Description of problem: I am running Sage math on a user that has no X session active. I am now connected from a remote machine. If I enter commands like: H4=graphs.CubeGraph(4) H4.plot3d() I get the error messages: Exception in thread "main" java.lang.ExceptionInInitializerError Caused by: java.awt.HeadlessException: No X11 DISPLAY variable was set, but this program performed an operation which requires it. at sun.awt.HeadlessToolkit.getScreenSize(HeadlessToolkit.java:282) at org.openscience.jmol.app.jmolpanel.JmolPanel.<clinit>(Unknown Source) Sleeping... if no image appears re-execute the cell. 3-D viewer has been updated Version-Release number of selected component (if applicable): sagemath-5.9-9.fc19.x86_64
Using the command H4=graphs.CubeGraph(4) j=H4.plot3d() j.show(viewer='tachyon') Sagemath correctly shows the graph. H4=graphs.CubeGraph(4) j=H4.plot3d() j.show(viewer='java3d') works too. Using j.show(viewer='jmol') gives error messages like in comment #1, so I think jmol is be the default viewer, that gives troubles.
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*** Bug 1381886 has been marked as a duplicate of this bug. ***
Sorry for the long delay responding this bug report. I am about to update rawhide at first for sagemath-7.4. There was an issue with newer sagemath where it would not load jmol because it would search in $SAGE_LOCAL/bin/jmol instead of jmol in $PATH. I am adding a small patch to cover the test case in your bug report, and make it work for the newer sagemath package.
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