I am trying to install apache james 3.3.0 in windows 7 service pack 1, in which both jd 1.7, and 1.8 already installed. But while running the james i am getting the below error.
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/ja
mes/app/spring/JamesAppSpringMain : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
jdk installation directory
This error comes from lower version of jvm. It means you are trying to run java 8 compiled jar with java 7 jvm.
Therefore java 7 says that class version is not recognized. You need to configure JAVA_HOME points 8 then re-run.
You can find what class version is supported by which jvm https://en.wikipedia.org/wiki/Java_class_file#General_layout
This worked for me: I added
wrapper.java.command=/toolbox/jdk1.8.0_192/bin/java
near the top of conf/wrapper.conf .
Related
I've been trying to run a jar file with a class version 59.0, however it always gives me a JNI error saying I can only run class file versions up to 52.0
This is weird because I am on the latest version of Java and have restarted my computer.
This is the error:
Exception in thread "main" java.lang.UnsupportedClassVersionError: MapConverter has been compiled by a more recent version of the Java Runtime (class file version 59.0), 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.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Please help!
Nevermind, I was downloading the "latest" version of java from the wrong page. I'm running Java 8.
After using launch4j to convert my jar file into exe it gives me a JNI error that tells me to check my installation and try again after that it gives me another warning that says a java exception occured.
I've tried different ways such as choosing different options but it still doesn't work.
here is the log:
Exception in thread "main" java.lang.UnsupportedClassVersionError: fluidDynamicsProject/FluidDynamicSerial 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
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
It means that the version of the JVM that is used by launch4j to run the program is less recent than the version of the compiler that compiled class fluidDynamicsProject/FluidDynamicSerial. You can try to set the minimum version in the launchj4 configuration file:
<?xml version="1.0" encoding="UTF-8"?>
<launch4jConfig>
...
<jre>
...
<minVersion>11.0</minVersion>
...
</jre>
</launch4jConfig>
Note that it's possible that launch4j doesn't support the latest versions of Java.
Or else, you can lower the target version you use to compile your classes.
I am using netbeans IDE.I have imported a animation.jar in my project for better gui experience,if i execute it in netbeans,it works fine.But, after i compiled and build the project.I copied the dist folder to desktop and run my project the animation is no longer running please help me,thanks in advance,sorry for bad english.
this are the errors sir after i convert it to .exe app using launch4j. I bundled it in jre6..in jre1.8 ir latest jre the problem is the my switching icons are not working..
Executing: C:\Users\syracuse\Desktop\dist\Alumni.exe
Exception in thread "main" java.lang.UnsupportedClassVersionError: AppPackage/AnimationClass : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at sun.misc.Launcher$ExtClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at alumni.login.<init>(login.java:28)
at alumni.Alumni.main(Alumni.java:18)
I've got an install4j question.
I was wondering if it is possible to update the bundled JRE of an application that is already installed.
For example, in our application we had a bundled java 6. Now, we upped the minimum version to java 7 and we bundle JRE 8.
For new installations this works fine. But with existing installs, but JRE 8 is not downloaded in the update process, and after updating the application gives an error at startup:
java.lang.UnsupportedClassVersionError: camMan/shared/E/p : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at camMan.c.b.s.<clinit>(Unknown Source)
at camMan.unsecure.LoginLauncher.main(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.exe4j.runtime.LauncherEngine.launch(Unknown Source)
at com.exe4j.runtime.WinLauncher.main(Unknown Source)
at com.install4j.runtime.launcher.WinLauncher.main(Unknown Source)
I'm using install4j version 5.1.15.
- We use a dynamic bundle (download on demand)
- "install as a shared JRE" is disabled
- "install only if no other suitable JRE is found" is enabled.
Thanks in advance!
This question already has answers here:
How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version
(51 answers)
Closed 8 years ago.
While running Java program it is giving me and minor.major version mismatch error. I have JRE6.0 installed in my PC and no JDK version installed.
The exception which I am getting is:
Exception in thread "main" java.lang.UnsupportedClassVersionError: otaclient/ClassFactory : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at Intergrate.main(Intergrate.java:13)
Thanks in advance.
The code seems to be compiled on JDK 1.7. You need to be upgrade your JRE to run this code
That class is compiled with a JDK 7, try it yourself. Run:
javap -verbose otaclient.ClassFactory
If you see 'major version: 51', it is was compiled with a JDK 1.7, see the Version of Class File section.
I think the code you're trying to run was compiled with JDK 1.7, so you should upgrade your machine JRE to 1.7 or 1.8 to run it.