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Connection to Postgres database lost

On a performance server - with rather a big load, i have a weird behavior.
From one moment in time all the connection the database start to say "connection has been closed".
The only hint so far is this IOException :
Caused by: org.postgresql.util.PSQLException: An I/O error occurred while sending to the backend.
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:314)
at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:430)
at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:356)
at org.postgresql.jdbc.PgPreparedStatement.executeWithFlags(PgPreparedStatement.java:168)
at org.postgresql.jdbc.PgPreparedStatement.executeQuery(PgPreparedStatement.java:116)
at org.jboss.resource.adapter.jdbc.WrappedPreparedStatement.executeQuery(WrappedPreparedStatement.java:342)
at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208)
at org.hibernate.loader.Loader.getResultSet(Loader.java:1812)
at org.hibernate.loader.Loader.doQuery(Loader.java:697)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
at org.hibernate.loader.Loader.doList(Loader.java:2232)
... 73 more
Caused by: java.io.IOException: Tried to send an out-of-range integer as a 2-byte value: 33001
at org.postgresql.core.PGStream.sendInteger2(PGStream.java:211)
at org.postgresql.core.v3.QueryExecutorImpl.sendParse(QueryExecutorImpl.java:1409)
at org.postgresql.core.v3.QueryExecutorImpl.sendOneQuery(QueryExecutorImpl.java:1729)
at org.postgresql.core.v3.QueryExecutorImpl.sendQuery(QueryExecutorImpl.java:1294)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:280)
... 83 more
However i can't really link it to some business scenario for the moment.
Any ideas ?

It's a PostgreSQL driver limitation, the maximum number of parameters for a query is 32768.
You have a query that exceeds that limit - and by doing so the driver has an erratic behavior of closing connections. I encountered that on a JBoss server using Hibernate with PostgreSQL and the connection closing led to a pretty messed up state of the connection pool.
This parameter is described here, in the Parse section:
"Int16 - The number of parameter data types specified".
The solution is to split that long query into smaller ones with a known number of parameters.

WLS 12C - Getting transaction is no longer active

I have configured Non-XA datasource in Weblogic and setAutoCommit(false) where few of my procedure have commit and configured transaction time in WLS for 5000
I am getting this exception
java.sql.SQLException: The transaction is no longer active - status: 'Committed'. No further JDBC access is allowed within this transaction.
at weblogic.jdbc.wrapper.JTSConnection.checkIfRolledBack(JTSConnection.java:202)
at weblogic.jdbc.wrapper.JTSConnection.checkConnection(JTSConnection.java:214)
at weblogic.jdbc.wrapper.JTSConnection.prepareCall(JTSConnection.java:610)
at weblogic.ejb.container.internal.MDListener.execute(MDListener.java:451)
at weblogic.ejb.container.internal.MDListener.transactionalOnMessage(MDListener.java:375)
at weblogic.ejb.container.internal.MDListener.onMessage(MDListener.java:310)
at weblogic.jms.client.JMSSession.onMessage(JMSSession.java:4855)
at weblogic.jms.client.JMSSession.execute(JMSSession.java:4529)
at weblogic.jms.client.JMSSession.executeMessage(JMSSession.java:3976)
at weblogic.jms.client.JMSSession.access$000(JMSSession.java:120)
at weblogic.jms.client.JMSSession$UseForRunnable.run(JMSSession.java:5375)
at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:548)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:311)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:263)
I am getting the below error message,
java.sql.SQLException: The transaction is no longer active - status: 'Committed'. No further JDBC access is allowed within this transaction.
at weblogic.jdbc.wrapper.JTSConnection.checkIfRolledBack(JTSConnection.java:202)
at weblogic.jdbc.wrapper.JTSConnection.checkConnection(JTSConnection.java:214)
at weblogic.jdbc.wrapper.Connection.preInvocationHandler(Connection.java:98)
at weblogic.jdbc.wrapper.JTSConnection_oracle_jdbc_driver_T4CConnection.physicalConnectionWithin(Unknown Source)
at oracle.sql.CLOB.createTemporary(CLOB.java:1118)
at oracle.sql.CLOB.createTemporary(CLOB.java:1078)
at weblogic.ejb.container.internal.MDListener.execute(MDListener.java:451)
at weblogic.ejb.container.internal.MDListener.transactionalOnMessage(MDListener.java:375)
at weblogic.ejb.container.internal.MDListener.onMessage(MDListener.java:310)
at weblogic.jms.client.JMSSession.onMessage(JMSSession.java:4855)
at weblogic.jms.client.JMSSession.execute(JMSSession.java:4529)
at weblogic.jms.client.JMSSession.executeMessage(JMSSession.java:3976)
at weblogic.jms.client.JMSSession.access$000(JMSSession.java:120)
at weblogic.jms.client.JMSSession$UseForRunnable.run(JMSSession.java:5375)
at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:548)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:311)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:263)
I am using the below code to insert data to a table,
java.sql.Clob clobData = oracle.sql.CLOB.createTemporary(conn,
false, oracle.sql.CLOB.DURATION_SESSION);

error when merge using hibernate 3 and ojdbc 7 [duplicate]

