How to catch SQLException in the hibernate ?

Question

Hi ~ , I am a newbie to java , recently I do a project that need to use hibernate to do insert data into database(db2) , but my program always encounter a DB deadlock problem , which throw an exception indicated that
"{code}DB2 SQL error: SQLCODE: -911, SQLSTATE: 40001, SQLERRMC: 2{code}"
so, in this case , i want to try catch block handle this exception , and the code is as follows:
public static void main(String[] args){
try {
Configuration cfg =
new Configuration().configure();
SessionFactory sf = cfg.buildSessionFactory();
Session session = sf.openSession();
Transaction tx = session.beginTransaction();
try {
session.save(obj1);
session.save(obj2);
tx.commit();
session.close();
}catch (SQLException se) {
// ***** here it indicate an error that "This exception is never thrown from the try statement body" *****
}catch (HibernateException e) {
e.printStackTrace();
}but in fact , while running the programe , it does throw a SQLException that abend the program , how would I not be able to catch it ? , here I provide the error info :
Hibernate: insert into TBCUSRPQ (CUST_NAME, CUST_SALUT, LAST_UPDT_BY, LANG, VER, FNL_RSK_LVL_CDE, SYS_RSK_LVL_CDE, CUS_RSK_LVL_CDE, NO_OF_ANS, ANS_REF_ID, DTL_INFO, BANK_NO, CTRY_CDE, RPQ_GP, CUST_ID_TYPE, CUST_ID_NO, LAST_UPDT_DT, LAST_UPDT_TM) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
Hibernate: insert into TBCUSANS (ANS_LIST, ANS_REF_ID, QUEST_NUM) values (?, ?, ?)
Nov 5, 2008 12:04:17 PM net.sf.hibernate.util.JDBCExceptionReporter logExceptions
WARNING: SQL Error: -911, SQLState: 40001
Nov 5, 2008 12:04:17 PM net.sf.hibernate.util.JDBCExceptionReporter logExceptions
SEVERE: DB2 SQL error: SQLCODE: -911, SQLSTATE: 40001, SQLERRMC: 2
Nov 5, 2008 12:04:17 PM net.sf.hibernate.impl.SessionImpl execute
SEVERE: Could not synchronize database state with session
net.sf.hibernate.exception.GenericJDBCException: could not insert: [com.hsbc.rpq.importer.vo.ris.CustomerAnswer#com.hsbc.rpq.importer.vo.ris.CustomerAnswer@87235980]
at net.sf.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:80)
at net.sf.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:69)
at net.sf.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
at net.sf.hibernate.persister.AbstractEntityPersister.convert(AbstractEntityPersister.java:1331)
at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:472)
at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:436)
at net.sf.hibernate.impl.ScheduledInsertion.execute(ScheduledInsertion.java:37)
at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2449)
at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2435)
at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2392)
at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2261)
at net.sf.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:61)
at com.hsbc.rpq.importer.TestDB.main(TestDB.java:78)
{color:#ff0000}Caused by: com.ibm.db2.jcc.c.SqlException: DB2 SQL error: SQLCODE: -911, SQLSTATE: 40001, SQLERRMC: 2{color}
at com.ibm.db2.jcc.c.fg.e(fg.java:1596)
at com.ibm.db2.jcc.b.gb.o(gb.java:727)
at com.ibm.db2.jcc.b.gb.g(gb.java:143)
at com.ibm.db2.jcc.b.gb.a(gb.java:39)
at com.ibm.db2.jcc.b.w.a(w.java:34)
at com.ibm.db2.jcc.b.vb.g(vb.java:139)
at com.ibm.db2.jcc.c.fg.n(fg.java:1177)
at com.ibm.db2.jcc.c.gg.eb(gg.java:1862)
at com.ibm.db2.jcc.c.gg.d(gg.java:2295)
at com.ibm.db2.jcc.c.gg.W(gg.java:457)
at com.ibm.db2.jcc.c.gg.executeUpdate(gg.java:440)
at net.sf.hibernate.impl.NonBatchingBatcher.addToBatch(NonBatchingBatcher.java:22)
at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:462)
... 8 moreI tried a lot , but couldn't solve the problem, could anyone help me , how to catch a SQLExcepion in this case , thanks in advance !!

Answer 1

Hi,
as corlettk said, you may only catch exceptions that are thrown at you directly (at least for checked exceptions...). If you really want to handle this specific error situation in any reasonable way, there is the possibility to catch what is thrown at you and inspect the cause of the exception provided.
try {
    // some hibernate calls
} catch (GenericJdbcException ge) {
    if(ge.getCause() != null && ge.getCause() instanceof SQLException) {
        SQLException se = (SQLException)ge.getCause();
        if(se.getErrorCode() == -911) {
            // your error handling for this case
        }else{
            throw ge; // do not swallow unhandled exceptions
    }else{
        throw ge // do not swallow unhandled exceptions
}But such things quickly get quite ugly, e.g. if the SQLException is not the direct cause of the GenericJdbcException...so you should be aware what you are doing.
Bye.