Скачать или смотреть How to Build an ARM Gnueabi OpenJDK11 JRE with JMX Support

Learn how to successfully build an `ARM Gnueabi` OpenJDK11 JRE with JMX support, including troubleshooting common errors and optimizing for embedded systems.
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How to Build an ARM Gnueabi OpenJDK11 JRE with JMX Support

When working with Java on embedded devices, particularly those running on ARM architectures, integrating Java Management Extensions (JMX) support can sometimes become a challenging endeavor. If you’ve ever tried to remote debug your Java applications using tools like JStatd or JMX only to be met with frustrating errors, this guide is for you. We will walk through how to build a custom OpenJDK 11 JRE with JMX support specifically for the ARM Gnueabi platform.

Understanding the Problem

After successfully building a custom OpenJDK 11 JDK for your ARM-based target board, you might want to employ JMX for remote debugging. Unfortunately, many have encountered the error:

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This error typically appears when the Java Virtual Machine (JVM) does not have the necessary management modules required to support JMX.

Building the Custom JRE

To address the issue, it’s vital to create a custom JRE that includes all necessary modules, ensuring that the assigned environment can support JMX configuration. Below, we’ll dive into the steps needed to build this JRE effectively.

Step 1: Identify Required Modules

When constructing a JRE tailored for JMX support, make sure to include key Java modules used for management and monitoring:

java.management

java.management.rmi

jdk.management.agent

jdk.jstatd

Step 2: Use JLink

With the required modules identified, utilize the JLink tool to generate your custom JRE. The command you would execute looks something like this:

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This command does the following:

Excludes unnecessary header files and man pages, optimizing the JRE size for resource-constrained environments.

Compiles the specified modules into a single JRE output.

Step 3: Configure for ARM Client Mode

Building the JDK in "client" mode is crucial when working with limited hardware. Before you execute the make command, ensure that the build configuration specifies "client" instead of the default "minimal." This adjustment provides your JVM with the necessary support for JMX.

Step 4: Running with JMX Options

To start your Java application with JMX support, you would use the following options:

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After implementing these changes, the previous error regarding JMX support should no longer occur, allowing you to continue remote debugging your application.

Conclusion

Successfully building an ARM Gnueabi OpenJDK11 JRE with JMX support requires a keen understanding of modular requirements, along with proper configuration settings. By including essential management modules and adjusting the build configuration to utilize client mode, you will be better equipped to deploy Java applications on embedded systems with JMX capabilities.

If you encounter issues along the way, double-check the modules included in your JRE and ensure that the configuration settings are properly specified before compiling. Happy coding!