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java.lang.SecurityException: sealing violation: package com.sun.media.imageioimpl.plugins.jpeg is sealed at java.net.URLClassLoader.getAndVerifyPackage(URLClassLoader.java:399) at java.net.URLClassLoader.definePackageInternal(URLClassLoader.java:419) at java.net.URLClassLoader.defineClass(URLClassLoader.java:451) at java.net.URLClassLoader.access$100(URLClassLoader.java:73) at java.net.URLClassLoader$1.run(URLClassLoader.java:368) at java.net.URLClassLoader$1.run(URLClassLoader.java:362) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:361) at org.eclipse.jetty.webapp.WebAppClassLoader.findClass(WebAppClassLoader.java:510) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:441) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:403) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:348) at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:370) at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:404) at java.util.ServiceLoader$1.next(ServiceLoader.java:480) at javax.imageio.spi.IIORegistry.registerApplicationClasspathSpis(IIORegistry.java:210) at javax.imageio.spi.IIORegistry.<init>(IIORegistry.java:138) at javax.imageio.spi.IIORegistry.getDefaultInstance(IIORegistry.java:159) at javax.imageio.ImageIO.<clinit>(ImageIO.java:66) at com.comp.core.model.artifactThumbnails.ArtifactThumbnailRepository.generateThumbnail(ArtifactThumbnailRepository.java:63) at com.comp.core.model.artifactThumbnails.BigTableArtifactThumbnailRepository.createThumbnail(BigTableArtifactThumbnailRepository.java:71) at com.comp.web.routes.vertex.VertexThumbnail.handle(VertexThumbnail.java:90) at com.comp.miniweb.HandlerChain.next(HandlerChain.java:18) at com.comp.web.privilegeFilters.PrivilegeFilter.handle(PrivilegeFilter.java:35) at com.comp.miniweb.HandlerChain.next(HandlerChain.java:18) at com.comp.miniweb.handlers.CSRFHandler.handle(CSRFHandler.java:66) at com.comp.miniweb.HandlerChain.next(HandlerChain.java:18) at com.comp.web.AuthenticationHandler.handle(AuthenticationHandler.java:17) at com.comp.miniweb.HandlerChain.next(HandlerChain.java:18) at com.comp.miniweb.Router.dispatch(Router.java:93) at com.comp.miniweb.Router.routeWithExceptionHandling(Router.java:87) at com.comp.miniweb.Router.route(Router.java:44) at com.comp.miniweb.App.handle(App.java:128) at com.comp.web.WebApp.handle(WebApp.java:71) at com.comp.web.Router.service(Router.java:186) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:800) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669) at com.comp.web.RequestDebugFilter.doFilter(RequestDebugFilter.java:33) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652) at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:224) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) at org.eclipse.jetty.server.Server.handle(Server.java:497) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:245) at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555) at java.lang.Thread.run(Thread.java:745)