Question: I just created a smal sitemap for BasicUI, that shows if the heating in my daugthers terrarium is in and which temperature and humidity is there. Next step would be to create a smal chart that shows the humidity over the day.
With the sitemap builder this should be easy, i did not work.
The values are resistet, what i can see from the analyse feature which is connected to my influxDB.
In the sitemap builder things are looking like that.
Unfortunately i did find no version3 documentation on sitemaps 
The code checker said:
But the is no sitemapy displayed. if i remove the chart the sitemapy works fine. Maybe a disable option for entries would be nice, so we did not need to delete the entry for testing. Not everyone like to use the text editor.
The i looked into the OH3 log and found the following.
2020-12-26 12:12:51.936 [ERROR] [omponents.UIComponentSitemapProvider] - Cannot build sitemap Neele
java.lang.ClassCastException: class java.math.BigDecimal cannot be cast to class java.lang.Integer (java.math.BigDecimal and java.lang.Integer are in module java.base of loader 'bootstrap')
at org.openhab.core.model.sitemap.sitemap.impl.ChartImpl.eSet(ChartImpl.java:270) ~[bundleFile:?]
at org.openhab.core.ui.internal.components.UIComponentSitemapProvider.setWidgetPropertyFromComponentConfig(UIComponentSitemapProvider.java:286) ~[bundleFile:?]
at org.openhab.core.ui.internal.components.UIComponentSitemapProvider.buildWidget(UIComponentSitemapProvider.java:188) ~[bundleFile:?]
at org.openhab.core.ui.internal.components.UIComponentSitemapProvider.buildWidget(UIComponentSitemapProvider.java:262) ~[bundleFile:?]
at org.openhab.core.ui.internal.components.UIComponentSitemapProvider.buildSitemap(UIComponentSitemapProvider.java:146) ~[bundleFile:?]
at org.openhab.core.ui.internal.components.UIComponentSitemapProvider.getSitemapNames(UIComponentSitemapProvider.java:105) [bundleFile:?]
at org.openhab.ui.basic.internal.render.PageRenderer.renderSitemapList(PageRenderer.java:218) [bundleFile:?]
at org.openhab.ui.basic.internal.servlet.WebAppServlet.showSitemapList(WebAppServlet.java:135) [bundleFile:?]
at org.openhab.ui.basic.internal.servlet.WebAppServlet.service(WebAppServlet.java:167) [bundleFile:?]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [bundleFile:3.1.0]
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:852) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:544) [bundleFile:9.4.20.v20190813]
at org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:71) [bundleFile:?]
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:536) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1581) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1307) [bundleFile:9.4.20.v20190813]
at org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:293) [bundleFile:?]
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:482) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1549) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1204) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) [bundleFile:9.4.20.v20190813]
at org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:80) [bundleFile:?]
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.server.Server.handle(Server.java:494) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:374) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:268) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:367) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:782) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:918) [bundleFile:9.4.20.v20190813]
at java.lang.Thread.run(Thread.java:834) [?:?]
The only Integer/Bigdecimal i see is the refresh interval and if i remove it the sitemap is working well again.
Does anyone has the same problem oder is able to reproduce it?