NullPointerException when launching Blazegraph server #89

csrull · 2018-05-19T15:49:59Z

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!

The text was updated successfully, but these errors were encountered:

thompsonbry · 2018-05-19T20:30:51Z

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 ***@***.***> 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! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#89>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACdv4OdGJvZ6G0UnJTVsFRy6gIHq-pJdks5t0D8ogaJpZM4UFwUx> .

csrull · 2018-05-20T14:07:17Z

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 · 2018-05-20T14:52:44Z

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 ***@***.***> 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? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#89 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACdv4E2t3C3S22T9o_m4aY0rYz9XQBHxks5t0XiXgaJpZM4UFwUx> .

csrull · 2018-05-20T18:54:27Z

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 · 2018-05-25T01:50:57Z

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 · 2018-05-28T12:31:48Z

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 · 2018-05-28T14:49:21Z

Interesting...

…

On Mon, May 28, 2018, 05:31 Thibault Ehrhart ***@***.***> 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 — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#89 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACdv4EvHjLYQ9JEqVWoh1rirYDFisGqPks5t2-41gaJpZM4UFwUx> .

colingoldberg · 2018-07-06T20:22:47Z

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

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

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 · 2018-07-06T21:13:40Z

Try java 8 per the thread.

…

csrull · 2018-07-06T23:00:59Z

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 · 2018-10-23T04:20:32Z

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

bjonnh · 2019-05-02T17:10:01Z

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

yongbozhang · 2019-05-06T18:11:55Z

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

bjonnh · 2019-05-06T18:18:10Z

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 · 2019-05-06T19:46:04Z

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 ***@***.***> 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() } — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#89 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AATW7YAIRCWB4AH6GBEDDUDPUBY6JANCNFSM4FAXAUYQ> .

Aref-cs · 2019-06-27T13:00:35Z

-DjettyXml= (address)

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

Thanks
Aref

thompsonbry · 2019-06-27T13:05:20Z

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> .

Aref-cs · 2019-06-27T13:27:40Z

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 · 2019-10-22T16:04:55Z

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 · 2020-02-01T01:00:25Z

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 · 2020-11-18T11:03:20Z

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 · 2020-11-18T11:04:53Z

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

tyriis mentioned this issue Dec 17, 2019

blazegraph does not work with java 11 WoN-Hackathon-2019/Information#3

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NullPointerException when launching Blazegraph server #89

NullPointerException when launching Blazegraph server #89

csrull commented May 19, 2018

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csrull commented May 20, 2018

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csrull commented May 20, 2018

csrull commented May 25, 2018

ehrhart commented May 28, 2018

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NullPointerException when launching Blazegraph server #89

NullPointerException when launching Blazegraph server #89

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csrull commented May 19, 2018

thompsonbry commented May 19, 2018 via email

csrull commented May 20, 2018

thompsonbry commented May 20, 2018 via email

csrull commented May 20, 2018

csrull commented May 25, 2018

ehrhart commented May 28, 2018

thompsonbry commented May 28, 2018 via email

colingoldberg commented Jul 6, 2018

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