Find Duplicate Records MySQL Query

Hi All I know that this is not related Liferay but i came across this useful thing during my development where you can find duplicate record from table and can delete if you need. SELECT tablename.name FROM tablenameINNER JOIN (SELECT name FROM tablenameGROUP BY name HAVING count(name) > 1) dup_record ON tablename.name = dup_record.name...

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Read Files From Folder

Hi All, You can use below code to read files from specific folders : import java.io.File; public class Test {     /**      * @param args      */   public static void listFilesForFolder(File folder) {                 for (File fileEntry : folder.listFiles()) {             if (fileEntry.isDirectory()) {                ...

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Malicious code vulnerability - Java Programming

Malicious code vulnerability - Field is a mutable array Malicious code vulnerability - Field is a mutable Hashtable Malicious code vulnerability - Field isn't final and can't be protected from malicious code Malicious code vulnerability - Field isn't final but should be Malicious code vulnerability - Field should be both final and package protected ...

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Performance - Java Programming

Performance - Could be refactored into a named static inner class Performance - Could be refactored into a static inner class Performance - Explicit garbage collection; extremely dubious except in benchmarking code Performance - Huge string constants is duplicated across multiple class files Performance - Inefficient use of keySet iterator instead of entrySet iterator Performance - Maps and sets of URLs can be performance hogs Performance - Method allocates a boxed primitive just to call toString ...

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Avoid - Java Programming

Avoid Array Loops Avoid Assert As Identifier Avoid Calling Finalize Avoid Catching NPE Avoid Catching Throwable Avoid Decimal Literals In Big Decimal Constructor Avoid Duplicate Literals Avoid Enum As Identifier Avoid Instanceof Checks In Catch Clause Avoid Print Stack Trace Avoid Rethrowing Exception Avoid Throwing Null Pointer Exception Avoid Throwing Raw Exception Types ...

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Bad practice - Java Programming

Bad practice - Abstract class defines covariant compareTo() method Bad practice - Abstract class defines covariant equals() method Bad practice - Certain swing methods needs to be invoked in Swing thread Bad practice - Check for sign of bitwise operation Bad practice - Class defines clone() but doesn't implement Cloneable Bad practice - Class defines compareTo(...) and uses Object.equals() Bad practice - Class defines equals() and uses Object.hashCode() ...

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