# Capturing Traffic from Java Applications

The Java Virtual Machine (JVM) has its proxy configuration settings. How can I export the Fiddler root CA (certificate authority) for handling HTTPS traffic and set up the JVM to respect the Fiddler proxy?

## Solution

1. [Export the Fiddler Everywhere root CA](https://www.telerik.com/fiddler/fiddler-everywhere/documentation/user-guide/settings/https).
2. Create a JVM keystore by using the exported certificate and [the keytool application](https://docs.oracle.com/javase/8/docs/technotes/tools/unix/keytool.html). Note that you will need admin access rights to use the keytool application. The following command prompts you to create a password and outputs `FiddlerKeystoreFile` in the pre-set export path.
   ```Java
   %JAVA_HOME%\bin\keytool.exe -import -file <path-to-exported-CA>\Fiddler_Root_Certificate_Authority.crt -keystore <your-export-path>\FiddlerKeystoreFile -alias Fiddler
   ```
3. Configure the java application to use the Fiddler proxy and certificate through `jre`.
   ```sh
   jre -DproxySet=true -DproxyHost=127.0.0.1 -DproxyPort=8866 -Djavax.net.ssl.trustStore=<your-export-path>\FiddlerKeystoreFile -Djavax.net.ssl.trustStorePassword=<Keystore Password>
   ```