This question already has answers here:
How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version
(51 answers)
Closed 9 years ago.
I did a project using jdk 1.7. And then I changed it to the 1.6, I got the following error:
java.lang.UnsupportedClassVersionError: com/simulator/server/Start : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:303)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:316)
Could not find the main class: com.simulator.server.Start. Program will exit.
Exception in thread "main" Java Result: 1
I'm using NetBeans platform and that changes are did using the NetBeans.
Recompile your project on JDK 1.6.
Unsupported major.minor version error happens when your code is compiled on a different java version(jdk) and you are trying to run it a different java version(jre).
You should ether switch back to java 7, or recompile your code with language level 6 (assuming you aren't using any new Java 7 features).
yes you get this exception when you compile your code with a higher version and try to run it with a lower one.
Either recompile with java 6(and run with java 6 as you are) or run with java 7(as it is already compiled with java 7).
Related
This question already has answers here:
How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version
(51 answers)
Closed 7 days ago.
Uncaught exception in thread "main"
java.lang.RuntimeException: An exception occurred when launching the server!
at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:71)
Caused by: java.lang.RuntimeException: Error invoking MC server bundler: java.lang.UnsupportedClassVersionError: net/minecraft/bundler/Main has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at net.fabricmc.loader.impl.game.minecraft.BundlerProcessor.process(BundlerProcessor.java:102)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.locateGame(MinecraftGameProvider.java:190)
at net.fabricmc.loader.impl.launch.knot.Knot.createGameProvider(Knot.java:177)
at net.fabricmc.loader.impl.launch.knot.Knot.init(Knot.java:130)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:68)
at net.fabricmc.loader.impl.launch.knot.KnotServer.main(KnotServer.java:23)
at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:69)
Caused by: java.lang.UnsupportedClassVersionError: net/minecraft/bundler/Main has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at net.fabricmc.loader.impl.game.minecraft.BundlerProcessor$1.loadClass(BundlerProcessor.java:65)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at net.fabricmc.loader.impl.game.minecraft.BundlerProcessor.process(BundlerProcessor.java:85)
... 6 more
Is the error code I get. I am launching a Fabric server, but normal server jars only give me "A Java Exception has occurred".
I am using Windows 11, that is probably part of the issue, and there might not be a fix, but I have to ask in case there is one.
https://javaalmanac.io/bytecode/versions/
You're trying to run a java 17 program with java 8
Upgrade your java installation to run it properly
This question already has answers here:
How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version
(51 answers)
Closed 1 year ago.
I was able to dock my project in Spring Boot from the following docker file:
FROM openjdk:7-jdk-alpine
ARG JAR_FILE=target/edms-influx-device-fixer-1.2.1.jar
COPY ${JAR_FILE} edms-influx-device-fixer-1.2.1.jar
ENTRYPOINT ["java","-jar","edms-influx-device-fixer-1.2.1.jar"]
But when I try to run with the docker command:
docker run -p 8085: 8085 name project
Take this exception:
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/springframework/boot/loader/JarLauncher : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:808)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:443)
at java.net.URLClassLoader.access$100(URLClassLoader.java:65)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.net.URLClassLoader$1.run(URLClassLoader.java:349)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:348)
at java.lang.ClassLoader.loadClass(ClassLoader.java:430)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:323)
at java.lang.ClassLoader.loadClass(ClassLoader.java:363)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
I state that my JAVA_HOME environment variable points to jdk-14.0.2
If in my docker file I use: openjdk:8-jdk-alpine I get this exception:
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/xxxx/xxxx/xxxx/App 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
How Can I solve this exception?
Unsupported major.minor version 52.0 means your code/libaries you are using, was compiled with Java 8. and you are trying to run on Java 7 FROM openjdk:7-jdk-alpine so it will not work.
The solution is to switch to running on Java 8+ e.g. FROM openjdk:8-jdk-alpine. Or to change your code/dependencies to be Java 7 compatible.
i have installed jboss-eap-6.3 on UNIX server, when i run the add-user.sh script i am getting following error..
jboss-eap-6.3/bin $ ./add-user.sh
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/jboss/modules/Main (Unsupported major.minor version 50.0)
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)
The message about version 50.0 means that the class files were
compiled for JDK 1.6 (or greater, when others are released). The JVM
that's reading that file must not be 1.6.
Compile in JDK 1.6 and running on lower version than Java 6
Please refer here for similar kind of issue.
Can you check the version of Java you are using?
You have to know that JBoss EAP 6.x must be run on JDK 6 or JDK 7.
This question already has answers here:
How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version
(51 answers)
Closed 7 years ago.
Ok I am trying to make an SDK app and I am working with the newest Java version (I believe Java 8u60) and I have installed SAP BI 4.1 SP 6 on a VM. When I ran my program first from the BOE scheduling functionality, I got this error
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/ghc/bo/extract/ExecuteExtract : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:735)
at java.lang.ClassLoader.defineClass(ClassLoader.java:716)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:336)
at java.net.URLClassLoader.access$000(URLClassLoader.java:59)
at java.net.URLClassLoader$1.run(URLClassLoader.java:250)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:243)
at java.lang.ClassLoader.loadClass(ClassLoader.java:372)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:344)
at java.lang.ClassLoader.loadClass(ClassLoader.java:313)
at com.crystaldecisions.sdk.plugin.desktop.program.internal.ProgramWrapper.main(ProgramWrapper.java:49)
and then I switched the compiler coompliance level to 1.7 and now Im getting this error
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/ghc/bo/extract/ExecuteExtract : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:735)
at java.lang.ClassLoader.defineClass(ClassLoader.java:716)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:336)
at java.net.URLClassLoader.access$000(URLClassLoader.java:59)
at java.net.URLClassLoader$1.run(URLClassLoader.java:250)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:243)
at java.lang.ClassLoader.loadClass(ClassLoader.java:372)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:344)
at java.lang.ClassLoader.loadClass(ClassLoader.java:313)
at com.crystaldecisions.sdk.plugin.desktop.program.internal.ProgramWrapper.main(ProgramWrapper.java:49)
I needed to set the compiler compliance level to 1.6. OMFG
This question already has answers here:
How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version
(51 answers)
Closed 8 years ago.
I created a jar file in my laptop and it runs fine in my computer without trouble but when i use the same in my friend's laptop it shows and exception and the file does not run. But it's still good with my laptop. What's the reason?
name of jar =BlueServer.jar
it has only one class.
classname=Server.java
one external library is used name=Bluecove.jar which is used for accessing bluetooth from java.
Ide used=Eclipse
used Eclipse for creating jar,already checked the option "Pacakage required libraries into generated jar"
This Error came while i try to run that same jar in another computer....
java -jar BlueServer.jar
Exception in thread "main" java.lang.UnsupportedClassVersionError: Server : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:56)
It is a problem with the version of the used JRE. See this post for details.
Try
java --version
on both machines.
This error indicates, that your file is not executable with the installed JRE version.
See How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version for more info about that.
java.lang.UnsupportedClassVersionError happens because of a higher JDK during compile time and lower JDK during runtime. Make sure the jdk version installed in your laptop is equal or higher than your friend's.