# Java VMs

In order to intercept HTTPS traffic from Java apps, it requires extra steps to install Proxyman CA Certificate into Java Key Store.

* Intercept Traffic from Unit Test (written by Java or Kotlin)
* Intercept Traffic from Java app or CLI

### 1. Install Proxyman CA on macOS machine

Before installing Proxyman CA on Java VMs, we have to install properly on your current mac machine.

Check out macOS Guideline:

{% content-ref url="/pages/-LlQ11LV9KVIfRygaCPn" %}
[macOS](/~/revisions/CTFzuwrlmsieJaiDVRDD/debug-devices/macos.md)
{% endcontent-ref %}

If you've done this step, you can skip and start the next step.

### 2. Install Proxyman CA to all Java Key Stores

* Certificate Menu -> Install Certificate on Java VMs

![](/files/7pmGiHRc7yk79H3cIOW3)

* The script will attempt to find the Key Store location from **JAVA\_HOME** environment and install the CA Certificate if possible

![](/files/-MENQX1vwFIYCATdY2T5)

{% hint style="info" %}
You can find the script at /Applications/Proxyman.app/Contents/Frameworks/ProxymanCore.framework/Versions/A/Resources/install-certificates-java.sh
{% endhint %}

{% hint style="info" %}
The script might require permission for EventKit because Proxyman triggers the script by [Apple Script](https://developer.apple.com/library/archive/documentation/AppleScript/Conceptual/AppleScriptLangGuide/introduction/ASLR_intro.html) in order to install under admin permission.
{% endhint %}

### Alternative solution

* Check out @[**yauheniprakapenka**](https://github.com/yauheniprakapenka) solution: <https://github.com/ProxymanApp/Proxyman/issues/569#issuecomment-723588490> if you get the following error&#x20;

`sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target`


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