NullPointerException when launching Blazegraph server

[csrull]

Hi,

I just installed Blazegraph 2.1.4 on my Mac (OSX 10.13.4) with JRE 10.0.1. When trying to launch the server with: java -server -Xmx800m -jar blazegraph.jar

I get the following error:

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

Extending the start server timeout via -Djetty.start.timeout=60 does not resolve the error. Any ideas how to resolve?

Thanks!

[thompsonbry]

I think that this thread has the answer.

https://sourceforge.net/p/bigdata/discussion/676946/thread/771a036f/

Bryan

On Sat, May 19, 2018 at 8:50 AM, csrull [email protected] wrote:

Hi,

I just installed Blazegraph 2.1.4 on my Mac (OSX 10.13.4) with JRE 10.0.1. When trying to launch the server with: java -server -Xmx800m -jar blazegraph.jar

I get the following error:

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

Extending the start server timeout via -Djetty.start.timeout=60 does not resolve the error. Any ideas how to resolve?

Thanks!

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[csrull]

First, thanks for the quick response.

But, I'm not a Java developer, so not sure how to modify the StandaloneNanoSparqlServer.java class and compile. Seems like the code should work out of the box when following the Start Blazegraph instructions on a Mac. Is there something else I can do to run it, short of installing Eclipse (etc), adding a line of code to a class, and recompiling?

[thompsonbry]

Basically, you need to set

-DjettyXml=....

Where .... is the path of your jetty.xml file.

This normally arises with embedded blazegraph use. I am not sure why you are having a problem launching the jar. See https://wiki.blazegraph.com/wiki/index.php/NanoSparqlServer for more information on using the NanoSparqlServer in various modes.

Bryan

On Sun, May 20, 2018 at 7:07 AM, csrull [email protected] wrote:

First, thanks for the quick response.

But, I'm not a Java developer, so not sure how to modify the StandaloneNanoSparqlServer.java class and compile. Seems like the code should work out of the box when following the Start Blazegraph instructions on a Mac. Is there something else I can do to run it, short of installing Eclipse (etc), adding a line of code to a class, and recompiling?

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[csrull]

Thanks. Tried that. I put a copy of jetty.xml in the same directory as blazegraph.jar, then executed:

export JETTY_XML=/absolute/path/to/jetty.xml
java -server -Xmx800m -DjettyXml=$JETTY_XML -jar blazegraph.jar

And got the exact same error.

[csrull]

Just following up -- I know this seems like a minor issue given the other bugs you are likely working on. I really want test this out over the weekend. Any other ideas or am I out of luck? Thanks!

[ehrhart]

Had the same issue with JRE 9.0.4. Fixed it by using JRE 8.0 instead.

export JAVA_HOME=$(/usr/libexec/java_home -v 1.8)
java -server -Xmx4g -jar blazegraph.jar

[thompsonbry]

Interesting...

On Mon, May 28, 2018, 05:31 Thibault Ehrhart [email protected] wrote:

Had the same issue with JRE 9.0.4. Fixed it by using JRE 8.0 instead.

export JAVA_HOME=$(/usr/libexec/java_home -v 1.8) java -server -Xmx4g -jar blazegraph.jar

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[colingoldberg]

I got the same error on my mac - macos Sierra 10.13.5

$ java -server -Xmx4g -jar blazegraph.jar INFO: com.bigdata.util.config.LogUtil: Configure: jar:file:/usr/local/share/blazegraph/blazegraph.jar!/log4j.properties

BlazeGraph(TM) Graph Engine

               Flexible
               Reliable
              Affordable
  Web-Scale Computing for the Enterprise

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

colins-mbp.home Fri Jul 06 16:10:49 EDT 2018 Mac OS X/10.13.5 x86_64 Mac OS X 10.13.5 x86_64 #CPU=4 Oracle Corporation 9.0.4 freeMemory=252868424 buildVersion=2.1.4 gitCommit=738d05f08cffd319233a4bfbb0ec2a858e260f9c

