[JIRA] [core] (JENKINS-21664) Plugins with optional dependencies and compiled with Java6 cause Exception in loading

Sun, 09 Feb 2014 02:14:02 -0800

ikedam commented on Bug JENKINS-21664

I finally found the root cause.
Upcasting in codes cause class loading:

public void doSomething()
{
  if(Jenkins.getInstance().getPlugin("dependee"))
  {
    Derived d = somemethod();
    Base b = (Derive)d; // <- This causes load Derive even not executing doSomething().
  }
}


and in Java6,




for(Base b: getDerivedList())
{
  someMethodForBase(b);
}





This code is compiled as following:




for(Derived b: getDerivedList()) // <- Base is changed to Derived
{
  someMethodForBase(b); // Here causes upcasting.
}





There are some exceptions:


    
	
  • Upcasting to Object does not cause class loading.
    • 
	
  • Conversion between generic types does not cause class loading. (as generic types are completely ignored in execution time)
	
      
		
    • Base b = derivedList.get( i ); does not cause class loading.
      • 
		
    • Base b = derivedIterator.next(); does not cause class loading.
      • 
	
    
	
    •
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