I had setup 64-bit eclipse with 64-bit JRE. I wanted to try QuickTime for Java but I realized that it is not compatible with 64-bit JRE. One option I have is to change over to 32-bit eclipse as well as 32-bit JRE. But I was wondering if same 64-bit Eclipse can be used along with 32-bit JRE also.
Please suggest!
EDIT: I guess I was not clear enough in my question. I do understand that I will need to use a 64-bit JRE to run 64-bit Eclipse. I only wanted to make sure that I can have a project in 64-bit Eclipse which uses a 32-bit JRE for execution.
Just include the 32bit JRE as an additional Java runtime in the configuration and use it for your project.
You cannot use 64-bit Eclipse with 32-bit JRE, but you can have both 32-bit and 64-bit JREs installed on your system. If you find that one or the other Eclipse fails to start in this situation, it is likely finding the wrong JRE. To remedy the situation, add the following lines to the start of your eclipse.ini file:
-vm
[fullpath]\javaw.exe
First, you need create a 32bit jre environment in menu windows/preferences/java/installed jres. Then, you can create a java project and select 32bit jre environment for 32bit java program.
Related
I have a 64bit operating system with phpStorm 9.0.2 installed.
I get out of memory errors and it seems like JVM32bit might not help the cause.
How can I upgrade my JVM32bit version to JVM64bit?
Is it just as simple as downloading a 64bit version and installing it or are there any other extra steps to take to do this correctly?
OS Win 7 64bit
You can run PhpStorm even if you have no Java installed on your computer as on Windows it comes bundled with own 32-bit JRE which will be used by default ignoring your system-wide Java (if you have one).
That's why "uninstall 32-bit Java and just install 64-bit one instead" is not enough (as in some cases you simply have no system-wide Java installed on your computer).
Download and install 64-bit JDK (yes, it has to be JDK and not just JRE)
Create IDEA_JDK_64 environment variable and point it to JDK root folder. For example:
Use 64-bit PhpStorm's executable (PhpStorm64.exe) instead of 32-bit (PhpStorm.exe).
The above works just fine for me.
If anything -- please refer to official support article.
I need to run java in 32 bit mode under windows 8.1 64 bit.
I have installed java 7 jre under c:\Program Files\Java\jre7 (64bit JVM) and under c:\Program Files (x86)\Java\jre7 (32bit JVM).
However, if from cmd I issue java -d32 -version, I get this error:
Error: This Java instance does not support a 32-bit JVM.
Please install the desired version.
Without the -d32 switch it confirms its running the 64 bit JVM:
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)
So I opened the java control panel and added the 32bit JVM to the user installed JRE (system tab does not allow me to change anything even if running as administrator), but nothing changes.
I've read some posts of users saying that with java 7+ the -d32 mode should be supported but I can't get it.
Note: Please note that I cannot remove the 64bit JVM because I need it for other applications
According to this FAQ :
How do I select between 32 and 64-bit operation? What's the default?
The options -d32 and -d64 have been added to the Java launcher to
specify whether the program is to be run in a 32 or 64-bit
environment. On Solaris these correspond to the ILP32 and LP64 data
models, respectively. Since Solaris has both a 32 and 64-bit J2SE
implementation contained within the same installation of Java, you can
specify either version. If neither -d32 nor -d64 is specified, the
default is to run in a 32-bit environment. Other Java commands
(javac, javadoc, etc.) will rarely need to be executed in a 64-bit
environment. However, the -d32/-d64 options may be passed to these
commands and then on to the Java launcher using the established -J
prefix option (eg: -J-d64).
All other platforms (Windows and Linux) contain separate 32 and 64-bit installation packages. If both packages are installed on a
system, you select one or the other by adding the appropriate "bin"
directory to your path. For consistency, the Java implementations on
Linux accept the -d64 option.
I've found another solution to that.
By using launchj4 I can wrap my jar into an exe and I can specify the JRE I want to use and force it to search for a 32bit JVM, set min and max version etc (see the JRE).
The wrapper will automatically search installed JRE's and chose the one that meets the requirements.
