[JCR-3013] ArrayIndexOutOfBoundsException: ConcurrentCache

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.5, 2.2.7
• Fix Version/s: 2.2.8
• Component/s: jackrabbit-core

Environment

My Platform:
- Linux Debian (64)
- sun
  java version "1.6.0_22"
  Java(TM) SE Runtime Environment (build 1.6.0_22-b04)
  Java HotSpot(TM) 64-Bit Server VM (build 17.1-b03, mixed mode)

- MemTotal: 49563216 kB
- Intel(R) Xeon(R) CPU E5530 @ 2.40GHz
- apache sling / JCR Cluster

• Assignee: Unassigned
• Reporter: Michael Klenk
• Created: 06/Jul/11 12:26
• Updated: 21/Dec/11 11:04
• Resolved: 06/Jul/11 13:18

Description

ArrayIndexOutOfBoundsException after several days of uptime.

I'm experiencing some strange ArrayIndexOutOfBoundsExceptions on
accessing the jackrabbit ConcurrentCache in 2.2.5. in Line 241 during
shrinkIfNeeded check.

Caused by: java.lang.ArrayIndexOutOfBoundsException: -14
at
org.apache.jackrabbit.core.cache.ConcurrentCache.shrinkIfNeeded(ConcurrentCache.java:241)

I reviewed jackrabbit-code and I'm sure it's caused by that
AtomicInteger for realizing accessCounter in AbstractCache, which will
have become negative during increasing over the Integer.MAX_VALUE constant.

// Semi-random start index to prevent bias against the first
segments
int start = (int) getAccessCount() % segments.length;
for (int i = start; isTooBig(); i = (i + 1) % segments.length) {
synchronized (segments[i]) {

___________________________

Uncaught Throwable java.lang.ArrayIndexOutOfBoundsException: -7
at
org.apache.jackrabbit.core.cache.ConcurrentCache.shrinkIfNeeded(ConcurrentCache.java:241)
at
org.apache.jackrabbit.core.cache.ConcurrentCache.put(ConcurrentCache.java:176)
at
org.apache.jackrabbit.core.persistence.bundle.AbstractBundlePersistenceManager.getBundle(AbstractBundlePersistenceManager.java:657)
at
org.apache.jackrabbit.core.persistence.bundle.AbstractBundlePersistenceManager.load(AbstractBundlePersistenceManager.java:400)
at
org.apache.jackrabbit.core.state.SharedItemStateManager.loadItemState(SharedItemStateManager.java:1819)
at
org.apache.jackrabbit.core.state.SharedItemStateManager.getNonVirtualItemState(SharedItemStateManager.java:1739)
at
org.apache.jackrabbit.core.state.SharedItemStateManager.getItemState(SharedItemStateManager.java:261)
at
org.apache.jackrabbit.core.state.LocalItemStateManager.getNodeState(LocalItemStateManager.java:107)
at
org.apache.jackrabbit.core.state.LocalItemStateManager.getItemState(LocalItemStateManager.java:172)
at
org.apache.jackrabbit.core.state.XAItemStateManager.getItemState(XAItemStateManager.java:260)
at
org.apache.jackrabbit.core.state.SessionItemStateManager.getItemState(SessionItemStateManager.java:161)
at
org.apache.jackrabbit.core.ItemManager.getItemData(ItemManager.java:370)
at
org.apache.jackrabbit.core.ItemManager.getItem(ItemManager.java:316)
at
org.apache.jackrabbit.core.ItemManager.getItem(ItemManager.java:610)
at
org.apache.jackrabbit.core.SessionImpl.getNodeById(SessionImpl.java:493)
at
org.apache.jackrabbit.core.SessionImpl.getNodeByIdentifier(SessionImpl.java:1045)
at sun.reflect.GeneratedMethodAccessor31.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.sling.jcr.base.SessionProxyHandler$SessionProxyInvocationHandler.invoke(SessionProxyHandler.java:109)
at $Proxy2.getNodeByIdentifier(Unknown Source)
at
de.dig.cms.frontend.servlet.helper.ResourceUtil.findResourceById(ResourceUtil.java:44)
at
de.dig.cms.frontend.servlet.CMSContentEnrichServletFilter.doFilter(CMSContentEnrichServletFilter.java:194)
at
org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
at
de.dig.cms.frontend.servlet.CacheControlFilter.doFilter(CacheControlFilter.java:120)
at
org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
at
de.dig.cms.cache.impl.WallCacheServletFilter.processCacheableRequest(WallCacheServletFilter.java:244)
at
de.dig.cms.cache.impl.WallCacheServletFilter.processCacheableRequestWithLatch(WallCacheServletFilter.java:185)
at
de.dig.cms.cache.impl.WallCacheServletFilter.doFilter(WallCacheServletFilter.java:154)
at
org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
at
de.dig.cms.frontend.servletapi.CMSSlingHttpServletRequestFilter.doFilter(CMSSlingHttpServletRequestFilter.java:52)
at
org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
at
org.apache.sling.engine.impl.SlingMainServlet.service(SlingMainServlet.java:313)
at
org.apache.sling.engine.impl.SlingMainServlet.service(SlingMainServlet.java:207)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:389)
at
org.ops4j.pax.web.service.internal.HttpServiceServletHandler.handle(HttpServiceServletHandler.java:64)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at
org.ops4j.pax.web.service.internal.HttpServiceContext.handle(HttpServiceContext.java:111)
at
org.ops4j.pax.web.service.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:64)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:535)
at
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:865)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:539)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at
org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:520)