Rrd4j Charts error

Add-ons Persistence Services
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1

Hello. I use OH1.8.2 on Synology DSM6. The project I have moved from Raspi (Jessy) where it works perfect (except that tah Raspi kill the SD-card every 3 month).
On Synology I have now the problem, that the charts not works. I get the following error:

HTTP ERROR 500

Problem accessing /rrdchart.png. Reason:

Could not initialize class org.rrd4j.graph.RrdGraphConstants

Caused by:

java.lang.NoClassDefFoundError: Could not initialize class org.rrd4j.graph.RrdGraphConstants
at org.rrd4j.graph.RrdGraphDef.(Unknown Source)
at org.openhab.persistence.rrd4j.internal.charts.RRD4jChartServlet.createChart(RRD4jChartServlet.java:254)
at org.openhab.persistence.rrd4j.internal.charts.RRD4jChartServlet.service(RRD4jChartServlet.java:160)
at org.eclipse.equinox.http.servlet.internal.ServletRegistration.service(ServletRegistration.java:61)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:128)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:60)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:598)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:486)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1065)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:413)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:999)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:250)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111)
at org.eclipse.jetty.server.Server.handle(Server.java:350)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:454)
at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:890)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:944)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:630)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:230)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:77)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:606)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:46)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:603)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:538)
at java.lang.Thread.run(Thread.java:745)

Has anyone any suggestion?

2

I have the same problem. Did you solve it?

3

Hi. Sorry for the late replay. No, I canceled the project with synology. I bought a PC-Bord from PC-Engines with a 64gb SSD. I use the synology only to store the database from persistance.

4

Hi treesink,

I have the same issue. Where you able to solve this somehow.
Moving to a different hardware is no option for my case.

5

I haven’t tried this on my NAS, but could this article be relevant?

6

Hmm, it sounds reasonable that a synology has no real UI support and therefore that might be the cause.
But doing now a lot of research in the internet it seems like for some diskstations charting works and for some not.
I was now trying to understand the linked discussion, but I have no idea how I could change the behavior of the chart generation so that it supports headless devices.

7

So -Djava.awt.headless=true (iirc) is passed to the Java runtime?

8

But the how should this be done?
I am calling the chart via URL for testing purpose like this:

http://<IP>:8080/rrdchart.png?items=my_item&period=h

Then I get the same error like @aco described.

9

@watou
I have done some more research on this topic and found that there was already once a discussion on something similar by Kai:
Click me

I have double checked this and the headless parameter is set on my system.
Any other suggestions?

Michael

10

Same problem on 2 install on 2 differents syno, well working since 2 years with java7, since I tried to install openhab2, and/or java8.

11

I’ve upgraded my OH to 2.2 on my syno and my charts no longer work. i have no solution, just letting you know someone else out there is having the same issue

12

fixed it.
green arrow type java. red arrow click open

java
java.png792×359 35.1 KB

java2
java2.png1187×785 95 KB

follow the instructions. download the file. uploaded it to syno. stop openhab. start openhab. enjoy charts

1 Like
13

Thank you Scott. This worked for me on my DS1513+ too.

1 Like