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title: Troubleshooting Java Module
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# Troubleshooting Java Module

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

To troubleshoot Java module, become familiar with the information about enabling verbose logging and
interpreting commonly thrown messages.

## Enable Verbose Logging

To get a better understanding of why an application’s interaction with the Java module is failing,
temporarily enable verbose logging for the module.

Remember to always disable the enhanced verbosity after troubleshooting, because it affects your
Mule application performance.

To enable verbose logging in the configuration file:

1.  In Anypoint Studio, navigate to the **Package Explorer** view.

2.  Open your application’s project name.

3.  Open the `src/main/resources` path folder.

4.  Open the `log4j2.xml` file inside the folder.

5.  Add an `<AsyncLogger>` tag inside the `<Loggers>` tag:

    ```xml
    			<Loggers>
    				...
    				<AsyncLogger name="org.mule.extensions.java" level="DEBUG"/>
    				...
    			</Loggers>
    ```

6.  Save your application changes.

7.  In Anypoint Studio, click the project name in **Package Explorer** and then click **Run** >
    **Run As** > **Mule Application**. .

## Understand Common Throws

Here is a list of common throw messages and how to interpret them:

- JAVA:ARGUMENTS\_MISMATCH

Any of the arguments is either of the wrong type or missing, or there were too many arguments
provided.

- JAVA:CLASS\_NOT\_FOUND

A definition could not be found for the class with the specified name.

- JAVA:INVOCATION

An error occurred during the invocation of a method or constructor.

- JAVA:NO\_SUCH\_METHOD

The specified method cannot be found.

- JAVA:WRONG\_INSTANCE\_CLASS

The class of the given instance does not match with the expected class.

- JAVA:NO\_SUCH\_CONSTRUCTOR

The class doesn’t have a matching constructor, or it is not visible.

- JAVA:NOT\_INSTANTIABLE\_TYPE

The supplied class is either abstract or interface.

## See Also

- [Java Module Reference](https://docs.mulesoft.com/java-module/latest/java-reference)

- [Salesforce Help](https://help.salesforce.com)

- [Known Issues](https://help.salesforce.com/s/issues)