Unchecked conversion found

Hi this issue involves two classes.
in my first class I declare sonarData by doing the following:
private ArrayList<SonarData> sonarDataArray = new ArrayList<SonarData>();
further down in my code I call on a method from another class:
sonarDataArray = fp.parseFiles();
fp.parseFiles() returns an array list which i declared the same way as the first one:
private ArrayList<SonarData> sonarDataArray = new ArrayList<SonarData>();
The issue happens with fp.parseFiles(). It recognizes this as just an ArrayList not an ArrayList<SonarData>
Hope this makes sense, thanks for any help

It ArrayList is declared as:
private ArrayList<SonarData> sonarDataArray = new ArrayList<SonarData>();
And the method returns sonarDataArray so it should be ArrayList<SonarData> however when I compile it says found ArrayList looking for ArrayList<SonarData>

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Warning: [unchecked] unchecked conversion.. how to avoid this warning?

Hi all,
When i compile my java file, i get this warning.
Z:\webapps\I2SG_P2\WEB-INF\classes\com\i2sg>javac testwincDB.java
Note: testwincDB.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Z:\webapps\I2SG_P2\WEB-INF\classes\com\i2sg>javac -Xlint testwincDB.java
testwincDB.java:15: warning: [unchecked] unchecked conversion
found   : java.util.ArrayList
required: java.util.ArrayList<java.lang.String[]>
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public ArrayList getReconReport2(int projID)
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        int i=0;
        try {
        resultSet = statement.executeQuery(getReconReportQuery2);
              while (resultSet.next())
                     recRep2.add(new String[1]); // 0:RECON_COUNT
            ((String []) recRep2.get(i))[0] = resultSet.getString("RECON_COUNT");
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            ex.printStackTrace(System.out);
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    }and
import java.sql.*;
import java.util.ArrayList;
import java.util.*;
public class testwincDB
    public static void main(String args[])
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     for(int i=0;i<totalRec;i++)
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Lakshma

found : java.util.ArrayList
required: java.util.ArrayList<java.lang.String[]>
ArrayList <String[] > recRep2 = dbh.getReconReport2(projID);This tells all about the warning.....
public ArrayList getReconReport2(int projID)change it to:
public ArrayList<String[]> getReconReport2(int projID)Thanks!
Edit: Very late.... :-)
Edited by: T.B.M on Jan 15, 2009 7:20 PM

Unchecked conversion Warnings!!

1. how do i get rid of these unchecked conversion warning for
List<Element> children = new ArrayList<Element>(element.getChildren( "result" ));
where element.getChildren( "result" ) returns a list of Elements.
warning is :
warning: [unchecked] unchecked conversion
found : java.util.List
required: java.util.Collection<? extends org.jdom.Element>
List<Element> children = new ArrayList<Element>(element.getChildren( "result"
2. warning: [deprecation] setIndent(java.lang.String) in org.jdom.output.XMLOutputter has been deprecated
output.setIndent(" ");

1. The message is correct, your code is not safe
The problem is that getChildren returns List not List<Element>. Do you understand the diference? how can a List of an especified type (Element) be created on a List that accepts everything?
This will solve your problem:
//most obvious way to do it
List<Element> children = new ArrayList<Element>();
for (Iterator i = element.getChildren( "result" ).iterator(); i.hasNext();){
children.add((Element) i.next()); //may throw class cast exception
}Do you get the comment about class cast exception? I sugest reading the Generics Tutorial that comes with the jdk documentation.
2 The method is deprecated, this means it is there but not supported (This is the java way : -) Go to the API for the reason...
I did that for you and the method does not even exist anymore, try updating to version 1.0 .

Help with "unchecked conversion" warning

Hello,
following line
Vector devices = SomeDeviceManager.getDeviceList();
gives a warning (when compiled in java 1.5 with -Xlint):
found raw type: java.util.Vector
missing type parameters for generic class java.util.Vector<E>
When I change code to
Vector<DeviceInfo> devices = SomeDeviceManager.getDeviceList();
warning turns into "unchecked conversion" warning. SomeDeviceManager is from some old .jar library, so it's not possible to change getDeviceList signature.
How can I eliminate this warning?
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@SuppressWarnings("unchecked")
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Error in PO- No conversion found for TO to EA

