Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize

Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize

The error message "Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize" typically occurs when you are using a Java version that is 8 or later. In Java 8 and later, the "PermGen" space (Permanent Generation) was removed, and the "MaxPermSize" option is no longer recognized.

In previous Java versions (Java 7 and earlier), you could allocate a fixed amount of memory to the PermGen space using the "MaxPermSize" option. However, in Java 8 and later, this space was replaced by the "Metaspace," which is more flexible and does not require a fixed size allocation.

To resolve this warning:

  1. Remove the -XX:MaxPermSize Option: If you are using Java 8 or later, remove the "-XX:MaxPermSize" option from your Java command line or configuration. It is no longer valid and will be ignored.

  2. Upgrade to a More Recent Java Version: If you are using an older Java version (e.g., Java 7 or earlier) and you want to migrate to a newer version (Java 8 or later), you should update your code and configuration to be compatible with the new memory management model. This typically involves removing references to PermGen and adjusting memory settings as needed.

  3. Review Memory Settings: Instead of "PermGen" settings, you can use memory-related options like "-Xmx" (maximum heap size) and "-Xms" (initial heap size) to control the memory allocation for your Java application. These settings are still applicable in Java 8 and later.

For example, you can set the maximum heap size to 512MB and the initial heap size to 256MB like this:

java -Xmx512m -Xms256m -jar your-application.jar

Make sure to adjust the memory settings according to the requirements of your application.

Keep in mind that Java versions may change over time, so it's essential to review the documentation and compatibility notes for the specific Java version you are using.

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