NoClassFound in Netbeans 7.3.2 with class existing; similarly-named class broken

NoClassFound in Netbeans 7.3.2 with class existing; similarly-named class
broken

My Netbeans project uses BatchFb and thus Jackson. I've included the jars
for jackson-mapper-asl and jackson-core-asl.
Unfortunately, I'm not able to run it as I get a ClassNotFound exception
when I try to initialize an instance of FacebookBatcher. It can't find the
VisibilityChecker class even though I see it in the explorer window.
Here's the full stack trace I get:
ago 11, 2013 12:46:55 PM org.apache.catalina.core.StandardWrapperValve
invoke SEVERE: Servlet.service() for servlet [FacebookServlet] in context
with path [/Tesi] threw exception [Servlet execution threw an exception]
with root cause java.lang.ClassNotFoundException:
org.codehaus.jackson.map.introspect.VisibilityChecker at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
at FacebookServlet.doGet(FacebookServlet.java:38) at
javax.servlet.http.HttpServlet.service(HttpServlet.java:621) at
javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
I've tried al possible steps: I manually removed the jars from the
web-inf/lib folder and put them there again, created a new project from
scratch,cleant and build n times, even deleting the netbeans cache didn't
help, none of this worked for me.
I inspected the compiled files in the jars and I noticed there's a class
named VisibilityChecker$1.class in addiction to the regular
VisibilityChecker.class. I can't open it as there's no source code. I
think that this might be the cause, but what can I do now? Thanks in
advance.