Fix for Windows, follow these steps: Create a windows regedit new DWORD Press Windows Button + R, type “regedit”, and then click OK. Navigate to the following registry subkey: HKEY_LOCAL_MACHINE > SOFTWARE > Microsoft > Windows > CurrentVersion > SideBySide Right-click, select NEW > DWORD (32 bit) Value Type PreferExternalManifest, and then press ENTER. Right-click … Read more
JDK_JAVA_OPTIONS is only picked up by the java launcher, so use it for options that you only want to apply (or only make sense for) the java startup command. This variable is also new on JDK 9+, and will be ignored by earlier JDK versions. Hence, it’s useful when migrating from older versions to 9+. … Read more
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 … Read more
You can setup _JAVA_OPTIONS instead of JAVA_OPTS. This should work without $_JAVA_OPTIONS.
Even when -Xmx and -Xms set to the same value, the space reserved for Java Heap is not immediately allocated in RAM. Operating System typically allocates physical memory lazily, only on the first access to a virtual page. So, while unused part of Java Heap is not touched, it won’t really consume memory. You may … Read more
Intellij allows you to specify two types of arguments when running a Java program: VM Options Enables you to modify attributes of the JVM, including stack/heap memory allocation, system properties, GC flags, etc. Program Arguments Values entered here are passed into the String[] parameter of your main method when the program begins. In the above … Read more
You can set the system properties programmatically using System#setProperty(). System.setProperty(“org.apache.el.parser.COERCE_TO_ZERO”, “false”); However, you need to ensure that this is been set before JSF/EL ever get initialized. Best place would be a ServletContextListener. public class Config implements ServletContextListener { @Override public void contextInitialized(ServletContextEvent event) { System.setProperty(“org.apache.el.parser.COERCE_TO_ZERO”, “false”); } @Override public void contextDestroyed(ServletContextEvent event) { // NOOP … Read more
You can set set environment variable JAVA_TOOL_OPTIONS in your OS. All Java tools (java, javac, ..) will pick this variable up and use it. So you could e.g. use SET JAVA_TOOL_OPTIONS=-Dsun.locale.formatasdefault=true I use this to force a specific locale for each JVM. But this only works if your application is started through the Java tools. … Read more
I wanted to use this for some program I hadn’t control for running that Java app so ended with this _JAVA_OPTIONS=-Djava.net.preferIPv4Stack=true environment variable. (read about _JAVA_OPTIONS here) If you are using Windows, just run this command on Windows cmd: setx _JAVA_OPTIONS -Djava.net.preferIPv4Stack=true Thanks to Jason Nichols for reminding this JVM argument 🙂
You could try specifying -XX:MinHeapFreeRatio and -XX:MaxHeapFreeRatio to control heap expansion and shrinking: -XX:MinHeapFreeRatio – when the percentage of free space in a generation falls below this value the generation will be expanded to meet this percentage. Default is 40. -XX:MaxHeapFreeRatio – when the percentage of free space in a generation exceeded this value the … Read more