Internal error: please report

java.lang.NoClassDefFoundError: Could not initialize class sun.java2d.Disposer
	at javax.imageio.stream.FileCacheImageInputStream.(FileCacheImageInputStream.java:110)
	at com.sun.imageio.spi.InputStreamImageInputStreamSpi.createInputStreamInstance(InputStreamImageInputStreamSpi.java:69)
	at javax.imageio.ImageIO.createImageInputStream(ImageIO.java:347)
	at javax.imageio.ImageIO.read(ImageIO.java:1341)
	at net.pterodactylus.sone.web.UploadImagePage.processTemplate(UploadImagePage.java:118)
	at net.pterodactylus.sone.web.page.FreenetTemplatePage.handleRequest(FreenetTemplatePage.java:157)
	at net.pterodactylus.sone.web.page.FreenetTemplatePage.handleRequest(FreenetTemplatePage.java:51)
	at net.pterodactylus.sone.web.page.PageToadlet.handleRequest(PageToadlet.java:150)
	at net.pterodactylus.sone.web.page.PageToadlet.handleMethodPOST(PageToadlet.java:124)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:616)
	at freenet.clients.http.ToadletContextImpl.callToadletMethod(ToadletContextImpl.java:681)
	at freenet.clients.http.ToadletContextImpl.handle(ToadletContextImpl.java:594)
	at freenet.clients.http.SimpleToadletServer$SocketHandler.run(SimpleToadletServer.java:1032)
	at freenet.support.PooledExecutor$MyThread.innerRun(PooledExecutor.java:247)
	at freenet.support.PooledExecutor$MyThread.realRun(PooledExecutor.java:187)
	at freenet.support.io.NativeThread.run(NativeThread.java:129)