This question already has answers here:
java.lang.ArrayIndexOutOfBoundsException at oracle.jdbc.driver.T4CTTIrxd.readBitVector(T4CTTIrxd.java:135)
(2 answers)
Closed 5 years ago.
I get an error when I save my entity using the merge() method from EntityManager. This issue happens when I use Hibernate 3 combined with ojdbc7 12.1.0.2.0 JDBC 4.1, but if I change to ojdbc6 11.2.0.3.0 JDBC 4.0 this error will disappear. Can anyone help to resolve my problem, because I need to use ojdbc7.
>[2017-03-30 14:52:42.184]: ERROR - TransactionAspectSupport.completeTransactionAfterThrowing(408) | Application exception overridden by rollback exception
org.springframework.orm.jpa.JpaSystemException: org.hibernate.exception.GenericJDBCException: could not load an entity: [com.mycomp.casa.persistence.model.CustomerAccountOpening#554]; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: could not load an entity: [com.mycomp.casa.persistence.model.CustomerAccountOpening#554]
at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:321)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:404)
at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:58)
at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:163)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:90)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:622)
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: could not load an entity: [com.mycomp.casa.persistence.model.CustomerAccountOpening#554]
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1214)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1147)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1153)
at org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:695)
at sun.reflect.GeneratedMethodAccessor915.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240)
at com.sun.proxy.$Proxy104.merge(Unknown Source)
Caused by: org.hibernate.exception.GenericJDBCException: could not load an entity: [com.mycomp.casa.persistence.model.CustomerAccountOpening#554]
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:140)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:128)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.loader.Loader.loadEntity(Loader.java:2041)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:86)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:76)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3293)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:496)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:477)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:227)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:285)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:152)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:1090)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:1038)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:630)
at org.hibernate.type.EntityType.resolve(EntityType.java:438)
at org.hibernate.type.EntityType.replace(EntityType.java:298)
at org.hibernate.type.AbstractType.replace(AbstractType.java:176)
at org.hibernate.type.TypeHelper.replace(TypeHelper.java:212)
at org.hibernate.event.def.DefaultMergeEventListener.copyValues(DefaultMergeEventListener.java:600)
at org.hibernate.event.def.DefaultMergeEventListener.mergeTransientEntity(DefaultMergeEventListener.java:337)
at org.hibernate.event.def.DefaultMergeEventListener.entityIsTransient(DefaultMergeEventListener.java:303)
at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:258)
at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:84)
at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:867)
at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:851)
at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:855)
at org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:686)
... 143 more
Caused by: java.sql.SQLException: Error
at org.jboss.jca.adapters.jdbc.WrappedConnection.checkException(WrappedConnection.java:1972)
at org.jboss.jca.adapters.jdbc.WrappedStatement.checkException(WrappedStatement.java:1446)
at org.jboss.jca.adapters.jdbc.WrappedResultSet.checkException(WrappedResultSet.java:5986)
at org.jboss.jca.adapters.jdbc.WrappedResultSet.next(WrappedResultSet.java:2693)
at org.hibernate.loader.Loader.doQuery(Loader.java:825)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
at org.hibernate.loader.Loader.loadEntity(Loader.java:2037)
... 167 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 128
at oracle.jdbc.driver.T4CTTIrxd.readBitVector(T4CTTIrxd.java:135)
at oracle.jdbc.driver.T4C8TTIrxh.unmarshalV10(T4C8TTIrxh.java:123)
at oracle.jdbc.driver.T4C8Oall.readRXH(T4C8Oall.java:678)
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:436)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:257)
at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:587)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:225)
at oracle.jdbc.driver.T4CPreparedStatement.fetch(T4CPreparedStatement.java:1066)
at oracle.jdbc.driver.OracleStatement.fetchMoreRows(OracleStatement.java:3716)
at oracle.jdbc.driver.InsensitiveScrollableResultSet.fetchMoreRows(InsensitiveScrollableResultSet.java:1015)
at oracle.jdbc.driver.InsensitiveScrollableResultSet.absoluteInternal(InsensitiveScrollableResultSet.java:979)
at oracle.jdbc.driver.InsensitiveScrollableResultSet.next(InsensitiveScrollableResultSet.java:579)
at org.jboss.jca.adapters.jdbc.WrappedResultSet.next(WrappedResultSet.java:2689)
... 170 more

