Learning Pentaho Data Integration 8 CE - Third Edition

Data types equivalence

The code you type inside the UDJC step is pure Java. Therefore, the fields of your Transformation will be seen as Java objects according to the following equivalence table:

Data type in PDI	Java Class
String	Java.lang.String
Integer	Java.lang.Long
Number	Java.lang.Double
Date	Java.util.Date
BigNumber	BigDecimal
Binary	byte[]

The opposite occurs when you create an object inside the Java code and want to expose it as a new field of your Transformation. For example, in the Java code, if you define a long variable in the Fields tab, you have to define the correspondent output field as Integer.