Due to an unsynchronized method call in Ofbiz, it is possible for the JIRA issue cache to eventually become corrupt, resulting in users seeing errors like the following when viewing issues:

java.lang.NullPointerException
at java.util.LinkedList.addBefore(Unknown Source)
at java.util.LinkedList.addFirst(Unknown Source)
at org.ofbiz.core.util.UtilCache.put(UtilCache.java:196)
at com.atlassian.jira.issue.cache.IssueCache.addIssueCacheValueToCache(IssueCache.java:179)
at com.atlassian.jira.issue.cache.IssueCache.getIssue(IssueCache.java:134)
at com.atlassian.jira.issue.cache.IssueCache.getIssue(IssueCache.java:112)
at com.atlassian.jira.issue.cache.DefaultCacheManager.getValueByAttribute(DefaultCacheManager.java:66)
at com.atlassian.jira.issue.managers.CachingIssueManager.getIssue(CachingIssueManager.java:42)
at sun.reflect.GeneratedMethodAccessor113.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.atlassian.util.profiling.object.ObjectProfiler.profiledInvoke(ObjectProfiler.java:71)
at com.atlassian.jira.config.component.DelegatingInvocationHandler.invoke(DelegatingInvocationHandler.java:27)
at $Proxy2.getIssue(Unknown Source)
at com.atlassian.jira.servlet.QuickLinkServlet.service(QuickLinkServlet.java:46)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:142)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:58)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:168)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)