Had the same problem using the 12.1.0.2 driver with an Oracle 10g database. It happens apparently when the driver is performing a fetch - querying the database for more rows while scrolling through a ResultSet.
Looks like a nasty bug in the driver as #MarkRotteveel pointed out in his comment.
Incrementing the fetchSize property worked well as a temporary workaround to avoid the issue, forcing the driver to retrieve all results at once with no data left to fetch, but it is not a long-term solution and may have a large negative impact on performance/memory depending on the size and amount of data the query is retrieving.
If you're using Hibernate, try to identify the query that is raising the exception (use for instance hibernate.show_sql), check how many rows does it return and adjust the hibernate.jdbc.fetch_size property accordingly.
A non-zero value determines the JDBC fetch size (calls Statement.setFetchSize()).
Or try using a different version of the driver. This exception didn't happen with 12.1.0.1 if I remember correctly.

If you are using Oracle 12c, try using Oracle12cDialect for the dialect.

Hibernate and Spring-boot too many database connection and high server load on 150 requests/second

I have spring boot application and I am using JPA and hibernate with oracle database. On high throughput 150 requests/second database stop allowing database connection and also database load goes unusually very high .
Here is my database configuration properties
spring.datasource.url=jdbc:oracle:thin:#<ip>:1521:<dbname>
spring.datasource.username=*******
spring.datasource.password=*******
spring.datasource.driver-class-name=oracle.jdbc.OracleDriver
spring.datasource.initial-size=10
spring.datasource.maxActive=1200
spring.datasource.validationQuery=select 1 from dual
spring.jpa.hibernate.dialect = org.hibernate.dialect.Oracle10gDialect
spring.jpa.show-sql = true
spring.jpa.hibernate.naming_strategy=org.hibernate.cfg.EJB3NamingStrategy
spring.datasource.pool-prepared-statements=true
spring.datasource.pool-prepared-statements-cache-size=250
spring.datasource.max-open-prepared-statements=250
spring.datasource.max-idle=50
spring.datasource.min-idle=10
spring.datasource.time-between-eviction-runs-millis=30000
spring.datasource.min-evictable-idle-time-millis=60000
spring.datasource.suspect-timeout=60
spring.datasource.log-abandoned=true
Here is the exception that I am getting
Could not open JPA EntityManager for transaction; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: Could not open connection
at net.bull.javamelody.JdbcWrapper$DelegatingInvocationHandler.invoke(JdbcWrapper.java:286)
at com.sun.proxy.$Proxy85.getConnection(Unknown Source)
at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:139)
at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:380)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:228)
... 21 more
Caused by: oracle.net.ns.NetException: The Network Adapter could not establish the connection
at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:392)
at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:434)
at oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:687)
at oracle.net.ns.NSProtocol.connect(NSProtocol.java:247)
at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1102)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:320)
... 40 more
Caused by: java.net.SocketTimeoutException: connect timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at oracle.net.nt.TcpNTAdapter.connect(TcpNTAdapter.java:150)
at oracle.net.nt.ConnOption.connect(ConnOption.java:133)
at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:370)
... 45 more
org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: Could not open connection
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:431)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:373)
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:427)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:276)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at net.bull.javamelody.MonitoringSpringInterceptor.invoke(MonitoringSpringInterceptor.java:73)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)
at com.sun.proxy.$Proxy133.updateDlrStatus(Unknown Source)
at com.acl.otp.thread.DlrRequestHandler.updateDLRStatus(DlrRequestHandler.java:39)
at com.acl.otp.thread.DlrRequestHandler.run(DlrRequestHandler.java:32)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: Could not open connection
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1763)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1677)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:1771)
at org.hibernate.jpa.internal.TransactionImpl.begin(TransactionImpl.java:64)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.beginTransaction(HibernateJpaDialect.java:170)
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:380)
... 14 more
Caused by: org.hibernate.exception.JDBCConnectionException: Could not open connection
at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:132)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:235)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:171)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:67)

You appear to be overloading the database server / service.
There is no general solution to this (no "magic bullet"), but you could look at things like:
Limit the number of requests that you handle simultaneously.
Use a profiler or other monitoring to figure out the types of request that are causing excessive database load, and seeing if they are amenable to optimization by:
Optimizing the SQL and/or the database schema
Reducing the number of queries
Caching results of common queries.
Increase the resources (cores, memory, etc) available to the front end and / or the database; i.e. get bigger / faster machines.
Switch to native SQL rather than using JPA. (At least for the most heavily used queries.)
Rearchitect your application so that it can be "scaled out"; e.g. replicating the front-end and backend, using a non-SQL database, etc.
Note that none of these is guaranteed to work in all circumstances

the EntityManager related error occurs when the maximum connections reached to database. To resolve these type of errors "don't close session factory" in hibernate and close only session(must close) and make sure the "the connection pool size is less or otherwise leave to hibernate default connection pool size and use singleton design pattern to create sessionfactory object".

