JVM automatically loads the specified javaagent

The specified javaagent method is automatically loaded when the JVM is started by accident when checking the data

The core is the  JAVA_TOOL_OPTIONS variable

Linux

export JAVA_TOOL_OPTIONS=-javaagent:/test.jar

Windows

set JAVA_TOOL_OPTIONS=-javaagent:D:/test.jar

It is recommended to set it to the environment variable, cooperate  AspectJ, can construct a big killer.

When the JVM detects that there is a setting at startup  JAVA_TOOL_OPTIONS , it will automatically  JAVA_TOOL_OPTIONS load the value as the JVM startup parameter

Reference:  https://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/envvars002.html