从 Oracle 10g 迁移到 11g 驱动程序后无法打开连接
Could not open connection after migration from Oracle 10g to 11g driver
我有一个使用 Oracle DB 的应用程序，它使用 c3p0 和 hibernate。
升级到 Hibernate 4 后出现异常
java.lang.AbstractMethodError: Method oracle/jdbc/driver/T4CPreparedStatement.setBinaryStream(ILjava/io/InputStream;J)V is abstract at oracle.jdbc.driver.T4CPreparedStatement.setBinaryStream(T4CPreparedStatement.java)
at oracle.jdbc.driver.T4CPreparedStatement.setBinaryStream(T4CPreparedStatement.java) ~[ojdbc14.jar:Oracle JDBC Driver version - "10.2.0.5.0"]
at sun.reflect.GeneratedMethodAccessor257.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_40]
at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_40]
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.setBinaryStream(NewProxyPreparedStatement.java:2133) ~[c3p0-0.9.2.jar:0.9.2]
at org.hibernate.type.descriptor.sql.BlobTypeDescriptor.doBind(BlobTypeDescriptor.java:147) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.type.descriptor.sql.BlobTypeDescriptor.doBind(BlobTypeDescriptor.java:103) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:90) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:286) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:281) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.type.AbstractSingleColumnStandardBasicType.nullSafeSet(AbstractSingleColumnStandardBasicType.java:56) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:2843) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3121) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3581) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:104) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:465) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:351) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:350) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:56) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1258) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
建议的解决方案是将Oracle 驱动程序从10g 升级到11g。为此，我将 ojdbc14.jar 替换为 ojdbc6.jar（对于调试符号，实际上是 ojdbc6_g.jar）。之后该应用程序不再启动并出现异常
org.hibernate.exception.GenericJDBCException: Could not open connection
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:235) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:171) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:67) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:162) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1471) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106) ~[mchange-commons-java-0.2.3.3.jar:na]
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:677) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:134) ~[c3p0-0.9.2.jar:0.9.2]
at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:139) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:380) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:228) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
... 27 common frames omitted
Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1406) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:594) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:514) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:743) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:670) ~[c3p0-0.9.2.jar:0.9.2]
... 31 common frames omitted
无论是从 c3p0 还是从 Oracle 11g 驱动程序，我都看不到任何东西。
似乎是因为 c3p0 0.9.2 使用的是 log4j 而不是 slf4j，所以在添加 log4j-over-slf4j 之后我可以看到 Oracle 驱动程序抛出异常，c3p0 将其记录为警告（原文如此！）
WARN com.mchange.v2.resourcepool.BasicResourcePool - com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@412960b2 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:
java.sql.SQLException: ORA-00604: error occurred at recursive SQL level 1
ORA-01882: timezone region not found
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:459) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:392) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:384) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIfun.processError(T4CTTIfun.java:767) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIoauthenticate.processError(T4CTTIoauthenticate.java:450) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:539) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:235) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIoauthenticate.doOAUTH(T4CTTIoauthenticate.java:382) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIoauthenticate.doOAUTH(T4CTTIoauthenticate.java:822) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:477) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:564) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:251) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:29) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:563) ~[ojdbc6_g.jar:11.2.0.4.0]
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:183) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:172) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPoolPooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:188) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1074) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1061) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.resourcepool.BasicResourcePool.access0(BasicResourcePool.java:32) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1798) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:636) [mchange-commons-java-0.2.3.3.jar:na]
这个问题可以通过为启动 JRE 的命令提供参数 -Duser.timezone=GMT 来解决。但是问题是为什么我运行 Java 8 就Linux 非要那样做呢？我的时区设置正确：
$ date +'%:z %Z'
+03:00 EEST
为什么我必须额外设置一个变量？
JDBC 11.2 及更高版本在连接到服务器时使用时区名称（通常从 OS 获得）。这样做的原因有很多，主要是为了避免使用与 UTC 的固定偏移量连接时发生的许多 DST 相关问题。
但是，如果数据库不理解时区标识，则会抛出此错误。
有多种方法可以解决这个问题，最可取的方法是将服务器更新到可以识别时区的版本，或者使用可用的最新时区补丁对现有服务器进行修补。
或者，通过在执行前在环境中设置 TZ 或使用 -Duser.timezone=XXXX 在 JVM 中更改它来更改客户端使用的时区。
最后，您还可以使用 -Doracle.jdbc.timezoneAsRegion=false 恢复为在连接上发送固定偏移量。不建议这样做，因为它会重新引入不正确的 DST 相关行为。
客户端似乎一切正常。 TimeZone.getDefault().getID() returns 我 Europe/Helsinki。但是 Oracle DB table V$TIMEZONE_NAMES 不包含 Europe/Helsinki，导致 ORA-01882: timezone region not found 异常。
需要将 DSTv15 Timezone Patches 应用到 DB 以获得 Europe/Helsinki。否则 -Duser.timezone=EET 必须在客户端显式设置以避免此解决方案和以下异常。
