Java 由容器（CMT）管理的多个EntityManager

我有以下情况：我的应用程序需要动态连接到多个数据库，所以经过大量搜索后，我认为最好的选择是创建多个EntityManager，并在运行时决定使用哪一个

代码如下：

public class GenericDao {

    @PersistenceContext(unitName = "db1")
    protected EntityManager em1;

    @PersistenceContext(unitName = "db2")
    protected EntityManager em2;

    @PersistenceContext(unitName = "db3")
    protected EntityManager em3;

}

通过这种方式，我可以连接到所有数据库，并且仍然让容器管理我的事务

问题是，当其中一个连接失败时，我的应用程序在这种情况下甚至不会部署，并且会出现以下异常：

[#|2014-09-19T10:04:41.006-0300|SEVERE|glassfish3.1.2|org.eclipse.persistence.session.file:/usr/local/glassfish-3.1.2.2/glassfish/domains/domain2/applications/teste/WEB-INF/classes/_db1.ejb|_ThreadID=104;_ThreadName=Thread-2;|Local Exception Stack: 
Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.1.v20121003-ad44345): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: The connection attempt failed.
Error Code: 0
    at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:309)
    at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:135)
    at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:685)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:215)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:542)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:186)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:278)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:304)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:282)
    at org.glassfish.persistence.jpa.PersistenceUnitLoader.loadPU(PersistenceUnitLoader.java:211)
    at org.glassfish.persistence.jpa.PersistenceUnitLoader.<init>(PersistenceUnitLoader.java:120)
    at org.glassfish.persistence.jpa.JPADeployer$1.visitPUD(JPADeployer.java:224)
    at org.glassfish.persistence.jpa.JPADeployer$PersistenceUnitDescriptorIterator.iteratePUDs(JPADeployer.java:495)
    at org.glassfish.persistence.jpa.JPADeployer.createEMFs(JPADeployer.java:233)
    at org.glassfish.persistence.jpa.JPADeployer.prepare(JPADeployer.java:168)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.prepareModule(ApplicationLifecycle.java:871)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:410)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:240)
    at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:389)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:348)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:363)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1085)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1200(CommandRunnerImpl.java:95)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1291)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1259)
    at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:461)
    at com.sun.enterprise.v3.admin.AdminAdapter.service(AdminAdapter.java:212)
    at com.sun.grizzly.tcp.http11.GrizzlyAdapter.service(GrizzlyAdapter.java:179)
    at com.sun.enterprise.v3.server.HK2Dispatcher.dispath(HK2Dispatcher.java:117)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$Hk2DispatcherCallable.call(ContainerMapper.java:354)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: The connection attempt failed.
    at com.sun.gjc.spi.base.DataSource.getConnection(DataSource.java:120)
    at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:123)
    ... 44 more
Caused by: javax.resource.spi.ResourceAllocationException: Error in allocating a connection. Cause: Connection could not be allocated because: The connection attempt failed.
    at com.sun.enterprise.connectors.ConnectionManagerImpl.internalGetConnection(ConnectionManagerImpl.java:307)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:190)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:165)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:160)
    at com.sun.gjc.spi.base.DataSource.getConnection(DataSource.java:113)
    ... 45 more
