When memcachedclient is called, a java. Lang. arrayindexoutofboundsexception error is returned.

Java. util. Concurrent. executionexception: Java. Lang. arrayindexoutofboundsexception
At java. util. Concurrent. futuretask $ sync. innerget (futuretask. Java: 222)
At java. util. Concurrent. futuretask. Get (futuretask. Java: 83)
At com. wonibo. projectx. Service. Index. readpsdaemon. getresult (readpsdaemon. Java: 109)
At com. wonibo. projectx. Service. Index. readpsdaemon. readps (readpsdaemon. Java: 97)
At com. wonibo. projectx. Service. Index. readpsdaemon. Run (readpsdaemon. Java: 54)
Caused by: Java. Lang. arrayindexoutofboundsexception
At java. Lang. system. arraycopy (native method)
At sun. Security. provider. digestbase. engineupdate (digestbase. Java: 110)
At java. Security. messagedigest $ delegate. engineupdate (messagedigest. Java: 537)
At java. Security. messagedigest. Update (messagedigest. Java: 293)
At com. danga. memcached. sockiopool. md5hashingalg (sockiopool. Java: 521)
At com. danga. memcached. sockiopool. gethash (sockiopool. Java: 547)
At com. danga. memcached. sockiopool. getbucket (sockiopool. Java: 557)
At com. danga. memcached. sockiopool. getsock (sockiopool. Java: 918)
At com. danga. memcached. memcachedclient. Delete (memcachedclient. Java: 447)
At com. danga. memcached. memcachedclient. Delete (memcachedclient. Java: 395)
At com. wonibo. projectx. Dao. memcache. memcachedutil. Remove (memcachedutil. Java: 167)
At com. wonibo. projectx. Dao. dbmanager. getproductbeanstatebyid (dbmanager. Java: 835)
At com. wonibo. projectx. Service. Index. readpsdaemon $ psreader. Call (readpsdaemon. Java: 133)
At com. wonibo. projectx. Service. Index. readpsdaemon $ psreader. Call (readpsdaemon. Java: 122)
At java. util. Concurrent. futuretask $ sync. innerrun (futuretask. Java: 303)
At java. util. Concurrent. futuretask. Run (futuretask. Java: 138)
At java. util. Concurrent. executors $ runnableadapter. Call (executors. Java: 441)
At java. util. Concurrent. futuretask $ sync. innerrun (futuretask. Java: 303)
At java. util. Concurrent. futuretask. Run (futuretask. Java: 138)
At java. util. Concurrent. scheduledthreadpoolexecutor $ scheduledfuturetask. Access $301 (scheduledthreadpoolexecutor. Java: 98)
At java. util. Concurrent. scheduledthreadpoolexecutor $ scheduledfuturetask. Run (scheduledthreadpoolexecutor. Java: 207)
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: 619)

The reason is that messagedigest instance is not thread-safe. If syncronize is required for multi-threaded calling, this is not the optimal solution. I don't know if there are other solutions.

Write it down first, and then find a solution.

Similar Problem: http://www.javaeye.com/topic/186965