java.lang.unsupportedclassversionerror: blackboard/gradle/ideplugin

What is unsupportedclassversionerror in Java?

Jan 28, 2021 · Move to the directory and locate the bin directory. For example, if the JRE is in location like. C:\Program Files\Java\jdk-11.0.2, then navigate till C:\Program Files\Java\jdk-11.0.2\bin. Execute the program as. java // …

How to fix Java compiler not compatible with previous versions?

Apr 29, 2012 · 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 openjdk7 which probably needs to be reconfigured.

How to overcome “unsupportedclassversion” in Maven?

Mar 23, 2020 · 45 = Java 1.1 46 = Java 1.2 47 = Java 1.3 48 = Java 1.4 49 = Java 5 50 = Java 6 51 = Java 7 52 = Java 8 53 = Java 9 54 = Java 10 55 = Java 11 56 = Java 12 57 = Java 13 58 = Java 14 4. Fix Via Command Lines

Why is my Java class file not working?

2 answers. answered 2021-06-18 20:41 Deadron. One of your dependencies was compiled to target Java 11 and can't be loaded into a older JRE. Given the package of the class that failed to load you should look for org.eclipse.core dependencies.

Fedora, Oracle Linux, Red Hat

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.

Windows

Just install appropriate Java SE Development Kit library from the Oracle site or install

Jenkins

However selecting the right version of Java (newer) with update-alternatives should work.

1. Introduction

From API: Thrown when the Java Virtual Machine attempts to read a class file and determines that the major and minor version numbers in the file are not supported.

2. Runtime Error

Now look at the error and try to understand the reason behind it. It is clearly stating that class is compiled in one version and you are trying to run in a different version.

3. Look at the java version numbers

Every java release will come with a standard major version number. This will be handy when dealing with error messages.

4. Fix Via Command Lines

Let us see how we can resolve this error using the command line in mac or windows.

4.1 Check and update the java version

If you want to update the java version then install the latest java version and set to JAVA_HOME.

5. Eclipse IDE

Need to change the JRE to a higher version or Java compiler to an older version in eclipse project settings. Select the project press alt + enter (windows) or command + i (mac) to open properties.

7. Maven Properties

When using Java 8 or older, we set the source and target for the compiler plugin in the pom.xml file.

Introduction

A Look at The Error

Fix Via The Command Line

• Now let's discuss how we can resolve this error when running Java from the command line. Depending on our situation, we have two ways we can resolve this error: compile our code for an earlier version of Java, or run our code on a newer Java version. The final decision depends on our situation. If we need to use a third-party library that's already...

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Eclipse IDE

Maven

Conclusion