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Probleme avec le Hotswap de Javassist
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created by <a href="https://community.jboss.org/people/heavenkhn">heavenkhn</a> in <i>Javassist Development</i> - <a href="https://community.jboss.org/message/815952#815952">View the full discussion</a>
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<div class="jive-rendered-content"><p>import java.io.*;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import com.sun.jdi.connect.IllegalConnectorArgumentsException;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import javassist.util.HotSwapper;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>public class Test {</p><p>    public static void main(String[] args) {</p><p>        HotSwapper hs = null;</p><p>                    try {</p><p>                              hs = new HotSwapper(8000);</p><p>                    } catch (IOException e) {</p><p>                              // TODO Auto-generated catch block</p><p>                              e.printStackTrace();</p><p>                    } catch (IllegalConnectorArgumentsException e) {</p><p>                              // TODO Auto-generated catch block</p><p>                              e.printStackTrace();</p><p>                    }</p><p>        new HelloWorld().print();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        File newfile = new File("bin<br/>logging<br/>HelloWorld.class");</p><p>        byte[] bytes = new byte[(int)newfile.length()];</p><p>        </p><p>        try {</p><p>                              new FileInputStream(newfile).read(bytes);</p><p>                    } catch (FileNotFoundException e) {</p><p>                              // TODO Auto-generated catch block</p><p>                              e.printStackTrace();</p><p>                    } catch (IOException e) {</p><p>                              // TODO Auto-generated catch block</p><p>                              e.printStackTrace();</p><p>                    }</p><p>        System.out.println("** reload a logging version");</p><p>        HelloWorld hl = new HelloWorld();</p><p>        String name = hl.getClass().getName();</p><p>        System.out.println(name);</p><p>        hs.reload(name , bytes);</p><p>        new HelloWorld().print();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        newfile = new File("HelloWorld.class");</p><p>        bytes = new byte[(int)newfile.length()];</p><p>        try {</p><p>                              new FileInputStream(newfile).read(bytes);</p><p>                    } catch (FileNotFoundException e) {</p><p>                              // TODO Auto-generated catch block</p><p>                              e.printStackTrace();</p><p>                    } catch (IOException e) {</p><p>                              // TODO Auto-generated catch block</p><p>                              e.printStackTrace();</p><p>                    }</p><p>        System.out.println("** reload the original version");</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        hs.reload("HelloWorld", bytes);</p><p>        new HelloWorld().print();</p><p>    }</p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>et voila ce que sa donne dans eclipse: </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Listening for transport dt_socket at address: 8000</p><p>hello world</p><p>** reload a logging version</p><p>HelloWorld</p><p>Exception in thread "HotSwap" java.lang.NoClassDefFoundError: class names do not match</p><p>          at com.sun.tools.jdi.VirtualMachineImpl.redefineClasses(VirtualMachineImpl.java:331)</p><p>          at javassist.util.HotSwapper.hotswap(HotSwapper.java:250)</p><p>          at javassist.util.HotSwapper$1.run(HotSwapper.java:224)</p><p>Exception in thread "main" java.lang.RuntimeException: failed to reload: HelloWorld</p><p>          at javassist.util.HotSwapper.reload2(HotSwapper.java:204)</p><p>          at javassist.util.HotSwapper.reload(HotSwapper.java:160)</p><p>          at Test.main(Test.java:38)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Sachant que Hello world a le code suivant : </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p> public class HelloWorld {</p><p>    public void print() {</p><p>        System.out.println("hello world");</p><p>        this.x=2;</p><p>    }</p><p>    </p><p>    public int x;</p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Pourquoi ces exceptions sont-ils apparus ???</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Merci.</p></div>
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