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Got error "Duplicate entry " ,while making performance testing

Got error "Duplicate entry " ,while making performance testing.

Could you tell me why?

here is the detail information:

com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry ‘test2-63140’ for key ‘PRIMARY’

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessor Impl.java:39)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructor AccessorImpl.java:27)

at java.lang.reflect.Constructor.newInstance(Constructor.java:513)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)

at com.mysql.jdbc.Util.getInstance(Util.java:384)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1039)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4232)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4164)

at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2615)

at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2776)

at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2838)

at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2082)

at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2334)

at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2262)

at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2246)

at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.ja va:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at org.logicalcobwebs.proxool.ProxyStatement.invoke(ProxyStatement.java:100)

at org.logicalcobwebs.proxool.ProxyStatement.intercept(ProxyStatement.java:57)

at $java.sql.PreparedStatement$$EnhancerByProxool$$51ee3595.executeUpdate()

at org.jivesoftware.openfire.OfflineMessageStore.addMessage(OfflineMessageStore.ja va:156)

    at org.jivesoftware.openfire.OfflineMessageStrategy.store(OfflineMessageStrategy.j ava:154)

at org.jivesoftware.openfire.OfflineMessageStrategy.storeOffline(OfflineMessageStr ategy.java:114)

at org.jivesoftware.openfire.MessageRouter.routingFailed(MessageRouter.java:256)

at org.jivesoftware.openfire.spi.RoutingTableImpl.routePacket(RoutingTableImpl.jav a:257)

at org.jivesoftware.openfire.MessageRouter.route(MessageRouter.java:138)

at org.jivesoftware.openfire.spi.PacketRouterImpl.route(PacketRouterImpl.java:80)

at org.jivesoftware.openfire.net.StanzaHandler.processMessage(StanzaHandler.java:3 66)

at org.jivesoftware.openfire.net.ClientStanzaHandler.processMessage(ClientStanzaHa ndler.java:107)

at org.jivesoftware.openfire.net.StanzaHandler.process(StanzaHandler.java:220)

at org.jivesoftware.openfire.net.StanzaHandler.process(StanzaHandler.java:187)

at org.jivesoftware.openfire.nio.ConnectionHandler.messageReceived(ConnectionHandl er.java:181)

at org.apache.mina.common.support.AbstractIoFilterChain$TailFilter.messageReceived (AbstractIoFilterChain.java:570)

at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(Ab stractIoFilterChain.java:299)

at org.apache.mina.common.support.AbstractIoFilterChain.access$1100(AbstractIoFilt erChain.java:53)

at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageReceive d(AbstractIoFilterChain.java:648)

at org.apache.mina.common.IoFilterAdapter.messageReceived(IoFilterAdapter.java:80)

at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(Ab stractIoFilterChain.java:299)

at org.apache.mina.common.support.AbstractIoFilterChain.access$1100(AbstractIoFilt erChain.java:53)

at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageReceive d(AbstractIoFilterChain.java:648)

at org.apache.mina.filter.codec.support.SimpleProtocolDecoderOutput.flush(SimplePr otocolDecoderOutput.java:58)

at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecF ilter.java:185)

at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(Ab stractIoFilterChain.java:299)

at org.apache.mina.common.support.AbstractIoFilterChain.access$1100(AbstractIoFilt erChain.java:53)

at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageReceive d(AbstractIoFilterChain.java:648)

at org.apache.mina.filter.executor.ExecutorFilter.processEvent(ExecutorFilter.java :239)

at org.apache.mina.filter.executor.ExecutorFilter$ProcessEventsRunnable.run(Execut orFilter.java:283)

at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java: 895)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)

at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51)

at java.lang.Thread.run(Thread.java:662)