com.microsoft.sqlserver.jdbc.SQLServerException.class throws java.lang.SecurityException

I'm trying to connect to a sql server 2005 express edition but have some trouble with it: i can connect to sql server through eclipse IDE but when I create a jar and try connecting to server, I get the following error.

Exception in thread "main" java.lang.SecurityException: invalid SHA1 signature f
ile digest for com/microsoft/sqlserver/jdbc/SQLServerException.class
at sun.security.util.SignatureFileVerifier.verifySection(Unknown Source)

at sun.security.util.SignatureFileVerifier.processImpl(Unknown Source)
at sun.security.util.SignatureFileVerifier.process(Unknown Source)
at java.util.jar.JarVerifier.processEntry(Unknown Source)
at java.util.jar.JarVerifier.update(Unknown Source)
at java.util.jar.JarFile.initializeVerifier(Unknown Source)
at java.util.jar.JarFile.getInputStream(Unknown Source)
at sun.misc.URLClassPath$JarLoader$2.getInputStream(Unknown Source)
at sun.misc.Resource.cachedInputStream(Unknown Source)
at sun.misc.Resource.getByteBuffer(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)


I'm using :
- os : winxp
- jdk1.5.0_06
- drivers : sqljdbc_1.1.1501.101 / sqljdbc_1.2.2828.100

is there anything i've missed? please, help me..