I think it was caused by gvSIG after reading the following ciation. And I have 
successfully run geoserver in tomcat before I installed gvSIG and the tomcat is 
clearly works well. 
-------------------------------------------------- Citation 
--------------------------------------------
This happens because there are two conflicting JAI modules around, and  with 
different versions. GeoServer uses and depends on JAI 1.1.2, whilst  the JAI 
that ends up in the classpath in the above example is most  probably 1.1 or 
older. 
This can happen for one of two reasons: 

an external application (may be gvSig, Jump or some other  application using 
JAI) have installed in the main Java runtime the JAI  jars in 
<yourJdk>/jre/lib/ext. In this position the jars override  the classpath of 
whatever application is running on the virtual machine.   
JAI下载地址: 
https://jai.dev.java.net/binary-builds.html
the web container has old JAI jars in the shared libraries, that are usually 
put in the classpath before the application ones. 
 
In the first case, you can solve the problem by grabbing the JAI  installers 
from the [jai main site], lastest stable version, and run it  to overwrite the 
old JAI version. 
In the second case, download the pure java version of JAI from the  same site 
and overwrite the jars in the shared libraries, or  alternatively find a way to 
make your web container load the application  jars before the shared lib ones 
(how to do this, if possible at all, is  web container dependent, consult your 
container documentation). 
 
 
---------------------------------------Ciation---------------------------------------------

However, I installed JAI by running jai-1_1_3-lib-windows-i586-jdk.exe and 
jai_imageio-1_1-lib-windows-i586-jdk.exe according to the ciation, but it did 
not solve the problem.
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