query: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toString()' on a null object reference (HELP)
positive_passages.docid: 49
positive_passages.text: What is a NullPointerException, and how do I fix it?
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negative_passages.text: Is null reference possible?
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negative_passages.text: Why does String.valueOf(null) throw a NullPointerException?
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negative_passages.text: What is a NumberFormatException and how can I fix it?
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negative_passages.text: What will happen when I call a member function on a NULL object pointer?
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negative_passages.text: Compiler warning: null reference exception
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negative_passages.text: Static fields on a null reference in Java
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negative_passages.text: java.lang.NullPointerException at org.apache.jsp.foo_jsp._jspInit(foo_jsp.java:22)
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negative_passages.text: Strange Java null behavior in Method Overloading