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Chapter 172. JCR Component
Available as of Camel version 1.3
The jcr component allows you to add/read nodes to/from a JCR compliant content repository (for example, Apache Jackrabbit) with its producer, or register an EventListener with the consumer.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-jcr</artifactId>
<version>x.x.x</version>
<!-- use the same version as your Camel core version -->
</dependency>172.1. URI format
jcr://user:password@repository/path/to/node
Consumer added
From Camel 2.10 onwards you can use consumer as an EventListener in JCR or a producer to read a node by identifier.
172.2. Usage
The repository element of the URI is used to look up the JCR Repository object in the Camel context registry.
172.2.1. JCR Options
The JCR component has no options.
The JCR endpoint is configured using URI syntax:
jcr:host/base
with the following path and query parameters:
172.2.2. Path Parameters (2 parameters):
| Name | Description | Default | Type |
|---|---|---|---|
| host | Required Name of the javax.jcr.Repository to lookup from the Camel registry to be used. | String | |
| base | Get the base node when accessing the repository | String |
172.2.3. Query Parameters (14 parameters):
| Name | Description | Default | Type |
|---|---|---|---|
| deep (common) | When isDeep is true, events whose associated parent node is at absPath or within its subgraph are received. | false | boolean |
| eventTypes (common) | eventTypes (a combination of one or more event types encoded as a bit mask value such as javax.jcr.observation.Event.NODE_ADDED, javax.jcr.observation.Event.NODE_REMOVED, etc.). | int | |
| nodeTypeNames (common) | When a comma separated nodeTypeName list string is set, only events whose associated parent node has one of the node types (or a subtype of one of the node types) in this list will be received. | String | |
| noLocal (common) | If noLocal is true, then events generated by the session through which the listener was registered are ignored. Otherwise, they are not ignored. | false | boolean |
| password (common) | Password for login | String | |
| sessionLiveCheckInterval (common) | Interval in milliseconds to wait before each session live checking The default value is 60000 ms. | 60000 | long |
| sessionLiveCheckIntervalOn Start (common) | Interval in milliseconds to wait before the first session live checking. The default value is 3000 ms. | 3000 | long |
| username (common) | Username for login | String | |
| uuids (common) | When a comma separated uuid list string is set, only events whose associated parent node has one of the identifiers in the comma separated uuid list will be received. | String | |
| workspaceName (common) | The workspace to access. If it’s not specified then the default one will be used | String | |
| bridgeErrorHandler (consumer) | Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. | false | boolean |
| exceptionHandler (consumer) | To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored. | ExceptionHandler | |
| exchangePattern (consumer) | Sets the exchange pattern when the consumer creates an exchange. | ExchangePattern | |
| synchronous (advanced) | Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported). | false | boolean |
172.3. Spring Boot Auto-Configuration
The component supports 2 options, which are listed below.
| Name | Description | Default | Type |
|---|---|---|---|
| camel.component.jcr.enabled | Enable jcr component | true | Boolean |
| camel.component.jcr.resolve-property-placeholders | Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders. | true | Boolean |
Please note that the JCR Producer used message properties instead of message headers in Camel versions earlier than 2.12.3. See https://issues.apache.org/jira/browse/CAMEL-7067 for more details.
172.4. Example
The snippet below creates a node named node under the /home/test node in the content repository. One additional property is added to the node as well: my.contents.property which will contain the body of the message being sent.
from("direct:a").setHeader(JcrConstants.JCR_NODE_NAME, constant("node"))
.setHeader("my.contents.property", body())
.to("jcr://user:pass@repository/home/test");The following code will register an EventListener under the path import-application/inbox for Event.NODE_ADDED and Event.NODE_REMOVED events (event types 1 and 2, both masked as 3) and listening deep for all the children.
<route>
<from uri="jcr://user:pass@repository/import-application/inbox?eventTypes=3&deep=true" />
<to uri="direct:execute-import-application" />
</route>172.5. See Also
- Configuring Camel
- Component
- Endpoint
- Getting Started
