java.lang.UnsupportedClassVersionError: Bad version number in .class file
[at java.lang.ClassLoader.defineClass1(Native Method)]
is an error that you may face in running a compiled java class file.
So as you can see from the stack trace, a class has not been loaded. But which class? The problem is this error message does not show the name of the failed .class, isn't it?
No, it is not. This error is caused when you compile a .java file with one version of JDK and running the .class file with a different version of JVM.
Confused? You may say; same version is not required to compile and run.
Yes, that is true. But you can not run .class files that are compiled with a newer version than the JVM.
Say;
Now you know how to solve this issue, isn't it?
[at java.lang.ClassLoader.defineClass1(Native Method)]
is an error that you may face in running a compiled java class file.
So as you can see from the stack trace, a class has not been loaded. But which class? The problem is this error message does not show the name of the failed .class, isn't it?
No, it is not. This error is caused when you compile a .java file with one version of JDK and running the .class file with a different version of JVM.
Confused? You may say; same version is not required to compile and run.
Yes, that is true. But you can not run .class files that are compiled with a newer version than the JVM.
Say;
javac (compile) - version: XIf X is newer than Y; then you may face this issue at runtime.
java (run) - version: Y
Now you know how to solve this issue, isn't it?
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I tried 2 run some class files on java 1.5 I received from a friend and faced this error. Thanks for pointing the solution.
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It's crystal clear explanation. bunch of thanks Kamal.
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Thanks Kamal! Your post helped me.
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Dear Friend im facing the same problem but as u explaned i dont know how to use these commands plz help
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Hello friend,
Please check the versions of javac and java on your computer and post them here, then we'll create the required commands. -
Wow cool
I can fix my problem by you posted -
how is it that i remember being able to issue a "javac -version" before that worked, but now i can't figure out how to check my compiler version?
java -version (always works)
javac -version (now never works)
darksalmon -
java version "1.6.0_12"
Java(TM) SE Runtime Environment (build 1.6.0_12-b04)
Java HotSpot(TM) Client VM (build 11.2-b01, mixed mode, sharing)
javac 1.6.0_12
I got the versions as above, but still getting this error. I have tried compiling it with or without -cp option, but it is still failing to run. I am able to get this to work from another workstation. Can you please help? -
im facing the same problem but when i installed 1.5 it didnt showed any error but at run time it is showing the error
and java -version is showing 1.3.1 version -
i installed latest 1.6 jvm and jre. javac -version is showing 1.6 but java -version is still showing 1.3 may be older version is not unistalled properly. help me
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Hi Satyam,
Best thing to resolve this would be, first remove all jre/jdk installations. (Better not to install two different versions on one machine.)
Then check for versions of both. That way you will be able to resolve this issue. -
I am getting this error for groovy 1.6.0.
java.lang.UnsupportedClassVersionError: org/codehaus/groovy/tools/GroovyStarter (Unsupported major.minor version 49.0)
and my java -version is java version "1.6.0_11"
Any thoughts? -
I think 49.0 => Java 1.5 ... are you sure all were recompiled?
Doesn't it identify the bad class file? -
I got the same exception and I solved it
java.lang.UnsupportedClassVersionError: Bad version number in .class file
[at java.lang.ClassLoader.defineClass1(Native Method)]
I was using JDK 1.5
I was trying to connect from eclipse using "postgresql-8.3-603.jdbc4.jar"
this driver. This jdbc driver.
After the error message i went to http://jdbc.postgresql.org/download.html
and found a compatibility list like this
* JDK 1.1 - JDBC 1. Note that with the 8.0 release JDBC 1 support has been removed, so look to update your JDK when you update your server.
* JDK 1.2, 1.3 - JDBC 2.
* JDK 1.3 + J2EE - JDBC 2 EE. This contains additional support for javax.sql classes.
* JDK 1.4, 1.5 - JDBC 3. This contains support for SSL and javax.sql, but does not require J2EE as it has been added to the J2SE release.
* JDK 1.6 - JDBC4. Support for JDBC4 methods is limited. The driver builds, but the majority of new methods are stubbed out.
So i used "postgresql-8.3-604.jdbc3.jar" instead of jdbc4.
And then my connection was found by eclipse ran without any problem -
Thanks!
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thanks for the tips.
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I have the same problem. But i have java version 1.5.0_21 and jvm is the same but in eclipse when i start tomcat this error happens.
Any idea?
I have check everything related to java so all is pointing to this version
Thanks in advance -
// Tomcat and java version 1.5.0_21
Can you try starting Tomcat without the projects that you have deployed there? Then you will be able to locate the web application that causes this error. -
Loud and clear..Thank you
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Thankyou yaar!
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If you get this in ECLIPSE. Look at the javac compliance under Windows->Preferences->Java->Compiler and make sure its the same as Eclipse's default JRE version.
This was driving me nuts - until I saw my Eclipse JRE was 1.5 and this setting was at 1.6!!!! -
thank you for the post I find it usefull.
I find that a few days before I had installed Zend Studio on Windows 7, while replacing my JRE becoz Zend studio does't work well on this window and currently this is the one way to get it work well on Win7.
Kamal Mettananada is a Software Architect, Java Explorer and Blogger. Digizol consists of computer related articles, tutorials, tips and other information.
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