Wrapping POJO Classes with Mashups

Mashups in EMML : Advanced Mashup Techniques : Wrapping POJO Classes with Mashups

Using Java Classes in a <script> Statement

You can use any Java class accessible to the Presto Server within the mashup <script> statement using JavaScript. Because of this feature, you can easily use POJO classes as Presto mashables by wrapping them in mashup scripts.

Note:

Based on the JDK version used with the application server that hosts the Presto Server, Java language classes are also available within mashup <script> statements.

To wrap POJO classes in mashup scripts

1. Include the POJO classes in the Presto Server classpath by copying the compiled class file or JAR file to one of these folders:

The external configuration folder, if any, for the Presto Server. See Setting Up an External Presto Configuration Folder for more information.

Important:

Deploying additional resources, such as custom XPath classes, to an external configuration folder simplifies future deployments or Presto Server clusters.

web-apps-home/presto/WEB-INF/classes. This is the default location, but is not recommended as it complicates Presto Server deployments.

web-apps-home/presto/WEB-INF/lib. This is the default location, but is not recommended as it complicates Presto Server deployments.

2. Create a separate wrapper mashup script for each POJO method that you want to expose as a Presto mashable information source.

3. In the wrapper mashup script:

Add <input> declarations, if needed, to accept input parameters for the Java method and an <output> declaration to receive the method return, if any.

Add a <script> statement to invoke the Java code. See Using Java Classes in a <script> Statement for instructions and examples.

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