This question already has answers here:
How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version
(51 answers)
Closed 6 years ago.
When I ran a java program I received this error.. Could you please suggest why do we get this error:
Exception in thread "main" java.lang.UnsupportedClassVersionError:
GenerateInvoice (Unsupported major.minor version 49.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
This class was compiled with a JDK more recent than the one used for execution.
The easiest is to install a more recent JRE on the computer where you execute the program. If you think you installed a recent one, check the JAVA_HOME and PATH environment variables.
Version 49 is java 1.5. That means the class was compiled with (or for) a JDK which is yet old. You probably tried to execute the class with JDK 1.4. You really should use one more recent (1.6 or 1.7, see java version history).
Another option is to delete all the classes and rebuild. Having build file is an ideal solution to control whole process like compilation, packaging and deployment. You can also specify source/target versions
The code was most likely compiled with a later JDK (without using cross-compilation options) and is being run on an earlier JRE. While upgrading the JRE is one solution, it would be better to use the cross-compilation options to ensure the code will run on whatever JRE is intended as the minimum version for the app.
This was a fresh linux Mint xfce machine
I have been battling this for a about a week. I'm trying to learn Java on Netbeans IDE and so naturally I get the combo file straight from Oracle. Which is a package of the JDK and the Netbeans IDE together in a tar file located here.
located
http://www.oracle.com/technetwork/java/javase/downloads/index.html
file name
JDK 8u25 with NetBeans 8.0.1
after installing them (or so I thought) I would make/compile a simple program like "hello world" and that would spit out a jar file that you would be able to run in a terminal. Keep in mind that the program ran in the Netbeans IDE.
I would end up with this error: java.lang.UnsupportedClassVersionError:
Even though I ran the file from oracle website I still had the old version of the Java runtime which was not compatible to run my jar file which was compiled with the new java runtime.
After messing with stuff that was mostly over my head from setting Paths to editing .bashrc with no remedy.
I came across a solution that was easy enough for even me. I have come across something that auto installs java and configures it on your system and it works with the latest 1.8.*
One of the steps is adding a PPA wasn't sure about this at first but seems ok as it has worked for me
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer
domenic#domenic-AO532h ~ $ java -version
java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) Server VM (build 25.25-b02, mixed mode)
I think it also configures the browser java as well.
I hope this helps others.
Related
I have downloaded Java code from GitHub and am trying to configure or build my changes into a Java package. But I'm getting the below error. I'm not sure what version of Java I need to use to build this project. Any pointers or suggestions would be really helpful.
error: cannot access Copier
import com.example.records.core.Copier;
^
bad class file: /home/user957/.gradle/caches/modules-2/files-2.1/com.example.streaming/streaming-core/v1.36.1/758f1477d776e3273c5397d2d5d7e19b5fa46326/streaming-core-v1.36.1-sdk.jar(/com/example/records/core/Copier.class)
class file has wrong version 62.0, should be 57.0
Please remove or make sure it appears in the correct subdirectory of the classpath.
mySystem JDK version
java -version
openjdk version "18.0.2.1" 2022-08-18
OpenJDK Runtime Environment Temurin-18.0.2.1+1 (build 18.0.2.1+1)
OpenJDK 64-Bit Server VM Temurin-18.0.2.1+1 (build 18.0.2.1+1, mixed mode, sharing)
Try JDK version 1.9 or higher.
If class files has version 62.0,then least JDK 9 installed on system to be able to compile them
I solved this problem, by just reinstalling my JDK. If you're using IntelliJ, just head to the project settings and click download in the JDK dropdown menu.
I also solved this problem on my Ubuntu 20.04 machine by running sudo apt install openjdk-13-jdk, which installs the jdk and
sudo update-alternatives --config java, which updates the index of the newest jdk (i think).
If I understood you wrongly with the version needed, just adjust the number behind openjdk- to whatever version you need.
All versions to their corresponding class file versions
This question already has answers here:
How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version
(51 answers)
Closed 1 year ago.
I've run into this error a few times trying to brush up on my Java. Looked up solutions on the internet and most suggestions were to compile or run the file with a flag/option argument to specify the correct interpreter version. My question is, is there a more permanent solution to this? (im using vscode. Guessing there is something i can add to my settings.json file in the workspace- but what?)
Error: LinkageError occurred while loading main class com.example.demo.DemoApplication
java.lang.UnsupportedClassVersionError: com/example/demo/DemoApplication has been compiled by a more recent version of the Java Runtime (class file version 59.65535), this version of the Java Runtime only recognizes class file versions up to 58.0
here is my version details
$ java --version
java 14.0.2 2020-07-14
Java(TM) SE Runtime Environment (build 14.0.2+12-46)
Java HotSpot(TM) 64-Bit Server VM (build 14.0.2+12-46, mixed mode, sharing)
Id like to not have to use flags whenever I compile and run a java file from the command line. Bonus points to you if you can explain why this problem happens in the first place? back when i learned java, you used to have to download and install the JRE and JDK separately. I can understand mistakenly downloading incompatible versions, but now it seems the JRE comes prepackaged with the JDK. How is it possible to have incompatible versions of the compiler and interpreter if this is the case?
This error is telling you that your class was compiled at a higher version of Java than the version you are trying to run with. More specifically, in this case, you compiled your class with Java 15 and try to run it with Java 14.
Depending on your situation, you have two ways to resolve the error: compile your code with an earlier version of Java, or run your code on a newer Java version.
