On 31/10/2013 15:36, sebb wrote:
> On 31 October 2013 15:26, Mark Thomas <[email protected]> wrote:
>> On 31/10/2013 15:13, [email protected] wrote:
>>> Author: sebb
>>> Date: Thu Oct 31 15:13:47 2013
>>> New Revision: 1537525
>>>
>>> URL: http://svn.apache.org/r1537525
>>> Log:
>>> Document that CCE is handled OK; there is no "unchecked" warning happening
>>> here
>>
>> Why did you make this change? It undoes a recent commit that fixed a
>> handful of type safety warnings.
>
> I don't see any warnings when building with Java 7 or Eclipse.
I suspect you have "Ignore unavoidable generic type problems" enabled.
The issue with this is that it is an Eclipse specific feature. Users of
$OTHER_IDE can't enabled it and therefore can't work with a clean (i.e.
warning free) code base.
I do use Eclipse and could enable that option but having gone through a
enable it, remove the warnings, have $OTHER_IDE users complain, disable
it, add the warnings back cycle with Tomcat, I'd rather not repeat the
exercise here.
@SuppressWarnings("unchecked") // Unavoidable
is probably the way to go here.
Mark
>
> AFAICT these are now just class casts that can fail with CCE.
>
> If necessary it can be reverted.
> In which case need to document why the annotatiions are needed and why
> they are OK to use (i.e. in this case the CCE is expected and
> handled).
>
>> Mark
>>
>>
>>> Modified:
>>>
>>> commons/proper/dbcp/trunk/src/java/org/apache/commons/dbcp2/BasicDataSource.java
>>>
>>> Modified:
>>> commons/proper/dbcp/trunk/src/java/org/apache/commons/dbcp2/BasicDataSource.java
>>> URL:
>>> http://svn.apache.org/viewvc/commons/proper/dbcp/trunk/src/java/org/apache/commons/dbcp2/BasicDataSource.java?rev=1537525&r1=1537524&r2=1537525&view=diff
>>> ==============================================================================
>>> ---
>>> commons/proper/dbcp/trunk/src/java/org/apache/commons/dbcp2/BasicDataSource.java
>>> (original)
>>> +++
>>> commons/proper/dbcp/trunk/src/java/org/apache/commons/dbcp2/BasicDataSource.java
>>> Thu Oct 31 15:13:47 2013
>>> @@ -1743,23 +1743,18 @@ public class BasicDataSource implements
>>> try {
>>> try {
>>> if (driverClassLoader == null) {
>>> - @SuppressWarnings("unchecked")
>>> - Class<Driver> c =
>>> - (Class<Driver>)
>>> Class.forName(driverClassName);
>>> - driverFromCCL = c;
>>> + driverFromCCL = (Class<Driver>)
>>> Class.forName(driverClassName);
>>> } else {
>>> - @SuppressWarnings("unchecked")
>>> - Class<Driver> c = (Class<Driver>)
>>> Class.forName(
>>> + driverFromCCL = (Class<Driver>) Class.forName(
>>> driverClassName, true,
>>> driverClassLoader);
>>> - driverFromCCL = c;
>>> }
>>> } catch (ClassNotFoundException cnfe) {
>>> - @SuppressWarnings("unchecked")
>>> - Class<Driver> c = (Class<Driver>)
>>> Thread.currentThread(
>>> + driverFromCCL = (Class<Driver>)
>>> Thread.currentThread(
>>> ).getContextClassLoader().loadClass(
>>> driverClassName);
>>> - driverFromCCL = c;
>>> }
>>> + // N.B. the casts above may cause ClassCastException
>>> if classname is not correct
>>> + // This is caught below
>>> } catch (Exception t) {
>>> String message = "Cannot load JDBC driver class '" +
>>> driverClassName + "'";
>>>
>>>
>>
>>
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