Unbale to start tomcat 6 after RAM + JVM upgradation

I have upgraded Windows XP - PC RAM from 1GB to 3GB. Since JVM had some problem Eclipse Helios, I had to reinstall it and I did clean installation.

I have installed jdk7( jdk-7-ea-bin-b88-windows-i586-08_apr_2010.exe ). Now my tomcat( Apache Tomcat Version 6.0.16 ) doesn't start. Log says

java.lang.UnsupportedClassVersionError: 
javax/management/MalformedObjectNameException : 
Unsupported major.minor version 51.3

So I installed latest version of Tomcat i.e. Tomcat-6.0.29. Log says

java.lang.ClassFormatError: 
Incompatible magic value 1853108037 in class file java开发者_JS百科x/management/MXBean

Thanks a lot for help.

Yeah it looks like Tomcat isn't compatible with JDK7 This to me says there are bugs