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Posted to dev@activemq.apache.org by "Martin Lepage (JIRA)" <ji...@apache.org> on 2011/05/26 15:31:47 UTC
[jira] [Updated] (AMQCPP-373) AMQ_CATCH_RETHROW upcasts the
re-thrown exception
[ https://issues.apache.org/jira/browse/AMQCPP-373?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Martin Lepage updated AMQCPP-373:
---------------------------------
Patch Info: (was: [Patch Available])
> AMQ_CATCH_RETHROW upcasts the re-thrown exception
> -------------------------------------------------
>
> Key: AMQCPP-373
> URL: https://issues.apache.org/jira/browse/AMQCPP-373
> Project: ActiveMQ C++ Client
> Issue Type: Bug
> Components: CMS Impl, Decaf
> Affects Versions: 3.5.0
> Environment: Windows 7 (visual C++ 2005), Linux (gcc 4.1.2)
> Reporter: Martin Lepage
> Assignee: Timothy Bish
> Priority: Minor
> Labels: exception, exception_handling
> Attachments: exception.patch
>
> Original Estimate: 0.25h
> Remaining Estimate: 0.25h
>
> AMQ_CATCH_RETHROW and DECAF_CATCH_RETHROW as defined in {{activemq/exceptions/ExceptionDefines.h}} and {{decaf/lang/exceptions/ExceptionDefines.h}} upcast the exceptions when they rethrow it, which results in loss of information (but not of data) along the way.
> Take for example the following c++ code fragment, which mimics the way AMQ_CATCH_RETHROW is used throughout the code :
> {code:title=Exception handling|borderStyle=solid}
> #include <iostream>
> #include <typeinfo>
> #include <activemq/exceptions/ExceptionDefines.h>
> #include <activemq/exceptions/BrokerException.h>
> int main()
> {
> try
> {
> try
> {
> try
> {
> throw activemq::exceptions::BrokerException(
> __FILE__, __LINE__, "Testing");
> }
> AMQ_CATCH_RETHROW(activemq::exceptions::BrokerException)
> }
> AMQ_CATCH_RETHROW(activemq::exceptions::ActiveMQException)
> }
> catch (decaf::lang::Throwable &e)
> {
> std::cout.flags(std::ios_base::boolalpha);
> std::cout << "Broker exception : " << (typeid(e).name() ==
> typeid(activemq::exceptions::BrokerException).name()) << "\n";
> std::cout << "ActiveMQException : " << (typeid(e).name() ==
> typeid(activemq::exceptions::ActiveMQException).name()) << "\n";
>
> decaf::lang::Throwable *convertedException =
> dynamic_cast<activemq::exceptions::BrokerException *>(&e);
> std::cout << "Conversion failed : " << (convertedException == NULL)
> << "\n";
> }
> return 0;
> }
> {code}
> which returns :
> {code:xml}
> Broker exception : false
> ActiveMQException : true
> Conversion failed : true
> {code}
> The solution is to replace '{{throw e;}}' by '{{throw;}}' in the definitions of AMQ_CATCH_RETHROW and DECAF_CATCH_RETHROW.
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