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title: Using Utility Classes From a Test
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---
product: MUnit
version: 2.3
---
# Using Utility Classes From a Test
> For the full documentation index, see: https://docs.mulesoft.com/llms.txt
When developing test cases, you might want to use custom Java classes located in `src/test/java`.
You can use Java classes through DataWeave or through Java Module.
When using custom classes, the package of the class must be exported in the `mule-artifact.json`
file:
```json
{
"minMuleVersion": "4.x.x",
"classLoaderModelLoaderDescriptor": {
"id": "mule",
"attributes": {
"exportedPackages": ["com.example.test"]
}
}
}
```
For example, assume that you want to use in an MUnit test a `MyUtilClass.java` class located in
`src/test/java/com/example/`:
MyUtilClass
```java
package com.example.test;
public class Helper {
public static long getCurrentMillis() {
return System.currentTimeMillis();
}
}
```
## Invoke Your Java Class Using DataWeave
To invoke static methods using DataWeave you must add the `java!` prefix to the package name of the
class:
Use a class in DataWeave
```xml
```
## Invoke Your Java Class Using Java Module
To invoke a custom Java class using Java Module:
1. Ensure that Java Module is in your project:
Java Module dependency
```xml
org.mule.module
mule-java-module
${javaModule.version}
mule-plugin
test
```
2. Use any of the Java Module’s operations.
For this example, invoke a static method of a class:
Use a class with the Java Module
```xml
```