IDE fails to load

Processing
1

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>(GraphicsPrimitiveMgr.java:56)
	at sun.java2d.loops.Blit.<clinit>(Blit.java:114)
	at sun.java2d.x11.X11SurfaceData.<clinit>(X11SurfaceData.java:245)
	at sun.awt.X11GraphicsConfig.<clinit>(X11GraphicsConfig.java:80)
	at sun.awt.X11GraphicsDevice.makeDefaultConfiguration(X11GraphicsDevice.java:266)
	at sun.awt.X11GraphicsDevice.getDefaultConfiguration(X11GraphicsDevice.java:227)
	at sun.awt.X11.XToolkit.<clinit>(XToolkit.java:128)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at java.awt.Toolkit$2.run(Toolkit.java:860)
	at java.awt.Toolkit$2.run(Toolkit.java:855)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:854)
	at java.awt.SystemColor.updateSystemColors(SystemColor.java:473)
	at java.awt.SystemColor.<clinit>(SystemColor.java:465)
	at processing.app.Preferences.init(Preferences.java:102)
	at processing.mode.java.Commander.<init>(Commander.java:233)
	at processing.mode.java.Commander.main(Commander.java:86)

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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