当我配置新数据源以管理Setting up Oracle之后的注册管理机构或用户管理数据，然后启动API管理器时，它会报告以下错误：
[2016-08-05 09:59:49,876] ERROR - TransactionManager Failed to start new registry transaction.
java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:458)
at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:546)
at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:236)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:521)
at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:278)
at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:182)
at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:701)
at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:635)
at org.apache.tomcat.jdbc.pool.ConnectionPool.getConnection(ConnectionPool.java:188)
at org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection(DataSourceProxy.java:128)
at org.wso2.carbon.registry.core.jdbc.dataaccess.JDBCTransactionManager.beginTransaction(JDBCTransactionManager.java:80)
at org.wso2.carbon.registry.core.jdbc.EmbeddedRegistry.beginTransaction(EmbeddedRegistry.java:443)
at org.wso2.carbon.registry.core.jdbc.EmbeddedRegistry.get(EmbeddedRegistry.java:505)
at org.wso2.carbon.registry.core.caching.CacheBackedRegistry.get(CacheBackedRegistry.java:203)
at org.wso2.carbon.registry.core.session.UserRegistry.getInternal(UserRegistry.java:617)
at org.wso2.carbon.registry.core.session.UserRegistry.access$400(UserRegistry.java:61)
at org.wso2.carbon.registry.core.session.UserRegistry$5.run(UserRegistry.java:597)
at org.wso2.carbon.registry.core.session.UserRegistry$5.run(UserRegistry.java:594)
at java.security.AccessController.doPrivileged(Native Method)
at org.wso2.carbon.registry.core.session.UserRegistry.get(UserRegistry.java:594)
at org.wso2.carbon.registry.indexing.AsyncIndexer$IndexingTask.createIndexDocument(AsyncIndexer.java:242)
at org.wso2.carbon.registry.indexing.AsyncIndexer$IndexingTask.run(AsyncIndexer.java:210)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: oracle.net.ns.NetException: The Network Adapter could not establish the connection
at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:392)
at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:434)
at oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:687)
at oracle.net.ns.NSProtocol.connect(NSProtocol.java:363)
at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1102)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:320)
... 27 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at oracle.net.nt.TcpNTAdapter.connect(TcpNTAdapter.java:150)
at oracle.net.nt.ConnOption.connect(ConnOption.java:133)
at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:370)
... 32 more
是什么原因？我可以确认数据源配置是否正常，我可以从reg db找到结果，并且每次检查/测试碳页面的数据源，它们也没问题。
答案 0 :(得分：0)
错误表明您遇到了与DB的连接问题。
引起：java.net.ConnectException：拒绝连接
所以我建议你仔细检查你的数据库连接。首先telnet到oracle并确保你可以成功连接到DB。
telnet localhost 1521
确保将防火墙配置为允许连接到数据库。