I did get this error when I've upgraded from 5.0 to 5.1.
It was related to https://jira.codehaus.org/browse/SONAR-4778. See http://sonarqube.15.x6.nabble.com/WARN-web-o-s-s-n-NotificationService-Unable-to-deliver-notification-td5035238.html for details.
It was a bug and it was supposed to be fixed in 5.1.1 with https://jira.codehaus.org/browse/SONAR-6566 as Simon Brandhof stated.
Now I've upgraded to 5.1.1 and I'm still having the same problem.
2015.06.09 09:52:48 WARN web[o.s.s.n.NotificationService] Unable to deliver notification Notification{type='issue-changes', fields={new.resolution=FIXED, old.status=OPEN, projectKey=xxxxxx, new.status=CLOSED, ruleName=Public types, methods and fields (API) should be documented with Javadoc, reporter=null, assignee=xxxxxx, message=Document this public constructor., old.reso
lution=null, projectName=xxxxxxxx, componentKey=null, key=d7571ab9-ac49-41c9-9973-35d4a1ee83cf}} for user xxxxx via EmailNotificationChannel
javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: could not execute query
at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:614) ~[hibernate-entitymanager-3.4.0.GA.jar:3.4.0.GA]
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:76) ~[hibernate-entitymanager-3.4.0.GA.jar:3.4.0.GA]
at org.sonar.jpa.session.JpaDatabaseSession.getSingleResult(JpaDatabaseSession.java:207) ~[sonar-core-5.1.1.jar:na]
at org.sonar.jpa.session.JpaDatabaseSession.getSingleResult(JpaDatabaseSession.java:238) ~[sonar-core-5.1.1.jar:na]
at org.sonar.core.user.HibernateUserFinder.findByLogin(HibernateUserFinder.java:47) ~[sonar-core-5.1.1.jar:na]
at org.sonar.plugins.emailnotifications.EmailNotificationChannel.deliver(EmailNotificationChannel.java:98) ~[na:na]
at org.sonar.server.notifications.NotificationService.dispatch(NotificationService.java:200) [sonar-server-5.1.1.jar:na]
at org.sonar.server.notifications.NotificationService.deliver(NotificationService.java:190) [sonar-server-5.1.1.jar:na]
at org.sonar.server.computation.step.SendIssueNotificationsStep.doExecute(SendIssueNotificationsStep.java:83) [sonar-server-5.1.1.jar:na]
at org.sonar.server.computation.step.SendIssueNotificationsStep.execute(SendIssueNotificationsStep.java:66) [sonar-server-5.1.1.jar:na]
at org.sonar.server.computation.ComputationService.process(ComputationService.java:89) [sonar-server-5.1.1.jar:na]
at org.sonar.server.computation.ComputationContainer.execute(ComputationContainer.java:47) [sonar-server-5.1.1.jar:na]
at org.sonar.server.computation.ComputationThread.run(ComputationThread.java:58) [sonar-server-5.1.1.jar:na]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_45]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_45]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_45]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_45]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_45]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_45]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_45]
Caused by: org.hibernate.exception.JDBCConnectionException: could not execute query
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:97) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.loader.Loader.doList(Loader.java:2235) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2129) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.loader.Loader.list(Loader.java:2124) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:363) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1149) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1149) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:67) ~[hibernate-entitymanager-3.4.0.GA.jar:3.4.0.GA]
... 18 common frames omitted
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_45]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_45]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_45]
at java.lang.reflect.Constructor.newInstance(Constructor.java:422) ~[na:1.8.0_45]
at com.mysql.jdbc.Util.handleNewInstance(Util.java:377) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.Util.getInstance(Util.java:360) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:935) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:924) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:870) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.ConnectionImpl.throwConnectionClosedException(ConnectionImpl.java:1232) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.java:1225) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4104) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4073) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at org.apache.commons.dbcp.DelegatingConnection.prepareStatement(DelegatingConnection.java:281) ~[commons-dbcp-1.4.jar:1.4]
at org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.prepareStatement(PoolingDataSource.java:313) ~[commons-dbcp-1.4.jar:1.4]
at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:534) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:452) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:161) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1577) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.loader.Loader.doQuery(Loader.java:696) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.loader.Loader.doList(Loader.java:2232) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
... 26 common frames omitted
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 264Â 434Â 682 milliseconds ago. The last packet sent successfully to
ur application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.ction validity before use in yo at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_45]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_45]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_45]
at java.lang.reflect.Constructor.newInstance(Constructor.java:422) ~[na:1.8.0_45]
at com.mysql.jdbc.Util.handleNewInstance(Util.java:377) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1036) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3661) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2417) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2530) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1907) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2030) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1907) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2030) ~[mysql-connector-java-5.1.34.jar:5.1.34]
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96) ~[commons-dbcp-1.4.jar:1.4]
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96) ~[commons-dbcp-1.4.jar:1.4]
at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.loader.Loader.getResultSet(Loader.java:1812) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
at org.hibernate.loader.Loader.doQuery(Loader.java:697) ~[hibernate-core-3.3.2.GA.jar:3.3.2.GA]
... 28 common frames omitted
Caused by: java.net.SocketException: Relais brisé (pipe)
at java.net.SocketOutputStream.socketWrite0(Native Method) ~[na:1.8.0_45]
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:109) ~[na:1.8.0_45]
at java.net.SocketOutputStream.write(SocketOutputStream.java:153) ~[na:1.8.0_45]
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82) ~[na:1.8.0_45]
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140) ~[na:1.8.0_45]
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3643) ~[mysql-connector-java-5.1.34.jar:5.1.34]
... 38 common frames omitted
I don't have access to the Jira, so I cannot add a comment to the bug. Can you please help me with this.
Here's the database configuration from the system information page :
Database
Database MySQL
Database Version 5.5.37-log
Username sonarqube@xxxxxxxxxxx
URL jdbc:mysql://xxxxxxxxxx/sonarqube?useUnicode=true&characterEncoding=utf8&rewriteBatchedStatements=true&useConfigs=maxPerformance
Driver MySQL Connector Java
Driver Version mysql-connector-java-5.1.34 ( Revision: jess.balint@oracle.com-20141014163213-wqbwpf1ok2kvo1om )
Version Status UP_TO_DATE
Pool Active Connections 2
Pool Max Connections 50
Pool Initial Size 0
Pool Idle Connections 3
Pool Min Idle Connections 2
Pool Max Idle Connections 5
Pool Max Wait (ms) 5000
Pool Remove Abandoned false
Pool Remove Abandoned Timeout (seconds) 300
来源：https://stackoverflow.com/questions/30852758/warn-webo-s-s-n-notificationservice-unable-to-deliver-notification