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  1. ,

    Thrown when an application is trying to use or access an object whose reference equals to null but if you are getting no message, try using the option -XX:-OmitStackTraceInFastThrow.

java.lang.NullPointerException: lock == null	at java.io.Reader.(Reader.java:64)	at java.io.InputStreamReader.(InputStreamReader.java:122)	at java.io.InputStreamReader.(InputStreamReader.java:59)	at com.robotium.solo.WebUtils.getJavaScriptAsString(WebUtils.java:354)	at com.robotium.solo.WebUtils.prepareForStartOfJavascriptExecution(WebUtils.java:162)	at com.robotium.solo.WebUtils.executeJavaScriptFunction(WebUtils.java:276)	at com.robotium.solo.WebUtils.executeJavaScript(WebUtils.java:238)	at com.robotium.solo.WebUtils.getWebElements(WebUtils.java:111)	at com.robotium.solo.Searcher.searchForWebElement(Searcher.java:238)	at com.robotium.solo.Waiter.waitForWebElement(Waiter.java:498)	at com.robotium.solo.Solo.waitForWebElement(Solo.java:672)