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Object response = null; Throwable exception = null; try { rsp = invocation.invokeNext(); response = rsp.getResponse(); } catch (Throwable e){ exception = e; } MethodInvocation methodInvocation = (MethodInvocation)invocation; Method method = methodInvocation.method; String className = method.getDeclaringClass().getName(); String methodName = method.getName(); Object[] parameters = methodInvocation.arguments; out.print(version); out.print(','); out.print(className); out.print(','); out.print(methodName); out.print(','); if (response!=null) { out.print(getValue(response)); } else if (method.getReturnType().isAssignableFrom(java.lang.Void.TYPE)) { out.print("void"); } else { out.print("null"); } out.print(','); StringBuffer temp = new StringBuffer(); for (int i = 0; i < parameters.length; i++) { if (parameters[i]!=null) { temp.append(getValue(parameters[i])); } else { temp.append("null"); } temp.append(';'); } if (temp.length()>0) { temp.deleteCharAt(temp.length()-1); out.print(temp); } if (exception!=null){ out.print(','); out.print("throws "); out.print(exception.getClass().getName());

In chapter 12 you learned that the Entity Access Object design pattern improves code maintainability by decoupling the persistence logic from the business logic. Spring provides EAO (Spring still calls it DAO) for JPA and many O/R mapping frameworks such as Hibernate and TopLink. Spring provides two ways to access and manipulate entities in building Spring EAOs: using the JPA API directly or using JpaTemplate. In chapter 12 we used EAOs to call the EntityManager API directly. We ll now demonstrate how to change the implementation classes to use JPA from Spring applications with the Spring JpaTemplate. Listing 16.1 shows the ActionBazaar EAO implementation classes you need when using JPA from Spring applications. Note that the Spring classnames

continue to use the DAO naming convention instead of the revised EAO naming that we re featuring in this book.

To add finder methods to a CMP entity bean, you need to use EJ-BQL. For this recipe, we are going to add some customer finder methods to the EquityBean CMP

package actionbazaar.persistence.eao; import org.springframework.orm.jpa.support.JpaDaoSupport; public abstract class BasicSpringEAO extends JpaDaoSupport { }

} out.println(); out.flush(); return rsp; } private String getValue(Object o) { if (!o.getClass().isArray()) { return Integer.toString(o.hashCode()); } else { StringBuffer value = new StringBuffer(); Object[] temp = (Object[]) o; for (int i=0;i<temp.length;i++) { value.append(getValue(temp[i])); value.append('|'); } return value.toString(); } } ... } The major difficulty of the implementation shown in Listing 9-15 involves dealing with object values that are not easily represented as simple strings (for instance, arrays and userdefined class instances). For the sake of the example, we have defined the getValue method, which uses the java.lang.Object.hashCode method to get a unique representation of an object and that also deals with arrays. Note that the call to invocation.invokeNext() is performed within a try/catch block in order to record potential exceptions. The recorder is tested on the program shown in Listing 9-16, which corresponds to the earlier version of the application. Listing 9-16. A Simple Example to Test for Regressions: Version 1 package aop.tests.regression; import java.util.Vector; public class RegressionExample { public int increment(int value) { return ++value; } public int decrement(int value) { return --value; }

public class BidSpringEAO extends BasicSpringEAO implements BidEAO { public Bid addBid(Item item, String bidderId, double bidPrice) { Bid bid = new Bid(); ... getJpaTemplate().persist(bid); Uses JpaTemplate to persist return bid; }

entity bean that we have used in other recipes in this chapter. The home interface is shown in listing 3.24.

public Bid cancelBid(Long bidId) { Bid bid = (Bid)getJpaTemplate().find(Bid.class, bidId); bid.setBidStatus(BidStatus.CANCELLED); getJpaTemplate().merge(bid); Uses JpaTemplate to merge return bid; }

The class that implements the EAO interface must extend JpaDaoSupport b. Instead of using the EntityManager API, you use JpaTemplate. In listing 16.1, we ve used the persist and merge methods c and d to persist or merge entity instances. Using JpaTemplate How are exceptions handled with regard to JpaTemplate We re glad you asked. You need to be aware that JpaTemplate does not throw any persistence API exceptions. Instead, it throws Spring s DataAccessException. The primary benefit of this to developers is that by translating exceptions into those provided by the Spring framework, the persistence mechanism is neutral. This means you can swap out persistence mechanisms and your application code won t have to change to support the new framework s error handling. This makes it easier to migrate from one persistence toolkit to another, or to support multiple toolkits if you are a tool vendor. Table 16.2 describes some of the important methods in JpaTemplate.