Mysql Error Description
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it will." "If there is any way to do it wrong, he will." When software goes wrong, the MOST IMPORTANT thing to do is to FIND the ERROR MESSAGE, which can give you clues of what went wrong. If things were running fine until the lightning strikes, ask yourself what have you CHANGED! Search this document with your Error Message; or simple google your error message. Stack Trace Most of the times, the error message consists of tens of lines of so-called stack trace of method invocation. That is, method A called method B, which called method C, and so on, until method Z encountered an error and threw an Exception or an Error. It is important to: Get to the first line of the error message to read the description, and Look for the line number of YOUR PROGEAM that triggered the error. For example, this error message (stack trace) has 40 over lines: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure <== First line with error description The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:525) at com.mysql.jdbc.Util.handleNewInstance(Util.java:411) at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116) at com.mysql.jdbc.MysqlIO.