its not possible to connect to the Oracle Database. The database is running and i get the following error when i try to ping the database from Eclipse.
java.sql.SQLRecoverableException: I/O-Fehler:
The Network Adapter could not establish the connection
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:478)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:547)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:225)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:29)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:556)
at oracle.eclipse.tools.database.connectivity.db.OracleJDBCConnection.createConn(OracleJDBCConnection.java:193)
at oracle.eclipse.tools.database.connectivity.db.OracleJDBCConnection.createConnection(OracleJDBCConnection.java:149)
at org.eclipse.datatools.connectivity.DriverConnectionBase.internalCreateConnection(DriverConnectionBase.java:105)
at org.eclipse.datatools.connectivity.DriverConnectionBase.open(DriverConnectionBase.java:54)
at org.eclipse.datatools.connectivity.drivers.jdbc.JDBCConnection.open(JDBCConnection.java:96)
at oracle.eclipse.tools.database.connectivity.db.OracleJDBCConnectionFactory.createConnection(OracleJDBCConnectionFactory.java:26)
at org.eclipse.datatools.connectivity.internal.ConnectionFactoryProvider.createConnection(ConnectionFactoryProvider.java:83)
at org.eclipse.datatools.connectivity.internal.ConnectionProfile.createConnection(ConnectionProfile.java:359)
at org.eclipse.datatools.connectivity.ui.PingJob.createTestConnection(PingJob.java:76)
at org.eclipse.datatools.connectivity.ui.PingJob.run(PingJob.java:59)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: oracle.net.ns.NetException: The Network Adapter could not establish the connection
at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:372)
at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:419)
at oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:873)
at oracle.net.ns.NSProtocol.connect(NSProtocol.java:258)
at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1577)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:353)
... 15 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at oracle.net.nt.TcpNTAdapter.connect(TcpNTAdapter.java:206)
at oracle.net.nt.ConnOption.connect(ConnOption.java:120)
at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:350)
... 20 more
The configuration is the following:
Iam complete new to the Oracle Database. So how to solve this problem?
The underlying exception is this:
Caused by: java.net.ConnectException: Connection refused: connect
That means that there was nothing listening for the database connection. Some of the possible explanations are:
You are connecting to the wrong host.
You are using the wrong port
The database is not running at the moment
There is firewall blocking your access, and "refusing" the connections.
I note that you have set the host to "localhost". That will only work if your Java client is running on the same host as the database.
Related
I have used the following code to start the Java DB server:
System.setProperty("derby.drda.startNetworkServer", "true");
try {
NetworkServerControl serverControl = new NetworkServerControl();
serverControl.start(new PrintWriter(System.out, true));
} catch (Exception e) {
e.printStackTrace();
}
I can connect to the database on the local PC using the URL:
String dbURLTable = "jdbc:derby://localhost:1527/Tables;create=true;user=Gen;password=YZG";
But when I try to connect to it on LAN (Firewall disabled) I use the following URL:
String dbURLTable = "jdbc:derby://192.168.1.105:1527/Tables;create=true;user=Gen;password=YZG";
Yet the other PC cannot connect to this database, what's the problem?
The error I'm getting is:
java.sql.SQLNonTransientConnectionException: java.net.ConnectException : Error connecting to server 192.168.1.106 on port 1,527 with message Connection refused: connect.
at org.apache.derby.client.am.SQLExceptionFactory.getSQLException(Unknown Source)
at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source)
at org.apache.derby.jdbc.ClientDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:270)
at Admin.CreateTables.CreateT(CreateTables.java:188)
at Admin.CreateTables.run(CreateTables.java:13)
at java.lang.Thread.run(Thread.java:745)
Caused by: ERROR 08001: java.net.ConnectException : Error connecting to server 192.168.1.106 on port 1,527 with message Connection refused: connect.
at org.apache.derby.client.net.NetAgent.<init>(Unknown Source)
at org.apache.derby.client.net.NetConnection.newAgent_(Unknown Source)
at org.apache.derby.client.am.ClientConnection.<init>(Unknown Source)
at org.apache.derby.client.net.NetConnection.<init>(Unknown Source)
at org.apache.derby.client.net.ClientJDBCObjectFactoryImpl.newNetConnection(Unknown Source)
... 6 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
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 java.net.Socket.connect(Socket.java:538)
at java.net.Socket.<init>(Socket.java:434)
at java.net.Socket.<init>(Socket.java:211)
at javax.net.DefaultSocketFactory.createSocket(SocketFactory.java:271)
at org.apache.derby.client.net.OpenSocketAction.run(Unknown Source)
at org.apache.derby.client.net.OpenSocketAction.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 11 more
This is happening because you are creating NetworkServerControl by using 0-arg constructor NetworkServerControl() which does not allow remote connections
You have to use NetworkServerControl(InetAddress address, int portNumber) in order to allow remote connections
//accepts connections from other hosts on an IPv4 system
NetworkServerControl serverControl =
new NetworkServerControl(InetAddress.getByName("0.0.0.0"),1527);
For details please see this
I am trying out implementing gcm server application using XMPP(CCS) and i cant able to connect to the google servers.
