i have this very simple java class where i try to run a H2 DB like this:
public static void main(String[] args) {
Connection conn = null;
try {
Class.forName("org.h2.Driver");
Server server = Server.createTcpServer("-tcpPort", "50001", "-tcpAllowOthers").start();
conn = DriverManager.getConnection(
"jdbc:h2:tcp://localhost/~/H2TestDB/SMPS_DK", "sa", "sa");
I tried to copy what i found here and in the H2 doc already but for some reason the connection gets refused. I tried to find the solution here but havent been successfull so far. FYI: I am kind of a rookie so it would be great to get a more detailed answer if possible ;) Thanks in advance!
Here comes the stacktrace:
> org.h2.jdbc.JdbcSQLException: Verbindung ist unterbrochen: "java.net.ConnectException: Connection refused: connect: localhost"
Connection is broken: "java.net.ConnectException: Connection refused: connect: localhost" [90067-196]
at org.h2.message.DbException.getJdbcSQLException(DbException.java:345)
at org.h2.message.DbException.get(DbException.java:168)
at org.h2.engine.SessionRemote.connectServer(SessionRemote.java:457)
at org.h2.engine.SessionRemote.connectEmbeddedOrServer(SessionRemote.java:334)
at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:116)
at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:100)
at org.h2.Driver.connect(Driver.java:69)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at connection.Main.main(Main.java:26)
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 org.h2.util.NetUtils.createSocket(NetUtils.java:103)
at org.h2.util.NetUtils.createSocket(NetUtils.java:83)
at org.h2.engine.SessionRemote.initTransfer(SessionRemote.java:115)
at org.h2.engine.SessionRemote.connectServer(SessionRemote.java:453)
... 7 more
Related
In restassured am getting the "java.net.ConnectException: Connection refused: connect" if I execute the below function tu3 from a different class. If I call the function from parent class, it is successfully executed. Please let me know how to correct this.
#Parameters({"Param 1","Param 2"})
#Test
public void tu3(#Optional String la, #Optional int StatusCode ) throws
IOException
System.out.println("Test"+la);
System.out.println(URI);
given().pathParam("user_ID", la)
.when().delete("/{user_ID}")
.then().statusCode(StatusCode);
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)
here is the problem i guess userid is double quotes
.when().delete("/{user_ID}")
Correct line should be
.when().delete("URL/"+user_ID)
Your URL should be URL/1 where 1 is user_id, not URL/{user_id}
You should pass userID to be deleted
In .delete you should provide whole API URL
I'm having some issues for creating a simple socket, I'm new to this kind of stuff sorry for a simple question thanks. I tried to follow some tutorial for creating Sockets in java and tried this so far
try {
Socket chatSocket = new Socket("127.0.0.1", 4242);
System.out.println("connection established");
}
catch (IOException e) {
e.printStackTrace();
}
I'm getting this kind of error
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 application.main.main(main.java:15)
and when I try to access my localhost from my browser I see this error
The connection to '127.0.0.1' failed.
Error: ConnectionRefused (0x274d).
System.Net.Sockets.SocketException No connection could be made because the
target machine actively refused it 127.0.0.1:4242
I have no idea what is happening because, just followed what the tutorial does. I think the issue is on my local machine but I have no idea what is making the connection refuse
So i have read up on similar questions but i haven't found anything that i fully understand yet.
http://www.coderanch.com/t/487650/java/java/java-rmi-ConnectException-Connection-refused
http://protegewiki.stanford.edu/wiki/Troubleshooting_Client_Server_Connections
what is RMI registry
http://docs.oracle.com/javase/7/docs/technotes/guides/rmi/faq.html#domain
I have a server which is crashing every few days and I am trying to work out where the problem lies. The software is running in an environment supplied by the customer and i need to know if we are the problem or windows/the network.
My question is... RMI registry, Is that something that java creates or is it something that exists in windows anyway? Why would a connection to localhost suddenly become unavailable or refused? Is there anything that i can do to troubleshoot immediately?
The RMI configuration is here:
<RMIService>
<class>com.s.i.system.RMIService</class>
<server name="Server">
<host>localhost</host>
<timeout>0</timeout>
</server>
</RMIService>
Here is the error that is created in the logs.
