> For the complete documentation index, see [llms.txt](https://boomi.markusschmidt.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://boomi.markusschmidt.pro/boomi-scriptease/examples/1-debug-an-existing-process-script.md). # 1 - Debug an existing process script We are creating a new, empty script file in our project. Then we copy and paste the code of an existing process script into the file. We create a Test to host the script, and we debug the existing script with IntelliJ. Right click on *training* and select ***New -> Package***, aka: new folder.

create a new package

Call the package: `training.example01` . Right click on `example01`\` and add a new, blank Groovy Script. Call it `psgNull` - null: it does nothing, no functionality!
Goto to **Boomi Integration** and create a new Process Script, call it `psgNull`

Boomi Integration - Process Script with Null functionality

```groovy import java.util.Properties; import java.io.InputStream; for( int i = 0; i < dataContext.getDataCount(); i++ ) { InputStream is = dataContext.getStream(i); Properties props = dataContext.getProperties(i); dataContext.storeStream(is, props); } ``` Copy the code and paste it into the `psgNull.groovy` file.

psgNull pasted into IntelliJ, with warnings

{% hint style="info" %} IntelliJ gives us some warnings (yellow bars to the right): *Unused Imports* and *Unnecessary Semicolon* - fix it, or leave it. Just to mention here that you eventually want to read and recognize what IntelliJ tells you. {% endhint %} Set a breakpoint on line 8, we want to stop there:

Null script with breakpoint

Now, we want to debug that script, and we **need a Test as a host** to run the process script locally. ### Create Test class from template Right click on the `example01` folder select ***New -> Boomi Process Script Test*** and provide the Map-Script name (from above: *psgNull*) without *psg*:

Create a test from a template: the test needs the name of the script.

{% hint style="info" %} **Tip!** The *MyScripts* IntelliJ project comes with [four pre-configured templates](/boomi-scriptease/knowlede-base/process-script-templates.md), to create new Tests and Scripts. If you have > ***Project Files** Bar -> Options (three dots)*\ > *-> Appearance -> View Excluded Files* enabled, you will see the files in the project directory under `.idea\fileTemplates`.\ More information on that topic in the [IntelliJ Help](https://www.jetbrains.com/help/idea/settings-file-and-code-templates.html). {% endhint %} Open the created `Test_Null`, click the green arrow and *Debug* method ***test01()**.*
The code execution is going to halt in the debugger in our Boomi Script `psgNull.groovy`on line 8.

Haltet script

Select `dataContext.getDataCount()`, right click and *Evaluate Expression...* to see the data: `value = 1`. Big question: A value of 1 means, the script has got *one* document! The question is, where did it come from?