non portable JDK dependant clasess (sun.**)

We should not be using sun.** classes in tests or in code. they are naughty and break working on non Sun JDKs.

[andy@localhost jboss-4.0.x]$ find . -name "*.java" -exec grep -i "sun.misc.BASE64Encoder" '{}' ';'
sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();

[andy@localhost jboss-4.0.x]$ find . -name "*.java" -exec grep -Hi "sun.misc.BASE64Encoder" '{}' ';'
./security/src/main/org/jboss/test/UtilTestCase.java: sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();
[andy@localhost jboss-4.0.x]$ find . -name "*.java" -exec grep -Hi "sun.misc" '{}' ';'
./security/src/main/org/jboss/test/UtilTestCase.java: /** Compare Util.encodeBase64 against the sun misc class
./security/src/main/org/jboss/test/UtilTestCase.java: sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();
./jaxrpc/src/main/org/jboss/axis/utils/Base64.java: * Eliminates dependency on sun.misc.Base64Encoding,
./jaxrpc/src/main/org/jboss/axis/utils/Base64.java: * (it's an access exception to load sun.misc.* classes
[andy@localhost jboss-4.0.x]$ find . -name "*.java" -exec grep -Hi "sun.io" '{}' ';'
./messaging/src/main/org/jboss/mq/xml/XElement.java: sun.io.CharToByteUTF8 conv = new sun.io.CharToByteUTF8();
./messaging/src/main/org/jboss/mq/xml/XElement.java: } catch ( sun.io.MalformedInputException e ) {
[andy@localhost jboss-4.0.x]$

Moreover the