Duplicated Java runtime options : what is the order of preference?

by

As always, check your local JVM’s specific implementation but here is a quick way to check from the command line without having to code.

> java -version; java -Xmx1G -XX:+PrintFlagsFinal -Xmx2G 2>/dev/null | grep MaxHeapSize

java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)
uintx MaxHeapSize         := 2147483648        {product}

So you’ll see in this case, the second instance of the argument (2G) is what takes precedence (at least in 1.8) and that has been my experience with most other modern versions as well.

More Related Contents:

  1. How to get VM arguments from inside of Java application?
  2. Difference between _JAVA_OPTIONS, JAVA_TOOL_OPTIONS and JAVA_OPTS
  3. Java stack overflow error – how to increase the stack size in Eclipse?
  4. What does JVM flag CMSClassUnloadingEnabled actually do?
  5. Debug a java application without starting the JVM with debug arguments
  6. Increasing the JVM maximum heap size for memory intensive applications
  7. What does -XX:MaxPermSize do?
  8. “Error occurred during initialization of VM; Could not reserve enough space for object heap” using -Xmx3G
  9. What is the largest possible heap size with a 64-bit JVM?
  10. Java Exceptions counter on JVM HotSpot
  11. Encourage the JVM to GC rather than grow the heap?
  12. How can I disable IPv6 stack use for IPv4 IPs on JRE?
  13. Java heap Xms and linux free memory different
  14. What is the difference between JDK_JAVA_OPTIONS and JAVA_TOOL_OPTIONS when using Java 11?
  15. What are the -Xms and -Xmx parameters when starting JVM?
  16. PermGen elimination in JDK 8
  17. Why would you ever implement finalize()?
  18. Android Studio Gradle project “Unable to start the daemon process /initialization of VM”
  19. Can Java 8 code be compiled to run on Java 7 JVM?
  20. Java heap terminology: young, old and permanent generations?
  21. java.lang.OutOfMemoryError: PermGen space [closed]
  22. Find out what JVM Eclipse is running on
  23. Is there one JVM per Java application?
  24. Read Java JVM startup parameters (eg -Xmx)
  25. Can the JVM max heap size be dynamic?
  26. Maximum number of parameters in Java method declaration
  27. Differences between Just in Time compilation and On Stack Replacement
  28. If I compiled a Java file with the newest JDK, would an older JVM be able to run the .class files?
  29. Java for-loop optimization
  30. Release java memory for OS at runtime

Leave a Comment