I am trying out the sample code from http://developer.android.com/google/gcm/ccs.html
when i try to connect
ccsClient.connect(userName, password);
i get the following error
gcm.googleapis.com:5235 Exception: XMPPError connecting to gcm.googleapis.com:5235.; : remote-server-error(502)
-- caused by: XMPPError connecting to gcm.googleapis.com:5235.: remote-server-error(502) XMPPError connecting to gcm.googleapis.com:5235.
-- caused by: java.net.ConnectException: Connection timed out: connect
at org.jivesoftware.smack.XMPPConnection.connectUsingConfiguration(XMPPConnection.java:592)
at org.jivesoftware.smack.XMPPConnection.connect(XMPPConnection.java:1010)
at SmackCcsClient.connect(SmackCcsClient.java:249)
at Sample.main(Sample.java:342)
Nested Exception:
XMPPError connecting to gcm.googleapis.com:5235.: remote-server-error(502) XMPPError connecting to gcm.googleapis.com:5235.
-- caused by: java.net.ConnectException: Connection timed out: connect
at org.jivesoftware.smack.XMPPConnection.connectUsingConfiguration(XMPPConnection.java:565)
at org.jivesoftware.smack.XMPPConnection.connect(XMPPConnection.java:1010)
at SmackCcsClient.connect(SmackCcsClient.java:249)
at Sample.main(Sample.java:342)
Nested Exception:
java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.<init>(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketFactoryImpl.createSocket(Unknown Source)
at org.jivesoftware.smack.XMPPConnection.connectUsingConfiguration(XMPPConnection.java:557)
at org.jivesoftware.smack.XMPPConnection.connect(XMPPConnection.java:1010)
at SmackCcsClient.connect(SmackCcsClient.java:249)
at Sample.main(Sample.java:342)
Exception in thread "main" java.lang.NoClassDefFoundError: SmackCcsClient$GcmPacketExtension
at SmackCcsClient.send(SmackCcsClient.java:130)
at Sample.main(Sample.java:357)
Caused by: java.lang.ClassNotFoundException: SmackCcsClient$GcmPacketExtension
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 2 more
I am using server key for the API key(password)
and username="project number"+"#gcm.googleapis.com"
My project is whitelisted for upstream messaging
Ports considered to be closed are made open at my workplace. 5228, 5229, and 5230 for my IP.
which Ip should i use to open up the ports? public Ip or the other one?
What could be the problem?
Please help me resolve this! Thanks in advance
Can you try from the command line - for example
"telnet gcm.googleapis.com 5235"
If you see "Connected to gcm.l.google.com" - your firewall is good.
CCS ( the XMPP endpoint using by 3rd party servers ) is using port 5235 -
the 5228, 5229 ports are needed for android/chrome devices connecting to GCM.
AFAIK 5230 is not one of our ports, not sure how you got it.
I am trying to update the database table which is hosted on the server through MYSQL JDBC connector using eclipse.
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://49.**.***.115:3306/databasename";
String name = "user";
String password = "passs";
But I not able to connect to the database from my local machine. I checked all the information provided above are correct.
Can please some tell me what to i do next?
Here is the error:
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1121)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:357)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2479)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2516)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2301)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:346)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at connecttoDB.getconnection(connecttoDB.java:27)
at updateDB.main(updateDB.java:17)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:307)
... 16 more
Have you verified that you can connect to your database server from the machine you are running this code on? It looks like there is a network problem. A good idea as a first step to diagnosing MySQL connection problems is to always try connecting from the command line to rule out networking or credentials problems
mysql -uuser -p -h49.**.***.115 databasename
where "user" is the username "databasename" is the database and "49.**.***.115" is the ip of the database server.
check the following steps:
1- Ping the IP address to see if you can establish connection, There might be a firewall that is blocking incoming/outgoing communication.
2- Check that your ojdbc6/ojdbc14.jar is loaded in the same directory of your application.
