I had java version 8 previous and my eclipse worked just fine. But now I have java version 7 and I can't open eclipse on my computer. What should I do? please help.
I think there are two options:
Upgrade to Java version 8 (or newer).
If you can't do that, downgrade to a version of eclipse that supports Java 7. eclipse 4.5 (Mars) (or earlier as noted on the linked page), as of eclipse 4.6 (Neon) Java 8 is required.
I feel I should note that newer versions of Java (and eclipse) can still target Java 7 (and many earlier versions).
But now I have java version 7 and I can't open eclipse on my computer. What should I do?
Use versions that work together. When you for example look at your second screen shot, it says something like "requiredJavaVersion=1.8" or so.
In other words: you can't just come in and run eclipse with any version of java.
The other answer gives you the required details.
And a final note here: in case you tried to start eclipse with that older JVM in order to "allow" to ensure that eclipse won't allow "java 8" stuff in a project: that isn't the right way then. Instead: eclipse allows you to "define" JDKs to be used for your project. So you can easily tell eclipse: "I have a Java7 jdk sitting here, please use that for project X".
You do not need to run eclipse itself with a Java7 JVM in order to use a Java7 JDK for an eclipse project!
There will be a file under the Eclipse installation directory named as eclipse.ini.
It will launch the eclipse for that specific jdf and you can change the path to your jdk7.
Hope it helps.
It depends basically on which version of the eclipse you have.
If you have eclipse 4.6(Neon) or the latest version, then you must need a newer JDK version of Java (>=1.8 which you need to download). Or If you want to roll back to an older version of Eclipse then consider downloading eclipse 4.5(Mars).
Or If you have an eclipse version of 4.5(Mars) or older then see in eclipse.ini
-Dosgi.requiredJavaVersion = 1.8 and change it to -Dosgi.requiredJavaVersion = 1.7 which can be found in the folder containing eclipse.exe file.
Related
*Due to some project requirements I "have" to use eclipse 4.18 (2020-12) which uses Java 11 by default and is mandatory to start.
But my entire project is/was written in Java 1.7 earlier. Now , in my mac i have both java 1.8 and 11 installed also my eclipse settings are such shown below.
I have made sure removed all java 11 references in my eclipse and made the project and workspace configure to take the 1.8 jdk and run at 1.7 compiler level.*
but when i run ,project -->clean-->build, i run into the JaxB missing in java 11 ( in java 11 JAXB was removed and my project uses jaxB extensively) This is known.
So i am wondering what am i missing that my projects are still building my project with java 11 and not java 1.7 (using jdk 1.8 configured).
Please help.. stuck on this since some days.
machome
Eclipse Compiler setting-1
Eclipse Setting Execution Envs
Eclipse installed JRE's
Eclipse Project specific setting
Java 11 JaxB error
If Eclipse itself is being run with Java 11, and you have a plug-in installed that has not been properly update to work under Java 11, as it appears, you will need an updated version of that plug-in. Update to the latest "oracle design studio", and if you still see this problem, contact Oracle support.
The latest Eclipse may require Java 11 to run, but it's simple to set up Eclipse projects that use older Java versions. Don't mess with the Java version it uses to start up, as long as that is a proper Java 11 version.
As one commenter mentions, you'll have to have a particular Java distribution configured in "Installed JREs->Execution Environments", and then you'll have to have the project configured to use that Java version symbol, like "JavaSE-1.7".
I am a regular IntelliJ user, but most of my co-workers use Eclipse. A lot of them say the latest version of Eclipse "2020-09", which requires a JRE "higher than Java 8" in order to run, cannot be used to develop projects requiring JRE8.
This is pretty surprising to me, since I know it is possible to install multiple JDKs and JREs on one machine, I've done it plenty of times.
What is the typical way a person would configure Eclipse 2020-09 (already installed) to work on a project that requires a Java 8 JRE?
JRE 8 apps in eclipse workspace is possible by having the jre 8 jdk. It is true that in order to use eclipse 2020-09 you need java 11+ jdk/jre, but making projects that support jre 8 is still possible.Even I still use 2020-06 and before. Here is a method you could use to get JRE 8 implemented back in your project. Although you can change the defaults, this one will help you change the environment back to java 8 for 1 project.
Right click the library named somthing like "JRE system library[JavaSE-11]". Press properties. This is what you will see JRE System Library chooser image
Choose "Alternate JRE" then click "Installed JREs"Step Image
Press "Add" then you will see 3 options. Choose standard VM. Find your java 8 jdk directory. Usually it is something like C:\Program Files\Java\jdk1.8.0_251.
