配置了derby数据库后启动tomcat 服务报错

阅读更多

在本应用中由于是以derby数据库作为数据存储，采用网络连接方式连接derby，在启动tomcat 服务是进行一些数据库的初始化工作，比如创建表之类的。

所以就特地创建了一个servlet 去做这些初始化工作。

在web.xml中配置如下：

...

        derbynet

        org.apache.derby.drda.NetServlet

       

            startNetworkServerOnInit

            true

            Starts the Network Server at servlet

                    initialization if 'true'.

       

       

            portNumber

            1527

            Port number to use. The default is 1527.

       

       

            host

            localhost

            Host Name to use. The default is "localhost". Please secure any server which listens on a public address.

       

       

            tracingDirectory

           

            Directory where trace files should be placed.

       

        true

   

 

   

        InitializeDatabase

        com.sap.pf.prp.servlet.InitializeDatabase

        0

   

...

 

一切妥当之后，在eclipse下启动tomcat 服务，一切正常。

但是当我启动tomcat目录下的startup.bat时，就报错了，信息如下：

 

java.sql.SQLNonTransientConnectionException: java.net.ConnectException : Error c

onnecting to server localhost on port 1527 with message Connection refused: conn

ect.

        at org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(Unkn

own Source)

        at org.apache.derby.client.am.SqlException.getSQLException(Unknown Sourc

e)

        at org.apache.derby.jdbc.ClientDriver.connect(Unknown Source)

        at java.sql.DriverManager.getConnection(DriverManager.java:582)

        at java.sql.DriverManager.getConnection(DriverManager.java:185)

        at com.sap.pf.prp.db.DBManager.getConnection(DBManager.java:56)

        at com.sap.pf.prp.db.DBManager.initDB(DBManager.java:27)

        at com.sap.pf.prp.servlet.InitializeDatabase.init(InitializeDatabase.jav

a:13)

        at javax.servlet.GenericServlet.init(GenericServlet.java:212)

        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.

java:1139)

        at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:96

6)

        at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContex

t.java:3956)

        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4

230)

        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)

 

        at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)

        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)

 

        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443

)

        at org.apache.catalina.core.StandardService.start(StandardService.java:4

48)

        at org.apache.catalina.core.StandardServer.start(StandardServer.java:700

)

        at org.apache.catalina.startup.Catalina.start(Catalina.java:552)

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.

java:39)

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces

sorImpl.java:25)

        at java.lang.reflect.Method.invoke(Method.java:597)

        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)

        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)

Caused by: org.apache.derby.client.am.DisconnectException: java.net.ConnectExcep

tion : Error connecting to server localhost on port 1527 with message Connection

 refused: connect.

        at org.apache.derby.client.net.NetAgent.(Unknown Source)

        at org.apache.derby.client.net.NetConnection.newAgent_(Unknown Source)

        at org.apache.derby.client.am.Connection.(Unknown Source)

        at org.apache.derby.client.net.NetConnection.(Unknown Source)

        at org.apache.derby.client.net.NetConnection40.(Unknown Source)

        at org.apache.derby.client.net.ClientJDBCObjectFactoryImpl40.newNetConne

ction(Unknown Source)

        ... 24 more

Caused by: java.net.ConnectException: Connection refused: connect

        at java.net.PlainSocketImpl.socketConnect(Native Method)

        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)

        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)

        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)

        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)

        at java.net.Socket.connect(Socket.java:529)

        at java.net.Socket.connect(Socket.java:478)

        at java.net.Socket.(Socket.java:375)

        at java.net.Socket.(Socket.java:189)

        at javax.net.DefaultSocketFactory.createSocket(SocketFactory.java:206)

        at org.apache.derby.client.net.OpenSocketAction.run(Unknown Source)

        at java.security.AccessController.doPrivileged(Native Method)

        ... 30 more

Feb 11, 2015 1:34:10 PM org.apache.coyote.http11.Http11BaseProtocol start

INFO: Starting Coyote HTTP/1.1 on http-80

 

在网上搜了好一阵子，都没有找到真正的解决办法。

https://db.apache.org/derby/docs/10.4/adminguide/tadmincbdjhhfd.html

http://db.apache.org/derby/papers/DerbyTut/ns_intro.html

http://stackoverflow.com/questions/10420902/data-sources-derby-connection-refused

 

最后经过仔细的排查，发现其实是我自己的web.xml配置中【servlet启动优先级设置】的问题。

只需要将derbynet中：

true =====> 0

 

再将初始化数据库的那个servlet的load-on-startup 改为1 即：

0 ====> 1

 

改完了之后重新发布启动tomcat，一切正常。