Develop Reference

Avoiding error messages in connecting to active/passive ActiveMQ

I am creating a program to send messages to ActiveMQ. This server is in active/passive configuration with one active and two standby nodes.
My code for creating connections as follows:
String furl = "failover:(tcp://aa.myamq-01:61616:tcp://aa.myamq-02:61616:tcp://aa.myamq-03:61616");
ConnectionFactory = new ActiveMQConnectionFactory(furl);
Connection connection = ConnectionFactory.createConnection();
connection.start();
Everything works as expected. However I get the following output in the console.
ERROR | Connect fail to tcp://aa.myamq-01:61616, error message : Connection refused:Connect
ERROR | Connect fail to tcp://aa.myamq-02:61616, error message : Connection refused:Connect
INFO |Successfully connected to tcp://aa.myamq-03:61616
Is there a way the active server can be identified and connection attempted to it only? Alternatively, can the error messages be suppressed?

AFAIK there isn't in this scenario. Inactive ActiveMQ nodes are actually not accepting connections. Therefor they look like they are down.
But if you would need to find out which node is master you can find that in DB if you use DB backend in ActiveMQ.
Regarding suppressing this message I would not even try to do that because if there would be a regular failure you will not notice it.

Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect

I'm very new in spring boot and trying to build a microservices project using spring boot by referring to tutorial but i'm getting this error. While try to retrieve localhost:8888 i got this "localhost refused to connect". I already try to change server port but still get the same outcome. Please help me.Why did i get this connection refuse? FYI: i try to connect my spring cloud config server to git.

i too has the same issue
i had two spring boot application - LS and SCCS
the port used for LS is 8080
the port used for SCCS is 8888
i tried to pass all the configuration of LS to SCCS and tried to run the LS ....I got the connection timeout error...
instead...
u run the SCCS first.. which is configured in 8888... it works fine
hope this answers your question

Embedded Database project

So I received this error message:
java.sql.SQLNonTransientConnectionException: java.net.ConnectException
: Error connecting to server localhost on port
What does this even mean? I searched it up and what I found was that I never created an embedded database but rather a server? Regardless, the steps I followed were exact in order to create an embedded database.

JMS - Couldn't create session factory even if connection to remote provider is OK

I make a jar to connect to JMS provider, it's work fine in a server (a) but doesn't work on a server (b).
I verify that connection to the JMS provider from server (b) is OK via telnet as shown below:
-> telnet -d 10.127.161.247 4447
Trying 10.127.161.247...
Connected to 10.127.161.247.
The logs and exception that it's throw is below :
2018/08/01 11:19:47:921 - Processing command line arguments...
2018/08/01 11:19:47:927 - Preparing the output... Writing to file = true
2018/08/01 11:19:50:315 - Trying to establish connection, attempt: 0
2018/08/01 11:19:52:132 - Connecting to provider: remote://10.127.161.247:4447 using user: oad_user
2018/08/01 11:19:52:132 - Creating a regular (non-secure) connection factory...
2018/08/01 11:19:53:073 - Opening a connection to the JMS provider...
2018/08/01 11:20:24:192 - Attempt failed: Failed to create session factory
javax.jms.JMSException: Failed to create session factory
at org.apache.activemq.artemis.jms.client.ActiveMQConnectionFactory.createConnectionInternal(ActiveMQConnectionFactory.java:675)
at org.apache.activemq.artemis.jms.client.ActiveMQConnectionFactory.createTopicConnection(ActiveMQConnectionFactory.java:267)
at com.alcatel.ossgw.client.jms.JmsSubscriberClient.prepareConnection(JmsSubscriberClient.java:334)
at com.alcatel.ossgw.client.jms.JmsSubscriberClient.connect(JmsSubscriberClient.java:274)
at com.alcatel.ossgw.client.jms.JmsSubscriberClient.listen(JmsSubscriberClient.java:97)
at com.alcatel.ossgw.client.jms.JmsSubscriberClient.main(JmsSubscriberClient.java:536)
Caused by: ActiveMQNotConnectedException[errorType=NOT_CONNECTED message=AMQ119007: Cannot connect to server(s). Tried with all available servers.]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.createSessionFactory(ServerLocatorImpl.java:818)
at org.apache.activemq.artemis.jms.client.ActiveMQConnectionFactory.createConnectionInternal(ActiveMQConnectionFactory.java:67
I don't how to debug such a problem knowing i'm new in JMS, i'll be grateful for any remarks and ideas..
Many thanks

Did you ever find out why this was happening?
I have a related issue where an active JMS connection suddenly disconnects and the system starts throwing this exception until a system restart is done and then it connects again without fail.

Recovery of the connection in RabbitMQ for Clustered environment

I'm trying to recover the connection in RMQ for Clustered environment but unfortunately i'm not able to recover it in code and its also not catching in my exception.
For example. Initially node 1 is connected and our messages has been flow successfully and to test fail-over, we brought up node 2 and stopped node 1.. connections are being lost which is expected, but retry is not happening as node 2 is up.
When i restart my service, i'm able to get exception as:
"Rabbit MQ Message Exception : Error = 'connection is already closed due to
connection error; cause: java.net.SocketException: Connection reset'"
Can anyone please suggest how to recover it in such case?
Have used below configurations in my code. (AMQP client):
factory.setAutomaticRecoveryEnabled(true);
factory.setNetworkRecoveryInterval(5000);
factory.setTopologyRecoveryEnabled(true);
factory.setRequestedHeartbeat(60);
By using Lyra connection recovery will occur with following config:
.withRetryPolicy(new RetryPolicy()
.withMaxAttempts(30)
.withInterval(Duration.seconds(1))
.withMaxDuration(Duration.minutes(5)));