2009-07-31 14:24:45,054 [Robot-20090731141956043-2] WARN org.seasar.robot.transformer.impl.HtmlTransformer - Malformed URL: JavaScript:history.go(-1); java.net.MalformedURLException: unknown protocol: javascript
        at java.net.URL.<init>(URL.java:574)
        at java.net.URL.<init>(URL.java:464)
        at org.seasar.robot.transformer.impl.HtmlTransformer.getUrlFromTagAttribute(HtmlTransformer.java:340)
        at org.seasar.robot.transformer.impl.HtmlTransformer.storeChildUrls(HtmlTransformer.java:217)
        at org.seasar.robot.transformer.impl.HtmlTransformer.transform(HtmlTransformer.java:155)
        at org.seasar.robot.processor.impl.DefaultResponseProcessor.process(DefaultResponseProcessor.java:53)
        at org.seasar.robot.S2RobotThread.processResponse(S2RobotThread.java:252)
        at org.seasar.robot.S2RobotThread.run(S2RobotThread.java:166)
        at java.lang.Thread.run(Thread.java:619)