我有一个用于更新嵌入式Derby表的方法。该方法在第一次在新数据库上运行时工作正常（即。我删除文件库，Derby在创建表时重新创建）。
在后续执行时，它总是因LockAcquisitionException而失败。
有人可以看看这种方法，看看我做错了什么吗？我已经查看了其他消息：LockAcquisitionException但似乎没什么关系。
private boolean updateTlnDb(Connection connection, ArrayList<TLNDetail> tlnDetails) {
logger.info("In updateTlnDb.");
DateFormat etrDateFormat = new SimpleDateFormat("MM/dd/yyyy HH:mm");
DateFormat crtDateFormat = new SimpleDateFormat("MM/dd/yyy HH:mm:SS");
PersistentTransaction t = null;
Date etrDate = null;
Date crtDate = null;
// Get our transaction instance
try {
t = app.DerbyTLNPersistentManager.instance().getSession().beginTransaction();
} catch (PersistentException e) {
logger.error("Could not begin transaction.");
e.printStackTrace();
return false; // Without the transaction, we can't continue.
}
app.DAOFactory tlnDaoFactory = app.DAOFactory.getDAOFactory();
TLNDAO tlndao = tlnDaoFactory.getTLNDAO();
Collections.sort(tlnDetails, TLNDetail.TLNDetailUpdateIdentifierComparator);
// Placeholder
for(TLNDetail tlnDetail: tlnDetails){
try {
etrDate = etrDateFormat.parse(tlnDetail.getEtr_dttm());
crtDate = crtDateFormat.parse(tlnDetail.getTckt_crte_dttm());
} catch (ParseException e) {
// Can't proceed without the dates.
logger.error(e.getMessage());
return false;
}
try {
if(tlnDetail.getUpdate_identifier().equalsIgnoreCase("A")) {
app.TLNCriteria tlnCriteria = new TLNCriteria();
tlnCriteria.txCoordinate.eq(tlnDetail.getTX_coordinate());
app.TLN tln = tlndao.loadTLNByCriteria(tlnCriteria);
if(tln==null) {
logger.info("Adding " + tlnDetail.getTX_coordinate());
app.TLN newTln = tlndao.createTLN();
newTln.setTxCoordinate(tlnDetail.getTX_coordinate());
newTln.setEtr(new Timestamp(etrDate.getTime()));
newTln.setXdate(new Timestamp(crtDate.getTime()));
newTln.setBatchkey1("new");
tlndao.save(newTln);
}
} else if(tlnDetail.getUpdate_identifier().equalsIgnoreCase("C")) {
app.TLNCriteria tlnCriteria = new TLNCriteria();
tlnCriteria.txCoordinate.eq(tlnDetail.getTX_coordinate());
app.TLN tln = tlndao.loadTLNByCriteria(tlnCriteria);
if(tln!=null) {
logger.info("Changing " + tlnDetail.getTX_coordinate());
tln.setXdate(new Timestamp(crtDate.getTime()));
tln.setEtr(new Timestamp(etrDate.getTime()));
tlndao.save(tln);
}
} else if(tlnDetail.getUpdate_identifier().equalsIgnoreCase("D")) {
app.TLNCriteria tlnCriteria = new TLNCriteria();
tlnCriteria.txCoordinate.eq(tlnDetail.getTX_coordinate());
app.TLN tln = tlndao.loadTLNByCriteria(tlnCriteria);
if(tln!=null) {
logger.info("Deleting " + tlnDetail.getTX_coordinate());
tlndao.delete(tln);
tlndao.save(tln);
}
}
} catch (PersistentException e) {
e.printStackTrace();
} catch (LockAcquisitionException e) {
logger.error(e.getMessage());
return false;
}
}
try {
t.commit();
} catch (PersistentException e) {
e.printStackTrace();
}
return false;
}
以及运行输出......
2014-07-08 22:25:46 INFO UpdateNG:176 - In doIt()
2014-07-08 22:25:46 INFO UpdateNG:675 - In parseOptions.
2014-07-08 22:25:46 INFO UpdateNG:707 - In setupCutover.
2014-07-08 22:25:47 INFO UpdateNG:549 - In loadDriver.
2014-07-08 22:25:47 INFO UpdateNG:552 - In loadDriver
2014-07-08 22:25:47 INFO UpdateNG:556 - Loaded the appropriate driver
2014-07-08 22:25:47 INFO UpdateNG:458 - In createConnection.
2014-07-08 22:25:48 INFO UpdateNG:425 - In createDatabase.
2014-07-08 22:25:48 INFO UpdateNG:623 - In parseTlnFiles.
2014-07-08 22:25:48 INFO UpdateNG:632 - Opened /export/tfcc/sftpusers/fplsftp/home/fplsftp/fplput/TLN.20140529105428
2014-07-08 22:25:48 ERROR UpdateNG:642 - Could not parse: 'HTimestamp05/29/2014 10:53 '
2014-07-08 22:25:48 ERROR UpdateNG:643 - Bad etr type.
2014-07-08 22:25:48 INFO UpdateNG:655 - TLN records parsed: 6
2014-07-08 22:25:48 INFO UpdateNG:585 - In moveTlnFiles.
2014-07-08 22:25:48 INFO UpdateNG:317 - In updateTlnDb.
