private static ExpressionFactory tryExpressionFactoryImplementation(String packagePrefix) {
String className = packagePrefix + ".el.ExpressionFactoryImpl";
try {
Class cl = ClassUtil.forName(className);
if (ExpressionFactory.class.isAssignableFrom(cl)) {
logger.info(
"Using " + className + " as implementation of " + ExpressionFactory.class.getName());
return (ExpressionFactory) cl.newInstance();
}
logger.warn(
"Class " + className + " does not implement " + ExpressionFactory.class.getName());
} catch (ClassNotFoundException e) {
} catch (Exception e) {
logger.error("Failed to instantiate " + className, e);
}
return null;
}
