ConcurrentModificationException in CacheManager.
------------------------------------------------
Key: JCR-3194
URL: https://issues.apache.org/jira/browse/JCR-3194
Project: Jackrabbit Content Repository
Issue Type: Bug
Affects Versions: 2.3.4
Reporter: Mat Lowery
Using the test code below, I was able to produce this stack:
java.util.ConcurrentModificationException
at java.util.WeakHashMap$HashIterator.nextEntry(WeakHashMap.java:762)
at java.util.WeakHashMap$KeyIterator.next(WeakHashMap.java:795)
at
org.apache.jackrabbit.core.cache.CacheManager.logCacheStats(CacheManager.java:164)
at
org.apache.jackrabbit.core.cache.CacheManager.cacheAccessed(CacheManager.java:137)
at
org.apache.jackrabbit.core.cache.AbstractCache.recordCacheAccess(AbstractCache.java:122)
at
org.apache.jackrabbit.core.cache.ConcurrentCache.get(ConcurrentCache.java:122)
at
org.apache.jackrabbit.core.state.MLRUItemStateCache.retrieve(MLRUItemStateCache.java:71)
at
org.apache.jackrabbit.core.state.ItemStateReferenceCache.retrieve(ItemStateReferenceCache.java:139)
at
org.apache.jackrabbit.core.state.SharedItemStateManager.getNonVirtualItemState(SharedItemStateManager.java:1716)
at
org.apache.jackrabbit.core.state.SharedItemStateManager.getItemState(SharedItemStateManager.java:268)
at
org.apache.jackrabbit.core.state.LocalItemStateManager.getNodeState(LocalItemStateManager.java:110)
at
org.apache.jackrabbit.core.state.LocalItemStateManager.getItemState(LocalItemStateManager.java:175)
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:382)
at org.apache.jackrabbit.core.ItemManager.getItem(ItemManager.java:328)
at org.apache.jackrabbit.core.ItemManager.getItem(ItemManager.java:622)
at
org.apache.jackrabbit.core.ItemManager.getRootNode(ItemManager.java:531)
at
org.apache.jackrabbit.core.SessionImpl.getRootNode(SessionImpl.java:760)
at test.JackrabbitTest$1.run(JackrabbitTest.java:37)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
-------------------------
package test;
import java.io.File;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import javax.jcr.Repository;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
import javax.jcr.SimpleCredentials;
import org.apache.jackrabbit.core.TransientRepository;
public class JackrabbitTest {
public static void main(final String[] args) throws Exception {
File dir = File.createTempFile("jackrabbit-test", "");
dir.delete();
dir.mkdir();
System.out.println("created temporary directory: " +
dir.getAbsolutePath());
dir.deleteOnExit();
final Repository jcrRepo = new TransientRepository(dir);
final AtomicBoolean passed = new AtomicBoolean(true);
final AtomicInteger counter = new AtomicInteger(0);
ExecutorService executor = Executors.newFixedThreadPool(50);
Runnable runnable = new Runnable() {
@Override
public void run() {
try {
Session session = jcrRepo.login(
new SimpleCredentials("admin",
"admin".toCharArray()));
session.getRootNode().addNode("n" +
counter.getAndIncrement()); //unique name
session.save();
session.logout();
} catch (RepositoryException e) {
e.printStackTrace();
passed.set(false);
}
}
};
System.out.println("Running threads");
for (int i = 0; i< 500; i++) {
executor.execute(runnable);
}
executor.shutdown(); //Disable new tasks from being submitted
if (!executor.awaitTermination(120, TimeUnit.SECONDS)) {
System.err.println("timeout");
System.exit(1);
}
if (!passed.get()) {
System.err.println("one or more threads got an exception");
System.exit(1);
} else {
System.out.println("all threads ran with no exceptions");
System.exit(0);
}
}
}
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