How To Resolve Java.Lang.Unsupportedclassversionerror Amongst Example

java.lang.UnsupportedClassVersionError  is a quite mutual fault afterward NoClassDefFoundError or ClassNotFoundException they all seems to related to degree files but they all are unlike in addition to at that spot drive in addition to resolution are different. In this coffee tutorial nosotros volition catch what is UnsupportedClassVersionError in Java? Why UnsupportedClassVersionError comes inwards Java? What is degree file format in addition to version numbers associated alongside it in addition to lastly how to resolve UnsupportedClassVersionError in Java. 

This article is inwards continuation of debugging tutorials similar How to remote debug Java computer program inwards Eclipse in addition to 10 Java debugging tips inwards Eclipse. If you lot convey non read those article you lot may bring out them useful.

 

How to resolve UnsupportedClassVersionError inwards Java

What is UnSupportedClassVersionError inwards Java?

or ClassNotFoundException they all seems to related to degree files but they all are diffe How to resolve java.lang.UnsupportedClassVersionError alongside exampleJava.lang.UnsupportedClassVersionError is a subclass of java.lang.ClassFormatError. This is a sort of linking fault which occurs during linking stage accordingly java.lang.ClassFormatError has besides derived from java.lang.LinkageError. As the lift suggests "UnSupportedClassVersionError" in addition to thus it’s related to unsupported degree version, immediately questions comes what is degree version inwards Java? Well every source file is compiled into degree file in addition to each degree file has 2 versions associated alongside it, major version in addition to tiddler version. 

 The Version of degree file is represented equally major_version.minor_version. This version is used to create upward one's heed format of degree file inwards Java.



According to Java Virtual Machine specification, “A JVM implementation tin back upward a degree file format of version v if in addition to solely if v lies inwards closed to contiguous hit Mi.0 v Mj.m. Only Sunday tin specify what hit of versions a JVM implementation conforming to a certainly unloose bird of the Java platform may support.” For example: JDK 1.2 supports degree file formats from version 45.0 to version 46.0 inclusive. So if a degree file has version 48.0 it agency that major version of degree file is "48" in addition to tiddler version is "0", which tells us that JDK 1.4 has been used to compile in addition to generate that degree file.



When UnSupportedClassVersionError inwards Java comes:

So immediately nosotros got the theory behind degree file format in addition to major in addition to tiddler version of degree file inwards Java. Now a i one k thousand dollar query is when UnSupportedClassVersionError inwards Java does occur?  precise response of this is "When JVM tries to charge a degree in addition to institute that degree file version is non supported it throws UnSupportedClassVersionError in addition to it to a greater extent than oft than non occurs if a higher JDK version  is used to compile the source file and  a lower JDK version is used to run the program. for instance if you lot compile your coffee source file inwards JDK 1.5 in addition to you lot volition elbow grease to run it on JDK 1.4 you lot volition instruct fault "java.lang.UnsupportedClassVersionError: Bad version number inwards .class file [at java.lang.ClassLoader.defineClass1(Native Method)]".

But its of import to banking concern complaint is that vice-versa is non truthful "you tin compile your computer program inwards J2SE 1.4 in addition to run on J2SE 1.5 in addition to you lot volition non instruct whatsoever UnSupportedClassVersionError". When a higher JDK is used for compilation it creates degree file alongside higher version in addition to when a lower JDK is used to run the computer program it institute that higher version of degree file non supported at JVM bird in addition to results inwards java.lang.UnsupportedClassVersionError.


How to laid upward UnSupportedClassVersionError

Now nosotros know the root drive of UnSupportedClassVersionError that nosotros are using a lower JVM for running the program. But major work is that stack delineate of UnSupportedClassVersionError volition non say you lot for which degree it’s coming. So if you lot are using multiple 3rd political party jars inwards your application you lot bring out that it comes at a detail business office when JVM tries to charge a degree from a detail jar. anyway nosotros all know that latest version of JDK is 1.6 in addition to thus maximum version of degree file could live generated yesteryear JDK 6, in addition to thus yesteryear using JDK half-dozen nosotros tin solve UnSupportedClassVersionError, but many times its non tardily to only movement to higher JDK version. So I would suggest:

1) Find out due to which jolt or degree file this UnSupportedClassVersionError is coming?
2) Try to compile source code of that jolt alongside the JDK version you lot are using to run your program, if source is available.
3) If you lot don't convey source elbow grease to bring out the compatible version of that library.
4) Increase the JRE version you lot are using to run your program.

