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invoking a method with the help of object instance from a dynamically generated method using javassist
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created by <a href="https://community.jboss.org/people/rpslive">rpslive</a> in <i>Javassist Development</i> - <a href="https://community.jboss.org/message/821808#821808">View the full discussion</a>
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<div class="jive-rendered-content"><p style="margin: 0 0 1em; font-size: 14px; background-color: #ffffff; color: #000000; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;">i want to invoke a method with the help of object instance of the same class from within a method which i m generating dynamically with the help of javassist, i m finding it difficult to implement. A similar method is present with javassist called <a class="jive-link-external-small" href="http://www.csg.ci.i.u-tokyo.ac.jp/~chiba/javassist/html/javassist/CtNewMethod.html#delegator%28javassist.CtMethod,%20javassist.CtClass%29" rel="nofollow">delegator</a></p><p style="margin: 0 0 1em; font-size: 14px; background-color: #ffffff; color: #000000; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;">for reference : with the help of delegator we can call the same method with super</p><pre class="lang-java prettyprint prettyprinted" style="margin: 0 0 10px; padding: 5px; font-size: 14px; background-color: #eeeeee; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; color: #000000;"><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="kwd" style="color: #00008b;">int</span><span class="pln"> f</span><span class="pun">(</span><span class="kwd" style="color: #00008b;">int</span><span class="pln"> p</span><span class="pun">,</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">int</span><span class="pln"> q</span><span class="pun">)</span><span class="pln"> </span></code><span class="pun" style="color: #333333;">{</span><span class="pln" style="color: #333333;"> </span></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="kwd" style="color: #00008b;">        return</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">super</span><span class="pun">.</span><span class="pln">f</span><span class="pun">(</span><span class="pln">p</span><span class="pun">,</span><span class="pln"> q</span><span class="pun">);</span><span class="pln"> </span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pun">        }</span></code></p></pre><p style="margin: 0 0 1em; font-size: 14px; background-color: #ffffff; color: #000000; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;">i wish to generate the method f dynamically and call the base class method f with the help of the object instance of base class which is injected to the dynamically generated class.</p><pre class="lang-java prettyprint prettyprinted" style="margin: 0 0 10px; padding: 5px; font-size: 14px; background-color: #eeeeee; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; color: #000000;"><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="kwd" style="color: #00008b;">int</span><span class="pln"> f</span><span class="pun">(</span><span class="kwd" style="color: #00008b;">int</span><span class="pln"> p</span><span class="pun">,</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">int</span><span class="pln"> q</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pun"></span><span class="pln">         </span><span class="kwd" style="color: #00008b;">return</span><span class="pln"> objectInstance</span><span class="pun">.</span><span class="pln">f</span><span class="pun">(</span><span class="pln">p</span><span class="pun">,</span><span class="pln"> q</span><span class="pun">);</span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln">        </span><span class="pun">}</span></code></p></pre><p style="margin: 0 0 1em; font-size: 14px; background-color: #ffffff; color: #000000; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;">i m getting this objectInstance before generating this class and use it to set the field which is also being added dynamically to this class.</p><p style="margin: 0 0 1em; font-size: 14px; background-color: #ffffff; color: #000000; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;"><strong>assume the scenario below for better understanding:</strong></p><pre class="lang-java prettyprint prettyprinted" style="margin: 0 0 10px; padding: 5px; font-size: 14px; background-color: #eeeeee; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; color: #000000;"><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="kwd" style="color: #00008b;">public</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">class</span><span class="pln"> A</span><span class="pun">(){</span><span class="pln"> </span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln"></span><span class="kwd" style="color: #00008b;">       public</span><span class="pln"> A</span><span class="pun">(</span><span class="typ" style="color: #2b91af;">Object</span><span class="pln"> B</span><span class="pun">,</span><span class="typ" style="color: #2b91af;">Object</span><span class="pln"> C</span><span class="pun">){</span><span class="com" style="color: gray;">//A's constructor}</span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln">       </span><span class="kwd" style="color: #00008b;">public</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">int</span><span class="pln"> f</span><span class="pun">(</span><span class="kwd" style="color: #00008b;">int</span><span class="pln"> p</span><span class="pun">,</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">int</span><span class="pln"> q</span><span class="pun">){</span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln">              </span><span class="kwd" style="color: #00008b;">return</span><span class="pln"> p</span><span class="pun">+</span><span class="pln">q</span><span class="pun">;</span><span class="pln"> </span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pun">              }</span><span class="pln"> </span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pun">       }</span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln">  </span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln">main</span><span class="pun">(){</span><span class="pln"> </span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln">      C c</span><span class="pun">=</span><span class="kwd" style="color: #00008b;">new</span><span class="pln"> C</span><span class="pun">();</span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln">      B b</span><span class="pun">=</span><span class="kwd" style="color: #00008b;">new</span><span class="pln"> B</span><span class="pun">();</span><span class="pln"> </span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln">      A a</span><span class="pun">=</span><span class="kwd" style="color: #00008b;">new</span><span class="pln"> A</span><span class="pun">(</span><span class="pln">b</span><span class="pun">,</span><span class="pln">c</span><span class="pun">);</span><span class="pln"> </span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln">      dynamic</span><span class="pun">(</span><span class="pln">a</span><span class="pun">);</span><span class="pln"> </span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pun">}</span></code></p></pre><p style="margin: 0 0 1em; font-size: 14px; background-color: #ffffff; color: #000000; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;">i want to code dynamic(Object objectInstance) i a way such that the dynamically added class looks like...</p><pre class="lang-java prettyprint prettyprinted" style="margin: 0 0 10px; padding: 5px; font-size: 14px; background-color: #eeeeee; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; color: #000000;"><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="kwd" style="color: #00008b;">public</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">class</span><span class="pln"> newA</span><span class="pun">(){</span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pun"></span><span class="pln">       </span><span class="kwd" style="color: #00008b;">private</span><span class="pln"> </span><span class="typ" style="color: #2b91af;">Object</span><span class="pln"> objectInstance</span><span class="pun">;</span><span class="pln">  </span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="kwd" style="color: #00008b;">       public</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">void</span><span class="pln"> setter</span><span class="pun">(</span><span class="typ" style="color: #2b91af;">Object</span><span class="pln"> obj</span><span class="pun">){</span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln">              </span><span class="kwd" style="color: #00008b;">this</span><span class="pun">.</span><span class="pln">objectInstance</span><span class="pun">=</span><span class="pln">obj</span><span class="pun">;</span><span class="pln"> </span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pun">              }</span><span class="pln"> </span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="kwd" style="color: #00008b;">       public</span><span class="pln"> </span><span class="typ" style="color: #2b91af;">Object</span><span class="pln"> getter</span><span class="pun">(){</span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln">              </span><span class="kwd" style="color: #00008b;">return</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">this</span><span class="pun">.</span><span class="pln">objectInstance</span><span class="pun">;</span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln">              </span><span class="pun">}</span><span class="pln"> </span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="kwd" style="color: #00008b;">       public</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">int</span><span class="pln"> f</span><span class="pun">(</span><span class="kwd" style="color: #00008b;">int</span><span class="pln"> p</span><span class="pun">,</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">int</span><span class="pln"> q</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln">              </span><span class="kwd" style="color: #00008b;">return</span><span class="pln"> objectInstance</span><span class="pun">.</span><span class="pln">f</span><span class="pun">(</span><span class="pln">p</span><span class="pun">,</span><span class="pln"> q</span><span class="pun">);</span><span class="pln"> </span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pun">              }</span></code></p><p><code style="font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln"> </span><span class="pun">}</span></code></p></pre></div>
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