I am working on two projects one uses JDK 8 and other uses JDK 6.
I installed both the jdks in my machine where JDK8 is set as my default JVM. so I am good with one project settings.
When I am working on second project, I tried to change JAVA_HOME to C:\Program Files\Java\jdk1.6.0_45 and PATH added with C:\Program Files\Java\jdk1.6.0_45\bin and surprisingly I am seeing JDK8 as my default JVM. I checked with java -version or java -fullversion.
Questions.
Where should I stop the Java process that is initiated with JDK8 ?
Where should I start the Java process for JDK6 ?
How should I easily switch JVMs when I switch back and forth working on two projects ?
I dont like the idea of uninstalling one jvm when I have to work with another jvm.
Please suggest me. Thanks for your time.
Narayana.V
When you run a program in your shell, it is the PATH environment variable which determines which program is run. This is a feature of DOS prompt and unix shells and not specific to Java. If you want to change the program which is run by default, you need to change the PATH.
Related
In Netbeans 12.2 on Ubuntu 18.04 (using that snap install), for my C++ plugin I have that first image. When I try to create a new project I get that second image. That is some kind of a lightweight version that does not do your makefiles for you. If I try to open an existing C++ project it just never IDs any project file or folder as the right one. And notice that this version does not include a "Create from source code".
Does anyone know how I can install the "real" c++ plugin? I've looked in a lot of tutorials but they all say it should be there under Available Plugins, but it is not there.
This comes very late but it seems that Netbeans 12 lacks some components for this.
Therefore you must enable Netbeans 8.2 Plugin Portal from Plugins Settings.
Then deactivate the C/C++ and then force updates from Updates -> Check for Updates. Restart IDE and install 8.2 C/C++ plugin.
Note: I have lead into this problem now because unpack2000 is no more present.
The validation of downloaded plugins cannot be completed, cause: NBM ../.netbeans/12.4/update/download/org-netbeans-modules-cnd-kit.nbm needs unpack200 to process following entries:
netbeans/modules/locale/org-netbeans-modules-cnd-kit_ja.jar.pack.gz
netbeans/modules/locale/org-netbeans-modules-cnd-kit_pt_BR.jar.pack.gz
netbeans/modules/locale/org-netbeans-modules-cnd-kit_ru.jar.pack.gz
netbeans/modules/locale/org-netbeans-modules-cnd-kit_zh_CN.jar.pack.gz
netbeans/modules/org-netbeans-modules-cnd-kit.jar.pack.gz
This can be resolved by installing jre-11 (if it is not present already. I have it on Opensuse Thubleweed amogst with jre-16).
So then you just start netbeans from terminal with:
$ netbeans --jdkhome "/usr/lib64/jvm/jre-11"
...and then install blugin, and when it is ready close netbeans and start it normally again.
Just wanted to report that the answer from Devspain also works with Netbeans 14, in Ubuntu 22.04.
Problem
I want to both use stable versions of KRE and the bleeding edge nightly built KRE. One ASP.NET5 application may be beta2, but another I may want to be beta4. So what I did was install both in powershell as found here.
What happened is that the stable KVM installed in C:/Users/derp/.kre and the nightly build KVM installed in C:/Users/derp/.k
Worse yet, I can only see this now
Attempts
I tried kvm install KRE-CLR-x86.1.0.0-beta2 and it failed
Shall I try moving the packages from /kre file to the /.k file? This seems hacky and like a really bad idea
RTFM - Tried to use the install feature and including the -a, but failed.
I'm doing something the hard way and can't see the obvious.
I search on here
I feel if there is an answer to what I am trying to do above, it is worth being on here for others to find as well. Thank you all for your patience.
ASP.NET 5 is under development and there is no guarantee that changes between different pre-release version are backward compatible (sorry!).
The /.kre -> ./k rename is not backward compatible and you cannot have both the old and the new kvm simultaneously on the PATH. However, you can get can have two versions of kvm on your machine but you will have to use the full path for at least one of them.
I think the key is the path environment variable of your system. You have to use two set of "kvm", one for night builds, one for public beta, to download and set correct path environment variable.
For instance, I get one kvm from Entity Framework 7 repository, which can download and use beta 4 builds. I also have another kvm from Home repository which can download and use public beta builds.
You can use either kvm with "upgrade" or "use" command to set correct path environment variable, then run your application on the runtime you need. I think even Visual Studio 2015 CTP runs your projects based on the Runtime specified in your path environment variable. For the time being, only beta 3 run times can display in the project property dialog of VS 2015 CTP, but when hitting ctrl + F5, my website starts to load beta 4 runtime and assemblies, I can see the loading in output window, I think this is because I have .k folder prior to the .kre folder in the path environment variable.
Can you try the following?
$cmd-prompt>kpm Install KRE-CLR-x86
It worked for me.
Im having a very annoying issue with qtcreator and cmake projects: qtcreator fails to find the executable. It just prints "No executable specified" when trying to launch any executable from the IDE. Everything works fine after configuring the project (first time only). The issue manifests when loading the project afterwards. Only workaround is deleting the "CMakeLists.txt.user" before every use. This is tedious and unnecessary.
This is happening to projects that were running just fine for years, both my own and my colleagues, on multiple machines running ubuntu 14.04 & 14.10. Problems started with qtcreator version 3 and higher from ubuntu 14.04 upwards.
Assuming that the issue is triggered by some changes in the "CMakeLists.txt.user", after the project is closed the first time, I replaced the file with a copy of it right after it was created the first time. This worked, thus confirming that there is either something wrong with the file itself, or changes to it trigger an existing bug in qt-creator. Unfortunately it is just as tedious as deleting the file in the first place.