Caused by: com.sun.appserv.connectors.internal.api.PoolingException: Connection could not be allocated because: The connection attempt failed.
    at com.sun.enterprise.resource.pool.datastructure.RWLockDataStructure.addResource(RWLockDataStructure.java:103)
    at com.sun.enterprise.resource.pool.ConnectionPool.addResource(ConnectionPool.java:282)
    at com.sun.enterprise.resource.pool.ConnectionPool.createResourceAndAddToPool(ConnectionPool.java:1512)
    at com.sun.enterprise.resource.pool.ConnectionPool.createResources(ConnectionPool.java:944)
    at com.sun.enterprise.resource.pool.ConnectionPool.initPool(ConnectionPool.java:230)
    at com.sun.enterprise.resource.pool.ConnectionPool.internalGetResource(ConnectionPool.java:511)
    at com.sun.enterprise.resource.pool.ConnectionPool.getResource(ConnectionPool.java:381)
    at com.sun.enterprise.resource.pool.PoolManagerImpl.getResourceFromPool(PoolManagerImpl.java:245)
    at com.sun.enterprise.resource.pool.PoolManagerImpl.getResource(PoolManagerImpl.java:170)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.getResource(ConnectionManagerImpl.java:338)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.internalGetConnection(ConnectionManagerImpl.java:301)
    ... 49 more
Caused by: com.sun.appserv.connectors.internal.api.PoolingException: Connection could not be allocated because: The connection attempt failed.
    at com.sun.enterprise.resource.pool.ConnectionPool.createSingleResource(ConnectionPool.java:924)
    at com.sun.enterprise.resource.pool.ConnectionPool.createResource(ConnectionPool.java:1189)
    at com.sun.enterprise.resource.pool.datastructure.RWLockDataStructure.addResource(RWLockDataStructure.java:98)
    ... 59 more
Caused by: com.sun.appserv.connectors.internal.api.PoolingException: Connection could not be allocated because: The connection attempt failed.
    at com.sun.enterprise.resource.allocator.LocalTxConnectorAllocator.createResource(LocalTxConnectorAllocator.java:110)
    at com.sun.enterprise.resource.pool.ConnectionPool.createSingleResource(ConnectionPool.java:907)
    ... 61 more
Caused by: javax.resource.spi.ResourceAllocationException: Connection could not be allocated because: The connection attempt failed.
    at com.sun.gjc.spi.DSManagedConnectionFactory.createManagedConnection(DSManagedConnectionFactory.java:129)
    at com.sun.enterprise.resource.allocator.LocalTxConnectorAllocator.createResource(LocalTxConnectorAllocator.java:87)
    ... 62 more
Caused by: org.postgresql.util.PSQLException: The connection attempt failed.
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:225)
    at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:64)
    at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:136)
    at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:29)
    at org.postgresql.jdbc3g.AbstractJdbc3gConnection.<init>(AbstractJdbc3gConnection.java:21)
    at org.postgresql.jdbc4.AbstractJdbc4Connection.<init>(AbstractJdbc4Connection.java:31)
    at org.postgresql.jdbc4.Jdbc4Connection.<init>(Jdbc4Connection.java:24)
    at org.postgresql.Driver.makeConnection(Driver.java:397)
    at org.postgresql.Driver.connect(Driver.java:267)
    at java.sql.DriverManager.getConnection(DriverManager.java:571)
    at java.sql.DriverManager.getConnection(DriverManager.java:215)
    at org.postgresql.ds.common.BaseDataSource.getConnection(BaseDataSource.java:97)
    at org.postgresql.ds.common.BaseDataSource.getConnection(BaseDataSource.java:80)
    at com.sun.gjc.spi.DSManagedConnectionFactory.createManagedConnection(DSManagedConnectionFactory.java:115)
    ... 63 more
Caused by: java.net.UnknownHostException: 192.168.1.1a
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:579)
    at java.net.Socket.connect(Socket.java:528)
    at org.postgresql.core.PGStream.<init>(PGStream.java:60)
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:101)
    ... 76 more
|#]

