jdbc连接DB2数据库超时的问题
今天接到用户的一个问题，业务厂商的应用程序无法连接某台DB2数据库。和厂商的人沟通了之后，让他把连接报错的信息发过来看看，如下：
错误连接数据库 [EEE] : org.pentaho.di.core.exception.KettleDatabaseException:
Error occured while trying to connect to the database
Error connecting to database: (using class com.ibm.db2.jcc.DB2Driver)
[jcc][t4][2043][11550][3.50.152] 异常 java.net.ConnectException：打开端口 52,000 上服务器 /172.168.23.36 的套接字时出错，消息为：Connection timed out: connect。 ERRORCODE=-4499, SQLSTATE=08001
org.pentaho.di.core.exception.KettleDatabaseException:
Error occured while trying to connect to the database
Error connecting to database: (using class com.ibm.db2.jcc.DB2Driver)
[jcc][t4][2043][11550][3.50.152] 异常 java.net.ConnectException：打开端口 52,000 上服务器 /172.168.23.36 的套接字时出错，消息为：Connection timed out: connect。 ERRORCODE=-4499, SQLSTATE=08001
at org.pentaho.di.core.database.Database.normalConnect(Database.java:312)
at org.pentaho.di.core.database.Database.connect(Database.java:261)
at org.pentaho.di.core.database.Database.connect(Database.java:223)
at org.pentaho.di.core.database.Database.connect(Database.java:213)
at org.pentaho.di.core.database.DatabaseFactory.getConnectionTestReport(DatabaseFactory.java:55)
at org.pentaho.di.core.database.DatabaseMeta.testConnection(DatabaseMeta.java:2409)
at org.pentaho.ui.database.event.DataHandler.testDatabaseConnection(DataHandler.java:487)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.pentaho.ui.xul.impl.AbstractXulDomContainer.invoke(AbstractXulDomContainer.java:294)
at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:124)
at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:112)
at org.pentaho.ui.xul.swt.tags.SwtButton.access$000(SwtButton.java:17)
at org.pentaho.ui.xul.swt.tags.SwtButton$1.widgetSelected(SwtButton.java:77)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:820)
at org.eclipse.jface.window.Window.open(Window.java:796)
at org.pentaho.ui.xul.swt.tags.SwtDialog.show(SwtDialog.java:238)
at org.pentaho.di.ui.core.database.dialog.XulDatabaseDialog.open(XulDatabaseDialog.java:161)
at org.pentaho.di.ui.spoon.delegates.SpoonDBDelegate.editConnection(SpoonDBDelegate.java:79)
at org.pentaho.di.ui.spoon.Spoon.doubleClickedInTree(Spoon.java:2317)
at org.pentaho.di.ui.spoon.Spoon.access$1600(Spoon.java:242)
at org.pentaho.di.ui.spoon.Spoon$25.widgetDefaultSelected(Spoon.java:4061)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at org.pentaho.di.ui.trans.steps.tableinput.TableInputDialog.open(TableInputDialog.java:378)
at org.pentaho.di.ui.spoon.delegates.SpoonStepsDelegate.editStep(SpoonStepsDelegate.java:123)
at org.pentaho.di.ui.spoon.Spoon.editStep(Spoon.java:6274)
at org.pentaho.di.ui.spoon.trans.TransGraph.editStep(TransGraph.java:2296)
at org.pentaho.di.ui.spoon.trans.TransGraph.access$100(TransGraph.java:150)
at org.pentaho.di.ui.spoon.trans.TransGraph$6.mouseDoubleClick(TransGraph.java:454)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at org.pentaho.di.ui.job.entries.sql.JobEntrySQLDialog.open(JobEntrySQLDialog.java:414)
at org.pentaho.di.ui.spoon.delegates.SpoonJobDelegate.editJobEntry(SpoonJobDelegate.java:262)
at org.pentaho.di.ui.spoon.Spoon.editJobEntry(Spoon.java:6169)
at org.pentaho.di.ui.spoon.job.JobGraph.editEntry(JobGraph.java:2148)
at org.pentaho.di.ui.spoon.job.JobGraph$6.mouseDoubleClick(JobGraph.java:381)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at org.pentaho.di.ui.spoon.Spoon.readAndDispatch(Spoon.java:945)
at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:5574)
at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:412)
Caused by: org.pentaho.di.core.exception.KettleDatabaseException:
Error connecting to database: (using class com.ibm.db2.jcc.DB2Driver)
[jcc][t4][2043][11550][3.50.152] 异常 java.net.ConnectException：打开端口 52,000 上服务器 /172.168.23.36 的套接字时出错，消息为：Connection timed out: connect。 ERRORCODE=-4499, SQLSTATE=08001
at org.pentaho.di.core.database.Database.connectUsingClass(Database.java:435)
at org.pentaho.di.core.database.Database.normalConnect(Database.java:296)
... 57 more
Caused by: com.ibm.db2.jcc.b.gm: [jcc][t4][2043][11550][3.50.152] 异常 java.net.ConnectException：打开端口 52,000 上服务器 /172.168.23.36 的套接字时出错，消息为：Connection timed out: connect。 ERRORCODE=-4499, SQLSTATE=08001
at com.ibm.db2.jcc.b.wc.a(wc.java:283)
at com.ibm.db2.jcc.t4.xb.a(xb.java:354)
at com.ibm.db2.jcc.t4.xb.<init>(xb.java:73)
at com.ibm.db2.jcc.t4.a.w(a.java:260)
at com.ibm.db2.jcc.t4.b.a(b.java:1775)
at com.ibm.db2.jcc.b.eb.a(eb.java:452)
at com.ibm.db2.jcc.b.eb.<init>(eb.java:417)
at com.ibm.db2.jcc.t4.b.<init>(b.java:296)
at com.ibm.db2.jcc.DB2Driver.connect(DB2Driver.java:193)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at org.pentaho.di.core.database.Database.connectUsingClass(Database.java:416)
... 58 more
Caused by: java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:519)
at com.ibm.db2.jcc.t4.y.run(y.java:34)
at java.security.AccessController.doPrivileged(Native Method)
at com.ibm.db2.jcc.t4.xb.a(xb.java:348)
... 68 more
主机名 : 172.168.23.36
端口 : 52000
数据库名:DW_DB
一开始检查了DB2数据库没有问题，IP地址可以ping通，52000端口也处于监听状态，数据库名、用户名、密码都书写正确。应用程序连接其他的DB2都正常，唯独这个库无法访问。
根据报错信息，到IBM官网查了半天，没有找到原因。后来想到，是不是防火墙问题？于是telnet IP地址 52000端口，测试果然是不通的。原因就在这里，应该是防火墙策略屏蔽了本机IP网段，导致路由不通。
总结，这类问题的思路，首先应该想到最基本的可能原因，如：路由、端口等，telnet端口测试一下就知道了。
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