You tin become yesteryear whatsoever approach to resolve UnSupportedClassVersionError based upon your need. Generally a higher JVM version is ok in addition to does non drive whatsoever work unless the degree file format is quite quondam in addition to no to a greater extent than supported yesteryear Sunday inwards higher JVMs. The best way to bargain alongside UnSupportedClassVersionError inwards Java is to run same version or JDK in addition to JRE for compiling in addition to running your program.



Example of UnSupportedClassVersionError inwards Java

You tin easily reproduce UnSupportedClassVersionError yesteryear using javac of higher JDK in addition to "java" from lower Java version. Let’s catch closed to of examples of UnSupportedClassVersionError inwards Java:

1) java.lang.UnsupportedClassVersionError: EquityTradingManager (Unsupported major.minor version 49.0)
      at java.lang.ClassLoader.defineClass0(Native Method)
      at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
==>Since nosotros know that major version 49 is supported yesteryear JDK 1.5, in addition to thus these volition "java.lang.UnsupportedClassVersionError” volition come upward if JVM used to run this computer program is lower than Java 1.5.

2) Java.lang.UnsupportedClassVersionError: Bad version number inwards .class file

3) java.lang.unsupportedclassversionerror unsupported classversion 50.0
==> Compile inwards JDK 1.6 in addition to running on lower version than Java 6.

4) java.lang.unsupportedclassversionerror unsupported classversion 49.0
==> compiled inwards Java five in addition to running on lower JVM than JDK 5.

5) java.lang.unsupportedclassversionerror bad version number inwards eclipse.
or ClassNotFoundException they all seems to related to degree files but they all are diffe How to resolve java.lang.UnsupportedClassVersionError alongside example
==> Most of us run eclipse for edifice in addition to running projection closed to of us besides run emmet for edifice project. In eclipse at that spot is closed to setting related to coffee source version which if you lot got wrong tin number inwards "java.lang.unsupportedclassversionerror bad version number". in addition to thus brand certainly you lot convey right configuration. For instance if you lot compile alongside source compatible 1.6 you lot request JRE half-dozen to execute the program. To banking concern fit the compiler setting inwards eclipse become to project  ==>Properties==>Java Compiler equally shown inwards image





Important indicate nearly UnSupportedClassVersionError inwards Java:

1) If you lot meet UnSupportedClassVersionError, banking concern fit the JRE version you lot are using to run computer program in addition to switch to higher version for quick solution.
2) java.lang.UnsupportedClassVersionError is derived from java.lang.LinkageError, in addition to thus it volition non live detected inwards compile fourth dimension in addition to it volition solely come upward on runtime, exactly when JVM tries to charge a class.
3) Class file format which is identified using major version in addition to tiddler version. Class file format is assigned when you lot compile source file in addition to its depends on JDK version used to compile.
4) Its ever best do to run same version of coffee for compilation in addition to execution to avoid whatsoever run a jeopardy of UnSupportedClassVersionError.
5) UnSupportedClassVersionError is non related to java classpath , in addition to thus don't confuse this alongside NoClassDefFoundError or ClassNotFoundException.

Major Class Versions of Various JDK

Following are the major version of class file format inwards criterion JDK environment.

JDK 1.1 = 45
JDK 1.2 = 46
JDK 1.3 = 47
JDK 1.4 = 48
JDK 1.5 = 49
JDK 1.6 = 50

You tin besides instruct version of "javac" (used for compilation) in addition to version of "java" (used for execution) equally below
C:\equity trading\stocks>javac -version
javac 1.6.0-beta2

C:\equity trading\stocks>java -version
java version "1.6.0-beta2"
Java(TM) SE Runtime Environment (build 1.6.0-beta2-b86)
Java HotSpot(TM) Client VM (build 1.6.0-beta2-b86, mixed mode, sharing)

Now you lot tin position your JDK version based on degree file format version whenever you lot catch java.lang.UnsupportedClassVersionError :)

Further Learning
Complete Java Masterclass
how coffee hashmap works, why String is immutable inwards java, why await in addition to notify needs to telephone telephone from synchronized context  interesting.

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