I have two jre in my PC which is running windows 7. When I am running a eclipse project I dont know which version of jre it is calling, so I searched on net for the solution and tried this two things:
In cmd typed java --version and it showed me 1.6.
In control panel, I went it in java control panel and selected java and it showed me 1.7 enabled.
Now, I am confused and how can I change the jre of the system? I want my eclipse project which is running on tomcat to use a specific jre. But I dont know which jre my system is using.
Thanks in advance.
You may check Windows->Preferences->Java->installed to check default JRE that it runs things under.
You may also check property eclipse.vm under the Help->About Eclipse->Installation Details->Configuration.
choose window preferences in eclipse. Select installed jre and add a jre and select an jre you are going to use.
java -version is what a java app on the system will use by default. What IE uses is determined by the extension (Tools->Manage add-ons) you can see the java plugin there.
You can register any jre vesion you want in eclipse using the window->preferences-> installed JRE's
If you are using eclipse, you can set the Java version by going to project->properties->java build path->select the jre version and click on edit.
You can choose the version that you want. Whichever JRE library is displayed in the build path is the version that eclipse is using to compile your code.
Related
I am using Intellij to write code in Java, if I run my software inside Intellij my software works but, if I create a jar file and I try to start it from my terminal it says that the jre version is too old.
My question is, if the JDK includes also the jre and my software works in Intellij, why it doesn't from the Ubuntu's terminal?
Intelij is poiting to a different java version than the one configured in your terminal path.
If you want to keep booth version the same you can look in Intelij Settings to find out which version it is using, then replace the /usr/bin/java link in your terminal to point to the same java binary.
Or, simply folow these step to just update your teminal version: install-java-ubuntu
I dont know anything about IntelliJ but why not just update the system JRE so it is the same as or more recent than the version that IntelliJ uses?
I already have some version installed on the machine, 1.7 and 1.6.
Now I have the need to install version 1.5, but when I try to install an error occurs, speaking to uninstall the versions that I have the Java (JDK).
I have no chance because I have other applications using these versions, is there any possibility to do this without uninstalling these versions I already have ?
Thank in advance !
Bypassing the installer is bit of work, but doable. How to extract Java from the EXE installer is described in this answer: https://stackoverflow.com/a/6571736/73652
The JDK is a package of tools for developing Java-based software.
Check your system architecture in the control panel, i.e. 32 or 64-bit.
Click on C → program folder → java folder.
If there is no JDK folder present, then follow the below steps:
Search in Google JDK download.
Scroll to bottom, and check for the system architecture of your system.
Click the download link and wait till the download is finished.
In downloads click on show in folder.
Click on the JDK icon and click on next until the setup process is completed.
Please find this video along with steps for JDK Install.
I have both Net-beans and eclipse IDEs installed in my laptop, But there is a per-devolved system that want lower version of JDK. so I installed net-beans older version too. but then JDK does not support my eclipse version. can I use two JDK in once?? and what should I do for working in both IDE in different versions.
Eclipse / Net beans need JRE to run in first place. If the version of JRE you install is not supported by the version of Eclipse/Netbeans u have, then you have to get a compatible version of Eclipse/Netbeans that match your installed JRE. (Alternatively you can change the JRE version)
Now coming to JDK. You need JDK only to compile you code inside Eclipse/Netbeans. You can have any number of JDKs installed and you can configure 'per project'.
In Eclipse, this is how you configure the JDK for the project
Java Build Path -> Libraries -> Add Libraries -> JRE System Library
In the next screen you add the desired JDK from your system , by locating it in the file browser.
P.S : Havent used Netbeans, but sure it is supported
Alright so basically, I'm trying to run Eclipse with JavaFX, but then it gives me this error:
You are not running your eclipse instance with Java7 or Java8. The JavaFX tooling is disabled because of this.Make Java7/8 the default system java or adjust your eclipse.ini to pass -vm pointing to your Java7/8 install.
In case you want to turn off this check open your preferences and go to General > Startup and Shutdown and uncheck 'JavaFX Tooling Java Check'
Now I know it isn't pointing to the right SDK, but I have no idea how to change it, since I'm kind of new to this this stuff. I've already downloaded JDK 7.40 as well. I'm also using Ubuntu on a virtual machine, if that even matters anyway. Can anyone help me, I'd appreciate it.
Pre-requirements:
Install Java™ 8.
Install Kepler SR2 (4.3.2) .
The Kepler is still not supporting Java8. What to do?
Open Eclipse
Help > Install New Software…
Enter the following URL into the ‘Work with’ field:
http://download.eclipse.org/eclipse/updates/4.3-P-builds/
Press ‘Enter’
Select category ‘Eclipse Java 8 Support (for Kepler SR2)’
Click ‘Next’
Click ‘Next’
Accept Licence Agreement
Click ‘Finish’
Now jre8 is correctly located.
Now configure JavaFx
Open Eclipse
Help > Install New Software…
Enter the following URL into the ‘Work with’ field:
http://download.eclipse.org/efxclipse/updates-released/0.9.0/site
Press ‘Enter’
Select category ‘Eclipse Java 8 Support (for Kepler SR2)’
Click ‘Next’
Click ‘Next’
Accept Licence Agreement
Click ‘Finish’
It looks like the default java on your system is not java7. What do you get when opening a shell and execute java -version? Solution is to:
A) make java7 the default java
B) start eclipse with -vm
Apparently, you have installed 32bit Eclipse and 64bit JRE/JDK on a 64bit OS. Please use 64bit Eclipse and the problem will be solved. Please make sure JAVA_HOME And JRE_HOME is present in environment variables.
I had the same issue. I tried re-installing Eclipse, but it wouldn't work. I had to completely remove the project and delete all the project files. After that, I re-started eclipse and created the project again. However, this time I made sure the project path included the Java FX library as shown in the screen shot.
Java Build Path
I did this while I was creating the project and then I was able to create the project without any issues. Give this a try.
I'm extremely confused about how to set up Java on Eclipse. I don't get how classpath/system variables/etc all works. I set my Java compiler settings from 1.7 to 1.6 after I uninstalled 1.7 (I still have 1.6). But it's still not working. Any help?
Open Eclipse. Follow Project => Properties => Java Build Path.
Come onto Libraries tab and on the right hand side you will see some buttons, click Add Library.
Select JRE System Library and click "Next" button. By clicking on Installed JREs button you will see the JREs that your Eclipse recognizes. If the JRE version is not visible there, you can use "Add" button to add a new JRE, and make sure you set the path of new JRE correctly. Sample path on my machine: C:\Program Files (x86)\Java\jre6
Probably you have to set up classpath: http://javarevisited.blogspot.com/2011/01/how-classpath-work-in-java.html, or may be you have only JRE (not JDK)?