Not able to enable Native memory tracking in a spring boot application

user_1835884 0
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I am trying to enable NMT in my spring boot application like this

 java -jar -Dlogging.config=log4j2.xml -XX:NativeMemoryTracking=summary application.jar

However, I get a warning 

Java HotSpot(TM) 64-Bit Server VM warning: Native Memory Tracking did not setup properly, using wrong launcher?

How can I enable NMT for an application running on embedded tomcat?

spring-boot jvm memory-leaks java
2 Answers

Change the order of arguments:

java -XX:NativeMemoryTracking=summary -Dlogging.config=log4j2.xml -jar application.jar

This is a pecularity of java launcher. -XX:NativeMemoryTracking must be handled both by the launcher and by the JVM in order to take effect. However, the launcher stops processing arguments as soon as it sees a terminal option. -jar is one them.

user_34484190

If you run one JVM per environment (e.g. in container), JAVA_TOOL_OPTIONS is the place for flags:

JAVA_TOOL_OPTIONS=-XX:NativeMemoryTracking=summary -Dlogging.config=log4j2.xml java -jar application.jar

user_103136560
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