../log4j.properties

To turn this off, set the LogUtil to quiet with another VM argument (-Dcom.bigdata.util.config.LogUtil.quiet=true) or from code:

System.getProperties().setProperty("com.bigdata.util.config.LogUtil.quiet", "true");