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Security

CheerpJ executes Java applications entirely within the browser using standard web technologies.

It follows the browser security model by design. There is no local JVM, no plugins, and no direct access to the host system.

Request a security assessment

Execution Model

CheerpJ runs entirely in the web browser using standard web technologies.

  • Java applications execute via a combination of WebAssembly and JavaScript
  • Includes a Java Virtual Machine and Runtime Environment in the browser
  • Deploys applications from standard .jar files
  • No client-side JVM or plugin installation is required

This model removes the need for local Java installations and associated plugin risks

Security Benefits

  • No client-side Java runtime
  • No plugin-based execution
  • Supports zero-trust architectures
  • Supports thin clients and mobile access

These characteristics improve the overall security posture of Java application delivery

Network Model

CheerpJ follows the standard web browser networking model.

  • Cross-origin restrictions apply
  • Supports HTTP(S) by default. Support for TCP requires an additional proxy component.

All network access is governed by the browser security model

Limitations

Browser security constraints apply

  • No direct OS-level access
  • Networking is restricted by browser policies

These constraints are part of the browser execution model and should be considered during architecture design

Isolation

CheerpJ relies on browser-level isolation.

  • Runs fully inside the browser sandbox
  • Isolated from the local system

This ensures that Java applications execute in a contained environment with no direct system exposure

Security Assessment

Not sure about your application?

Confirm security for your application.

Submit your application details, and our engineering team will provide a compatibility assessment.

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