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Example 5.1. Example POJO public class AuditAspect { private String logDir; private BufferedWriter out; public AuditAspect() { logDir = System.getProperty("user.dir") + "/log"; File directory = new File(logDir); if (!directory.exists()) { directory.mkdir(); } } public Object audit(ConstructorInvocation inv) throws Throwable { SimpleDateFormat formatter = new SimpleDateFormat("ddMMyyyy-kkmmss"); Calendar now = Calendar.getInstance(); String filename = "auditLog-" + formatter.format(now.getTime()); File auditLog = new File(logDir + "/" + filename); auditLog.createNewFile(); out = new BufferedWriter(new FileWriter(auditLog)); return inv.invokeNext(); } public Object audit(MethodInvocation inv) throws Throwable { String name = inv.getMethod().getName(); Object[] args = inv.getArguments(); Object retVal = inv.invokeNext(); StringBuffer buffer = new StringBuffer(); for (int i=0; i < args.length; i++) { if (i > 0) { buffer.append(", "); } buffer.append(args[i].toString()); } if (out != null) { out.write("Method: " + name); if (buffer.length() > 0) { out.write(" Args: " + buffer.toString()); } if (retVal != null) { out.write(" Return: " + retVal.toString()); } out.write(" "); out.flush(); } return retVal; } }