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A transaction s rollback rule can be defined in the @Transactional annotation via the rollbackFor and noRollbackFor attributes. These two attributes are declared as Class[], so you can specify more than one exception for each attribute. package com.apress.springenterpriserecipes.bookshop.spring; ... import org.springframework.transaction.annotation.Propagation; import org.springframework.transaction.annotation.Transactional; import java.io.IOException; public class JdbcBookShop extends JdbcDaoSupport implements BookShop { ... @Transactional( propagation = Propagation.REQUIRES_NEW, rollbackFor = IOException.class, noRollbackFor = ArithmeticException.class) public void purchase(String isbn, String username) throws Exception{ throw new ArithmeticException(); //throw new IOException(); } } In a Spring transaction advice, the rollback rule can be specified in the <tx:method> element. You can separate the exceptions with commas if there s more than one exception.

<bean id="sequenceGenerator1" class="com.apress.springrecipes.sequence.SequenceGenerator"> <property name="initial" value="100000" /> <property name="suffix" value="A" /> <property name="prefixGenerator" ref="datePrefixGenerator" /> </bean> <bean id="datePrefixGenerator" class="com.apress.springrecipes.sequence.DatePrefixGenerator"> <property name="pattern" value="yyyyMMdd" /> </bean> </beans> To avoid duplicating the same properties, you can declare a base sequence generator bean with those properties set. Then the two sequence generators can inherit this base generator so that they also have those properties set automatically. You needn t specify the class attributes of the child beans if they are the same as the parent s. <beans ...> <bean id="baseSequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator"> <property name="initial" value="100000" /> <property name="suffix" value="A" /> <property name="prefixGenerator" ref="datePrefixGenerator" /> </bean> <bean id="sequenceGenerator" parent="baseSequenceGenerator" /> <bean id="sequenceGenerator1" parent="baseSequenceGenerator" /> ... </beans> The inherited properties can be overridden by the child beans. For example, you can add a child sequence generator with a different initial value. <beans ...> <bean id="baseSequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator"> <property name="initial" value="100000" /> <property name="suffix" value="A" /> <property name="prefixGenerator" ref="datePrefixGenerator" /> </bean> <bean id="sequenceGenerator2" parent="baseSequenceGenerator"> <property name="initial" value="200000" /> </bean> ... </beans>

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binderregisterCustomEditor(Dateclass, new CustomDateEditor( dateFormat, true)); } protected void doSubmitAction(Object command) throws Exception { Reservation reservation = (Reservation) command; reservationServicemake(reservation); } } To bind form field values to a command object, a form controller may have to perform type conversions for the field values, as they are all submitted as strings The type conversions are actually performed by property editors registered in this controller Spring has preregistered several property editors to convert well-known data types such as numbers and Booleans You have to register your custom editors for other data types such as javautil Date Custom property editors are registered to the ServletRequestDataBinder argument in the initBinder() method If there s anything wrong when binding the form field values, SimpleFormController will automatically render the form view again with the errors Otherwise, it will call the onSubmit() method to handle the form submission.

<tx:advice ...> <tx:attributes> <tx:method name="..." rollback-for="java.io.IOException" no-rollback-for="java.lang.ArithmeticException"/> ... </tx:attributes> </tx:advice> In classic Spring AOP, the rollback rule can be specified in the transaction attributes of TransactionInterceptor and TransactionProxyFactoryBean. The minus sign indicates an exception to cause a transaction to roll back, while the plus sign indicates an exception to cause a transaction to commit. <property name="transactionAttributes"> <props> <prop key="..."> PROPAGATION_REQUIRED, -java.io.IOException, +java.lang.ArithmeticException </prop> </props> </property> In Spring s transaction management API, the rollback rule can be specified in a RuleBasedTransactionAttribute object. Because it implements the TransactionDefinition interface, it can be passed to a transaction manager s getTransaction() method or a transaction template s constructor. RuleBasedTransactionAttribute attr = new RuleBasedTransactionAttribute(); attr.getRollbackRules().add( new RollbackRuleAttribute(IOException.class)); attr.getRollbackRules().add( new NoRollbackRuleAttribute(SendFailedException.class));

The last strategy recommended by the PMBOK is that of mitigation, which seeks to reduce the probability and/or consequences of an adverse risk event to an acceptable threshold [PMI 2000]. Given that software projects tend to share the same sets of risks, we can find mitigation responses that are applicable to software development projects in general. We ll discuss the mitigation responses pioneered by the new agile methodologies in 5, but be warned: they usually involve breaking PMBOK rules. The risk management model in the PMBOK is comprehensive and useful, and it seems that there are no specific hidden assumptions that prevent it from being used in software projects. However, software projects exhibit unique characteristics that make it difficult to apply, and it is often applied badly. After all, would such numbers of projects have failed so badly if their risks had been properly managed

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