[#|2014-09-19T10:04:41.007-0300|SEVERE|glassfish3.1.2|javax.enterprise.system.core.com.sun.enterprise.v3.server|_ThreadID=104;_ThreadName=Thread-2;|Exception while invoking class org.glassfish.persistence.jpa.JPADeployer prepare method|#]

[#|2014-09-19T10:04:41.007-0300|SEVERE|glassfish3.1.2|javax.enterprise.system.core.com.sun.enterprise.v3.server|_ThreadID=104;_ThreadName=Thread-2;|Exception while preparing the app|#]

[#|2014-09-19T10:04:41.008-0300|SEVERE|glassfish3.1.2|javax.enterprise.system.core.com.sun.enterprise.v3.server|_ThreadID=104;_ThreadName=Thread-2;|Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.1.v20121003-ad44345): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: The connection attempt failed.
Error Code: 0
javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.1.v20121003-ad44345): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: The connection attempt failed.
Error Code: 0
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:602)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:186)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:278)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:304)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:282)
    at org.glassfish.persistence.jpa.PersistenceUnitLoader.loadPU(PersistenceUnitLoader.java:211)
    at org.glassfish.persistence.jpa.PersistenceUnitLoader.<init>(PersistenceUnitLoader.java:120)
    at org.glassfish.persistence.jpa.JPADeployer$1.visitPUD(JPADeployer.java:224)
    at org.glassfish.persistence.jpa.JPADeployer$PersistenceUnitDescriptorIterator.iteratePUDs(JPADeployer.java:495)
    at org.glassfish.persistence.jpa.JPADeployer.createEMFs(JPADeployer.java:233)
    at org.glassfish.persistence.jpa.JPADeployer.prepare(JPADeployer.java:168)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.prepareModule(ApplicationLifecycle.java:871)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:410)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:240)
    at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:389)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:348)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:363)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1085)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1200(CommandRunnerImpl.java:95)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1291)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1259)
    at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:461)
    at com.sun.enterprise.v3.admin.AdminAdapter.service(AdminAdapter.java:212)
    at com.sun.grizzly.tcp.http11.GrizzlyAdapter.service(GrizzlyAdapter.java:179)
    at com.sun.enterprise.v3.server.HK2Dispatcher.dispath(HK2Dispatcher.java:117)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$Hk2DispatcherCallable.call(ContainerMapper.java:354)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:745)
Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.1.v20121003-ad44345): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: The connection attempt failed.
Error Code: 0
    at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:309)
    at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:135)
    at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:685)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:215)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:542)
    ... 40 more
Caused by: java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: The connection attempt failed.
    at com.sun.gjc.spi.base.DataSource.getConnection(DataSource.java:120)
    at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:123)
    ... 44 more
Caused by: javax.resource.spi.ResourceAllocationException: Error in allocating a connection. Cause: Connection could not be allocated because: The connection attempt failed.
    at com.sun.enterprise.connectors.ConnectionManagerImpl.internalGetConnection(ConnectionManagerImpl.java:307)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:190)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:165)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:160)