Also wrapping my jar into an exe is more convenient for deploying my application.
You can have both 32bit and 64 bit installed on the same machine. Infact you can have multiple version of each of 32bit and 64bit installed (eg - java6 and java7). Because each JRE will be installed in different folders, it usually does not matter.
When running different versions of jre, your application will search for the Java executable using the PATH variable. So if Java 32bit is first on the PATH, you will have problems running a Java 64bit application. You can modify the path to use a certain Java version e.g. by defining a environment variable JAVA32HOME with the value C:\java\java6 (32bit) and change the command to
%JAVA32HOME%\bin\java ...
Or you can manually add the version you want to use, first in the PATH variable. Remember the first instance of java.exe found while searching your PATH will be the one that is executed.
Why don't you just install the 32-bit version of Java as well from the link below:
Java Downloads for All Operating Systems
Consider going to your settings , choosing your active profile then click on advanced settings , now on the menu that pops up and choose the version you would like to work with . Once everything is configured use the terminal to verify the usage of the right version. Now incaqse thus pdate-alternatives --config java. through the terminal and update any values by selecting the version you like and pressing down on the enter key on the output you get
Here is my problem:
I want to use j2pkcs11.dll in my java application. I downloaded dll from here and move it to system32 directory. When I run my code I have got :
java.lang.UnsatisfiedLinkError: C:\Windows\System32\j2pkcs11.dll: Can't load IA 32-bit .dll on a AMD 64-bit platform
My OS is windows 7 64-bit and my jre is 64-bit too. Obviously I need to get 64-bit version of j2pkcs11.dll but when I searched the web I could not find it anywhere. Any clue?
Ok, for those who may encounter this problem, it seems that there is no support for j2pkcs11 in jre-64bit. So I install 32-bit jre and select this jre as my runtime jre in Intellij.
I have downloaded and installed IDEA 13.1. However, even having a 64-bit system, Windows has automatically installed the program in the folder Program Files (x86), which is dedicated for 32-bit programs.
Is there another download for the 64-bit version or maybe a special setting to make it suitable for a 64-bit system?
In C:\Program Files (x86)\JetBrains\${Intellij Idea version}\bin, there is an executable called idea64.exe. This is for 64-bit systems. You can simply change your IntelliJ shortcut path to it.
You also need to add a new environment variable IDEA_JDK_64 pointing to your 64-bit JDK so IntelliJ can use a 64-bit JDK.
idea64.exe uses this JDK search sequence:
IDEA_JDK_64 environment variable
..\jre64 directory
system Registry
JDK_HOME environment variable
JAVA_HOME environment variable
More can be found in a related IntelliJ support article.
If installing latest version as of today 2016.3.2, while installing the installation wizard prompts to either choose 32-bit or 64-bit.
You need to install the Java SDK 64bit so it shows the options to install IntelliJ 64bit.
How do I tell if I am using 64-bit Eclipse and 64-bit JVM on my Linux machine?
To verify that you are using 64-bit JVM:
java -d64 -version
In a comment above you say that you're using a software package that requires "such constraints". I'm not exactly sure what you mean by that, but for Java programs, it doesn't matter if the underlying Java implementation is 32-bit or 64-bit (well, as long as it doesn't need a huge amount of memory, for example). A normal Java program should run the same, no matter if it runs on a 32-bit or 64-bit OS.
java -version should give you an indication if your Java runtime environment is 32-bit or 64-bit.
Eclipse contains some native binaries (for the SWT libraries). Depending on if your Java runtime environment is 32-bit or 64-bit, you need a version of Eclipse with the corresponding native binaries. The Eclipse download page contains links for 32-bit and 64-bit Linux versions of Eclipse.
Note: If your OS is 64-bit but your Java RE is 32-bit, you will still need the 32-bit Eclipse.
Usually you can tell from your eclipse.sh or your eclipse.ini if you are using 32bit or 64bit version, as the involved plugins are quite different.
As for the JVM, are you running Eclipse with something other than your default JVM? 'which java' usually tells you what you're using as your java executable.