IDE fails to load

I have been using Processing 3 for several years (RPi 3B). Lately I cannot start the IDE. Clicking on the desktop the splash screen flashes, disapperars, and nothing more. When I invoke it from a C program I get errors as follows:

Exception in thread "main" java.lang.ClassFormatError: Unknown constant tag 111 in class file sun/java2d/SunGraphics2D
	at sun.java2d.loops.GraphicsPrimitiveMgr.<clinit>(
	at sun.java2d.loops.Blit.<clinit>(
	at sun.java2d.x11.X11SurfaceData.<clinit>(
	at sun.awt.X11GraphicsConfig.<clinit>(
	at sun.awt.X11GraphicsDevice.makeDefaultConfiguration(
	at sun.awt.X11GraphicsDevice.getDefaultConfiguration(
	at sun.awt.X11.XToolkit.<clinit>(
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(
	at java.awt.Toolkit$
	at java.awt.Toolkit$
	at Method)
	at java.awt.Toolkit.getDefaultToolkit(
	at java.awt.SystemColor.updateSystemColors(
	at java.awt.SystemColor.<clinit>(

Other than to try to re-install Processing, does anyone have a suggestion to get this running?

By the way, I can start and run successfully Processing sketches which have been compiled/exported, so I think this is just an IDE issue.

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