"How to make the log file to show exact line number the exception thrown instead of Unknown source?"
The exact line number the exception thrown (It is what I want)
Caused by: java.lang.NullPointerException
at com.vaadin.ui.collection.Testing.isValidFormSubmit(Testing.java:315)....
It informs you there is an exception, please guess where the exception is. (Kill me)
Caused by: java.lang.NullPointerException
at com.vaadin.ui.collection.Testing.isValidFormSubmit(Unknown Source)....
It is only add debug="true" in your javac tag of your build.xml file if you are using ant script to compile your project.
