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From: "Waldemar Maier (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
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Subject: [jira] [Updated] (LANG-1144) Multiple calls of
 org.apache.commons.lang3.concurrent.LazyInitializer.initialize() are
 possible
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     [ https://issues.apache.org/jira/browse/LANG-1144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Waldemar Maier updated LANG-1144:
---------------------------------
    Summary: Multiple calls of org.apache.commons.lang3.concurrent.LazyInitializer.initialize() are possible  (was: Multiple calls of org.apache.commons.lang3.concurrent.LazyInitializer.initialize())

> Multiple calls of org.apache.commons.lang3.concurrent.LazyInitializer.initialize() are possible
> -----------------------------------------------------------------------------------------------
>
>                 Key: LANG-1144
>                 URL: https://issues.apache.org/jira/browse/LANG-1144
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.concurrent.*
>    Affects Versions: 3.4
>         Environment: Java 1.8 on Windows 7 x64
>            Reporter: Waldemar Maier
>            Priority: Critical
>
> It is possible to create a construct, that allows multiple calls of LazyInitializer.initialize, when calculations (which can be very expensive) return null as result. 
> The Junit Test can be something like this:
> {code:java}
> package edu.test;
> import static org.junit.Assert.assertEquals;
> import org.apache.commons.lang3.concurrent.ConcurrentException;
> import org.apache.commons.lang3.concurrent.LazyInitializer;
> import org.junit.Test;
> public class LazyInitializerTest {
>   private int lazyinitCounter = 0;
>   private LazyInitializer<Object> lazyIinit = new LazyInitializer<Object>() {
>     @Override
>     protected Object initialize() throws ConcurrentException {
>       lazyinitCounter++;
>       return doSomeVeryExpensiveOperations();
>     }
>   };
>   
>   
>   private Object doSomeVeryExpensiveOperations() {
>     // do db calls
>     // do some complex math calculations
>     // the result of them all is null
>     return null;
>   }
>   
>   
>   @Test
>   public void testInitialization() throws Exception {
>     lazyIinit.get();
>     lazyIinit.get();
>     assertEquals("Multiple call of LazyInitializer#initialize", 1, lazyinitCounter);
>   }
> }
> {code}



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