unsupported major minor version 51.0 gwt eclipse

Minor version.0 at fineClass1(Native Method) at at at at at n(urlclassLoader.
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Make sure to install the same JDK version for building your Java application as you are going to run in production.In short, you are getting this error because it is compiled with Java 8, source version 52 corresponds to Java.8 release but you are trying to run this program in lower JRE.g.As I said earlier, there are two ways to fix "Unsupported major.Same is the case with an applet compiled in JDK.8, running in a browser with JRE.7.Wikipedia Java class reference.So, for example, you can generate a Java class file for JDK.4 by running javac command with -target option as shown below : javac -target.4 HelloWorld.Let's understand the cause and solution.In Eclipse, if you are compiling your Java program in Eclipse central brain identifier portable and running it from command line, then you have the option to compile Java files for target environment.You can change compiler setting in Eclipse by selecting your project, properties, java compiler and unchecked JDK compliance checkbox to change the Compiler compliance level.Your production is running on JDK.6 and your latest release is failing due to "Unsupported major.Java:212) at Privileged(Native Method) at at at at A quick check on the Java version, shows the Debian is using.6 java -version java version "1.6.0_31 openJDK Runtime Environment (IcedTea6.13.3) (6b31-1.13.3-1deb7u1).Java, the ass file generated by this command can be run in any version of Java.4 onward.g.Minor version.0 comes when you are trying to run a class compiled using Java.8 compiler into a lower JRE version.g.If you run this class file in JRE 7, you will get "Unsupported major.Main reason of this error is that during compilation, you have used a higher version of JDK but during deployment, you have deployed into a lower version of JDK or JRE.Selection Path Priority Status 1061 auto mode 1 1061 manual mode 2 1051 manual mode.
Choose Java Compiler, uncheck JDK compilance check box, that's all about how to fix Unsupported major.
Cause of Unsupported major.




You can get unsupported major.If you are getting HelloWorld unsupported major.This is also necessary if you are exporting JARs from Eclipse.Because higher version usually have features which are not supported by lower version.Here is the screenshot of changing compiler compliance level in Eclipse : Select your project, right click, select properties.Here are the major version of every JRE released so far : Java SE 8 52, Java SE 7 51, Java.0 50, Java.0 49, JDK.4 48, JDK.3 47, JDK.2 46, JDK.1 45, you can see that Java.Your only option is to upgrade the JRE plugin of your browser to Java.Problem, run a jar on Debian.5, and hits the following error messages : java -jar ripecrawler.Java.4, Java 5 or Java.TL:DR; upgrade to Java 8 or compile for lower JRE version using java -target.6 option.