Is your ActiveMQ Web console throws an exception while you are trying to view/browse the messages? Is it similar to what you see below, then this article could help you solve it. Good Luck

The Problem:
When the Active MQ broker is Secured and when you are trying to browse the  Contents of Queue (or) Topic through the web console. You may encounter the following error/ exception.

Exception occurred while processing this request, check the log for more information! 



When you go and check the activemq.log in the data directory, you may see the following exception:

2018-05-07 12:13:41,028 | INFO  | Connector vm://localhost started | org.apache.activemq.broker.TransportConnector | qtp61137731-42
2018-05-07 12:13:41,041 | WARN  | Failed to add Connection id=ID:Saravanans-Air-53261-1525674467606-4:6, clientId=ID:Saravanans-Air-53261-1525674467606-3:6 due to {} | org.apache.activemq.broker.TransportConnection | ActiveMQ VMTransport: vm://localhost#11-1

java.lang.SecurityException: User name [system] or password is invalid.
at org.apache.activemq.security.JaasAuthenticationBroker.authenticate(JaasAuthenticationBroker.java:97)[activemq-all-5.15.3.jar:5.15.3]
 at org.apache.activemq.security.JaasAuthenticationBroker.addConnection(JaasAuthenticationBroker.java:68)[activemq-all-5.15.3.jar:5.15.3]
 at org.apache.activemq.broker.BrokerFilter.addConnection(BrokerFilter.java:99)[activemq-all-5.15.3.jar:5.15.3]
 at org.apache.activemq.broker.TransportConnection.processAddConnection(TransportConnection.java:843)[activemq-all-5.15.3.jar:5.15.3]
 at org.apache.activemq.command.ConnectionInfo.visit(ConnectionInfo.java:139)[activemq-all-5.15.3.jar:5.15.3]
 at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:330)[activemq-all-5.15.3.jar:5.15.3]
 at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:194)[activemq-all-5.15.3.jar:5.15.3]
 at org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:116)[activemq-all-5.15.3.jar:5.15.3]
 at org.apache.activemq.transport.MutexTransport.onCommand(MutexTransport.java:50)[activemq-all-5.15.3.jar:5.15.3]
 at org.apache.activemq.transport.vm.VMTransport.iterate(VMTransport.java:275)[activemq-all-5.15.3.jar:5.15.3]
 at org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:133)[activemq-all-5.15.3.jar:5.15.3]
 at org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:48)[activemq-all-5.15.3.jar:5.15.3]
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)[:1.8.0_152]
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)[:1.8.0_152]
 at java.lang.Thread.run(Thread.java:748)[:1.8.0_152]
2018-05-07 12:13:41,065 | WARN  | Security Error occurred on connection to: vm://localhost#10, User name [system] or password is invalid. | org.apache.activemq.broker.TransportConnection.Service | ActiveMQ VMTransport: vm://localhost#11-1

The Solution:

We presume that you are using inbuilt JAAS authentication to secure the broker If you are using the AD or external authentication you can directly go to Step 4 and Step 5.

Note*: All the configurations files mentioned here supposed to be available at activemq/conf/ directory

Step1

Get the configuration name from the activemq.xml file

<plugins>
   <jaasAuthenticationPlugin configuration="activemq"/>
</plugins>

Here my configuration name is activemq ( highlighted one in the preceding snippet

Step2

In the login.config file of yours, find the directive/grouping named activemq. It will be something like this

activemq {
    org.apache.activemq.jaas.PropertiesLoginModule required
        org.apache.activemq.jaas.properties.user="users.properties"
        org.apache.activemq.jaas.properties.group="groups.properties";
};

Step3

Get the password for your desired user ( in my case its admin ) from the users.properties file ( as it was given as a value for org.apache.activemq.jaas.properties.user in the login.config file)

admin=c0mp!ex@01

Left to the equal sign is your name and to the right is your password, in my case, my password is c0mp!ex@01 and admin is my username

Step4

Open the credentials.properties. This file is used to let the Activemq web console know the username and password it should use while trying to access the broker resources like Queue and Topic

by default, the file might contain values like given below

activemq.username=system
activemq.password=manager
guest.password=password

Replace the activemq.username and activemq.password values with the correct values. in my case, I am going to use the admin account, discussed in the previous step

activemq.username=admin 
activemq.password=c0mp!ex@01

Step5

Restart your ActiveMQ server

aksarav@mwinventory.in:/apps/activemq/apache-activemq-5.15.3/bin$ ./activemq restart
INFO: Loading '/apps/activemq/apache-activemq-5.15.3//bin/env'
INFO: Using java '/usr/bin/java'
INFO: Loading '/apps/activemq/apache-activemq-5.15.3//bin/env'
......
......
INFO: Starting - inspect logfiles specified in logging.properties and log4j.properties to get details
INFO: pidfile created : '/apps/activemq/apache-activemq-5.15.3//data/activemq.pid' (pid '5080')
INFO: Loading '/apps/activemq/apache-activemq-5.15.3//bin/env'
INFO: Using java '/usr/bin/java'
ActiveMQ is running (pid '5080')

Tada!. Now go back to your web console and try to browse the Queue/Topic and you should be OK!