Protocol violation exception in Java application

We have an application developed in java(jdk1.5 and DB is oracle 10g). At some point of time our application is giving below error and terminating. I had searched in the internet and all forums says that "this could be the driver issue (compatibility between oracle JDBC driver and DB). To resolve this we need to upgrade or we need to replace some latest version of jar files". But if I restart my application, it started working fine. I am getting this error very rarely. If it is really an driver issue, then it should not work when I restart my application.
I would like to understand that, in which scenario it can happen, since it is not happening every time.
Can any one help me on this?
Error Logs From my application:
SQL Error: 17401, SQLState: null
Protocol violation
SQL Error: 17401, SQLState: null
Protocol violation
SQL Error: 17401, SQLState: null
Protocol violation
Rollback failed
java.sql.SQLException: Protocol violation
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBE rror.java:134)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBE rror.java:179)
at oracle.jdbc.dbaccess.DBError.check_error(DBError.j ava:1160)
at oracle.jdbc.ttc7.Ocommoncall.receive(Ocommoncall.j ava:149)
at oracle.jdbc.ttc7.TTC7Protocol.rollback(TTC7Protoco l.java:488)
at oracle.jdbc.driver.OracleConnection.rollback(Oracl eConnection.java:1412)
at net.sf.hibernate.transaction.JDBCTransaction.rollb ack(JDBCTransaction.java:86)
at com.azure.spark.database.hibernate.util.HibernateU til.doSessionWork(HibernateUtil.java:90)
at com.azure.spark.database.hibernate.util.HibernateU til.doSessionWork(HibernateUtil.java:59)
at com.azure.spark.database.hibernate.util.HibernateU til.get(HibernateUtil.java:569)
at com.azure.spark.database.hibernate.util.HibernateS ession.get(HibernateSession.java:340)
at com.azure.spark.taskcontroller.TaskControllerCompo nent.taskCompleted(TaskControllerComponent.java:11 54)
at com.azure.spark.taskcontroller.TaskControllerCompo nent.onTaskEvent(TaskControllerComponent.java:1111 )
at com.azure.spark.taskcontroller.tasks.AbstractTaskC omponent.run(AbstractTaskComponent.java:354)
at java.lang.Thread.run(Thread.java:637)
Error rolling back transaction
net.sf.hibernate.TransactionException: Rollback failed with SQL exception:
at net.sf.hibernate.transaction.JDBCTransaction.rollb ack(JDBCTransaction.java:91)
at com.azure.spark.database.hibernate.util.HibernateU til.doSessionWork(HibernateUtil.java:90)
at com.azure.spark.database.hibernate.util.HibernateU til.doSessionWork(HibernateUtil.java:59)
at com.azure.spark.database.hibernate.util.HibernateU til.get(HibernateUtil.java:569)
at com.azure.spark.database.hibernate.util.HibernateS ession.get(HibernateSession.java:340)
at com.azure.spark.taskcontroller.TaskControllerCompo nent.taskCompleted(TaskControllerComponent.java:11 54)
at com.azure.spark.taskcontroller.TaskControllerCompo nent.onTaskEvent(TaskControllerComponent.java:1111 )
at com.azure.spark.taskcontroller.tasks.AbstractTaskC omponent.run(AbstractTaskComponent.java:354)
at java.lang.Thread.run(Thread.java:637)
Caused by: java.sql.SQLException: Protocol violation
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBE rror.java:134)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBE rror.java:179)
at oracle.jdbc.dbaccess.DBError.check_error(DBError.j ava:1160)
at oracle.jdbc.ttc7.Ocommoncall.receive(Ocommoncall.j ava:149)
at oracle.jdbc.ttc7.TTC7Protocol.rollback(TTC7Protoco l.java:488)
at oracle.jdbc.driver.OracleConnection.rollback(Oracl eConnection.java:1412)
at net.sf.hibernate.transaction.JDBCTransaction.rollb ack(JDBCTransaction.java:86)
... 8 more
Error setting task status to completed
net.sf.hibernate.HibernateException: Error attempting to do session work
