# Java configuration

## Checking the Java used

### Server Components

To check the Java version used by the Jobserver you can open the **wrapper.log** found under the **logs** folder under the Jobserver folder, and see the following lines:

```
WARNING|wrapper|24-01-31 16:29:16|YAJSW: yajsw-stable-12.13a
WARNING|wrapper|24-01-31 16:29:16|OS   : Windows 10/10.0/amd64
WARNING|wrapper|24-01-31 16:29:16|JVM  : Oracle Corporation/11.0.7/C:\Program Files\RedHat\java-11-openjdk-11.0.7-1/64
```

### Web Client

To check the Java version used by the Web Client you can open the [About ](https://docs.migration-center.com/24.1/webclient-user-guide#about)section:

<figure><img src="https://2258031339-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FVAjDGRjLPJnEZAFwxCrw%2Fuploads%2FGTXTSk2Xbk3n7YUvlxND%2Fimage.png?alt=media&#x26;token=b71cfcf1-dbf7-4054-b322-d345bb7ac897" alt=""><figcaption><p>Web Client About Section</p></figcaption></figure>

## Changing the Java used

When you need to change the **Java** installation on a machine with the **Jobserver** and **WebClient** **already installed**, the services for each component must be configured to use the new java.

### Server Components

Set the **JAVA\_HOME** (for JDK) or **JRE\_HOME** (for JRE) to point to the new Java installation folder.

{% hint style="warning" %}
First ensure there are no running jobs on the Jobserver
{% endhint %}

Go to the Server Components folder (default is **C:\Program Files (x86)\fme AG\migration-center Server Components x.xx**) and run the following two scripts in order using **Run as Administrator**:

1. **UninstallWinNTService.bat**
2. **InstallAsWinNTService.bat**

Then ensure the server is started again with the appropriate credentials if needed.

### Web Client

Go to the **C:\Program Files (x86)\fme AG\migration-center Web Client\bin** folder and open the **McWebClientw\.exe** file.

On the **Java** tab edit the **Java Virtual Machine** field to point to the **jvm.dll** file under your new Java install. In some java versions it's directly under `bin\server\jvm.dll` while in others it's under `\jre\bin\server\jvm.dll`. Here's an example on how the path should look:

`C:\Program Files\Java\OpenJDK\jdk-8.402\jre\bin\server\jvm.dll`

After setting this **restart the WebClient service** using the Windows Services window.