java.lang.NullPointerException
	at java.base/java.util.Objects.requireNonNull(Objects.java:222)
	at net.sourceforge.plantuml.posimo.Path.<init>(Path.java:60)
	at net.sourceforge.plantuml.dot.CucaDiagramTxtMaker.<init>(CucaDiagramTxtMaker.java:118)
	at net.atmp.CucaDiagram.createFilesTxt(CucaDiagram.java:373)
	at net.atmp.CucaDiagram.exportDiagramInternal(CucaDiagram.java:397)
	at net.sourceforge.plantuml.UmlDiagram.exportDiagramNow(UmlDiagram.java:138)
	at net.sourceforge.plantuml.AbstractPSystem.exportDiagram(AbstractPSystem.java:207)
	at net.sourceforge.plantuml.servlet.DiagramResponse.sendDiagram(DiagramResponse.java:160)
	at net.sourceforge.plantuml.servlet.UmlDiagramService.doGet(UmlDiagramService.java:94)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:717)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1644)
	at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:164)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1615)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:550)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:568)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1110)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:479)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1044)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:199)
	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
	at org.eclipse.jetty.server.Server.handle(Server.java:459)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:281)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:232)
	at org.eclipse.jetty.io.AbstractConnection$1.run(AbstractConnection.java:505)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:607)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:536)
	at java.base/java.lang.Thread.run(Thread.java:832)