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resources.report.rules.pmd.NonThreadSafeSingleton.html Maven / Gradle / Ivy

NonThreadSafeSingleton
Non-thread safe singletons can result in bad state changes. Eliminate
static singletons if possible by instantiating the object directly. Static
singletons are usually not needed as only a single instance exists anyway.
Other possible fixes are to synchronize the entire method or to use an
initialize-on-demand holder class (do not use the double-check idiom).

See Effective Java, item 48.
        

		
		
		    
		    
    		    
    		    
    		    

    		    
This rule is defined by the following Java class:
    		    net.sourceforge.pmd.rules.design.NonThreadSafeSingleton
    		    
		    
	    
	    
        
        
        
Example:
            
    
                
private static Foo foo = null;

//multiple simultaneous callers may see partially initialized objects
public static Foo getFoo() {
    if (foo==null)
        foo = new Foo();
    return foo;
}
        
            
  
        

        
        
            
                
This rule has the following properties:
                
Name
Default value
Description
                
                
                    

                    
checkNonStaticMethods
                    

                    
Do not set this to false and checkNonStaticFields to true
                    
                
                    

                    
checkNonStaticFields
                    

                    
Do not set this to true and checkNonStaticMethods to false