You can configure the default arguments for your jvm runtime. Then simply hit ok,select the jdk-8 library and close it. Then choose alternate jre again and in the drop-down choose jdk-1.8.0 or some name like that. This will only work if you also have java 8 installed alongside java 11 that is configured properly JDK
You can use Java 11 to start the Eclipse 2020-09 and configure a project to compile with Java 8. The problem is if you want a Eclipse plugin that uses CORBA for example. This module was removed from Java 11 earlier. In this case, I recommend to use Eclipse 2020-06.
Earlier versions of 2020-09 was working with Java 8. I had it, too. Then I updated and I got the same error message like you.
I propose to use an older one or to install JRE 11 and set the JAVA_HOME env variable to it.
The inside the IDE you can set java 8 like an JDK and develope your project with Java 8 while eclipse is running with 11.
After some experiences with Scratch, they told me the best option for beginners is Java, if I want to learn something usefulin future. I downloaded Java SE (JDK 10) and Netbeans and installed both. Netbeans ask for a folder that is Java, which I just installed. But it doesn't recognize the folder and says firstly no compatible version found and later the specified JDK folder does not contain JDK. What is wrong?
You have installed JDK 10 I guess. There was a contradiction in your question since you have downloaded JDK10 and installed JDK8. First of all, I would like to mention that the latest version of of Netbeans supports only JDK8.
Try installing JDK 8 and reconfigure Netbeans accordingly.
NetBeans only supports JDK 8. Install that and point to the folder for JDK 8 when NetBeans asks. If it doesn't ask again you can do it manually, shown here Changing java platform on which netbeans runs
The type java.util.Comparator cannot be resolved. It is indirectly referenced from required .class files
I recently installed Java 8. While executing an application, I got above mentioned error can you please help me.
I am using:
Java - jdk1.8.0_51
Tomcat - apache-tomcat-5.5.26
Assuming you are using some IDE, like Eclipse. When you are using jdk 1.8 with IDE, you need to update your IDE to support version 1.8.
It does not matter you are using new jdk's feature or not, but compiler has to load new JRE files in order to compile your project.
If you are using IntelliJ, go to:
File/Settings/Build, Execution, Deployment/Compiler/Java Compiler
and make sure "Use compiler" and "Project bytecode version" have the right configuration.
I had this same error and tried many things to fix it, but finally worked was remarkably simple: It turns that I was simply using an older version of Eclipse that did not support a "Compliance Level" setting of Java that was as high as my JRE. I merely upgraded to a newer version and the problem went away.
From what I understand about "Compliance Level", it's the version of Java that your program is supposed to work on. That much I found out from reading stuff on the net. But what the other solutions did not mention is that your IDE has to be able to be set to a level as high as your JRE. In my case, I was using JRE 1.8, but the highest compliance level my older IDE supported was 1.6.
IMO, this situation should have been flagged as an error by Eclipse. But as it was, I wasted two nights trying to figure this out.
Your project build path could be referring to a jre instead of JDK.
Go to your build path. (In eclipse right click and choose build path).
Go to your libraries and replace the jre with the jdk.
pom.xml version is 1.6?
If this is the way,you would replace jdk1.8 with jdk1.6 ，and environment variable into jdk1.6。
Same strange problem occurred. It turned out that wrong jdk version was in JAVA_HOME
There you are I had the same issue but moment I saw your question i got it fixed. problem is you are not using old version since there is mismatch of referencing with new version. this error will come.
Work around:
1. Change your java version to old.(In my case I had to change to 7)
2. Update each libray and jar file compatible to java 8 that way it will refer java not class file
Here is the image of environment variable in my problem
check if build path is set to run with JDK. It is important point that JKD is software development kit while JRE is a runtime env. Advice who had this problem see the different between JDK, JRE and JVM. https://www.guru99.com/difference-between-jdk-jre-jvm.html
I am using Jenkings on Cloudbees and I would like to change the JDK version to 1.8.
I followed the tutorial at developer.cloudbees.com/bin/view/DEV/PreInsatlledJDKs. However, I fail at step 10 -> There is no such option to choose the JDK. Where can I change this?
UPDATE: I made some screenshots to better explain my problem.
This is the jenkins configuration for the JDK. As you can see, I only have one JDK selected and it's Java 8.
However, if I view my "System Information", everything looks like Java 7. It says that "java.home" still points to "/opt/java7/jre" and "java.runtime.version" points to "1.7.0_25-b15" for example.
Not surprisingly, the compilation process of my maven project fails, because for the maven compiler plugin I specified 1.8 as source and target java version.
If you have one single JDK, then you won't see that option, cause it will pick it up by default.
You will se the JDK option with the drop down menu if you have more than 1 JDK configured in your jenkinsURL/configure.