    at com.sun.gjc.spi.base.DataSource.getConnection(DataSource.java:113)
    ... 45 more
Caused by: com.sun.appserv.connectors.internal.api.PoolingException: Connection could not be allocated because: The connection attempt failed.
    at com.sun.enterprise.resource.pool.datastructure.RWLockDataStructure.addResource(RWLockDataStructure.java:103)
    at com.sun.enterprise.resource.pool.ConnectionPool.addResource(ConnectionPool.java:282)
    at com.sun.enterprise.resource.pool.ConnectionPool.createResourceAndAddToPool(ConnectionPool.java:1512)
    at com.sun.enterprise.resource.pool.ConnectionPool.createResources(ConnectionPool.java:944)
    at com.sun.enterprise.resource.pool.ConnectionPool.initPool(ConnectionPool.java:230)
    at com.sun.enterprise.resource.pool.ConnectionPool.internalGetResource(ConnectionPool.java:511)
    at com.sun.enterprise.resource.pool.ConnectionPool.getResource(ConnectionPool.java:381)
    at com.sun.enterprise.resource.pool.PoolManagerImpl.getResourceFromPool(PoolManagerImpl.java:245)
    at com.sun.enterprise.resource.pool.PoolManagerImpl.getResource(PoolManagerImpl.java:170)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.getResource(ConnectionManagerImpl.java:338)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.internalGetConnection(ConnectionManagerImpl.java:301)
    ... 49 more
Caused by: com.sun.appserv.connectors.internal.api.PoolingException: Connection could not be allocated because: The connection attempt failed.
    at com.sun.enterprise.resource.pool.ConnectionPool.createSingleResource(ConnectionPool.java:924)
    at com.sun.enterprise.resource.pool.ConnectionPool.createResource(ConnectionPool.java:1189)
    at com.sun.enterprise.resource.pool.datastructure.RWLockDataStructure.addResource(RWLockDataStructure.java:98)
    ... 59 more
Caused by: com.sun.appserv.connectors.internal.api.PoolingException: Connection could not be allocated because: The connection attempt failed.
    at com.sun.enterprise.resource.allocator.LocalTxConnectorAllocator.createResource(LocalTxConnectorAllocator.java:110)
    at com.sun.enterprise.resource.pool.ConnectionPool.createSingleResource(ConnectionPool.java:907)
    ... 61 more
Caused by: javax.resource.spi.ResourceAllocationException: Connection could not be allocated because: The connection attempt failed.
    at com.sun.gjc.spi.DSManagedConnectionFactory.createManagedConnection(DSManagedConnectionFactory.java:129)
    at com.sun.enterprise.resource.allocator.LocalTxConnectorAllocator.createResource(LocalTxConnectorAllocator.java:87)
    ... 62 more
Caused by: org.postgresql.util.PSQLException: The connection attempt failed.
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:225)
    at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:64)
    at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:136)
    at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:29)
    at org.postgresql.jdbc3g.AbstractJdbc3gConnection.<init>(AbstractJdbc3gConnection.java:21)
    at org.postgresql.jdbc4.AbstractJdbc4Connection.<init>(AbstractJdbc4Connection.java:31)
    at org.postgresql.jdbc4.Jdbc4Connection.<init>(Jdbc4Connection.java:24)
    at org.postgresql.Driver.makeConnection(Driver.java:397)
    at org.postgresql.Driver.connect(Driver.java:267)
    at java.sql.DriverManager.getConnection(DriverManager.java:571)
    at java.sql.DriverManager.getConnection(DriverManager.java:215)
    at org.postgresql.ds.common.BaseDataSource.getConnection(BaseDataSource.java:97)
    at org.postgresql.ds.common.BaseDataSource.getConnection(BaseDataSource.java:80)
    at com.sun.gjc.spi.DSManagedConnectionFactory.createManagedConnection(DSManagedConnectionFactory.java:115)
    ... 63 more
Caused by: java.net.UnknownHostException: 192.168.1.1a
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:579)
    at java.net.Socket.connect(Socket.java:528)
    at org.postgresql.core.PGStream.<init>(PGStream.java:60)
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:101)
    ... 76 more
|#]