Dependency License
ICU http://source.icu-project.org/repos/icu/icu/trunk/license.html
bigdata-ganglia http://www.apache.org/licenses/LICENSE-2.0.html
blueprints-core https://github.com/tinkerpop/blueprints/blob/master/LICENSE.txt
colt http://acs.lbl.gov/software/colt/license.html
commons-codec http://www.apache.org/licenses/LICENSE-2.0.html
commons-fileupload http://www.apache.org/licenses/LICENSE-2.0.html
commons-io http://www.apache.org/licenses/LICENSE-2.0.html
commons-logging http://www.apache.org/licenses/LICENSE-2.0.html
dsiutils http://www.gnu.org/licenses/lgpl-2.1.html
fastutil http://www.apache.org/licenses/LICENSE-2.0.html
flot http://www.opensource.org/licenses/mit-license.php
high-scale-lib http://creativecommons.org/licenses/publicdomain
httpclient http://www.apache.org/licenses/LICENSE-2.0.html
httpclient-cache http://www.apache.org/licenses/LICENSE-2.0.html
httpcore http://www.apache.org/licenses/LICENSE-2.0.html
httpmime http://www.apache.org/licenses/LICENSE-2.0.html
jackson-core http://www.apache.org/licenses/LICENSE-2.0.html
jetty http://www.apache.org/licenses/LICENSE-2.0.html
jquery https://github.com/jquery/jquery/blob/master/MIT-LICENSE.txt
jsonld https://raw.githubusercontent.com/jsonld-java/jsonld-java/master/LICENCE log4j http://www.apache.org/licenses/LICENSE-2.0.html
lucene http://www.apache.org/licenses/LICENSE-2.0.html
nanohttp http://elonen.iki.fi/code/nanohttpd/#license
rexster-core https://github.com/tinkerpop/rexster/blob/master/LICENSE.txt
river http://www.apache.org/licenses/LICENSE-2.0.html
semargl https://github.com/levkhomich/semargl/blob/master/LICENSE
servlet-api http://www.apache.org/licenses/LICENSE-2.0.html
sesame http://www.openrdf.org/download.jsp
slf4j http://www.slf4j.org/license.html
zookeeper http://www.apache.org/licenses/LICENSE-2.0.html

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

JRE version: 10.0.1

I would expect that it would work out of the box. Anything I should configure beforehand?

Colin Goldberg

[thompsonbry]

Try java 8 per the thread.

On Fri, Jul 6, 2018, 13:22 Colin Goldberg [email protected] wrote:

I got the same error on my mac - macos Sierra 10.13.5

$ java -server -Xmx4g -jar blazegraph.jar INFO: com.bigdata.util.config.LogUtil: Configure: jar:file:/usr/local/share/blazegraph/blazegraph.jar!/log4j.properties

BlazeGraph(TM) Graph Engine

           Flexible
           Reliable
          Affordable

Web-Scale Computing for the Enterprise

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

colins-mbp.home Fri Jul 06 16:10:49 EDT 2018 Mac OS X/10.13.5 x86_64 Mac OS X 10.13.5 x86_64 #CPU=4 Oracle Corporation 9.0.4 freeMemory=252868424 buildVersion=2.1.4 gitCommit=738d05f08cffd319233a4bfbb0ec2a858e260f9c

Dependency License ICU http://source.icu-project.org/repos/icu/icu/trunk/license.html bigdata-ganglia http://www.apache.org/licenses/LICENSE-2.0.html blueprints-core https://github.com/tinkerpop/blueprints/blob/master/LICENSE.txt colt http://acs.lbl.gov/software/colt/license.html commons-codec http://www.apache.org/licenses/LICENSE-2.0.html commons-fileupload http://www.apache.org/licenses/LICENSE-2.0.html commons-io http://www.apache.org/licenses/LICENSE-2.0.html commons-logging http://www.apache.org/licenses/LICENSE-2.0.html dsiutils http://www.gnu.org/licenses/lgpl-2.1.html fastutil http://www.apache.org/licenses/LICENSE-2.0.html flot http://www.opensource.org/licenses/mit-license.php high-scale-lib http://creativecommons.org/licenses/publicdomain httpclient http://www.apache.org/licenses/LICENSE-2.0.html httpclient-cache http://www.apache.org/licenses/LICENSE-2.0.html httpcore http://www.apache.org/licenses/LICENSE-2.0.html httpmime http://www.apache.org/licenses/LICENSE-2.0.html jackson-core http://www.apache.org/licenses/LICENSE-2.0.html jetty http://www.apache.org/licenses/LICENSE-2.0.html jquery https://github.com/jquery/jquery/blob/master/MIT-LICENSE.txt jsonld https://raw.githubusercontent.com/jsonld-java/jsonld-java/master/LICENCE log4j http://www.apache.org/licenses/LICENSE-2.0.html lucene http://www.apache.org/licenses/LICENSE-2.0.html nanohttp http://elonen.iki.fi/code/nanohttpd/#license rexster-core https://github.com/tinkerpop/rexster/blob/master/LICENSE.txt river http://www.apache.org/licenses/LICENSE-2.0.html semargl https://github.com/levkhomich/semargl/blob/master/LICENSE servlet-api http://www.apache.org/licenses/LICENSE-2.0.html sesame http://www.openrdf.org/download.jsp slf4j http://www.slf4j.org/license.html zookeeper http://www.apache.org/licenses/LICENSE-2.0.html

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

JRE version: 10.0.1

I would expect that it would work out of the box. Anything I should configure beforehand?

Colin Goldberg

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[csrull]

I spent several hours trying to load JRE 8.0. Still never got it to work. Gave up and am using an alternative. Really wanted to use Blazegraph...

[mprinc]

Yes, same with me. Same problem. Same solution. Sadly, spent a lot of time before finding this issue thread

[bjonnh]

This issue is still present in the latest release (2.1.5) with Java 11.

[yongbozhang]

See same issue here. This is blocking my team upgrading to java 11.

