2017-10-26 21:20:01 +00:00
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= JDK on Fedora
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'''
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2017-10-27 20:44:00 +00:00
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[IMPORTANT]
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2017-10-26 21:20:01 +00:00
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======
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This page was automatically converted from https://fedoraproject.org/wiki/JDK_on_Fedora
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It is probably
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* Badly formatted
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* Missing graphics and tables that do not covert well from mediawiki
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* Out-of-date
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* In need of other love
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Please fix it, remove this notice, and then add to `_topic_map.yml`
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Pull requests accepted at https://pagure.io/fedora-docs/fedora-howto
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Once that is live, go to the original wiki page and add an `{{old}}`
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tag, followed by a note like
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....
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{{admon/note|This page has a new home!|
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This wiki page is no longer maintained. Please find the up-to-date
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version at: https://docs.fedoraproject.org/whatever-the-url
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}}
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....
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======
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'''
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[[abstract]]
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Abstract
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~~~~~~~~
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This page provides information about *JDK* installations on Fedora. (See
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also https://fedoraproject.org/wiki/Java[Java].)
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This page will discuss mainly about Open JDK and Oracle JDK, how to
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install them, test and configure them on Fedora.
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[[what-is-jdk]]
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What is JDK
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~~~~~~~~~~~
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JDK or Java Development Kit is an implementation of Java Environment,
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Standard Edition and is required for Java development purposes.
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[[openjdk-and-project-icedtea]]
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OpenJDK and project IcedTea
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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OpenJDK (Open Java Development Kit) is a free and open source
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implementation of the Java Platform, Standard Edition (Java SE). It is
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the result of an effort Sun Microsystems began in 2006. The
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implementation is licensed under the GNU General Public License (GNU
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GPL) with a linking exception. Were it not for the GPL linking
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exception, components that linked to the Java class library would be
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subject to the terms of the GPL license. OpenJDK is the official Java SE
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7 reference implementation. Fedora has shipped OpenJDK as default JRE
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implementation. It's based on Sun Microsystem's/Oracle's
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http://en.wikipedia.org/wiki/JavaOne[JavaOne] open source release and
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complemented by Red Hat's http://en.wikipedia.org/wiki/IcedTea[IcedTea]
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project that implements the missing third party components that
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Sun/Oracle could not release under free License.
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About the installation, see
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https://developer.fedoraproject.org/tech/languages/java/java-installation.html[Developer.FedoraProject.Org/Java].
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OpenJDK's *java.library.path*, shared librarary paths for i386 are:
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....
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/usr/lib
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/usr/lib/jvm/java-1.?.0-openjdk-1.6.0.0.x86_64/jre/lib/
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....
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and for x86_64:
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....
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/usr/lib64
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/usr/lib/jvm/java-1.?.0-openjdk-1.6.0.0.x86_64/jre/lib/amd64/
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....
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The JDK has as its primary components a collection of programming tools,
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including:
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[[jdk-components]]
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JDK components
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~~~~~~~~~~~~~~
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appletviewer – this tool can be used to run and debug Java applets
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without a web browser +
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apt – the annotation-processing tool +
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extcheck – a utility which can detect JAR-file conflicts +
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idlj – the IDL-to-Java compiler. This utility generates Java bindings
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from a given Java IDL file. +
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jabswitch – the Java Access Bridge. Exposes assistive technologies on
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Microsoft Windows systems. +
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java – the loader for Java applications. This tool is an interpreter and
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can interpret the class files generated by the javac compiler. Now a
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single launcher is used for both development and deployment. The old
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deployment launcher, jre, no longer comes with Sun JDK, and instead it
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has been replaced by this new java loader. +
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javac – the Java compiler, which converts source code into Java
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bytecode +
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javadoc – the documentation generator, which automatically generates
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documentation from source code comments +
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jar – the archiver, which packages related class libraries into a single
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JAR file. This tool also helps manage JAR files. +
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javafxpackager – tool to package and sign JavaFX applications +
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jarsigner – the jar signing and verification tool +
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javah – the C header and stub generator, used to write native methods +
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javap – the class file disassembler +
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javaws – the Java Web Start launcher for JNLP applications +
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JConsole – Java Monitoring and Management Console +
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jdb – the debugger +
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jhat – Java Heap Analysis Tool (experimental) +
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jinfo – This utility gets configuration information from a running Java
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process or crash dump. (experimental) +
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jmap – This utility outputs the memory map for Java and can print shared
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object memory maps or heap memory details of a given process or core
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dump. (experimental) +
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jmc – Java Mission Control +
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jps – Java Virtual Machine Process Status Tool lists the instrumented
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HotSpot Java Virtual Machines (JVMs) on the target system.
