I see this error when i tried to upgrade from 5.11 to 5.12 AND during new install of 5.12
12:34:02,916 [Thread-3] ERROR org.activiti.engine.impl.interceptor.CommandContext - Error while closing command context
org.apache.ibatis.exceptions.PersistenceException:
### Error updating database. Cause: java.sql.SQLIntegrityConstraintViolationException: ORA-02292: integrity constraint (ACTIVITI.ACT_FK_IDL_PROCINST) violated - child record found
### The error may involve org.activiti.engine.impl.persistence.entity.ExecutionEntity.deleteExecution-Inline
### The error occurred while setting parameters
### SQL: delete from ACT_RU_EXECUTION where ID_ = ? and REV_ = ?
### Cause: java.sql.SQLIntegrityConstraintViolationException: ORA-02292: integrity constraint (ACTIVITI.ACT_FK_IDL_PROCINST) violated - child record found
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:23)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:147)
at org.apache.ibatis.session.defaults.DefaultSqlSession.delete(DefaultSqlSession.java:158)
at org.activiti.engine.impl.db.DbSqlSession$DeletePersistentObjectOperation.execute(DbSqlSession.java:237)
at org.activiti.engine.impl.db.DbSqlSession.flushDeletes(DbSqlSession.java:668)
at org.activiti.engine.impl.db.DbSqlSession.flush(DbSqlSession.java:462)
at org.activiti.engine.impl.interceptor.CommandContext.flushSessions(CommandContext.java:168)
at org.activiti.engine.impl.interceptor.CommandContext.close(CommandContext.java:115)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:70)
at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:42)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)
at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:40)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:31)
at org.activiti.engine.impl.TaskServiceImpl.complete(TaskServiceImpl.java:159)
at org.activiti.explorer.demo.DemoDataGenerator$1.run(DemoDataGenerator.java:278)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.sql.SQLIntegrityConstraintViolationException: ORA-02292: integrity constraint (ACTIVITI.ACT_FK_IDL_PROCINST) violated - child record found
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:439)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:395)
at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:802)
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:436)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:186)
at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:521)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:205)
at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:1008)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1307)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3449)
at oracle.jdbc.driver.OraclePreparedStatement.execute(OraclePreparedStatement.java:3550)
at oracle.jdbc.driver.OraclePreparedStatementWrapper.execute(OraclePreparedStatementWrapper.java:1374)
at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172)
at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:41)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:66)
at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:45)
at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:108)
at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:75)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:145)
… 14 more
Exception in thread "Thread-3" org.apache.ibatis.exceptions.PersistenceException:
### Error updating database. Cause: java.sql.SQLIntegrityConstraintViolationException: ORA-02292: integrity constraint (ACTIVITI.ACT_FK_IDL_PROCINST) violated - child record found
### The error may involve org.activiti.engine.impl.persistence.entity.ExecutionEntity.deleteExecution-Inline
### The error occurred while setting parameters
### SQL: delete from ACT_RU_EXECUTION where ID_ = ? and REV_ = ?
### Cause: java.sql.SQLIntegrityConstraintViolationException: ORA-02292: integrity constraint (ACTIVITI.ACT_FK_IDL_PROCINST) violated - child record found
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:23)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:147)
at org.apache.ibatis.session.defaults.DefaultSqlSession.delete(DefaultSqlSession.java:158)
at org.activiti.engine.impl.db.DbSqlSession$DeletePersistentObjectOperation.execute(DbSqlSession.java:237)
at org.activiti.engine.impl.db.DbSqlSession.flushDeletes(DbSqlSession.java:668)
at org.activiti.engine.impl.db.DbSqlSession.flush(DbSqlSession.java:462)
at org.activiti.engine.impl.interceptor.CommandContext.flushSessions(CommandContext.java:168)
at org.activiti.engine.impl.interceptor.CommandContext.close(CommandContext.java:115)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:70)
at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:42)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)
at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:40)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:31)
at org.activiti.engine.impl.TaskServiceImpl.complete(TaskServiceImpl.java:159)
at org.activiti.explorer.demo.DemoDataGenerator$1.run(DemoDataGenerator.java:278)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.sql.SQLIntegrityConstraintViolationException: ORA-02292: integrity constraint (ACTIVITI.ACT_FK_IDL_PROCINST) violated - child record found
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:439)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:395)
at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:802)
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:436)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:186)
at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:521)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:205)
at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:1008)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1307)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3449)
at oracle.jdbc.driver.OraclePreparedStatement.execute(OraclePreparedStatement.java:3550)
at oracle.jdbc.driver.OraclePreparedStatementWrapper.execute(OraclePreparedStatementWrapper.java:1374)
at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172)
at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:41)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:66)
at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:45)
at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:108)
at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:75)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:145)
… 14 more