2015-04-02 16:52:10,057 ERROR [main] com...........gui.initialise.ClientInitialise - java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
java.net.ConnectException: Connection refused: 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 com.s.i.system.RMIService.lookup(RMIService.java:570)
at com.s.i.system.RMIService.lookupServer(RMIService.java:377)
at com.s.i.process.RemoteRequestHandler$Dispatcher.run(RemoteRequestHandler.java:282)
at com.s.i.process.RemoteRequestHandler$Dispatcher.start(RemoteRequestHandler.java:269)
at com.s.i.process.RemoteRequestHandler.handle(RemoteRequestHandler.java:96)
at com.s.i.process.RequestDispatcher.dispatch(RequestDispatcher.java:136)
at com.s.i.client.ClientInitialiser.initialiseEnvironment(ClientInitialiser.java:498)
at com.s.i.client.ClientInitialiser.performEnvironmentInit(ClientInitialiser.java:145)
at com.s.i.client.ClientInitialiser.initialise(ClientInitialiser.java:128)
at com.s.i.client.ClientInitialiser.initialise(ClientInitialiser.java:106)
at com.s.i.gui.initialise.ClientInitialise.createInitialiser(ClientInitialise.java:136)
at com.s.i.gui.initialise.ClientInitialise.<init>(ClientInitialise.java:155)
at com.s.i.client.Client.initialise(Client.java:118)
at com.s.i.client.Client.main(Client.java:147)
Caused by: java.net.ConnectException: Connection refused: 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 Source)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(Unknown Source)
... 20 more
The RMI Registry is a component of the JRE, not of Windows. Clearly it is crashing, or far more probably it is being closed down incorrectly for some reason. I've never seen an RMI Registry crash in 18 years.
To monitor and manage routes, we are trying to use JMX with camel.
Our jmxAgent configuration is as follows.
<camelContext xmlns="http://camel.apache.org/schema/spring">
<jmxAgent id="agent"
connectorPort="9999"
createConnector="false"
usePlatformMBeanServer="true"
serviceUrlPath="/jmxrmi/camel"
loadStatisticsEnabled="true"
statisticsLevel="All"/>
<route>
A simple java class is used to connect to the "jmxAgent"
try{
JMXServiceURL url = new JMXServiceURL("service:jmx:rmi://localhost:9999/jndi/rmi://localhost:1099/jmxrmi/camel");
JMXConnector jmxc = JMXConnectorFactory.connect(url);
MBeanServerConnection server = jmxc.getMBeanServerConnection();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
But I'm getting the following exception
java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
java.net.ConnectException: Connection refused: connect]
at javax.management.remote.rmi.RMIConnector.connect(Unknown Source)
at javax.management.remote.JMXConnectorFactory.connect(Unknown Source)
at javax.management.remote.JMXConnectorFactory.connect(Unknown Source)
at com.acme.jmx.bridgeJMXBridge.main(JMXBridge.java:19)
Caused by: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
java.net.ConnectException: Connection refused: connect]
at com.sun.jndi.rmi.registry.RegistryContext.lookup(Unknown Source)
at com.sun.jndi.toolkit.url.GenericURLContext.lookup(Unknown Source)
at javax.naming.InitialContext.lookup(Unknown Source)
at javax.management.remote.rmi.RMIConnector.findRMIServerJNDI(Unknown Source)
at javax.management.remote.rmi.RMIConnector.findRMIServer(Unknown Source)
... 4 more
Caused by: java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
java.net.ConnectException: Connection refused: 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)
... 9 more
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 sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(Unknown Source)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(Unknown Source)
... 14 more
Please give me some pointers to solve this issue.
Thanks,
San
You need to set
createConnector="true"
And when you do that, then Camel should log at INFO level the service url you can use from java code or jconsole to connect to it.
I have a problem with access the gmail from my working area. This is my code. It works in my home when network settings are default. The main problem is, in the working area there is more security on computers and network like firewalls etc..
I have to find a solution for run this script behind the firewall. Closing the firewall is not a permanent solution.
Also I added the error message to the below. Any help is appreciated.
`com.sun.mail.util.MailConnectException: Couldn't connect to host, port: imap.gmail.com, 993; timeout -1;
nested exception is:
java.net.ConnectException: Connection timed out: connect
at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:672)
at javax.mail.Service.connect(Service.java:345)
at javax.mail.Service.connect(Service.java:226)
at unreadmails.MailReader.<init>(MailReader.java:23)
at unreadmails.MailReader.main(MailReader.java:12)
Caused by: java.net.ConnectException: Connection timed out: connect
at java.net.TwoStacksPlainSocketImpl.socketConnect(Native Method)
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 com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:297)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:229)
at com.sun.mail.iap.Protocol.<init>(Protocol.java:116)
at com.sun.mail.imap.protocol.IMAPProtocol.<init>(IMAPProtocol.java:115)
at com.sun.mail.imap.IMAPStore.newIMAPProtocol(IMAPStore.java:689)
at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:638)
... 4 more`