[bjonnh]

You can run jetty by yourself. In kotlin I do:

fun main() {
    val blazePort = 9999
    val a = NanoSparqlServer()
    val server = Server(blazePort)
    val webapp = WebAppContext()
    val initParams = LinkedHashMap<String, String>()
    initParams[ConfigParams.NAMESPACE] = "xyz"
    initParams[ConfigParams.QUERY_THREAD_POOL_SIZE] = ConfigParams.DEFAULT_QUERY_THREAD_POOL_SIZE.toString()
    initParams[ConfigParams.FORCE_OVERFLOW] = "false"
    initParams[ConfigParams.READ_LOCK] = "0"
    webapp.setAttribute("INIT_PARAMS_OVERRIDES", initParams)
    webapp.contextPath = "/blazegraph"
    webapp.war = a.javaClass.getResource("/war").toExternalForm()
    webapp.isExtractWAR = true
    server.handler = webapp
    server.start()
    server.join()
}

[thompsonbry]

Did you try the fix suggested in this thread? See [1,2].

If this is not your problem, can you please include the stack trace and provide a link to the line in the code where the exception is thrown?

Thanks, Bryan

[1] https://sourceforge.net/p/bigdata/discussion/676946/thread/771a036f/ [2] https://sourceforge.net/p/bigdata/discussion/676946/thread/cbc36a99/?limit=25#dfb4

On Mon, May 6, 2019 at 11:18 bjonnh [email protected] wrote:

You can run jetty by yourself. In kotlin I do:

fun main() { val blazePort = 9999 val a = NanoSparqlServer() val server = Server(blazePort) val webapp = WebAppContext() val initParams = LinkedHashMap<String, String>() initParams[ConfigParams.NAMESPACE] = "napralert" initParams[ConfigParams.QUERY_THREAD_POOL_SIZE] = ConfigParams.DEFAULT_QUERY_THREAD_POOL_SIZE.toString() initParams[ConfigParams.FORCE_OVERFLOW] = "false" initParams[ConfigParams.READ_LOCK] = "0" webapp.setAttribute("INIT_PARAMS_OVERRIDES", initParams) webapp.contextPath = "/blazegraph" webapp.war = a.javaClass.getResource("/war").toExternalForm() webapp.isExtractWAR = true server.handler = webapp server.start() server.join() }

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[Aref-cs]

-DjettyXml= (address)

May I ask where should the this code be entered to?

Thanks Aref

[thompsonbry]

Right before -server in your command. It is an argument to the JVM

On Thu, Jun 27, 2019 at 15:00 Aref-cs [email protected] wrote:

-DjettyXml= (address)

May I ask where should the this code be entered to?

Thanks

Aref

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[Aref-cs]

Right before -server in your command. It is an argument to the JVM … On Thu, Jun 27, 2019 at 15:00 Aref-cs @.***> wrote: -DjettyXml= (address) May I ask where should the this code be entered to? Thanks Aref — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#89?email_source=notifications&email_token=AATW7YB2S5YABFZ5GYX2PHLP4S2XJA5CNFSM4FAXAUY2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODYXBD7Y#issuecomment-506335743>, or mute the thread https://github.com/notifications/unsubscribe-auth/AATW7YHAP7WXMBPKKOSCERTP4S2XJANCNFSM4FAXAUYQ .

Thanks a lot Bryan! :)

The path to jetty.xml is /etc/blazegraph, am I correct? I used this command: java -DjettyXml=/etc/blazegraph -server -Xmx4g -jar blazegraph.jar However, it was not successful!

Also, I've seen the code below in one of the links you provided. Where can I find the StandaloneNanoSparqlServer.Java and where in the file should I paste this code?

String jettyXml = System.getProperty(SystemProperties.JETTY_XML, "jetty.xml");
System.setProperty("jetty.home", jettyXml.getClass().getResource("/war").toExternalForm());

Thanks in Advance, Aref

[bastiotutuama]

Setup with/Specific Downgrade to Java 8 JDK and JRE worked for me to get it running (on Ubuntu 18.04).

Installing Java 8 JRE & JDK sudo apt install openjdk-8-jre-headless sudo apt install openjdk-8-jdk

If needed: Uninstalling Java Installation: sudo apt-get remove --purge icedtea-* openjdk-*

[beebs-systap]

Please try the jar version included in the 2.1.6 RC. It works with Java 9+.

https://github.com/blazegraph/database/releases/tag/BLAZEGRAPH_2_1_6_RC

[Dadou1985]

First, you should uninstall your java sdk version and set up the java sdk version 8: $ sudo apt install openjdk-8-jdk Then install Blazegraph and run it: $ curl -L -o blazegraph.jar https://github.com/blazegraph/database/releases/download/BLAZEGRAPH_RELEASE_CANDIDATE_2_1_5/blazegraph.jar java -jar blazegraph.jar

It works for me and I'm working on ubuntu.

[Dadou1985]

I forgot the dollar before "java -jar blazegraph.jar" to run it. good luck !