2014-07-08 22:25:48 INFO Version:37 - HCANN000001: Hibernate Commons Annotations {4.0.2.Final}
2014-07-08 22:25:48 INFO Version:41 - HHH000412: Hibernate Core {[WORKING]}
2014-07-08 22:25:48 INFO Environment:224 - HHH000205: Loaded properties from resource hibernate.properties: {hibernate.max_fetch_depth=1, hibernate.jdbc.use_streams_for_binary=true, hibernate.format_sql=true, hibernate.cache.region.factory_class=org.hibernate.cache.internal.NoCachingRegionFactory, hibernate.query.substitutions=yes 'Y', no 'N', hibernate.proxool.pool_alias=pool1, hibernate.cache.region_prefix=hibernate.test, hibernate.bytecode.use_reflection_optimizer=false, hibernate.jdbc.batch_versioned_data=true, hibernate.connection.pool_size=1}
2014-07-08 22:25:48 INFO Environment:253 - HHH000407: Using java.io streams to persist binary types
2014-07-08 22:25:48 INFO Environment:342 - HHH000021: Bytecode provider name : javassist
2014-07-08 22:25:48 INFO Configuration:2006 - HHH000043: Configuring from resource: /ormmapping/DerbyTLN.cfg.xml
2014-07-08 22:25:48 INFO Configuration:2025 - HHH000040: Configuration resource: /ormmapping/DerbyTLN.cfg.xml
2014-07-08 22:25:48 INFO Configuration:728 - HHH000221: Reading mappings from resource: ormmapping/app/TLN.hbm.xml
2014-07-08 22:25:48 INFO Configuration:2147 - HHH000041: Configured SessionFactory: null
2014-07-08 22:25:48 INFO Dialect:130 - HHH000400: Using dialect: org.hibernate.dialect.DerbyDialect
2014-07-08 22:25:48 WARN DerbyDialect:60 - HHH000430: The DerbyDialect dialect has been deprecated; use one of the version-specific dialects instead
2014-07-08 22:25:49 WARN ConnectionProviderInitiator:222 - HHH000209: proxool properties were encountered, but the org.hibernate.service.jdbc.connections.internal.ProxoolConnectionProvider provider class was not found on the classpath; these properties are going to be ignored.
2014-07-08 22:25:49 INFO DriverManagerConnectionProviderImpl:98 - HHH000402: Using Hibernate built-in connection pool (not for production use!)
2014-07-08 22:25:49 INFO DriverManagerConnectionProviderImpl:134 - HHH000115: Hibernate connection pool size: 1
2014-07-08 22:25:49 INFO DriverManagerConnectionProviderImpl:137 - HHH000006: Autocommit mode: false
2014-07-08 22:25:49 INFO DriverManagerConnectionProviderImpl:151 - HHH000401: using driver [org.apache.derby.jdbc.EmbeddedDriver] at URL [jdbc:derby:/fpl-derby/tlnDb/;create=true]
2014-07-08 22:25:49 INFO DriverManagerConnectionProviderImpl:156 - HHH000046: Connection properties: {user=sa, password=****}
2014-07-08 22:25:49 INFO Dialect:130 - HHH000400: Using dialect: org.hibernate.dialect.DerbyDialect
2014-07-08 22:25:49 WARN DerbyDialect:60 - HHH000430: The DerbyDialect dialect has been deprecated; use one of the version-specific dialects instead
2014-07-08 22:25:49 INFO TransactionFactoryInitiator:68 - HHH000399: Using default transaction strategy (direct JDBC transactions)
2014-07-08 22:25:49 INFO ASTQueryTranslatorFactory:48 - HHH000397: Using ASTQueryTranslatorFactory
2014-07-08 22:26:49 WARN SqlExceptionHelper:145 - SQL Error: 30000, SQLState: 40XL1
2014-07-08 22:26:49 ERROR SqlExceptionHelper:147 - A lock could not be obtained within the time requested
2014-07-08 22:26:49 ERROR UpdateNG:403 - could not prepare statement
2014-07-08 22:26:49 INFO UpdateNG:507 - In unloadDriver
2014-07-08 22:26:49 INFO UpdateNG:523 - Derby shut down normally
这是一个锁定跟踪...
XID |TYPE |MODE|LOCKCOUNT|LOCKNAME |STATE|TABLETYPE / LOCKOBJ |INDEXNAME / CONTAINER_ID / (MODE for LATCH only) |TABLENAME / CONGLOM_ID |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
*** The following row is the victim ***
754 |ROW |S |0 |(1,30) |WAIT |S |NULL |SYSTABLES |
*** The above row is the victim ***
747 |TABLE |X |1 |Tablelock |GRANT|T |NULL |*** TRANSIENT_1200 |
747 |TABLE |IX |3 |Tablelock |GRANT|S |NULL |SYSTABLES |
754 |TABLE |IS |2 |Tablelock |GRANT|S |NULL |SYSTABLES |
747 |ROW |X |1 |(1,30) |GRANT|S |NULL |SYSTABLES |
747 |ROW |S |2 |(1,17) |GRANT|S |NULL |SYSSCHEMAS |
754 |ROW |S |2 |(1,17) |GRANT|S |NULL |SYSSCHEMAS |
747 |ROW |X |3 |(9,8) |GRANT|S |NULL |SYSTABLES |
747 |TABLE |IS |2 |Tablelock |GRANT|S |NULL |SYSSCHEMAS |
754 |TABLE |IS |2 |Tablelock |GRANT|S |NULL |SYSSCHEMAS |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
有趣的是，如果我打开行级锁定，应用程序就不会挂起。
答案 0 :(得分：2)
在您的锁定调试中，您似乎在SYSTABLES上发生冲突。中止的tx等待行锁，但是另一个tx在表上持有表锁。如果您还启用了已执行语句的记录（derby.language.logStatementText） - 您应该能够看到导致此冲突的操作。