Chapter 78. JCR

JCR Component

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>

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.

Usage

The repository element of the URI is used to look up the JCR Repository object in the Camel context registry.

Producer

Name Default Value Description
CamelJcrOperation CamelJcrInsert CamelJcrInsert or CamelJcrGetById operation to use
CamelJcrNodeName null Used to determine the node name to use.
CamelJcrNodeType null Camel 2.16: To use a specify primary node type when creating adding a new node.
When a message is sent to a JCR producer endpoint:
  • If the operation is CamelJcrInsert: A new node is created in the content repository, all the message headers of the IN message are transformed to javax.jcr.Value instances and added to the new node and the node's UUID is returned in the OUT message.
  • If the operation is CamelJcrGetById: A new node is retrieved from the repository using the message body as node identifier.
Note
Please note that the JCR Producer used message properties instead of message headers in Camel versions earlier than 2.12.3.

Consumer

The consumer will connect to JCR periodically and return a List<javax.jcr.observation.Event> in the message body.
Name Default Value Description
eventTypes 0 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.
deep false When it is true, events whose associated parent node is at current path or within its subgraph are received.
uuids null Only events whose associated parent node has one of the identifiers in the comma separated uuid list will be received.
nodeTypeNames null 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.
noLocal false If noLocal is true, then events generated by the session through which the listener was registered are ignored. Otherwise, they are not ignored.
sessionLiveCheckInterval 60000 Interval in milliseconds to wait before each session live checking.
sessionLiveCheckIntervalOnStart 3000 Interval in milliseconds to wait before the first session live checking.
username Camel 2.15: Allows you to specify the username as a URI parameter instead of in the authority section of the URI.
password Camel 2.15: Allows you to specify the password as a URI parameter instead of in the authority section of the URI.
workspaceName null Camel 2.16: Allows you to specify a workspace different from default.

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>