Many flavors of Java exist and also many versions of each flavor.
If you want to just run a specific application, check the documentation of that software to see what versions of Java are supported or have been tested.
Most Java applications run on one of the following:
* Run the following command to list available versions:
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dnf search openjdk
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* Copy the version of OpenJDK you want to install.
[NOTE]
Various flavors of OpenJDK are available. For information about these options, search the link:https://openjdk.java.net/[OpenJDK web site].
* Run the following command to install OpenJDK:
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sudo dnf install <openjdk-package-name>
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Examples:
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sudo dnf install java-1.8.0-openjdk.x86_64
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sudo dnf install java-11-openjdk.x86_64
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sudo dnf install java-latest-openjdk.x86_64
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=== Installing OpenJDK for development
In order to install the Java Development Kit, runtime environment and associated development tools.
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sudo dnf install <openjdk-package-name>-devel
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Examples:
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sudo dnf install java-1.8.0-openjdk-devel.x86_64
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sudo dnf install java-11-openjdk-devel.x86_64
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sudo dnf install java-latest-openjdk-devel.x86_64
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== Installing Oracle Java SE
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To install Oracle Java SE:
. Navigate to link:https://www.oracle.com/java/technologies/javase-downloads.html[Oracle Java SE downloads page], and choose the version of Java you wish to use.
. Accept the license agreement and download the appropriate tar.gz file for your systems architecture.
. Unpack the tar.gz file somewhere.
For example, to extract it to the _/opt_ directory:
`sudo tar xf Downloads/jdk-18_linux-x64_bin.tar.gz -C /opt`
. Set the _JAVA_HOME_ environment variable to that directory.
The JDK has as its primary components a collection of programming tools, including:
`appletviewer`:: this tool can be used to run and debug Java applets without a web browser
`apt`:: the annotation-processing tool
`extcheck`:: a utility which can detect JAR-file conflicts
`idlj`:: the IDL-to-Java compiler. This utility generates Java bindings from a given Java IDL file.
`jabswitch`:: the Java Access Bridge. Exposes assistive technologies on Microsoft Windows systems.
`java`:: the loader for Java applications. This tool is an interpreter and can interpret the class files generated by the javac compiler. Now a single launcher is used for both development and deployment. The old deployment launcher, jre, no longer comes with Sun JDK, and instead it has been replaced by this new java loader.
`javac`:: the Java compiler, which converts source code into Java bytecode
`javadoc`:: the documentation generator, which automatically generates documentation from source code comments
`jar`:: the archiver, which packages related class libraries into a single JAR file. This tool also helps manage JAR files.
`javafxpackager`:: tool to package and sign JavaFX applications
`jarsigner`:: the jar signing and verification tool
`javah`:: the C header and stub generator, used to write native methods
`javap`:: the class file disassembler
`javaws`:: the Java Web Start launcher for JNLP applications
`JConsole`:: Java Monitoring and Management Console
`jdb`:: the debugger
`jhat`:: Java Heap Analysis Tool (experimental)
`jinfo`:: This utility gets configuration information from a running Java process or crash dump. (experimental)
`jmap`:: This utility outputs the memory map for Java and can print shared object memory maps or heap memory details of a given process or core dump. (experimental)
`jmc`:: Java Mission Control
`jps`:: Java Virtual Machine Process Status Tool lists the instrumented HotSpot Java Virtual Machines (JVMs) on the target system. (experimental)
`jrunscript`:: Java command-line script shell.
`jstack`:: utility which prints Java stack traces of Java threads (experimental)
`policytool`:: the policy creation and management tool, which can determine policy for a Java runtime, specifying which permissions are available for code from various sources
`VisualVM`:: visual tool integrating several command-line JDK tools and lightweight clarification needed] performance and memory profiling capabilities
`wsimport`:: generates portable JAX-WS artifacts for invoking a web service.
`xjc`:: Part of the Java API for XML Binding (JAXB) API. It accepts an XML schema and generates Java classes.
The JDK also comes with a complete Java Runtime Environment, usually called a private runtime, due to the fact that it is separated from the "regular" JRE and has extra contents. It consists of a Java Virtual Machine and all of the class libraries present in the production environment, as well as additional libraries only useful to developers, such as the internationalization libraries and the IDL libraries.
