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Figure 10 3. General tab of the Service Details dialog box 7. Click the Error Information tab. As shown in Figure 10 4, this tab displays the text of the exception that the suspended service instance encountered, which is the same as what is written to the application event log. The error text usually includes key stack information, indicating at what level the fault occurred and how it was bubbled up through BizTalk. In our example, the instance was suspended because the send port was stopped.

Analogous to the additional surrogate identifier property an <idbag> offers, a surrogate key column would come in handy now. As a side effect, an <idset> would also allow duplicates a clear conflict with the notion of a set. For this and other reasons (including the fact that nobody ever asked for this feature), Hibernate doesn t offer an <idset> or any surrogate identifier collection other than an <idbag>. Hence, you need to change the Java property to a Collection with bag semantics:

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Since it is clear from the context that a WebRequest::Create returns a handle to an HttpRequest instance when an HTTP-based URL is passed, one could silently omit the checking for the nullptr If the cast unexpectedly returns a nullptr because the assumption that was made is not true, the first attempt to access the object via the nullptr results in a NullReferenceException In such a situation, it is impossible to conclude from the exception whether the dynamic_cast returned a nullptr because its input was an unexpected nullptr or because its input was of an unexpected type The safe_cast allows a clear differentiation of these two cases The following code shows how a safe_cast can be used: WebRequest^ req = WebRequest::Create("http://wwwheege.

We ve already mentioned that we think natural primary keys can be a bad idea. Natural keys often make it difficult to refactor the data model when business requirements change. They may even, in extreme cases, impact performance. Unfortunately, many legacy schemas use (natural) composite keys heavily and, for the reason we discourage the use of composite keys, it may be difficult to change the legacy schema to use noncomposite natural or surrogate keys. Therefore, Hibernate supports the use of natural keys. If the natural key is a composite key, support is via the <composite-id> mapping. Let s map both a composite and a noncomposite natural primary key. Mapping a natural key If you encountered a USERS table in a legacy schema, it s likely that USERNAME is the actual primary key. In this case, you have no surrogate identifier that is automatically generated. Instead, you enable the assigned identifier generator strategy to indicate to Hibernate that the identifier is a natural key assigned by the application before the object is saved:

you simply need to enter this into the URL field in the Add Web Reference dialog, as shown in Figure 2-14.

net"); HttpWebRequest^ httpReq = safe_cast<HttpWebRequest^>(req); // use HttpRequest specific members here httpReq->AllowAutoRedirect = true; When the casted variable refers to an object of the wrong type, a System::InvalidCastException^ is thrown When the input of the cast operator is unexpectedly a nullptr, the result of the cast is also a nullptr, and the attempt to use the casted value will cause a System::NullReferenceException Even the good old C-style cast can be used for downcasting For casts to tracking handle types, the C-style cast is either mapped to a safe_cast or to a safe_cast and a const_cast The safe_cast and the dynamic_cast are similar in that they both perform a runtime check against the input object Such a runtime check is helpful to ensure that wrong assumptions have a clear outcome, but they also imply a performance cost.

If you are absolutely sure that the cast will succeed, you can use a static_cast instead of a safe_cast The static_cast omits the runtime check and is therefore faster..

As usual, you can do more harm than good if you don t measure the impact on performance carefully on a suitable range of your target systems. Most applications will not need to touch this value.

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