JSoup Initialisation NPE

Chris101 · March 8, 2013, 9:54am

Hi guys,

I’m trying to rollout a Vaadin 7 application and am getting the same error on startup over and over. It started off being intermittant and stopping and starting the server a couple of times resolved the issue; but now it’s happening every time

java.lang.NoClassDefFoundError: Could not initialize class org.jsoup.nodes.Entities$EscapeMode
	at org.jsoup.nodes.Document$OutputSettings.<init>(Document.java:208)
	at org.jsoup.nodes.Document.<init>(Document.java:17)
	at org.jsoup.parser.TreeBuilder.initialiseParse(TreeBuilder.java:27)
	at org.jsoup.parser.HtmlTreeBuilder.parseFragment(HtmlTreeBuilder.java:43)
	at org.jsoup.parser.Parser.parseFragment(Parser.java:105)
	at org.jsoup.nodes.Element.append(Element.java:343)
	at com.vaadin.server.BootstrapHandler.setupMainDiv(BootstrapHandler.java:330)
	at com.vaadin.server.BootstrapHandler.handleRequest(BootstrapHandler.java:146)
	at com.vaadin.server.AbstractCommunicationManager.handleOtherRequest(AbstractCommunicationManager.java:2334)
	at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:330)
	at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:201)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:598)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1367)
	at waffle.servlet.NegotiateSecurityFilter.doFilterPrincipal(Unknown Source)
	at waffle.servlet.NegotiateSecurityFilter.doFilter(Unknown Source)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1338)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:484)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1065)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:413)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:999)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111)
	at org.eclipse.jetty.server.Server.handle(Server.java:350)
	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:454)
	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:890)
	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:944)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:630)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:230)
	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:77)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:606)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:46)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:603)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:538)
	at java.lang.Thread.run(Thread.java:722)

2013-03-08 09:23:12.307:WARN:oejs.ServletHandler:/tradestore/
java.lang.NoClassDefFoundError: Could not initialize class org.jsoup.nodes.Entities$EscapeMode
	at org.jsoup.nodes.Document$OutputSettings.<init>(Document.java:208)
	at org.jsoup.nodes.Document.<init>(Document.java:17)
	at org.jsoup.parser.TreeBuilder.initialiseParse(TreeBuilder.java:27)
	at org.jsoup.parser.HtmlTreeBuilder.parseFragment(HtmlTreeBuilder.java:43)
	at org.jsoup.parser.Parser.parseFragment(Parser.java:105)
	at org.jsoup.nodes.Element.append(Element.java:343)
	at com.vaadin.server.BootstrapHandler.setupMainDiv(BootstrapHandler.java:330)
	at com.vaadin.server.BootstrapHandler.handleRequest(BootstrapHandler.java:146)
	at com.vaadin.server.AbstractCommunicationManager.handleOtherRequest(AbstractCommunicationManager.java:2334)
	at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:330)
	at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:201)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:598)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1367)
	at waffle.servlet.NegotiateSecurityFilter.doFilterPrincipal(Unknown Source)
	at waffle.servlet.NegotiateSecurityFilter.doFilter(Unknown Source)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1338)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:484)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1065)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:413)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:999)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111)
	at org.eclipse.jetty.server.Server.handle(Server.java:350)
	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:454)
	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:890)
	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:944)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:630)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:230)
	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:77)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:606)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:46)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:603)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:538)
	at java.lang.Thread.run(Thread.java:722)

Don’t suppose anyone’s run into this problem before/can provide some help?

Thanks in advance.

Tobias17 · March 8, 2013, 10:25am

Looks like jSoup is not in the classpath.

Chris101 · March 8, 2013, 11:32am

It does look like that, but JSoup is definitely on the classpath…

In fact, the stack trace I posted is actually the second time the application is accessed, the first time the exception starts with…

java.lang.ExceptionInInitializerError
	at org.jsoup.nodes.Entities$EscapeMode.<clinit>(Entities.java:18)

The reason looks to be that JSoup is statically reading in a resource using the classloader, and not finding it, giving back null, which is then passed to the Properties.load(), giving a NPE. As the class can’t be loaded the second time you access it you get a NoClassDefFound error.

So the problem then becomes, why can Jetty not find the properties file…

JSoup is loading using

            InputStream in = Entities.class.getResourceAsStream(filename);
            properties.load(in);

where the filename is “entities-base.properties”.

I’m now totally out of my depth, all I know is that Jetty’s classloader for servlets has a slightly different resolution pattern.