Concurrency issue in DatabasePageManger cache

The following exception tells me there is a concurrency issue with this ArrayList. Shouldn't access be synchonized, or a synchronized List?

Caused by: java.lang.ArrayIndexOutOfBoundsException: 10
at java.util.ArrayList.clear(ArrayList.java:455)
at org.apache.jetspeed.om.folder.impl.FolderImpl.resetAll(FolderImpl.java:365)
at org.apache.jetspeed.page.impl.DatabasePageManager.getAll(DatabasePageManager.java:920)
at sun.reflect.GeneratedMethodAccessor418.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:284)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:155)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:122)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:56)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
at org.apache.jetspeed.util.interceptors.PageManagerInterceptor.invoke(PageManagerInterceptor.java:46)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:174)
at $Proxy4.getAll(Unknown Source)
at org.apache.jetspeed.om.folder.impl.FolderImpl.getAll(FolderImpl.java:827)
at org.apache.jetspeed.om.folder.proxy.FolderProxy.aggregateChildren(FolderProxy.java:763)
at org.apache.jetspeed.om.folder.proxy.FolderProxy.getAll(FolderProxy.java:309)
at org.apache.jetspeed.om.folder.proxy.FolderProxy.getPages(FolderProxy.java:450)
at org.apache.jetspeed.om.folder.proxy.FolderProxy.getPage(FolderProxy.java:473)
at org.apache.jetspeed.om.folder.proxy.FolderProxy.selectDefaultPageFromAggregateFolders(FolderProxy.java:715)
at org.apache.jetspeed.om.folder.proxy.FolderProxy.getDefaultPage(FolderProxy.java:324)
at org.apache.jetspeed.om.folder.proxy.FolderProxy.invoke(FolderProxy.java:203)
at $Proxy78.getDefaultPage(Unknown Source)
at org.apache.jetspeed.portalsite.impl.PortalSiteSessionContextImpl.selectRequestPage(PortalSiteSessionContextImpl.java:465)
at org.apache.jetspeed.portalsite.impl.PortalSiteSessionContextImpl.selectRequestPage(PortalSiteSessionContextImpl.java:221)
at org.apache.jetspeed.portalsite.impl.PortalSiteRequestContextImpl.getPage(PortalSiteRequestContextImpl.java:212)
at org.apache.jetspeed.portalsite.impl.PortalSiteRequestContextImpl.getManagedPage(PortalSiteRequestContextImpl.java:195)
at org.apache.jetspeed.profiler.impl.ProfilerValveImpl.invoke(ProfilerValveImpl.java:248)
... 43 more