CODEWITHSUNDEEP
javajvm
Kilian
Kilian

Reputation: 1939

Are args[] available througout the entire jvm lifecycle?

Java vm arguments can be retrieved at an later point in time by calling: 

ManagementFactory.getRuntimeMXBean().getInputArguments()

This call explicitly excludes the main args

Returns the input arguments passed to the Java virtual machine which does not include the arguments to the main method

Is it safe to assume that supplying an argument via the command line is wiped from memory once the main method exists, or can we clean up safely afterwards ourselves? (In this particular example I want the user to supply an encryption/decryption key) which should stay in memory as short as possible.

Upvotes: 0

Views: 75

Answers (1)

apangin
apangin

Reputation: 98284

Is it safe to assume that supplying an argument via the command line is wiped from memory once the main method exists

Definitely NOT.

Command line is an attribute of OS process. No matter what JVM or what application you start, the original command line is kept by the OS as long as the process lives. E.g. on Linux it is accessible through /proc/PID/cmdline.

Upvotes: 1

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