February 2023
Beginner to intermediate
482 pages
12h 58m
English
Content preview from Java in a Nutshell, 8th Edition
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Chapter 13. Platform Tools
This chapter discusses the tools that ship with the OpenJDK version of the Java platform. The tools covered are all command-line tools. If you are using a different version of Java, you may find different tools as part of your distribution but with similar function.
Later in the chapter, we devote dedicated sections to two tools: jshell, which
introduced interactive development to the Java platform, and Java Flight
Recorder (JFR) tooling for deep profiling of Java applications.
Command-Line Tools
The command-line tools we cover are the most commonly used tools and those of greatest utility—they are not a complete description of every available tool. In particular, tools concerned with CORBA and the server portion of RMI are not covered, as these modules were removed from the platform with the release of Java 11.
Note
In some cases, we need to discuss switches that take filesystem paths. As elsewhere in the book, we use Unix conventions for such cases.
Below we’ll discuss the following tools, including their basic usage, description, and common switches:
-
javac -
java -
jar -
javadoc -
jdeps -
jps -
jstat -
jstatd -
jinfo -
jstack -
jmap -
javap -
jlink -
jmod -
jcmd
Note
Options described throughout are targeted at Java 17 and may vary in older Java
versions. For example, --class-path was introduced when --module-path became
an option but won’t work on Java 8 and earlier (which require -cp or
--classpath).
javac
Basic usage
bjavac some/package ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.