My Challenge:
Unfortunately I am not familiar with the inner workings of qtcreaor, however I managed to identify the specific config lines that are responsible. What does qtcreator actually change here?
Please note that "racoon" is the project name and the above diff screenshot is much larger than formatted by stackoverflow (right-click to view full resolution).
Thank you.
i had exactly the same problem using Ubuntu 14.10 and resolved it by doing the following:
Get ftp://ftp.pbone.net/mirror/ftp.sourceforge.net/pub/sourceforge/a/an/anthonos/mirror/os3-next/os3-rpm/q/qtcreator-3.1.2-0.x86_64.rpm
Extract the file /usr/lib/qtcreator/plugins/QtProject/libCMakeProjectManager.so
Overwrite this file at
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/ ( at least on x64)
in your system
This will replace the cmake plugin which is currently version 3.1.1 with 3.1.2 which will make the problem disappear !
I installed qtcreator using Qt's own installer instead of the one provided by Ubuntu. It installs version 5.3.1 and fixes the problem.
I am trying to install some commercial software that was written in Java for a Windows computer operating system. I have downloaded Java from their site and I have also downloaded the JDK package for a 64bit windows system so to my knowledge I should have everything I need to have java work. I then create a shortcut of the java exectuable javaw.exe and edit the target path and the start in path to my specifications but when I go to execute it, it tells me that it "Could not create Java virtual machine".
Does anyone know how to fix this error?
Luke H
How are you creating the shortcut? In windows, this might not be the correct approach.
Does the installer use an embedded version of java? It is possible that the software uses some native libraries that aren't compatible with 64 bit java.
Depending on the setup script, it may be passing invalid command line arguments to the version of Java you installed.
Its a bit late, but this might help others later.
Here's what worked for me:
Target: "C:\Program Files\Java\jre1.7.0\bin\javaw.exe" -classpath C:\OLINDA olinda
Start in: C:\OLINDA
It seems that you don't know how properly start the Java Virtual Machine, in Windows, the JVM can be started with two executables one is java.exe and the other one is javaw.exe, both do the same, the only difference is that java.exe is a command line tool (so you'll see a command line when you start your application) and javaw.exe simply omits the command line. Both use the same paramaters that can be found here: http://docs.oracle.com/javase/1.5.0/docs/tooldocs/windows/java.html, from this the shorter way to open a Java program will be:
java MainJavaClass.class
or
java -jar JavaProgram.jar
Most commercial programs are packed in jar files so probably you will use the second approach, but also be warned that usually commercial Java programs use a native wrapper so you can simply launch a native application (in Windows .exe), without the need to set anything, so you may need to create a shortcut for it instead of the java.exe program, in the case you really need to call the Java program through the JVM, then what you need to change is the Target field so you include the parameters you need to pass to it like this:
"C:\Program Files\Java\jre7\bin\java.exe -jar JavaProgram.jar"
Another way could be use a batch file to start the program and create a link to it instead.
Okay, so here is the deal:
I was trying to install the java jdk so i can work on an android project in eclipse on this computer, but there are just so many different installations of java its impossible, for me atleast, to figure out exactly which one i needed. so i went with "JDK 7u3 with Java EE". But this also installed this GlassFish stuff, which i have no idea what is or what it does, and when i was going through all the eclipse stuff i decided to just keep my other computer for work. so i removed eclipsed and the stuff needed for that, and i removed the java stuff, but then when i try to uninstall the GlassFish, it can't, and gives me the error:
"Could not find the required version of the Java(TM) 2 Runtime Environment in '(null)'."
I have now been trying for several hours, scouring the web to figure out some way of removing this, install all kinds of java stuff, removing it again, reinstalling, but nothing works. I don't really care what GlassFish is or what it does, i just want it, and all the java stuff gone for good.
How can i accomplish this?
under Microsoft Windows 7 (or others), use that command line :
uninstall.exe -j "%JAVA_HOME%"
You installed first jdk1.6 then uninstalled it. In this time, you install glassfish3 and glassfish wrote set AS_JAVA=C:\Program Files (x86)\Java\jdk1.6.0_x in its config file but you use now jdk1.7
Open C:\glassfishv3\glassfish\config\asenv.bat
Search 'set AS_JAVA'
Change its value to your current jdk path ( eg. C:\Progra¨1\Java\jdk1.7.xx )
Try to uninstall again.
You can run the uninstall specifying the jvm to use:
try this following command to uninstall
C:\glassfish3\uninstall.exe -j <java home dir>
as stated in the error message. it worked for me.
GlassFish is a Java EE application server developed in open source, so you can create server-side services that your android apps can consume. Of course, is sounds like you are not really interested in this :-)
The Java EE SDK install/uninstall instructions are here: http://java.sun.com/javaee/sdk/javaee6sdk_install.jsp
What you probably want to download, the Java 7 SDK (JDK 7) is here: http://www.oracle.com/technetwork/java/javase/downloads/index.html
Make sure you download the JDK (Java Developer Kit) and not the JRE (Java Runtime Environment).
Hope this helps.
These didn't work for me running java 1.6.0_24 in Windows 7:
I tried modifying the asenv.bat file that glassfish uses to find the jre to point to my jre.
I tried manually putting it in as in C:\glassfish3\uninstall.exe -j . This was per the official Oracle documentation.
The only thing that worked was to use the original path and move the bin and lib folders from my java installation to the directory that the error dialog
specified. Then the Glassfish uninstall started up and completed with no problems.
I was able to uninstall the glasshfish server by using the below command
uninstall.exe -javahome "%JAVA_HOME%"
Note: We need to set the JAVA_HOME in the environment variable and classpath variable