CSV importer does not work on JBoss 4

A user reports that the new CSV importer does not work on JBoss4, as JBoss's built-in commons-collections.jar is incompatible with JIRA's:

005-04-22 09:21:01,520 DEBUG [com.atlassian.jira.imports.csv.CsvMapper] Headers read. Fields: 4
2005-04-22 09:21:01,520 DEBUG [com.atlassian.jira.imports.csv.MindProdCsvProvider] o.getClass(): class java.util.ArrayList
2005-04-22 09:21:01,520 DEBUG [com.atlassian.jira.imports.csv.MindProdCsvProvider] o.getClass(): class java.util.ArrayList
2005-04-22 09:21:01,521 DEBUG [webwork.action.ActionSupport] Action execution done, returned null
2005-04-22 09:21:01,521 DEBUG [webwork.action.ActionSupport] Action executed in 3 ms
2005-04-22 09:21:01,521 ERROR [webwork.dispatcher.ServletDispatcher] Could not execute action
java.lang.NoSuchMethodError: com.atlassian.jira.external.beans.SetMultiHashMap.putAll(Ljava/lang/Object;Ljava/util/Collection;)Z
at com.atlassian.jira.imports.csv.CsvConfigBean.populateUniqueCsvFieldValues(CsvConfigBean.java:481)
at com.atlassian.jira.web.action.util.csv.ConfigureCsvMapping.doExecute(ConfigureCsvMapping.java:162)
at webwork.action.ActionSupport.execute(ActionSupport.java:153)
at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:46)
at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:131)
at com.atlassian.jira.web.dispatcher.JiraServletDispatcher.service(JiraServletDispatcher.java:186)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:142)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:58)
at com.atlassian.jira.web.filters.SitemeshExcludePathFilter.doFilter(SitemeshExcludePathFilter.java:36)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:168)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at com.atlassian.seraph.filter.LoginFilter.doFilter(LoginFilter.java:177)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at com.atlassian.util.profiling.filters.ProfilingFilter.doFilter(ProfilingFilter.java:132)
at com.atlassian.jira.web.filters.ProfilingAndErrorFilter.doFilter(ProfilingAndErrorFilter.java:25)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at com.atlassian.jira.web.filters.ActionCleanupDelayFilter.doFilter(ActionCleanupDelayFilter.java:37)
at org.apache.catal