Package net.sourceforge.pmd.lang.java.rule.multithreading

Class DoubleCheckedLockingRule

  • All Implemented Interfaces:
    AstVisitor<Object,​Object>, JavaParserVisitor, JavaVisitor<Object,​Object>, PropertySource, Rule
    public class DoubleCheckedLockingRule
extends AbstractJavaRule
     void method() {
   if (x == null) {
     synchronized(this){
       if (x == null) {
         x = new | method();
       }
     }
   }
 }

    The error is when one uses the value assigned within a synchronized section, outside of a synchronized section.

     if (x == null) // is outside of synchronized section
   x = new | method();

    Very very specific check for double checked locking.

    Author:
    CL Gilbert (dnoyeb@users.sourceforge.net)