Giving error when compiling with ant but not showing the error in eclips

[ravin kacha]

Hi All,

I am getting across a very strange error. I have written a java file, it is getting compiled in Eclips without any error. Now I am compiling the whole package through an ANT script which is showing the below error for the code snippet while compiling

public String QueryString(Map requestMap)
{
    HashMap <String, ?>map = new HashMap<String, Object>();
//some code here
    map.putAll((Map)requestMap.get("requestMap"));
//some code here
}

\com\holset\matrix\utils\QueryString.java - Classed method have been conflicted between two classes.

Error Prompted :-
com\holset\matrix\utils\QueryString.java:102: reference to putAll is ambiguous, both method putAll(java.util.Map<? extends K,? extends V>) in .AbstractMap<java.lang.String,capture#832 of ?> and method putAll(java.util.Map<? extends K,? extends V>) in java.util.HashMap<java.lang.String,capture#832 of ?> match
map.putAll((Map) requestMap.get("requestMap"));

can any buddy help me out to resolve this. Because this is a show stopper for me cause I am not able to create a jar because of this only.

Thanks in advance

Ravin Kacha

[Martijn Verburg]

Hi Ravin,

Chances are that your ANT build and your Eclipse are using different versions of the JDK. Can you check that?

[ravin kacha]

I have checked the JDK versions, both are identical.

But the question which invokes my thought process again and again is, though I am giving HashMap<K,V> as data type and creating object of the same type how can compiler get confused in AbstractMap and HashMap???

[Martijn Verburg]

Hmm, what version of the JDK is this?

[ravin kacha]

JDK 1.6.0_03

is there any concern with the JDK version and ANT as such??

[Vivekkk Singh]

Hey ,

A generic type declaration is compiled once and for all, and turned into a single class file, just like an ordinary class or interface declaration.

Google about Genrics..It will solve the problem.

[Ernest Friedman-Hill]

Eclipse has it's own Java compiler -- it doesn't compile using the JDK compiler.

I don't know offhand whether this is a bug in javac, or a bug in the Eclipse compiler. Here is a link to a similar-sounding bug in Sun's Java bug database which is still open for JDK 1.6, although it's apparently fixed in 1.7 and 1.5 .

[Ernest Friedman-Hill]

Vivekkkkk Singhhhhh wrote:
Google about Genrics..It will solve the problem.

Oh, indeed. Googling "generics" will make this compiler bug go away.

[Martijn Verburg]

Vivekkkkk Singhhhhh,

Can you please change your screen name in accordance with our Naming Policy, thanks

[Martijn Verburg]

Ernest Friedman-Hill wrote:Eclipse has it's own Java compiler -- it doesn't compile using the JDK compiler.

I don't know offhand whether this is a bug in javac, or a bug in the Eclipse compiler. Here is a link to a similar-sounding bug in Sun's Java bug database which is still open for JDK 1.6, although it's apparently fixed in 1.7 and 1.5 .

In addition to this, Ravin, can you try with the latest version of 1.6? (its 1.6.0_12)

[Vivekkk Singh]

Well I changed the Name But I think the Javaranch should change it as the I am Not able to create account with my name.So I dont think its fair enof to change my second name...lols.. ...I dont Know what kind of validation they make from First Name.

[Martijn Verburg]

Vivek Singh at Javaranch wrote:Well I changed the Name But I think the Javaranch should change it as the I am Not able to create account with my name.So I dont think its fair enof to change my second name...lols.. ...I dont Know what kind of validation they make from First Name.

PM sent.

[Vivekkk Singh]

Hey here you are trying to mix a non Generic collection and generic collection..

reuestMap and map.This could be the problem because while compilation there is No error.But it may give a runtime...

[Vivekkk Singh]

i can give you a small example on that.

 List aList=new ArrayList();
aList.add("Javaranch");
aList.add(new Integer(5))   

So both are valid but

 List<String> aList=new ArrayList<String>();
aList.add("Javaranch")   

Only this is valid.

Similarly in your case requestMap is too general.Where as your map is very specific.
So you are trying to put a general map to something specific.

I hope it works now