---
title: "Changing Gateway Java Version"
---

# Changing Gateway Java Version

> <IUCard title="Changing Gateway Java Version" link="https://inductiveuniversity.com/video/changing-gateway-java-version/7.9" />

You can change the Java version that the Gateway Service is using by editing the Ignition configuration `ignition.conf` file. Go to the **Status** page, and select the **Systems** > **Overview** section of the Gateway to view the current Java version you are running.

## To Change the Java Version

Here is how you can change the current Java version:

1. Go to the install directory and find the `ignition.conf` file. On a computer running Windows OS, this is typically found at **Program Files** > **Inductive Automation** > **Ignition** > **data**.
 
2. Open the `ignition.conf` file and scroll down to the **wrapper Java Properties** section.
 
3. Find the line of code that starts with the following:
`wrapper.java.command=`

4. Change the path to the new location of your java.exe file. If you are not sure where you have java installed, you can search your computer for "java.exe"
For example, if you see this:
`wrapper.java.command=C:/Program Files/Java64/bin/java.exe`
but your java is in the jre8 folder, then you can change it to:
`wrapper.java.command=C:/Program Files/Java/jre8/bin/java.exe`

5. Save the `ignition.conf` file.

6. Launch the [Gateway Control Utility](gateway/gateway-settings/gateway-control-utility.md) (GCU) and click **Restart** to start the Service again.

After Ignition is restarted, you can verify that the Java version is updated by going back to the **Status** page, selecting **Systems** > **Overview** to see the Java Version you are now running.

:::warning
If upgrading to Java 9, the ignition.conf file needs to be modified to comment out a specific parameter: `CMSPermGenSweepingEnabled` which is located under the **Additional Parameters** section. If the line is not commented out, then the Gateway will be unable to start.

This can be accomplished by placing a # character in front of the line, or by removing the line entirely, saving the file, and starting the service.

Note that as of Ignition version 7.9.6+, Java 9 is now officially supported. As a result, the `CMSPermGenSweepingEnabled` parameter will automatically be commented out by upgrading to Ignition 7.9.6 or greater when using Java 9.

**Java 9 is the maximum version allowed**.
:::