When i run my war file in tomcat5.5.9 it is display Unsupported version 49.0 error .Do you have any idea?

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You're trying to run Java code compiled with 1.5 SDK on an earlier VM (e.g. 1.4).

Version 49 => Java 1.5 and 48 => Java 1.4

By default compiling code with a 1.5 Java compiler will generate bytecode that only runs on a 1.5 VM, but you can set flags to make the bytecode backwards compatible.

Tomcat 5.5.x is (AFAIK) buildt with 1.5 SDK, but with backwards compability enabled. Thus Tomcat can run on an 1.4 VM...

You could either upgrade the VM Tomcat is running on, or compile your code with the "-target 1.4" option, e.g.

javac -target 1.4 MyCode.java

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