Dear friends,
i got the following error in PO.
I have checked all the mat. master data... if any conv. factor mismatched.......But still not found result....
No conversion found for TO to EA
Message no. 8I171
Diagnosis
The UOM conversion does not exist
Procedure
The UOM conversion does not exist in the material master for the material and UOM entered
Plz. help....
Thanks in Advance
Navin

hi,
if the material is an excisable material , you would have maintained the excise settings for that material in J1ID Trx.
in that you have manitained as TO.
cHECK THE SETTINGS.
Regards,
velu

Warning: [unchecked] unchecked cast found

I am getting the following warning when I compile my code. Please help.
warning: [unchecked] unchecked cast
found : java.lang.Object
required: java.util.Vector<java.lang.Long>
copy.path = (Vector<Long>) this.path.clone();
1 warning
Here is the code
* To change this template, choose Tools | Templates
* and open the template in the editor.
package cs572project1;
import java.util.*;
* Richard Becraft
* 1/22/2010
* CS 572 Heuristic Problem Solving
* This class represents a node in a search tree of a graph that represents a street map.
public class SearchNode implements Cloneable {
public long depth;
public double costSoFar;
public double estimatedCostToGoal;
public Vector<Long> path;
public SearchNode() {
depth = -1;
costSoFar = -1;
estimatedCostToGoal = -1;
path = new Vector<Long>(20, 20);
public void printSearchNode() {
System.out.println("\n****In printSearchNode");
System.out.println("depth: " + depth + " costSoFar: " + costSoFar + " estimatedCostToGoal: " + estimatedCostToGoal);
for (Enumeration<Long> e = this.path.elements(); e.hasMoreElements();) {
System.out.println(e.nextElement());
System.out.println("****Exiting printSearchNode\n");
@Override
public SearchNode clone() {
SearchNode copy;
try {
//System.out.println("in clone SearchNode");
copy = (SearchNode) super.clone();
copy.path = (Vector<Long>) this.path.clone(); // <<<< the offending line
//copy.path = new Vector<Long>(this.path.capacity());
//this.printSearchNode();
//System.out.println("copy.path.size: " + copy.path.size());
//System.out.println("this.path.size: " + this.path.size());
//System.out.println("copy.path.capacity: " + copy.path.capacity());
//System.out.println("this.path.capacity: " + this.path.capacity());
//Collections.copy(copy.path, this.path);
} catch (CloneNotSupportedException e) {
throw new RuntimeException("This class does not implement Cloneable " + e);
return copy;
}

rickbecraft wrote:
I am getting the following warning when I compile my code. Please help.
warning: [unchecked] unchecked cast
found : java.lang.Object
required: java.util.Vector<java.lang.Long>
copy.path = (Vector<Long>) this.path.clone();The variable path has a type of Vector but clone() returns an Object. It is only a warning, not an error, so you can ignore it - I think you can be confident that clone() will always return a Vector. A slightly more typesafe approach (in my opinion) is to create a new Vector<Long> using the constructor that takes a Collection as an argument, passing in the Vector that you want to clone. Something like
copy.path = new Vector<Long>(this.path);

Error "No conversion found for EA to KG"

Hi,
I am facing an error like "No conversion found for EA to KG" at the time of GR.
Inputs: In Mat Master Base UOM is Gram,Order Unit is KG and Conversion(1Kg=1000G) is maintained in Additional Data.
Purchase Order created with KG as both Order Unit and Order Price Unit.
Even though there is no question of EA in this document,Why the error has cropped up at the time of GR?
Pls explore the possible reason behind this error.
Reward points are sure.
Regds

Hi Pavan,
Thanks for reply,
Pls note my observation made to check UOM at differenet places just fyi
1)Materail Master:
Base Unit- G,
Sales Unit- KG,
Order Unit-KG,
Unit Of Issue- KG and
Wt Unit- KG
2)PIR:
Order Unit - KG
3)PO:
Order Unit-KG ,
Stock Unit- G and in conditions also rate is maintained per KG.
Still am not able to trace out why the system is throwing an error "No conversion found for EA to KG". How does it is related to EA.
Pls give some inputs...
Regds

No conversion found for KG to EA in J1IEX With Ref to

Hello,
We are creating the Subcontracting PO with ABC material is having the UOM is KG and Sending the child components to vendor that materials are in "EA".
We are sending the material with paid duty.... we are creating the outgoing excise invoice.
After that we are going to receive the goods. and receive the goods with no excise entry... with ref to material document we are going to capture excise . here we are getting the error"No conversion found for KG to EA"
I have checked in material master additional tab here we are mainatined the EA and KG as convesrion

hi
go to j1id
in maintain excise rates for ur chap id of ur material check u r unit u have given
remove the unit for the chap id entry
hope it help
regards
kunal

Unchecked conversion warning - What is the proper way to fix this?

