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# PublishJMS

## Summary

This processor publishes the contents of the incoming FlowFile to a JMS compliant messaging system.

This processor does two things. It constructs JMS Message by extracting FlowFile contents (both body and attributes).
Once message is constructed it is sent to a pre-configured JMS Destination. Standard JMS Headers will be extracted from
the FlowFile and set on _javax.jms.Message_ as JMS headers while other FlowFile attributes will be set as properties of
_javax.jms.Message_. Upon success the incoming FlowFile is transferred to the _success_ Relationship and upon failure
FlowFile is penalized and transferred to the _failure_ Relationship.

## Configuration Details

At the time of writing this document it only defines the essential configuration properties which are suitable for most
cases. Other properties will be defined later as this component progresses. Configuring PublishJMS:

1. **User Name** - \[OPTIONAL\] User Name used for authentication and authorization when this processor obtains
   _javax.jms.Connection_ from the pre-configured _javax.jms.ConnectionFactory_ (see below).
2. **Password** - \[OPTIONAL\] Password used in conjunction with **User Name**.
3. **Destination Name** - \[REQUIRED\] the name of the _javax.jms.Destination_. Usually provided by administrator
   (e.g., 'topic://myTopic').
4. **Destination Type** - \[REQUIRED\] the type of the _javax.jms.Destination_. Could be one of 'QUEUE' or 'TOPIC'
   Usually provided by the administrator. Defaults to 'QUEUE'.

### Connection Factory Configuration

There are multiple ways to configure the Connection Factory for the processor:

* **Connection Factory Service** property - link to a pre-configured controller service
  (_JndiJmsConnectionFactoryProvider_ or _JMSConnectionFactoryProvider_)
* **JNDI &ast;** properties - processor level configuration, the properties are the same as the properties of
  _JndiJmsConnectionFactoryProvider_ controller service, the dynamic properties can also be used in this case
* **JMS &ast;** properties - processor level configuration, the properties are the same as the properties of
  _JMSConnectionFactoryProvider_ controller service, the dynamic properties can also be used in this case

The preferred way is to use the Connection Factory Service property and a pre-configured controller service. It is also
the most convenient method, because it is enough to configure the controller service once and then it can be used in
multiple processors.

However, some JMS client libraries may not work with the controller services due to incompatible Java ClassLoader
handling between the 3rd party JMS client library and NiFi. Should you encounter _java.lang.ClassCastException_ errors
when using the controller services, please try to configure the Connection Factory via the 'JNDI \*' or the 'JMS \*' and
the dynamic properties of the processor. For more details on these properties, see the documentation of the
corresponding controller service (_JndiJmsConnectionFactoryProvider_ for 'JNDI \*' and _JMSConnectionFactoryProvider_
for 'JMS \*').