I am trying to run Nutch 2 crawler on my system but I get the following error:
Exception in thread "main" org.apache.gora.util.GoraException: java.io.IOException: java.sql.SQLTransientConnectionException: java.net.ConnectException: Connection refused
at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:167)
at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:135)
at org.apache.nutch.storage.StorageUtils.createWebStore(StorageUtils.java:69)
at org.apache.nutch.crawl.InjectorJob.run(InjectorJob.java:243)
at org.apache.nutch.crawl.Crawler.runTool(Crawler.java:68)
at org.apache.nutch.crawl.Crawler.run(Crawler.java:136)
at org.apache.nutch.crawl.Crawler.run(Crawler.java:250)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.nutch.crawl.Crawler.main(Crawler.java:257)
Caused by: java.io.IOException: java.sql.SQLTr
ansientConnectionException: java.net.ConnectException: Connection refused
at org.apache.gora.sql.store.SqlStore.getConnection(SqlStore.java:747)
at org.apache.gora.sql.store.SqlStore.initialize(SqlStore.java:160)
at org.apache.gora.store.DataStoreFactory.initializeDataStore(DataStoreFactory.java:102)
at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:161)
... 8 more
Caused by: java.sql.SQLTransientConnectionException: java.net.ConnectException: Connection refused
at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
at org.hsqldb.jdbc.JDBCConnection.<init>(Unknown Source)
at org.hsqldb.jdbc.JDBCDriver.getConnection(Unknown Source)
at org.hsqldb.jdbc.JDBCDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(DriverManager.java:620)
at java.sql.DriverManager.getConnection(DriverManager.java:200)
at org.apache.gora.sql.store.SqlStore.getConnection(SqlStore.java:739)
... 11 more
Caused by: org.hsqldb.HsqlException: java.net.ConnectException: Connection refused
at org.hsqldb.ClientConnection.openConnection(Unknown Source)
at org.hsqldb.ClientConnection.initConnection(Unknown Source)
at org.hsqldb.ClientConnection.<init>(Unknown Source)
... 17 more
Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:327)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:193)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:180)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:384)
at java.net.Socket.connect(Socket.java:546)
at java.net.Socket.connect(Socket.java:495)
at java.net.Socket.<init>(Socket.java:392)
at java.net.Socket.<init>(Socket.java:206)
at org.hsqldb.server.HsqlSocketFactory.createSocket(Unknown Source)
... 20 more
what is the problem? my internet connection is direct.
I had the same error. I changed the connection URL from
<property name="connection.url">jdbc:hsqldb:hsql://localhost</property>
to
<property name="connection.url">jdbc:hsqldb:mem://localhost</property>
and it did the trick.
Had the same error. I forgot 'configuration' tag at conf/nutch-site.xml:
<configuration>
<property>
<name>storage.data.store.class</name>
<value>org.apache.gora.hbase.store.HBaseStore</value>
<description>Default class for storing data</description>
</property>
</configuration>
When I test an RMI client and server with the class files it works without any issue on two different machines. Now when I do the same thing with a jar the client fails to connect to the RMIRegistry on the server. Then when I test with the jar on the same machine, the client can connect to the server (even over the network ip and not localhost).
I suspect this has something to do with the RMI registry, but i'm a total novice at RMI, so I have no clue...
I create an RMIRegistry like so:
rmiregistry = LocateRegistry.createRegistry(ServiceConstraints.REGISTRY_PORT);
rmiService = (RmiSubjectService) UnicastRemoteObject.exportObject(this,
ServiceConstraints.REGISTRY_PORT);
rmiregistry.rebind("RmiService", rmiService);
The client connects like this:
remoteService = (RmiSubjectService) Naming.lookup("/" + host + ":"+ port + "/RmiService");
The error I get on the client when running with a jar:
java.rmi.ConnectException: Connection refused to host: 192.168.2.132; nested exception is:
java.net.ConnectException: Connection timed out: connect
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(Unknown Source)
at sun.rmi.transport.tcp.TCPChannel.createConnection(Unknown Source)
at sun.rmi.transport.tcp.TCPChannel.newConnection(Unknown Source)
at sun.rmi.server.UnicastRef.newCall(Unknown Source)
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at java.rmi.Naming.lookup(Unknown Source)
at ch.uzh.ifi.group10.client.Client.subscribe(Client.java:148)
at ch.uzh.ifi.group10.client.Client.main(Client.java:242)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoa
der.java:58)
Caused by: java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(Unknown S
ource)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(Unknown S
ource)
... 13 more
The problem did turn out to be the network. Specifically it was that I didn't realize that my firewall was blocking the socket, so I could not connect.