I've been trying to figure this out for awhile now, and I have not seen an example that will set me on the right track. Given the following code:
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Type safety: The expression of type Comparator needs unchecked conversion to conform to Comparator <? super String>
So just what is the proper method to make the Comparator conform to generics?
** Btw - if anyone knows of a better way to do that comparator, I'm all ears!

Why don't you want like values to be deemed equal?
What would be wrong with using
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I can't modify the queries. Also, I can't modify the 30 or so different types of data records, all having the common field dscr, so that I can write a better implementation. But, I can write a better comparator.
This is all legacy code that I've been working with, so I have to make sure things work as they did before.

Generics with JAXB and Unchecked Conversions

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Here's my schema:
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     <element name="songList"
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List<String> getSongList();Instead of
List getSongList();I'd like to eliminate the unchecked conversions. If anyone has any suggestions or can reference a tutorial, I'd greatly appreciate some tips.
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Wow, sorry for all the typos btw

Outstanding DB conversions found

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TABL/BI0/TFISCPER3 0CNVB 20090206J1RIVERA
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the message ended with
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Hi Luis
What I remeber from my BW upgrade 2 yesrs back
I guess this perticular step will be done by BW functional
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Unchecked conversion

Hi all,
I have a Swing application that uses few generic classes. Currently I'm trying to remove all warnings in my code (adding serialVersionUID is very annoying by the way). I want to express one of my problem with a basic sample.
Consider that I define a generic class A:
public class A<T> {
     public List<String> getList() {
          return new ArrayList<String>();
}And another class B that uses A:
public class B {
     public void doSomethingUnsecure(A a) {
          List<String> list = a.getList();
          for(String item : list) {
               System.out.println(item);
     public void doSomethingSecure(A a) {
          for(Object o : a.getList()) {
               String item = (String)o;
               System.out.println(item);
}I have a few question regarding this piece of code:
1) Why 'List<String> list = a.getList();' in 'doSomethingUnsecure' gives a warning ? It's not the case if A is not generic.
The warning is "Type safety: The expression of type List needs unchecked conversion to conform to List<String>"
2) Why I get no warning at all for 'doSomethingSecure' ?
3) Is there a better way to go around this problem than casting each element in the list (like in doSomethingSecure) ?

>
public class A<T> {
     public List<String> getList() {
          return new ArrayList<String>();
public class B {
     public void doSomethingUnsecure(A a) {
          List<String> list = a.getList();
          for(String item : list) {
               System.out.println(item);
     public void doSomethingSecure(A a) {
          for(Object o : a.getList()) {
               String item = (String)o;
               System.out.println(item);
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A generic type is forever generic. Using the "raw" type is permissible, and sometimes even necessary, but it always gets a warning.
You want to tell it A<SomeClass>, and you want to try and make sure that your <SomeClass> is correct. If you can't, then you might be able to get away with using A<?>, as suggested, if you are treating the A<> item as read-only.
2) Why I get no warning at all for 'doSomethingSecure' ?Because anything can fit into a variable of type Object, so iterating with "Object o" is okay. No cast is needed in this case.
3) Is there a better way to go around this problem than casting each element in the list (like in doSomethingSecure) ?Get the type parameters right, as mentioned above.
=Austin

Working around unchecked conversions when using reflection

I think I've convinced myself that there's no way around this issue when using reflection and Generics, but here's the issue:
Suppose I've got a method that uses reflection to compare an arbitrary property in
an arbitrary pair of beans (of the same class).
public static <T> int compare(T bean0, T bean1, String prop) throws Exception {
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Ok it looks like you're dealing with a classloader issue. when you call that method, it is the equivelant of calling
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Help in: uses unchecked or unsafe operations. warnings problem

need help in my assignment in these warnings problem, i tried it in different ways, one method lists from 0 to end where other should remove or add elements what is listed already,
public ArrayList collectModulos(int a){ // no warning in this method
        int [] tmp=new int[10];
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found : java.util.List
required: java.util.Collection<? extends java.lang.Integer>
arl=new ArrayList<Integer>
(collectModulos(a).subList(1,collectModulos(a)
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^
1 warning

