I need to run the Oracle JVM in the "client mode". Is there any option to do this on an x64 operating system?
I installed Oracle 7 JDK per apt-get. It installed the Oracle JDK and JRE x64 edition. So i have only /usr/lib/jvm/java-7-oracle/jre/lib/amd64/server directory and no amd64/client directory.
On the Oracle website, you can download the JRE Linux x64 and x86 packages, precompiled. I download them both and looked into the folders.
x64 package contains only amd64/server directory.
x86 package contains i386/server AND i386/client directories.
So, what can I do to use the client mode? Have I install the x86 edition of java? I think I can do this only manually and not with apt-get because it recognize that I have a x64 operating system.
Thanks!
AFAIK the 64bit version of the Oracle JVM only supports the server mode at the moment (my guess is we'll never see a client version). This FAQ would see to support that. I don't think the Open JDK project has a 64bit client version either but it's been a while since I checked: this post confirms my suspicion. It seems the server VM is as good as or better than any dedicated client VM would be.
Related
I am looking to Download IBM Java JDK 8 for windows 10 OS or Windows Server 2012 R2 OS.
Does IBM provide JAVA JDK 8 software so that we can install and test it?
Or
Does IBM provide only AIX and Linux supported IBM Java 8 installation software?
I referred the IBM page, it contains only AIX, Linux version of Java installation software.
https://developer.ibm.com/javasdk/downloads/sdk8/
IBM says
The SDK is available only as part of an IBM product.
Which means follow the links at the end of the page you linked from your question, download Eclipse, use the JDK that will be installed with Eclispe. Then, if you don't want Eclipse, delete it and keep the SDK.
OR
You can use OpenJ9, which is the JDK used by the IBM SDK.
As an aside I have to wonder why you need the IBM JDK in particular.
I need to install open JDK in my Windows 64-bit os. I have used ORACLE open JDK and downloaded from the below link: https://jdk.java.net/8/
While downloading I have selected Accept License Agreement and installed.
But, after the installation when I tried checking the version using command java -version it's showing like regular JDK.
Can anyone help me to get where I went wrong? Or is there any better vendor to install open JDK in windows. Thanks.
Amazon offers an open jdk for Windows (and other OS), but just for Java 8, 11 and 16.
You can download it from here: https://aws.amazon.com/es/corretto/
After installing it and running the java -version command, you will see something like this:
>java -version
openjdk version "1.8.0_242"
OpenJDK Runtime Environment Corretto-8.242.08.1 (build 1.8.0_242-b08)
OpenJDK 64-Bit Server VM Corretto-8.242.08.1 (build 25.242-b08, mixed mode)
You need to set your java version in environment of you machine and target your JDK8 bin folder, or any JDK that you want to have at your disposal when you run java -version.
The best way to do this is to use the builds from adoptopenjdk. They're very high quality and come in multiple variants for Windows ranging from zip files to MSI installers. Dead simple to install JDK 8, 11 or 15.
But, after the installation when I tried checking the version using command java -version it's showing like regular JDK.
This is because JAVA_HOME is pointing to your old JDK. You need to go to Control Panel and change the Environment Variables. Just do a search on Windows 10 for "Environment Variables" to easily find that configuration panel.
Azul Systems provides builds of OpenJDK and relative installers, for all OSes and JDK versions.
It also provides builds of the JDK with OpenJFX included.
The installers bind JAR files to be executed by Java on Windows.
Download from azul.com website
I know this is old but should anyone run across this in search of OpenJDK 8 go here
https://developers.redhat.com/products/openjdk/download
When the JDK already includes JRE for the execution of code, why do I have to download JRE separately to execute my java code is the doubt that's bothering me
As far as I remember this depends on your OS, browser and JDK version.
Eg. if you're using a 64-bit OS and installed a 64-bit JDK, but are using a 32-bit browser, then you might have to install a 32-bit JRE if you need Java support in the browser.
Otherwise a separate JRE installation should not be required, since the JDK installation also installs the JRE.
JRE: Java Runtime Environment. It is basically the Java Virtual Machine where your Java programs run on.
JDK: It is a group of utilities one needs to develop programs in Java including JRE, and the compilers and tools (like JavaDoc, and Java Debugger) to convert the source code into bytecode.
Refer: http://javarevisited.blogspot.de/2011/12/jre-jvm-jdk-jit-in-java-programming.html
Similar, post is there on below link as well.
What is the difference between JDK and JRE?
as the headline mentioned: is it possible to connect VisualVM to an remote application running on JRE instead of JDK ?
And yes, the VisualVM itself runs on JDK !
Kind regards
Dominik
VisualVM connects to a running Java Virtual Machine (JVM).
And this JVM is contained both in the JDK and the JRE.
In fact, the JDK is a JRE with additional tools and items to allow creating Java programs. If you only want to run them, you only need a JDK.
So yes, you can connect to a JRE-only install.
Sun's website is confusing.
I am looking for Java 1.6 Enterprise Edition SDK for WINDOWS 7 64-bit.
I found the 64-bit Standard Edition, and the 32-bit Enterprise edition.
Can anyone help?
Thanks
The 32bit vs 64bit refers to the JVM itself, as well as some core libraries. So the 64bit JavaSE download is the JavaSE runtime on top of a 64 bit JVM.
On top of that, the majority of the JavaSE APIs and libraries are not specific to 32bit or 64bit. JavaEE runs on top of JavaSE, and so it's not 32bit-64bit specific.
So, pick the JavaSE appropriate to your environment, and don't worry about it for JavaEE.
I'm going to answer my own question, how about that:
https://cds.sun.com/is-bin/INTERSHOP.enfinity/WFS/CDS-CDS_SMI-Site/en_US/-/USD/ViewProductDetail-Start?ProductRef=java_ee_sdk-6u1-wjdk-oth-JPR#CDS-CDS_SMI
I had Java SE 64-bit installed and I tried to install Java EE. I had the following error (well something like that):
Missing Java installation...
If Java is installed on your computer you can try : Java_EE.exe -j (Java(TM) Directory Installation)
I tried the -j command with JDK, JDK\bin, JRE, JRE\bin
I tried to reinstall java 64-bit
I tried re-setting JAVA_HOME, PATH and CLASSPATH variable just for
the sake of it...
Nothing worked
I installed Java SE 32-bit, double click Java_EE.exe and everything work...
EDIT : And now to complement the strangeness when I go through the Java_EE.exe installer, the installer spot my Java SE 64-bit edition (maybe because I set the environments variables)