Java Programming

Hi All,
I have a tomcat plugin inside Eclipse 3.4.2. Recently I upgraded from Java 5 to Java 6. When I try to start Tomcat from Eclipse,I get the following error:
Error occurred during initialization of VM
java.lang.UnsatisfiedLinkError: java.lang.Float.floatToIntBits(F)I
at java.lang.Float.floatToIntBits(Native Method)
at java.lang.Math.<clinit>(Math.java:801)
at sun.net.www.ParseUtil.lowMask(ParseUtil.java:512)
at sun.net.www.ParseUtil.<clinit>(ParseUtil.java:559)
at sun.misc.Launcher.getFileURL(Launcher.java:388)
at sun.misc.Launcher$ExtClassLoader.getExtURLs(Launcher.java:165)
at sun.misc.Launcher$ExtClassLoader.<init>(Launcher.java:137)
at sun.misc.Launcher$ExtClassLoader$1.run(Launcher.java:121)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.Launcher$ExtClassLoader.getExtClassLoader(Launcher.java:118)
at sun.misc.Launcher.<init>(Launcher.java:51)
at sun.misc.Launcher.<clinit>(Launcher.java:39)
at java.lang.ClassLoader.initSystemClassLoader(ClassLoader.java:1304)
at java.lang.ClassLoader.getSystemClassLoader(ClassLoader.java:1286)

Kindly suggest what needs to be done? If I am posting it in a wrong forum please suggest me the right one too.
I would like to know if Eclipse 3.4 and Java 6 are compatible or not.

Thanks in advance.