The warning must be because collectModulos(a).subList(1,collectModulos(a).size()) returns something that is not an ArrayList<Integer> - maybe just a plain ArrayList. If you're sure it's correct anyway, then you can ignore it.
However, that method contains much more code than it needs to: You're initializing arl where you declare it, but then on the next line you're immediately initializing it again, discarding the first ArrayList you created. Better would be this:
     public ArrayList removeZero(int a){
        ArrayList<Integer> arl;
        arl=new ArrayList<Integer>(collectModulos(a).subList(1,collectModulos(a).size()));
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     public ArrayList removeZero(int a){
        return new ArrayList<Integer>(collectModulos(a).subList(1,collectModulos(a).size()));
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Unchecked Exception using 1.5 Concurrent Libraries

Sorry to post this here, but it IS related to generics. I'm either doing something wrong, or the concurrent libraries are missing some methods in the ThreadPoolExecutor class.
I'll try and be brief. When I compile my multi-threaded application with lint on, I get the following error:
"TransactionsByStore.java:309: warning: [unchecked] unchecked conversion
found : java.util.concurrent.LinkedBlockingQueue
required: java.util.concurrent.BlockingQueue<java.lang.Runnable>
threadPool = new ThreadPoolExecutor(threadCount, threadCount, threadTimeout, TimeUnit.SECONDS, threadQueue);"
The problem is my "threadQueue" class. It is of type LinkedBlockingQueue<java.util.concurrent.Callable> since Callable allows the class to return something from the "call" method. It appears that most classes in the concurrent libraries prefers Callable classes over Runnable, but the constructor for a ThreadPoolExecutor appears to only accept a thread queue that holds Runnables. That doesn't seem correct.
Does anyone know if there is something that I am doing wrong here, or is this just a current limitation of the ThreadPoolExecutor class?
Thanks.

The problem is my "threadQueue" class. It is of type
LinkedBlockingQueue<java.util.concurrent.Callable>
since Callable allows the class to return something
from the "call" method. It appears that most classes
in the concurrent libraries prefers Callable classes
over Runnable, but the constructor for a
ThreadPoolExecutor appears to only accept a thread
queue that holds Runnables. That doesn't seem
correct.
Does anyone know if there is something that I am
doing wrong here, or is this just a current
limitation of the ThreadPoolExecutor class?OK, so I just did some reading and I now better understand the context of your question:
* ThreadPoolExecutor is an ExecutorService, not just an Executor, so it handles Callables in addition to Runnables
* You're taking the slightly unusual step of constructing your own instance, presumably because you've determined none of the predefined ExecutorServices that the Executors factory class creates are suitable for your task?
* As you wish to use the ThreadPoolExecutor to execute Callables, you want to know why the constructor takes BlockingQueue<Runnable> rather than BlockingQueue<Callable>
So firstly, this question really has nothing to do with generics. Callable isn't a Runnable and as such there's no way you're ever going to be able to pass a BlockingQueue<Callable> into this method. Therefore it's a question about the design of the concurrency libraries. As such you'll probably get much better quality answers in a forum dedicated to that subject.
Having said that:
From what I see the ExecutorService.submit() methods that support Callables are all implemented in the AbstractExecutorService class that is the superclass for ThreadPoolExecutor.
So I read the source code for that class. Turns out every Callable passed to submit() is wrapped in a FutureTask, which is a class that imlements Future<V> and Runnable. This makes perfect sense if you think about it - given that this ExecutorService executes things asynchronously, clearly a Future<V> is required if you want to be able to actually get at the result.
Thus since Callables are wrapped in a class that's Runnable inside the ExecutorService, that's how it is able to handle Callables using a BlockingQueue<Runnable>.
So... is it important to you that the queue you pass in is a BlockingQueue<Callable> or can you simply make it a BlockingQueue<Runnable>?
You're never going to be able to constrain the type of the BlockingQueue to be anything stricter than Runnable, BTW. This is because the ThreadPoolExecutor executes Runnables as well as Callables, so if you were allowed to pass in a BlockingQueue<FutureResult> (for example) then it wouldn't work because the execute(Runnable) method wouldn't be able to add the Runnable to the queue without wrapping it in a spurious FutureResult.

Unchecked conversion found

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