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try { res.setContentType("text/html"); PrintWriter writer = res.getWriter(); writer.println("<html><body>"); String num = req.getParameter("number"); Integer i = new Integer(num); writer.println("You entered the number " + i.intValue()); writer.println("</body></html>"); writer.close(); } catch (Exception e) { log("", e); }



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def sift_up(heap, startpos, pos): newitem = heap[pos] while pos > startpos: parentpos = (pos - 1) >> 1 parent = heap[parentpos] if parent <= newitem: break heap[pos] = parent pos = parentpos heap[pos] = newitem # # # # # # # # The item we're sifting up Don't go beyond the root The same as (pos - 1) // 2 Who's your daddy Valid parent found Otherwise: copy parent down Next candidate position Place the item in its spot





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Looks OK, right No, there is still a problem. What happens when the Integer constructor throws an exception No output is sent back to the client, because the exception causes the thread of execution to immediately jump to the catch block. The client gets to stare at a blank screen. Unless the exception is an IOException thrown while writing the response, you should always attempt to return some kind of response to the client. That could mean putting try...catch blocks around the code that you anticipate could throw exceptions, or adding output statements that would be called from the catch block to send a response back to the client.

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To define a method as transactional, you can simply annotate it with @Transactional. Note that you should only annotate public methods due to the proxy-based limitations of Spring AOP. package com.apress.springrecipes.bookshop; ... import org.springframework.transaction.annotation.Transactional; public class JdbcBookShop extends JdbcDaoSupport implements BookShop { @Transactional public void purchase(String isbn, String username) { ... } } You may apply the @Transactional annotation at the method level or the class level. When applying this annotation to a class, all of the public methods within this class will be defined as transactional. Although you can apply @Transactional to interfaces or method declarations in an interface, it s not recommended, as it may not work properly with class-based proxies (i.e., CGLIB proxies). In the bean configuration file, you only have to enable the <tx:annotation-driven> element and specify a transaction manager for it. That s all you need to make it work. Spring will advise methods with @Transactional, or methods in a class with @Transactional, from beans declared in the IoC container. As a result, Spring can manage transactions for these methods. <beans ...> <tx:annotation-driven transaction-manager="transactionManager" /> ... <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

One other way to make your application more robust is to define error pages for your application. For example, given the BadServlet above, we might create a web page or JSP that tells the user that they must enter digits only. Then we can specify that the application serve this page whenever a NumberFormatException occurs. This is done with the <error-page> element of the deployment descriptor:

Note that the original function was called _siftdown, because it s sifting the value down in the list I prefer to think of it as sifting it up in the implicit tree structure of the heap, though Note also that, just like bisect_right, the implementation uses a loop rather than recursion In addition to heappop, there is heapreplace, which will pop the smallest item and insert a new element at the same time (a bit more efficient than a heappop followed by a heappush) The heappop operation returns the root (the first element) To maintain the shape of the heap, the last item is moved to the root position, and from there it is swapped downward (in each step, with its smallest child) until it is smaller than both its children.

<property name="dataSource" ref="dataSource" /> </bean> <bean id="bookShop" class="com.apress.springrecipes.bookshop.JdbcBookShop"> <property name="dataSource" ref="dataSource" /> </bean> </beans> In fact, you can omit the transaction-manager attribute in the <tx:annotation-driven> element if your transaction manager has the name transactionManager. This element will automatically detect a transaction manager with this name. You only have to specify a transaction manager when it has a different name. <beans ...> <tx:annotation-driven /> ... </beans>

<web-app> <! This is the deployment descriptor for the BadServlet example > <servlet> <servlet-name>BadServlet</servlet-name> <servlet-class>web.BadServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>BadServlet</servlet-name> <url-pattern>/BadServlet</url-pattern> </servlet-mapping> <error-page> <exception-type>java.lang.NumberFormatException</exception-type> <location>/BadNumber.html</location> </error-page> </web-app>

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