Problem sending emails: java.io.EOFException

[hari]

Openemm is not able to send our mails.

Following exception occured. 20081113-openemm-mailgun.log:
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[13.11.2008 06:17:38] DEBUG/dbase/(2/2/155/550): DB-Exec: SELECT cust.customer_id, bind.user_type,cust.firstname,cust.mailtype,cust.sync_validate,cust.email
FROM customer_2_tbl cust, TMP_CRT_W_155_550_TBL bind WHERE cust.customer_id = bind.customer_id AND (bind.user_type = 'W')
[13.11.2008 06:19:18] DEBUG/dbase/(2/2/155/550): DB-Exec failed: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying excep
tion:

** BEGIN NESTED EXCEPTION **

java.io.EOFException

STACKTRACE:

java.io.EOFException
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1905)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2404)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2862)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:771)
at com.mysql.jdbc.MysqlIO.nextRow(MysqlIO.java:1289)
at com.mysql.jdbc.MysqlIO.readSingleRowSet(MysqlIO.java:2272)
at com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:423)
at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:1962)
at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:1385)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1728)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2988)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2917)
at com.mysql.jdbc.Statement.executeQuery(Statement.java:824)
at org.agnitas.backend.DBase.execQuery(DBase.java:265)
at org.agnitas.backend.DBase.execQuery(DBase.java:282)
at org.agnitas.backend.MailgunImpl.doExecute(MailgunImpl.java:394)
at org.agnitas.backend.MailgunImpl.fire(MailgunImpl.java:617)
at org.agnitas.backend.RulerImpl.kickOffDelayed(RulerImpl.java:354)
at sun.reflect.GeneratedMethodAccessor51.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:248)
at org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean$MethodInvokingJob.executeInternal(MethodInvokingJobDetailFactoryBean.java
:165)
at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:90)
at org.quartz.core.JobRunShell.run(JobRunShell.java:195)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:520)

** END NESTED EXCEPTION **

After restarting the system the mail was sent. This happened twice last month. It never happened before.
What's the reason?

Is there any way to get arround this?
Thanks & best regards,
hari