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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$1.next(ServiceLoader.java:480)	at javax.imageio.spi.IIORegistry.registerApplicationClasspathSpis(IIORegistry.java:210)	at javax.imageio.spi.IIORegistry.(IIORegistry.java:138)	at javax.imageio.spi.IIORegistry.getDefaultInstance(IIORegistry.java:159)	at javax.imageio.ImageIO.(ImageIO.java:66)	at com.comp.core.model.artifactThumbnails.ArtifactThumbnailRepository.generateThumbnail(ArtifactThumbnailRepository.java:63)	at com.comp.core.model.artifactThumbnails.BigTableArtifactThumbnailRepository.createThumbnail(BigTableArtifactThumbnailRepository.java:71)	at com.comp.web.routes.vertex.VertexThumbnail.handle(VertexThumbnail.java:90)	at com.comp.miniweb.HandlerChain.next(HandlerChain.java:18)	at com.comp.web.privilegeFilters.PrivilegeFilter.handle(PrivilegeFilter.java:35)	at com.comp.miniweb.HandlerChain.next(HandlerChain.java:18)	at com.comp.miniweb.handlers.CSRFHandler.handle(CSRFHandler.java:66)	at com.comp.miniweb.HandlerChain.next(HandlerChain.java:18)	at com.comp.web.AuthenticationHandler.handle(AuthenticationHandler.java:17)	at com.comp.miniweb.HandlerChain.next(HandlerChain.java:18)	at com.comp.miniweb.Router.dispatch(Router.java:93)	at com.comp.miniweb.Router.routeWithExceptionHandling(Router.java:87)	at com.comp.miniweb.Router.route(Router.java:44)	at com.comp.miniweb.App.handle(App.java:128)	at com.comp.web.WebApp.handle(WebApp.java:71)	at com.comp.web.Router.service(Router.java:186)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:800)	at org.eclipse.jetty.servlet.ServletHandler$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)