How to Fix Java.Lang.Unsupportedclassversionerror: Unsupported Major.Minor Version

How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version

The version number shown describes the version of the JRE the class file is compatible with.

The reported major numbers are:

Java SE 18 = 62,
Java SE 17 = 61,
Java SE 16 = 60, 
Java SE 15 = 59,
Java SE 14 = 58,
Java SE 13 = 57,
Java SE 12 = 56,
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: Wikipedia)

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 a blog post New javac warning for setting an older source without bootclasspath.

How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version

The version number shown describes the version of the JRE the class file is compatible with.

The reported major numbers are:

Java SE 18 = 62,
Java SE 17 = 61,
Java SE 16 = 60, 
Java SE 15 = 59,
Java SE 14 = 58,
Java SE 13 = 57,
Java SE 12 = 56,
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: Wikipedia)

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 a blog post New javac warning for setting an older source without bootclasspath.

What does 'Unsupported major.minor version 52.0' mean, and how do I fix it?

You don't need to change the compliance level here, or rather, you should but that's not the issue.

The code compliance ensures your code is compatible with a given Java version.

For instance, if you have a code compliance targeting Java 6, you can't use Java 7's or 8's new syntax features (e.g. the diamond, the lambdas, etc. etc.).

The actual issue here is that you are trying to compile something in a Java version that seems different from the project dependencies in the classpath.

Instead, you should check the JDK/JRE you're using to build.

In Eclipse, open the project properties and check the selected JRE in the Java build path.

If you're using custom Ant (etc.) scripts, you also want to take a look there, in case the above is not sufficient per se.

Problems fixing java.lang.UnsupportedClassVersionError: Unsupported major.minor version 52

UnsupportedClassVersionError is always due to the fact that a class was compiled with a Java version greater than the Java version being used to run it.

When you have an IDE, an app server like Tomcat and other things, you may have several settings that must point to a JDK (with the JAVA_HOME environment variable being the most important). If they all point to the correct place, there's no problem, however there are possibilities for errors such as:

• Setting points to JRE instead of JDK

This causes problems when there's a need for javac which doesn't exist in the JRE. For example Tomcat needs javac to compile things, so JRE is not enough.

• Setting points to a different JDK than other settings

This causes the UnsupportedClassVersionError, and then you need to find which setting is wrong. Often JAVA_HOME points to the correct place, but a different setting points to an older JDK. A common problem is having JAVA_HOME point to Oracle's JDK and Tomcat pointing to OpenJDK.

Since you can use -source and -target flags to compile for older versions, you don't need to keep more than one JDK on your system. Remove the old ones and the chances for mysterious errors diminish.

Unsupported major.minor version 52.0 in java

This is because On your system javac utility is pointing to Java 1.8 but java utility is pointing to Java 1.7.

To resolve it do following:

Note: I'm assuming that you are working on Windows OS.

• In PATH variable, remove the very first path, if it looks like ...\Oracal\javapath
• Set JDK_HOME and JRE_HOME for Java 1.7

java.lang.UnsupportedClassVersionError: Unsupported major.minor version 51.0

clearly, your Java runtime evnironment is different from that of compile time version

For me this solved the problem:
I have a 64-bit system with jdk1.7 (32bit) and jdk1.6 (64 bit) installed. Even though I had specified PATH and JAVA_HOME for jdk1.7, my java -version was 1.6

• I removed the folder in which jdk1.6 was installed

. The problem was gone. Apparently, a 64 bit system gave preference to jdk1.6(64bit) instead of jdk1.7(32bit)

For more info, refer: How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version

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