Fix via the Command Line. If you're ready to move entirely to a newer JDK, you should download the newer version and make sure your PATH and JAVA_HOME environment variables are set appropriately. Assuming you have Java 15 JRE, you can run your code with the java command packaged with it.
IntelliJ IDEA. You can also control the version of Java you're using for compiling and running in IntelliJ IDEA. Go to File -> Project Structure… -> Project Settings -> Project and change your Project SDK and Project language level. Next run your project on the newer JRE: go to Run -> Edit Configurations… and change your JRE to 15. Now, when you run your project, it will run with the Java 15 JRE.
java.lang.UnsupportedClassVersionError: com/example/demo/DemoApplication has been compiled by a more recent version of the Java Runtime (class file version 59.65535), this version of the Java Runtime only recognizes class file versions up to 58.0
Set the JDK the same one when you compile and run the project:
That's to say, your file was compiled by JDK15, but the current runtime, which is also installed on your machine is JDK14. The dismatch of build and compile jdk version caused this error.
There're two important configurations to correctly configure your environment and project: java.configuration.runtimes and java.home. The former specifies options for your project's execution environment; the latter specifies your language server's execution environment.
You've installed JDK14, set the above two settings to use it can solve this error.
"java.home": "\PATH TO JDK14\",
"java.configuration.runtimes": [
{
"name": "JavaSE-14",
"path": "\PATH TO JDK14\",
"sources": "\PATH TO JDK14\lib\src.zip",
"javadoc": "https://docs.oracle.com/en/java/javase/14/docs/api",
"default": true
},
],
Cleaning the Java Language Server Worspace and reload the window in VS Code, then run again.
More information about java.configuration.runtimes and java.home, please refer to Configure JDK.
I have installed Cytoscape 3.8.0, but it doesn't run. However, I navigated to cytoscape.bat to check the issue which gave following error:
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/cytoscape/launcher/internal/Launcher has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
Also, after checking java version, I got following details:
java 11.0.8 2020-07-14 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.8+10-LTS)
I have also set all the required environment variables for java.
What can I do to resolve this issue?
As stated, you need to install Java 11. Because of the license issues with Oracle JDK, we now test exclusively against OpenJDK. You can get a version of OpenJDK 11 from AdoptJDK
In addition to Java problems, a recent update on Mac has caused OpenCL based Cytoscape Apps to fail and prevents Cytoscape from launching.
This will be fixed in future updates, but you can fix your Mac installation immediately by disabling OpenCL by either of the two following methods:
Download the disable-opencl.dummy file to your CytoscapeConfiguration
directory (in your user home directory).
Or, you can create an empty dummy file by running this command in Terminal:
touch ~/CytoscapeConfiguration/disable-opencl.dummy
These fixes are described at Cytoscape.org.
i have developed a small server, which works perfecctly in windows. i compiled this to a .jar file and pushed it to my linux server. I am unable to run the programm because of a version error. i found many informations on the internet but nothing solved my problem.
i developed it in windows with intellij using oracle jdk 12 and compiled it allready.
i have installed the default jdk (IcedTea 2.6.19) in my debian linux. i have also unzipped an openjdk 13 tar file but i dont know how and even if it is possible to execute this.
Exception in thread "main" java.lang.UnsupportedClassVersionError:
MultiThreadServer : Unsupported major.minor version 56.0
i would appriciate a solution. If i have to install an oracle jdk on my linux i would like to know how. i am new in windows and dont know how
You are probably trying to run your program against an inferior version of java. You can check it by typing java -version
In order to make sure you are running the right java version for your program you may try:
Use the full path of your JRE when launching the app. Let's say (I am only guessing where you could have unzipped your OpenJDK 13):
export JAVA_HOME=/opt/java/openjdk/13
$JAVA_HOME/bin/java -jar whatever_my_app.jar
Im getting this on one of my macs when I try to compile even "hello world"
Error:Execution failed for task ':app:compileDebugJava'.
Cannot find System Java Compiler. Ensure that you have installed a JDK (not just a JRE) and configured your JAVA_HOME system variable to point to the according directory.
On my other mac, I dont have any problems. The setup is the same as far as I can tell. It's just that for some reason, on one machine, Android Studio / Gradle pops this error message.
I have set
JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_60.jdk/Contents/Home
running /usr/libexec/java_home gives:
/Library/Java/JavaVirtualMachines/jdk1.7.0_60.jdk/Contents/Home
running javac -version gives :
javac 1.7.0_60-ea
running java -version gives:
java version "1.7.0_60-ea"
Java(TM) SE Runtime Environment (build 1.7.0_60-ea-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.60-b09, mixed mode)
In Android Studio I have set file->other settings->default project settings-> JDK location to the JDK location listed above.
I've run out of options, why am I still getting this message?
thanks for any help, Ive wasted hours on this already.
My findings from an identical error proved to be due to a clash of Java Jar files that were not related with the Android studio install.
Specifically the tools.jar and auskey.jar under /Library/Java/Extensions
More info here
Rich_LogicBox solution also worked for me.
I've struggled for weeks with different java versions making no difference.
When I removed the jar files placed in /Library/Java/Extensions by auskey, the Android Studio error disappeared.
One possible solution is :
The android studio needs the jdk 1.6+ by default, but your JDK is 1.7.
You can show the package content of the Android Studioin Applications folder, and the open the info.plist, change the JVM version to your JDK's version, which is 1.7* here.
(you see, my JDK version is 1.8 in my computer)