--- schema_version: "1" id: 577dd749bf62f08a360f323e80f9c8cf5bc168d5e965490efad5535a9b3f6b8b title: Hardware and Software Requirements for On-Premises Mule Runtime Engine collection: mulesoft version: current locale: en-us portal_url: https://docs.salesforce.com/mulesoft/current/en-us/on-premises/4.3/hardware-and-software-requirements.md canonical_url: https://docs.mulesoft.com/on-premises/4.3/hardware-and-software-requirements source_site: docs.mulesoft.com content_type: documentation content_hash: 4a6e96a5ed5ec2041730593722d2f0e6feadc6601e7d9be022bff03527c0d24c description: MuleSoft Documentation Site release: "4.3" latest: false --- --- product: On-premises Runtimes version: 4.3 keywords: RHEL, Red Hat, Rocky Linux, Ubuntu, Windows Server, supported versions, sizing, RAM, heap, CPU, on-premises, on-prem, standalone, JDK 1.8, JDK 11 --- # Hardware and Software Requirements for On-Premises Mule Runtime Engine > For the full documentation index, see: https://docs.mulesoft.com/llms.txt Confirm these requirements before you download on-premises runtime. This is the Prerequisites stage in [On-Premises Runtimes Overview](https://docs.mulesoft.com/on-premises/4.3/). After the host meets them, download Mule Enterprise Edition. See [Download, Install, Configure, and Upgrade On-Premises Mule Runtime Engine](https://docs.mulesoft.com/on-premises/4.3/runtime-installation-task). ## Review Minimum Hardware Requirements The CloudHub vCore sizing model does not apply to on-premises Mule runtime engine 4.3. You size CPU, heap, and RAM on the host yourself. - 2 GHz CPU or 1 virtual CPU in virtualized environments. - 1 GB of RAM. - 4 GB of storage. Adjust RAM to match your latency requirements and the size and number of simultaneous messages that applications process. ## Use a Supported Java Version Verify that you use a supported version of Java before you install Mule runtime engine. Mule runtime engine 4.3 requires JDK 1.8 or JDK 11. Mule runtime engine 4.3 does not support JDK 17.
SoftwareVersion

JDK

JDK 1.8.0 or JDK 11

> [!NOTE] Though you can run a different JDK of choice, MuleSoft doesn’t support or take action to > fix issues if they are traced back to the JDK. ## Review Supported Operating Systems Mule runtime engine 4.3 is supported on any operating system that runs a Java Runtime Environment (JRE) from a supported JDK. Red Hat Enterprise Linux (RHEL) is a tested distribution. MuleSoft supports RHEL clones such as Rocky Linux even when a specific clone version is not listed as tested. ### Review Tested Software Mule runtime engine 4.3 passed functional testing against the following software and operating systems:
SoftwareVersion

OS

MacOS 10.15, HP-UX 11i V3, AIX 7.2, Windows Server 2019, Windows 10, Solaris 11.3, RHEL 8, Ubuntu Server 20.04

JDK

Adoptium OpenJDK distribution

Mule runtime engine 4.3 is bundled with the Runtime Manager agent plugin version 2.4.5. For Runtime Manager Agent compatibility, see [Runtime Manager Agent Release Notes](https://docs.mulesoft.com/release-notes/runtime-manager-agent/runtime-manager-agent-release-notes). ## Troubleshoot Common Error Messages ### `Unsupported class file major version 61` This error means bytecode compiled for Java 17 (class file major version 61) was loaded by an older JDK, or Mule runtime engine 4.3 is running on an unsupported JDK. Mule runtime engine 4.3 requires JDK 1.8 or JDK 11. Mule runtime engine 4.3 does not support JDK 17. ### `JavaVersionNotSupportedByExtensionException` An extension, connector, or module such as APIkit does not support the JDK that on-premises Mule runtime engine 4.3 is running. Mule runtime engine 4.3 requires JDK 1.8 or JDK 11. Mule runtime engine 4.3 does not support JDK 17. Align the application’s Java compatibility with that JDK, or run a JDK the extension lists as supported. ### `OutOfMemoryError: Metaspace` The JVM that hosts on-premises Mule runtime engine 4.3 ran out of Metaspace. Increase Metaspace in the Java Service Wrapper (`wrapper.conf`) rather than only increasing heap. Heap and Metaspace are separate pools. ## See Also - [On-Premises Runtimes Overview](https://docs.mulesoft.com/on-premises/4.3/) - [Download, Install, Configure, and Upgrade On-Premises Mule Runtime Engine](https://docs.mulesoft.com/on-premises/4.3/runtime-installation-task) - [Java Support](https://docs.mulesoft.com/general/java-support#mule-runtime-java-support) - [Hybrid Standalone Runtimes](https://docs.mulesoft.com/hybrid-standalone/)