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The Thread class requires that the main thread loop be implemented in a method named run(). For our purposes, this is where the connection will be established and the listener loop will be implemented. To start a thread in Java using the Thread class, the start() method is called. In our case, the SocketListener thread is started by the MsgListener application. This is already in place as we can see by revisiting the code listing for MsgListener.java. Since the SocketListener will be running on its own thread, we need a way to shut down the thread when we are finished. A public shutdown() method is provided to perform this step from the MsgListener application. However, the best we will be able to do at this point is set a boolean flag indicating that the SocketListener should shut itself down at the earliest point possible. This is because the SocketListener class will be occupied by its task of listening for incoming messages. The best opportunity for checking the shutdown state is when the listener times out. We then have the opportunity to check the shutdown state and either exit the thread or restart the listener connection. In some implementations of the J2ME virtual machines, there is only one underlying native thread that is actually being used on the device. This is the thread the virtual machine is running on. In these situations multithreading behavior is handled internally by the virtual machine using what are called green threads. Green threads are explained in more detail in chapter 14. In these situations all threads will be terminated automatically when the application exits without the need for invoking any thread shutdown operations. However, it is always a good idea to have thread shut386

With this code snippet, you can extract the first revision, the one that only has the signature field named first . We ve now checked for the validity of a signature using Adobe Reader, but you can also automate the process.

12.4.4 Verifying the signatures in a document The root certificates of CAs that are trusted by the distributor of the Java Runtime you use are stored in a file named cacerts. You can find this key store in the lib directory of the JAVA_HOME directory. Depending on the use case, different collections of CA certificates may be required, which may not include those already in that file.

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down functionality in place, since each J2ME virtual machine has different characteristics and may implement threading differently. Failing to properly terminate threads could result in memory leaks or worse. In our example, failing to shut down a listener would lock the port that the listener is bound to, requiring the device to be restarted in order to release the port resource.

If a root certificate isn t present, you can import it with the keytool utility. This key store can be loaded into a KeyStore object like this:

The KVM provided with the MIDP reference implementation implements multithreading entirely within the virtual machine (green threads). As a result, all listener threads are terminated when the application exits. Therefore, there is no way to actually illustrate the threads terminating on their own since they are shut down automatically.

KeyStore ks = PdfPKCS7.loadCacertsKeyStore();

As Figure 2-23 illustrates, you will notice that tables you create with this method span the entire width of the document, no matter how many columns they contain. For more control over your columns, use the Insert Table dialog box. It allows you to specify a number of different formatting options for your table. To access the Insert Table dialog box, place the cursor where you would like to position the table. Then click Table Insert Table. In the Insert Table dialog box, specify the number of columns and rows you would like the table to contain, as shown in Figure 2-24. You can also set options for the column width. By default, Word automatically sets the width of the columns. However, you can use the Fixed column width box to specify the width of the columns in inches. Or, you can have Word automatically fit the table to the window or table contents by selecting one of the AutoFit options.

The next bit of code uses the getSignatureNames() method to get all the names of the signature fields in the document. Then you can use the root certificates in a KeyStore to verify each signature.

Unlike a socket client, the socket listener must listen to a designated port for any clients wishing to establish communications. This is implemented using a StreamConnectionNotifier.

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