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I am trying to use as my all-in-one tool edit, run, compile, etc. I have installed, and I have setup my path variable to the./bin directory. When I run my 'Hello world' in Notepad, I get this message: java.lang.UnsupportedClassVersionError: testhelloworld: Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(Unknown Source).
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I think the problem here is about versions; some version of Java may be old or too new. How do I fix it?.
Should I install the JDK, and setup my path variable to the JDK instead of JRE?. What is the difference between the PATH variable in JRE or JDK? The version number shown describes the version of the JRE the class file is compatible with. The reported major numbers are: Java SE 11 = 55, Java SE 10 = 54, Java SE 9 = 53, Java SE 8 = 52, Java SE 7 = 51, Java SE 6.0 = 50, Java SE 5.0 = 49, JDK 1.4 = 48, JDK 1.3 = 47, JDK 1.2 = 46, JDK 1.1 = 45 (Source: ) To fix the actual problem you should try to either run the Java code with a newer version of Java JRE or specify the target parameter to the Java compiler to instruct the compiler to create code compatible with earlier Java versions.
For example, in order to generate class files compatible with Java 1.4, use the following command line: javac -target 1.4 HelloWorld.java With newer versions of the Java compiler you are likely to get a warning about the bootstrap class path not being set. More information about this error is available in blog post. This may occur when compiler source is set in non-compliance with currently compiling JRE/JDK. For example i found the below values from eclipse.settings folder, org.eclipse.jdt.core.compiler.compliance=1.7, org.eclipse.jdt.core.compiler.source=1.7, org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7. And my compiler was 1.6.032. The problem was resolved after changing the values to 1.6. The issue originated after i copied the project from a different workspace where i was using JDK 1.7:( – Dec 22 '14 at 6:22.
This error means you're trying to load a Java 'class' file that was compiled with a newer version of Java than you have installed. For example, your.class file could have been compiled for JDK 7, and you're trying to run it with JDK 6. So the solution is to either:. Upgrade your Java runtime or. Recompile the class if you have the source, using your local Java compiler (if you have one). Javac FileName.java For developers, this can happen if another developer checks in a.class file, and they've got a newer version of java than you have! You are trying to run your program with a Java version that does not support the version in which the code was compiled.
So basically you must have compiled your code with a higher version and trying to run it using a lower version. As you are getting Unsupported major.minor version 51.0 and version 51.0 corresponds to J2SE 7 you have most probably compiled your code in Java 7 and trying to run it using a lower version. Check what java -version displays. It should be the Java 7 version. If not make appropriate changes in the PATH/JAVAHOME. Or you can compile with the same version you are trying to run the code. If the configurations are confusing you can always give absolute path /home/user/jdk1.7.011/bin/javac and /home/user/jdk1.7.011/bin/java.
I had a similar situation on Mac, and the following process worked for me: In the terminal, type vi /.profile Then add this line in the file, and save export JAVAHOME=/Library/Java/JavaVirtualMachines/jdk.jdk/Contents/Home where version is the one on your computer, such as 1.7.025. Exit the editor, then type the following command make it become effective source /.profile Then type java -version to check the result java -version What is.profile file?.profile file is a hidden file.
It is an optional file which tells the system which commands to run when the user whose profile file it is logs in. For example, if my username is bruno and there is a.profile file in /Users/bruno/, all of its contents will be executed during the log-in procedure. The most common issue is misconfiguration of your JAVAHOME variable which should point to the right Java Development Kit library, if you've multiple installed.
To find where SDK Java folder is located, run the following commands: jrunscript -e 'java.lang.System.out.println(java.lang.System.getProperty('java.home'));' Debian/Ubuntu To check which java (openjdk) you've installed, check via: dpkg -l 'openjdk.' grep ^i or: update-java-alternatives -l To change it, use: update-alternatives -config java Prefix with sudo if required. To select the alternative java version.
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Or check which are available for install: apt-cache search ^openjdk Prefix with sudo if required. Then you can install, for example: apt-get install openjdk-7-jre Prefix with sudo if required.
Fedora, Oracle Linux, Red Hat Install/upgrade appropriate package via: yum install java-1.7.0-openjdk java-1.7.0-openjdk-devel The java-1.7.0-openjdk package contains just the Java Runtime Environment. If you want to develop Java programs then install the java-1.7.0-openjdk-devel package.
BSD There is an OpenJDK 7 package in the FreeBSD Ports collection called which probably needs to be reconfigured. Windows Just install appropriate Java SE Development Kit library from the or install Jenkins If you're experiencing this issue with Jenkins, see:. However selecting the right version of Java (newer) with update-alternatives should work. I have faced the same problem when I was working with an script to build my application. I use for my application development, and I changed the compiler version in build properties of the project.
But that didn't work for me. Then I found out that I can provide the compiler version in the Ant script.
I modified the Ant script at the section where it compile Java files. This worked for me to resolve the unsupported major minor issue. As answered elsewhere by several people, the Java program is being run on an older version of Java than the one it was compiled it for. It needs to be 'crosscompiled' for backward compatibility. To put it another way, there is a mismatch between source and target Java versions. Changing options in Eclipse menus don't answer the original poster, who said he/she is not using Eclipse.
On OpenJDK javac version 1.7, you can crosscompile for 1.6 if you use parameters -source and -target, plus provide the rt.jar -file of the target version (that is, the older one) at compile time. If you actually install the 1.6 JRE, you can point to its installation (for example, /usr/lib/jvm/java-6-openjdk-i386/jre/lib/rt.jar on Ubuntu, /usr/jdk/jdk1.6.060/jre/lib/rt.jar on SunOS apparently. Sorry, I don't know where it is on a Windows system).
Like so: javac -source 1.6 -target 1.6 -bootclasspath /usr/lib/jvm/java-6-openjdk-i386/jre/lib/rt.jar HelloWorld.java It looks like you can just download rt.jar from the Internet, and point to it. This is not too elegant though: javac -source 1.6 -target 1.6 -bootclasspath./rt.jar HelloWorld.java.