Bad Class Version Error In Java

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Java Unsupported Class Version Error 52

in class file up vote 5 down vote favorite 2 When I use certain jars in one of the connector projects i write for lombardi in TeamWorks eclipse i get a bad class version exception... any ideas how this might be resolved..

Java Lang Unsupported Class Version Error

Regards, Adhir java share|improve this question asked May 11 '09 at 11:13 Adhir 3502720 add a comment| 5 Answers 5 active oldest votes up vote 13 down vote You will get this error if you are using (say) Java 1.5 and you are using a JAR compiled with Java 1.6. The easiest way to resolve is to upgrade your version of Java to the one used by the JAR. share|improve this answer answered May 11 '09 at 11:16 Simon Nickerson 23.9k1469114 1 you can eclipse bad version number in class file recompile and set the compiler to compile it for Java 1.5 if your target machine uses that version –eradicus May 11 '09 at 11:22 Setting the target version doesn't check for method/classes added in the newer version. i.e. it doesn't check @since So using Java 6 you can compile code with target of 1.5, but if you have used String.getBytes(Charset) for example, you will get an error. –Peter Lawrey May 11 '09 at 20:15 +1. This is the onw that is experianced in most of the times. –namalfernandolk Apr 10 '14 at 9:02 add a comment| up vote 2 down vote Try to compile/recompile all your stuff with the same compiler. Typically this happens when you have something compiled with a higher version and you try to run it with an older one. share|improve this answer answered May 11 '09 at 11:21 Luixv 3,9771354103 add a comment| up vote 1 down vote This problem can also be caused by an expired (365-day) Android certificate referenced by Eclipse. See "Debug certificate expired" error in Eclipse Android plugins for details. share|improve this answer edited Mar 16 '12 at 20:39 Peter O. 16.1k74861 answered Mar 18 '11 at 17:27 Kirk A 12114 add a comment| up vote 0 down vote This is a result of running code compiled with a compiler version that is greater than the version of java you are using to run it. IE Code compiled with 1.6 and you are running it with 1.5. See this post to determ

This Site Careers exception in thread main java lang unsupportedclassversionerror bad version number in class file Other all forums Forum: Servlets Getting error: Bad version bad version number in .class file maven number in .class file Mayank Kalbhor Greenhorn Posts: 17 posted 5 years ago http://stackoverflow.com/questions/847652/bad-version-in-class-file Hi all, Need some help. I created a simple servlet from VTC tutorials. The problem i compile the servlet and put it in exact directories mentioned in the tutorial https://coderanch.com/t/528752/Servlets/java/error-Bad-version-number-class but after deployment of the app(war file) in j2ee web container i am getting this error. java.lang.UnsupportedClassVersionError: Bad version number in .class file java.lang.ClassLoader.defineClass1(Native Method) java.lang.ClassLoader.defineClass(ClassLoader.java:620) java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1798) org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:910) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1375) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1239) org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:189) com.sun.enterprise.web.connector.grizzly.ProcessorTask.doProcess(ProcessorTask.java:604) com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:475) com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:371) com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:264) com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:281) com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:83) after googling I came to know this happens due to conflicting versions of java while compiling and running. I am using "C:\Program Files\Java\jdk1.6.0_21" as JDK and "j2eesdk-1_4_03-windows" as the container. Can you please how can i downgrade the JDK path in EV.? How can i mat

with example java.lang.UnsupportedClassVersionError is a quite common error after NoClassDefFoundError or ClassNotFoundException they all seems to related to class files but they all are different and there cause and http://javarevisited.blogspot.com/2011/07/javalangunsupportedclassversionerror.html resolution are different. In this java tutorial we will see what is UnsupportedClassVersionError in Java? Why UnsupportedClassVersionError comes in Java? What is class file format and version numbers associated with it https://www.eclipse.org/forums/index.php/t/106350/ and finally how to resolve UnsupportedClassVersionError in Java. This article is in continuation of debugging tutorials like How to remote debug Java program in Eclipse and 10 Java debugging tips bad version in Eclipse. If you have not read those article you may find them useful. How to resolve UnsupportedClassVersionError in Java What is UnSupportedClassVersionError in Java? Java.lang.UnsupportedClassVersionError is a subclass of java.lang.ClassFormatError. This is a kind of linking error which occurs during linking phase accordingly java.lang.ClassFormatError has also derived from java.lang.LinkageError. As the name suggests "UnSupportedClassVersionError" so it's related to unsupported bad version number class version, now questions comes what is class version in Java? Well every source file is compiled into class file and each class file has two versions associated with it, major version and minor version. The Version of class file is represented as major_version.minor_version. This version is used to determine format of class file in Java. According to Java Virtual Machine specification, "A JVM implementation can support a class file format of version v if and only if v lies in some contiguous range Mi.0 v Mj.m. Only Sun can specify what range of versions a JVM implementation conforming to a certain release level of the Java platform may support." For example: JDK 1.2 supports class file formats from version 45.0 to version 46.0 inclusive. So if a class file has version 48.0 it means that major version of class file is "48" and minor version is "0", which tells us that JDK 1.4 has been used to compile and generate that class file. When UnSupportedClassVersionError in Java comes: So now we got the theory behind class file format and major an

Things LocationTech Long-Term Support PolarSys Science OpenMDM More Community Marketplace Events Planet Eclipse Newsletter Videos Participate Report a Bug Forums Mailing Lists Wiki IRC How to Contribute Working Groups Automotive Internet of Things LocationTech Long-Term Support PolarSys Science OpenMDM Toggle navigation Home Projects Forums Eclipse Community Forums Forum Search: Search Help Register Login Home Home» Eclipse Projects» Eclipse Platform» java.lang.UnsupportedClassVersionError: Bad version number in .class file Show: Today's Messages :: Show Polls :: Message Navigator java.lang.UnsupportedClassVersionError: Bad version number in .class file [message #325131] Sun, 10 February 2008 11:02 Eclipse User Originally posted by: agostinacchio.gmail.com Hi all, I tried to run my program but I recieved this message: java.lang.UnsupportedClassVersionError: Bad version number in .class file at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:620) at java.security.SecureClassLoader.defineClass(SecureClassLoade r.java:124) at java.net.URLClassLoader.defineClass(URLClassLoader.java:260) at java.net.URLClassLoader.access$100(URLClassLoader.java:56) at java.net.URLClassLoader$1.run(URLClassLoader.java:195) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268 ) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319 ) Exception in thread "main" can anyone help me, please? Report message to a moderator Re: java.lang.UnsupportedClassVersionError: Bad version number in .class file [mess