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(experimental) +
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jrunscript – Java command-line script shell. +
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jstack – utility which prints Java stack traces of Java threads
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(experimental) +
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jstat – Java Virtual Machine statistics monitoring tool (experimental) +
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jstatd – jstat daemon (experimental) +
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keytool – tool for manipulating the keystore +
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pack200 – JAR compression tool +
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policytool – the policy creation and management tool, which can
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determine policy for a Java runtime, specifying which permissions are
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available for code from various sources VisualVM – visual tool
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integrating several command-line JDK tools and lightweight clarification
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needed] performance and memory profiling capabilities +
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wsimport – generates portable JAX-WS artifacts for invoking a web
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service. +
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xjc – Part of the Java API for XML Binding (JAXB) API. It accepts an XML
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schema and generates Java classes. +
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Experimental tools may not be available in future versions of the JDK.
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The JDK also comes with a complete Java Runtime Environment, usually
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called a private runtime, due to the fact that it is separated from the
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"regular" JRE and has extra contents. It consists of a Java Virtual
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Machine and all of the class libraries present in the production
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environment, as well as additional libraries only useful to developers,
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such as the internationalization libraries and the IDL libraries.
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Copies of the JDK also include a wide selection of example programs
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demonstrating the use of almost all portions of the Java API. OpenJDK
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package name on Fedora is _java-1.?.0-openjdk_.
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[[oracle-jdk]]
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Oracle JDK
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~~~~~~~~~~
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Oracle provides JDK (Java Development Kit) for Java Developers. It
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includes a complete JRE plus tools for developing, debugging, and
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monitoring Java applications.
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[[installing-oracle-jdk-on-fedora]]
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Installing Oracle JDK on Fedora
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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\1. Download the Oracle Java JDK
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http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html[here] +
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Note: download appropriate file, for example if your system is x64
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Fedora the download file is named like this: jdk-8u45-linux-x64.tar.gz +
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2. Create a folder named java in /usr/local/by this command:
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....
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sudo mkdir -p /usr/local/java
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....
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folder is created in root/usr/local/java +
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3. Copy the Downloaded file in the directory /usr/local/java. To do
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this, cd into directory where downloaded file is located and use this
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command for copying that file to /usr/local/java/:
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....
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sudo cp -r jdk-8u40-linux-x64.tar.gz /usr/local/java
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....
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\4. CD into /usr/local/java/ directory and extract that copied file by
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using this command:
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....
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sudo tar xvzf jdk-8u45-linux-x64.tar.gz
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....
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\5. After extraction you must see a folder named jdk1.8.0_45. +
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6. Update PATH file by opening /etc/profile file by the command
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....
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sudo nano /etc/profile and paste the following at the end of the file:
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JAVA_HOME=/usr/local/java/jdk1.8.0_45
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PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
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export JAVA_HOME
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export PATH
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....
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> 7. Save and exit. +
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8. Tell the system that the new Oracle Java version is available by the
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following commands:
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....
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sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jdk1.8.0_45/bin/java" 1
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sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk1.8.0_45/bin/javac" 1
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sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/local/java/jdk1.8.0_45/bin/javaws" 1
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....
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\9. Make Oracle Java JDK as default by this following commands:
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sudo update-alternatives --set java /usr/local/java/jdk1.8.0_45/bin/java
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sudo update-alternatives --set javac /usr/local/java/jdk1.8.0_45/bin/javac
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sudo update-alternatives --set javaws /usr/local/java/jdk1.8.0_45/bin/javaws
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....
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\10. Reload sytem wide PATH /etc/profile by this command:
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....
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source /etc/profile
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....
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\11. Reboot your system.
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....
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reboot
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....
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\12. Check Java JDK version by java -version command . If installation
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is succesful, it will display like the following:
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....
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java version "1.8.0_45"
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Java(TM) SE Runtime Environment (build 1.8.0_45-xxx)
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Java HotSpot(TM) Server VM (build 25.45-xxx, mixed mode)
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....
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That's it! Note: We Assumed that the downloaded file is named
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jdk-8u45-linux-x64.tar.gz and used this name in all the commands used in
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steps 2, 4 and 5. It may depends on the type of O.S, processor type
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(i.e., 32bit or 64bit)
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'''
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See a typo, something missing or out of date, or anything else which can be
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improved? Edit this document at https://pagure.io/fedora-docs/fedora-howto.
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