Static code and static variables.

Within a static block, you can declare static variables and static code. All instances of a reusable Java transformation in a mapping

and all partitions in a session

share static code and variables. Static code runs before any other code in a Java transformation.

For example, the following code declares a static variable to store the error threshold for all instances of a Java transformation in a mapping:

Use this variable to store the error threshold for the transformation and access it from all instances of the Java transformation in a mapping

and from any partition in a session

.

Instance variables.

You can declare partition-level instance variables.

Multiple instances of a reusable Java transformation in a mapping

or multiple partitions in a session

do not share instance variables. Declare instance variables with a prefix to avoid conflicts and initialize non-primitive instance variables.

For example, the following code uses a boolean variable to decide whether to generate an output row:

User-defined static or instance methods.

Extends the functionality of the Java transformation. Java methods declared on the

Helper Code

tab can use or modify output variables or locally declared instance variables. You cannot access input variables from Java methods on the

Helper Code

tab.

For example, use the following code on the tab to declare a function that adds two integers: