CODEWITHSUNDEEP
javajarjvm
TwentyMiles
TwentyMiles

Reputation: 4089

When does Java's JVM unzip jar files?

Java's jar file format builds off of the zip file format, and supports compression of the class files inside it. When and how does the JVM decide which class files to uncompress and pull out of the jars on its classpath? Is the process dynamic and done at runtime as classes are needed, or are they all uncompressed up front before the program actually runs?

Upvotes: 6

Views: 698

Answers (1)

Ingo
Ingo

Reputation: 36349

Is the process dynamic and done at runtime as classes are needed

Yes. You can log the activity of the class loader as follows (in the terminal):

java -verbose:class [ your other flags and arguments... ]

Upvotes: 5

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