ws-security-dom/src/main/java/org/apache/wss4j/dom/handler/WSHandler.java [1066:1088]:
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        String callbackHandlerClass
    ) throws WSSecurityException {

        Class<? extends CallbackHandler> cbClass = null;
        CallbackHandler cbHandler = null;
        try {
            cbClass =
                Loader.loadClass(getClassLoader(),
                                 callbackHandlerClass,
                                 CallbackHandler.class);
        } catch (ClassNotFoundException e) {
            throw new WSSecurityException(WSSecurityException.ErrorCode.FAILURE, e,
                    "empty",
                    new Object[] {"WSHandler: cannot load callback handler class: "
                    + callbackHandlerClass}
            );
        }
        try {
            cbHandler = cbClass.getDeclaredConstructor().newInstance();
        } catch (Exception e) {
            throw new WSSecurityException(WSSecurityException.ErrorCode.FAILURE, e,
                    "empty",
                    new Object[] {"WSHandler: cannot create instance of callback handler: "
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ws-security-stax/src/main/java/org/apache/wss4j/stax/setup/ConfigurationConverter.java [353:375]:
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        String callbackHandlerClass
    ) throws WSSecurityException {

        Class<? extends CallbackHandler> cbClass = null;
        CallbackHandler cbHandler = null;
        try {
            cbClass =
                Loader.loadClass(getClassLoader(),
                                 callbackHandlerClass,
                                 CallbackHandler.class);
        } catch (ClassNotFoundException e) {
            throw new WSSecurityException(WSSecurityException.ErrorCode.FAILURE, e,
                    "empty",
                    new Object[] {"WSHandler: cannot load callback handler class: "
                    + callbackHandlerClass}
            );
        }
        try {
            cbHandler = cbClass.getDeclaredConstructor().newInstance();
        } catch (Exception e) {
            throw new WSSecurityException(WSSecurityException.ErrorCode.FAILURE, e,
                    "empty",
                    new Object[] {"WSHandler: cannot create instance of callback handler: "
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