Full stack trace:

net.sourceforge.stripes.exception.StripesRuntimeException: Could not construct a MultipartWrapper for the current request.
	at net.sourceforge.stripes.controller.multipart.DefaultMultipartWrapperFactory.wrap(DefaultMultipartWrapperFactory.java:149)
	at net.sourceforge.stripes.controller.StripesRequestWrapper.constructMultipartWrapper(StripesRequestWrapper.java:120)
	at net.sourceforge.stripes.controller.StripesRequestWrapper.<init>(StripesRequestWrapper.java:105)
	at net.sourceforge.stripes.controller.StripesFilter.wrapRequest(StripesFilter.java:283)
	at net.sourceforge.stripes.controller.StripesFilter.doFilter(StripesFilter.java:232)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.remiss.microweb.auth.AuthenticationFilter.doFilter(AuthenticationFilter.java:132)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.remiss.microweb.framework.EncodingFilter.doFilter(EncodingFilter.java:60)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:767)
	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:697)
	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:889)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
	at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException
	at java.util.regex.Matcher.getTextLength(Matcher.java:1140)
	at java.util.regex.Matcher.reset(Matcher.java:291)
	at java.util.regex.Matcher.<init>(Matcher.java:211)
	at java.util.regex.Pattern.matcher(Pattern.java:888)
	at net.sourceforge.stripes.controller.multipart.CosMultipartWrapper.build(CosMultipartWrapper.java:76)
	at net.sourceforge.stripes.controller.multipart.DefaultMultipartWrapperFactory.wrap(DefaultMultipartWrapperFactory.java:143)
	... 25 more
java.lang.NullPointerException
	at java.util.regex.Matcher.getTextLength(Matcher.java:1140)
	at java.util.regex.Matcher.reset(Matcher.java:291)
	at java.util.regex.Matcher.<init>(Matcher.java:211)
	at java.util.regex.Pattern.matcher(Pattern.java:888)
	at net.sourceforge.stripes.controller.multipart.CosMultipartWrapper.build(CosMultipartWrapper.java:76)
	at net.sourceforge.stripes.controller.multipart.DefaultMultipartWrapperFactory.wrap(DefaultMultipartWrapperFactory.java:143)
	at net.sourceforge.stripes.controller.StripesRequestWrapper.constructMultipartWrapper(StripesRequestWrapper.java:120)
	at net.sourceforge.stripes.controller.StripesRequestWrapper.<init>(StripesRequestWrapper.java:105)
	at net.sourceforge.stripes.controller.StripesFilter.wrapRequest(StripesFilter.java:283)
	at net.sourceforge.stripes.controller.StripesFilter.doFilter(StripesFilter.java:232)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.remiss.microweb.auth.AuthenticationFilter.doFilter(AuthenticationFilter.java:132)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.remiss.microweb.framework.EncodingFilter.doFilter(EncodingFilter.java:60)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:767)
	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:697)
	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:889)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
	at java.lang.Thread.run(Thread.java:619)