[#| 2014-09-19T10:04:41.006-0300 | SEVERE | glassfish 3.1.2 | org.eclipse.persistence.session.file:/usr/local/glassfish-3.1.2.2/glassfish/domains/domain2/applications/teste/WEB-INF/classes/_db1.ejb | u ThreadID=104；| u ThreadName=Thread-2；|本地异常堆栈：
异常[EclipseLink-4002]（Eclipse持久性服务-2.4.1.v20121003-ad44345）：org.Eclipse.Persistence.exceptions.DatabaseException
内部异常：java.sql.SQLException:分配连接时出错。原因：无法分配连接，因为：连接尝试失败。
错误代码：0
位于org.eclipse.persistence.exceptions.DatabaseException.sqlException（DatabaseException.java:309）
位于org.eclipse.persistence.sessions.JNDIConnector.connect（JNDIConnector.java:135）
位于org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource（DatasourceLogin.java:162）
位于org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginandetectdatasource（DatabaseSessionImpl.java:685）
位于org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login（EntityManagerFactoryProvider.java:215）
位于org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy（EntityManagerSetupImpl.java:542）
位于org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession（EntityManagerFactoryDelegate.java:186）
位于org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl（EntityManagerFactoryDelegate.java:278）
位于org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl（EntityManagerFactoryImpl.java:304）
位于org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager（EntityManagerFactoryImpl.java:282）
位于org.glassfish.persistence.jpa.PersistenceUnitLoader.loadPU（PersistenceUnitLoader.java:211）
位于org.glassfish.persistence.jpa.PersistenceUnitLoader（PersistenceUnitLoader.java:120）
位于org.glassfish.persistence.jpa.JPADeployer$1.visitPUD（JPADeployer.java:224）
位于org.glassfish.persistence.jpa.JPADeployer$PersistenceUnitDescriptorIterator.iteratePUDs（JPADeployer.java:495）
位于org.glassfish.persistence.jpa.JPADeployer.createEMFs（JPADeployer.java:233）
位于org.glassfish.persistence.jpa.JPADeployer.prepare（JPADeployer.java:168）
在com.sun.enterprise.v3.server.ApplicationLifecycle.prepareModule（ApplicationLifecycle.java:871）上
位于com.sun.enterprise.v3.server.ApplicationLifecycle.deploy（ApplicationLifecycle.java:410）
位于com.sun.enterprise.v3.server.ApplicationLifecycle.deploy（ApplicationLifecycle.java:240）
位于org.glassfish.deployment.admin.DeployCommand.execute（DeployCommand.java:389）
位于com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute（CommandRunnerImpl.java:348）
位于com.sun.enterprise.v3.admin.CommandRunnerImpl.docomand（CommandRunnerImpl.java:363）
位于com.sun.enterprise.v3.admin.CommandRunnerImpl.docomand（CommandRunnerImpl.java:1085）
com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1200（CommandRunnerImpl.java:95）
位于com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute（CommandRunnerImpl.java:1291）
位于com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute（CommandRunnerImpl.java:1259）
位于com.sun.enterprise.v3.admin.AdminAdapter.docomand（adminapter.java:461）
在com.sun.enterprise.v3.admin.adminapter.service（adminapter.java:212）上
位于com.sun.grizzly.tcp.http11.GrizzlyAdapter.service（GrizzlyAdapter.java:179）
位于com.sun.enterprise.v3.server.HK2Dispatcher.dispatcher（HK2Dispatcher.java:117）
com.sun.enterprise.v3.services.impl.ContainerMapper$Hk2DispatcherCallable.call（ContainerMapper.java:354）
位于com.sun.enterprise.v3.services.impl.ContainerMapper.service（ContainerMapper.java:195）
位于com.sun.grizzly.http.ProcessorTask.InvokeApter（ProcessorTask.java:860）
在com.sun.grizzly.http.ProcessorTask.doProcess（ProcessorTask.java:757）
位于com.sun.grizzly.http.ProcessorTask.process（ProcessorTask.java:1056）
位于com.sun.grizzly.http.DefaultProtocolFilter.execute（DefaultProtocolFilter.java:229）
位于com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter（DefaultProtocolChain.java:137）
在com.sun.grizzly.DefaultProtocolChain.execute（DefaultProtocolChain.java:104）上
在com.sun.grizzly.DefaultProtocolChain.execute（DefaultProtocolChain.java:90）上
http.HttpProtocolChain.execute（HttpProtocolChain.java:79）
位于com.sun.grizzly.ProtocolChainContextTask.doCall（ProtocolChainContextTask.java:54）
在com.sun.grizzly.SelectionKeyContextTask.call上（SelectionKeyContextTask.java:59）
位于com.sun.grizzly.ContextTask.run（ContextTask.java:71）
位于com.sun.grizzly.util.AbstractThreadPool$Worker.doWork（AbstractThreadPool.java:532）
位于com.sun.grizzly.util.AbstractThreadPool$Worker.run（AbstractThreadPool.java:513）
运行（Thread.java:745）
原因：java.sql.SQLException:分配连接时出错。原因：无法分配连接，因为：连接尝试失败。
位于com.sun.gjc.spi.base.DataSource.getConnection（DataSource.java:120）
位于org.eclipse.persistence.sessions.JNDIConnector.connect（JNDIConnector.java:123）
…还有44个
原因：javax.resource.spi.ResourceAllocationException:分配连接时出错。原因：无法分配连接，因为：连接尝试失败。
位于com.sun.enterprise.connectors.ConnectionManagerImpl.in