Comments on: Resolving the “Unsupported major.minor version 49.0″ Error

By: Ferry

Ferry — Tue, 10 Aug 2010 15:07:17 +0000

Thanks Buddy !!!

By: Helgi Hrafn Gunnarsson

Helgi Hrafn Gunnarsson — Fri, 11 Jun 2010 21:29:51 +0000

I wonder why the bloody error doesn’t say that then.

Well, thanks!

By: zhayne

zhayne — Wed, 19 May 2010 08:28:50 +0000

i also got this error but only in one computer wherein the program will be used. in three other computers, it works perfectly! the weird thing is, all four computers were installed using the same Java executables. It’s really just that one computer..

By: zhayne

zhayne — Wed, 19 May 2010 08:27:40 +0000

i also got this error but only in one computer wherein the program will be used. in four other computers, it works perfectly! the weird thing is, all four computers were installed using the same Java executables. It’s really just that one computer..

By: Fritz

Fritz — Tue, 22 Sep 2009 21:16:24 +0000

Your advice really helped me.

Thanks a lot.

By: rajesh

rajesh — Thu, 27 Aug 2009 04:50:21 +0000

Hi I was facing this error
javax.servlet.ServletException: org/apache/jsp/instance_005fconstants_jsp (Unsupported major.minor version 49.0)

in application after doing that is descrive it really help me

By: Hakan

Hakan — Thu, 05 Feb 2009 13:14:57 +0000

Thanks Aruna,

Your tips helped me much to fix the linkage issue in RAD7.

Cheers
Hakan

By: faithict

faithict — Wed, 23 Apr 2008 19:00:18 +0000

I am still getting the same error. I installed jre1.6 and also jdk 1.6 and i checked with java -version and it is showing that i am having jre1.6. However I am still getting this error. Please advice.

[Analyzing Version 2] java.lang.UnsupportedClassVersionError: jdiff/JDiff (Unsupported major.minor version 49.0)
[Analyzing Version 2] at java.lang.ClassLoader.defineClass0(Native Method)
[Analyzing Version 2] at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
[Analyzing Version 2] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
[Analyzing Version 2] at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
[Analyzing Version 2] at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
[Analyzing Version 2] at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
[Analyzing Version 2] at java.security.AccessController.doPrivileged(Native Method)
[Analyzing Version 2] at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
[Analyzing Version 2] at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
[Analyzing Version 2] at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
[Analyzing Version 2] at com.sun.tools.javadoc.DocletInvoker.(DocletInvoker.java:69)
[Analyzing Version 2] at com.sun.tools.javadoc.Start.setDocletInvoker(Start.java:343)
[Analyzing Version 2] at com.sun.tools.javadoc.Start.parseAndExecute(Start.java:170)
[Analyzing Version 2] at com.sun.tools.javadoc.Start.begin(Start.java:121)
[Analyzing Version 2] at com.sun.tools.javadoc.Main.execute(Main.java:41)
[Analyzing Version 2] at com.sun.tools.javadoc.Main.main(Main.java:31)
[Analyzing Version 2] javadoc: fatal error

By: Adriana

Adriana — Wed, 19 Mar 2008 20:50:52 +0000

Thank you. I spent half a day trying to figure this one out.

By: Aruna

Aruna — Mon, 10 Mar 2008 19:39:28 +0000

I had similar issue with RAD7.x and found that irrespective of what is set in JAVA_HOME , you have to do the following things too
1. Right click on your webproject > Properties > Project Facets > Set Java version 1.4
2. Select Java compiler (in same window) > Select the “JDK Compliance” to 1.4
3. Last, select Windows preference in RAD > Java > Installed JREs > Ensure its set to JDK 1.4

Thanks Nitin !

Aruna