at com.azure.spark.database.hibernate.util.HibernateU til.doSessionWork(HibernateUtil.java:96)
at com.azure.spark.database.hibernate.util.HibernateU til.doSessionWork(HibernateUtil.java:59)
at com.azure.spark.database.hibernate.util.HibernateU til.get(HibernateUtil.java:569)
at com.azure.spark.database.hibernate.util.HibernateS ession.get(HibernateSession.java:340)
at com.azure.spark.taskcontroller.TaskControllerCompo nent.taskCompleted(TaskControllerComponent.java:11 54)
at com.azure.spark.taskcontroller.TaskControllerCompo nent.onTaskEvent(TaskControllerComponent.java:1111 )
at com.azure.spark.taskcontroller.tasks.AbstractTaskC omponent.run(AbstractTaskComponent.java:354)
at java.lang.Thread.run(Thread.java:637)
Caused by: net.sf.hibernate.exception.GenericJDBCException: could not load: [com.azure.spark.database.hibernate.mappings.refere nce.impl.TaskImpl#43176610]
at net.sf.hibernate.exception.ErrorCodeConverter.hand ledNonSpecificException(ErrorCodeConverter.java:90 )
at net.sf.hibernate.exception.ErrorCodeConverter.conv ert(ErrorCodeConverter.java:79)
at net.sf.hibernate.exception.JDBCExceptionHelper.con vert(JDBCExceptionHelper.java:30)
at net.sf.hibernate.persister.AbstractEntityPersister .convert(AbstractEntityPersister.java:1332)
at net.sf.hibernate.persister.EntityPersister.load(En tityPersister.java:418)
at net.sf.hibernate.impl.SessionImpl.doLoad(SessionIm pl.java:2130)
at net.sf.hibernate.impl.SessionImpl.doLoadByClass(Se ssionImpl.java:2027)
at net.sf.hibernate.impl.SessionImpl.get(SessionImpl. java:1936)
at com.azure.spark.database.hibernate.util.HibernateU til$11.doSessionWork(HibernateUtil.java:573)
at com.azure.spark.database.hibernate.util.HibernateU til.doSessionWork(HibernateUtil.java:80)
... 7 more
Caused by: java.sql.SQLException: Protocol violation
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBE rror.java:134)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBE rror.java:179)
at oracle.jdbc.dbaccess.DBError.check_error(DBError.j ava:1160)
at oracle.jdbc.ttc7.Oclose.receive(Oclose.java:133)
at oracle.jdbc.ttc7.TTC7Protocol.close(TTC7Protocol.j ava:684)
at oracle.jdbc.driver.OracleStatement.close(OracleSta tement.java:700)
at oracle.jdbc.driver.OraclePreparedStatement.private Close(OraclePreparedStatement.java:489)
at oracle.jdbc.driver.OraclePreparedStatement.close(O raclePreparedStatement.java:396)
at net.sf.hibernate.impl.BatcherImpl.closePreparedSta tement(BatcherImpl.java:273)
at net.sf.hibernate.impl.BatcherImpl.closeStatement(B atcherImpl.java:141)
at net.sf.hibernate.impl.BatcherImpl.closeQueryStatem ent(BatcherImpl.java:157)
at net.sf.hibernate.impl.BatcherImpl.closeQueryStatem ent(BatcherImpl.java:104)
at net.sf.hibernate.loader.Loader.getResultSet(Loader .java:884)
at net.sf.hibernate.loader.Loader.doQuery(Loader.java :269)
at net.sf.hibernate.loader.Loader.doQueryAndInitializ eNonLazyCollections(Loader.java:133)
at net.sf.hibernate.loader.Loader.loadEntity(Loader.j ava:911)
at net.sf.hibernate.loader.Loader.loadEntity(Loader.j ava:931)
at net.sf.hibernate.loader.EntityLoader.load(EntityLo ader.java:59)
at net.sf.hibernate.loader.EntityLoader.load(EntityLo ader.java:51)
at net.sf.hibernate.persister.EntityPersister.load(En tityPersister.java:415)
... 12 more

I would start by upgrading your JDBC driver, and looking for class12.jar in your classpath. I also found this link that might help: https://forums.oracle.com/message/9710491

We had same issue.
We replaced ojdbc7.jar with ojdbc8.jar and it resolved issue.
Our hibernate version was 4.x.
This is caused due to CLOB field in your database, other option is to add space or extra character to your data.
More information here https://community.oracle.com/thread/3647914