Hi all,
I have the following code:

Query query = session.createQuery("select p from Project p");
System.out.println("List" + query.list());

But on 'query.list()' operation it gives :

org.hibernate.exception.GenericJDBCException: could not execute query

If I run query like :
select p.projectId from Project p

It is running.
But query like : 'from project' - It is throwing an exception.

Please help me out

Hi,

Try this,
Query query = session.createQuery("from Project p");
System.out.println("List" + query.list());

Look into the link below
http://www.hibernate.org/hib_docs/v3/re ... ryhql.html

Hi
I tried this too, but still it is giving the same prob...

Give us the Project java class mapping file..and the full exception..

I had a similar problem.

org.hibernate.exception.GenericJDBCException: could not execute query
at org.hibernate.exception.ErrorCodeConverter.handledNonSpecificException(ErrorCodeConverter.java:92)
at org.hibernate.exception.ErrorCodeConverter.convert(ErrorCodeConverter.java:80)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.loader.Loader.doList(Loader.java:1565)
at org.hibernate.loader.Loader.list(Loader.java:1545)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:375)
at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:271)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:840)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:74)
at SimpleRetrieveTest.listEvents(SimpleRetrieveTest.java:131)
at SimpleRetrieveTest.task(SimpleRetrieveTest.java:114)
at SimpleRetrieveTest.access$000(SimpleRetrieveTest.java:11)
at SimpleRetrieveTest$HealthCheckTask.run(SimpleRetrieveTest.java:139)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

Last packet sent to the server was 31 ms ago.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3009)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2895)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3438)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1951)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2101)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2554)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1761)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1912)
at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:118)
at org.hibernate.loader.Loader.getResultSet(Loader.java:1239)
at org.hibernate.loader.Loader.doQuery(Loader.java:374)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:210)
at org.hibernate.loader.Loader.doList(Loader.java:1562)
... 11 more
Caused by: java.net.SocketException: Software caused connection abort: recv failed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:113)
at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:160)
at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:188)
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2452)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2906)
... 23 more

The above happens only when querying list(). Is does not occur while performing other operations.

I tried to configure the c3p0 properties. Check this http://hibernatedb.blogspot.com/2009/05 ... te-to.html