我有一个使用 Oracle DB 的应用程序，它使用 c3p0 和 hibernate。 升级到 Hibernate 4 后出现异常
java.lang.AbstractMethodError: Method oracle/jdbc/driver/T4CPreparedStatement.setBinaryStream(ILjava/io/InputStream;J)V is abstract at oracle.jdbc.driver.T4CPreparedStatement.setBinaryStream(T4CPreparedStatement.java)
at oracle.jdbc.driver.T4CPreparedStatement.setBinaryStream(T4CPreparedStatement.java) ~[ojdbc14.jar:Oracle JDBC Driver version - "10.2.0.5.0"]
at sun.reflect.GeneratedMethodAccessor257.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_40]
at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_40]
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.setBinaryStream(NewProxyPreparedStatement.java:2133) ~[c3p0-0.9.2.jar:0.9.2]
at org.hibernate.type.descriptor.sql.BlobTypeDescriptor.doBind(BlobTypeDescriptor.java:147) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.type.descriptor.sql.BlobTypeDescriptor.doBind(BlobTypeDescriptor.java:103) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:90) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:286) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:281) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.type.AbstractSingleColumnStandardBasicType.nullSafeSet(AbstractSingleColumnStandardBasicType.java:56) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:2843) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3121) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3581) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:104) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:465) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:351) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:350) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:56) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1258) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
建议的解决方案是将Oracle 驱动程序从10g 升级到11g。为此，我将 ojdbc14.jar 替换为 ojdbc6.jar（对于调试符号，实际上是 ojdbc6_g.jar）。之后该应用程序不再启动并出现异常
org.hibernate.exception.GenericJDBCException: Could not open connection
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:235) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:171) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:67) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:162) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1471) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106) ~[mchange-commons-java-0.2.3.3.jar:na]
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:677) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:134) ~[c3p0-0.9.2.jar:0.9.2]
at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:139) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:380) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:228) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
... 27 common frames omitted
Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1406) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:594) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:514) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:743) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:670) ~[c3p0-0.9.2.jar:0.9.2]
... 31 common frames omitted
无论是从 c3p0 还是从 Oracle 11g 驱动程序，我都看不到任何东西。 似乎是因为 c3p0 0.9.2 使用的是 log4j 而不是 slf4j，所以在添加 log4j-over-slf4j 之后我可以看到 Oracle 驱动程序抛出异常，c3p0 将其记录为警告（原文如此！）
WARN com.mchange.v2.resourcepool.BasicResourcePool - com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@412960b2 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:
java.sql.SQLException: ORA-00604: error occurred at recursive SQL level 1
ORA-01882: timezone region not found
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:459) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:392) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:384) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIfun.processError(T4CTTIfun.java:767) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIoauthenticate.processError(T4CTTIoauthenticate.java:450) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:539) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:235) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIoauthenticate.doOAUTH(T4CTTIoauthenticate.java:382) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CTTIoauthenticate.doOAUTH(T4CTTIoauthenticate.java:822) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:477) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:564) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:251) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:29) ~[ojdbc6_g.jar:11.2.0.4.0]
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:563) ~[ojdbc6_g.jar:11.2.0.4.0]
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:183) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:172) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPoolPooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:188) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1074) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1061) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.resourcepool.BasicResourcePool.access0(BasicResourcePool.java:32) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1798) ~[c3p0-0.9.2.jar:0.9.2]
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:636) [mchange-commons-java-0.2.3.3.jar:na]
这个问题可以通过为启动 JRE 的命令提供参数 -Duser.timezone=GMT 来解决。但是问题是为什么我运行 Java 8 就Linux 非要那样做呢？我的时区设置正确：
$ date +'%:z %Z'
+03:00 EEST
为什么我必须额外设置一个变量？
JDBC 11.2 及更高版本在连接到服务器时使用时区名称（通常从 OS 获得）。这样做的原因有很多，主要是为了避免使用与 UTC 的固定偏移量连接时发生的许多 DST 相关问题。
但是，如果数据库不理解时区标识，则会抛出此错误。
有多种方法可以解决这个问题，最可取的方法是将服务器更新到可以识别时区的版本，或者使用可用的最新时区补丁对现有服务器进行修补。
或者，通过在执行前在环境中设置 TZ 或使用 -Duser.timezone=XXXX 在 JVM 中更改它来更改客户端使用的时区。
最后，您还可以使用 -Doracle.jdbc.timezoneAsRegion=false 恢复为在连接上发送固定偏移量。不建议这样做，因为它会重新引入不正确的 DST 相关行为。
客户端似乎一切正常。 TimeZone.getDefault().getID() returns 我 Europe/Helsinki。但是 Oracle DB table V$TIMEZONE_NAMES 不包含 Europe/Helsinki，导致 ORA-01882: timezone region not found 异常。
需要将 DSTv15 Timezone Patches 应用到 DB 以获得 Europe/Helsinki。否则 -Duser.timezone=EET 必须在客户端显式设置以避免此解决方案和以下异常。