When receiving a NoClassDefFoundError TransactionUtil exception when setting up JIRA using WAR make sure that all required libraries are installed.
java.lang.NoClassDefFoundError: org/ofbiz/core/entity/TransactionUtil com.atlassian.jira.web.filters.steps.requestcleanup.RequestCleanupStep.finallyAfterDoFilter(RequestCleanupStep.java:63) com.atlassian.jira.web.filters.steps.ChainedFilterStepRunner.doFilter(ChainedFilterStepRunner.java:85) com.atlassian.core.filters.cache.AbstractCachingFilter.doFilter(AbstractCachingFilter.java:33) com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:31) com.atlassian.core.filters.encoding.AbstractEncodingFilter.doFilter(AbstractEncodingFilter.java:41) com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:31) com.atlassian.jira.web.filters.PathMatchingEncodingFilter.doFilter(PathMatchingEncodingFilter.java:49) com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:31) com.atlassian.jira.startup.JiraStartupChecklistFilter.doFilter(JiraStartupChecklistFilter.java:74) com.atlassian.multitenant.servlet.MultiTenantServletFilter.doFilter(MultiTenantServletFilter.java:91) com.atlassian.jira.web.filters.steps.ChainedFilterStepRunner.doFilter(ChainedFilterStepRunner.java:78)