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AOP over Tomcat base classes
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created by <a href="http://community.jboss.org/people/judac">Juliano Daloia de Carvalho</a> in <i>Javassist</i> - <a href="http://community.jboss.org/message/566922#566922">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi all.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>     I'm using JavaAssist in one Agent I'm creating to change the behavior of tomcat, but I do not want to customize this on tomcat itself. I want to add some security issues, and for that I want to intercepted the exactly moment when tomcat class receives the client request, and intercepted the last moment that a tomcat class handle the response.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    I'm trying to inject a code over two methods on the tomcat base class:</p><blockquote class="jive-quote">org/apache/catalina/connector/CoyoteAdapter</blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>In first instance I just want to put an output message to check when this method is requested.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java"><font color="navy"><b>try</b></font> <font color="navy">{</font>
     method.insertBefore(
            <font color="red">" { "</font> +
            <font color="red">"     System.out.println( \" -[AOP][CoyoteAdapter][parseSessionId] \" );  "</font> +
            <font color="red">" } "</font>);   
     <font color="navy">}</font>
<font color="navy"><b>catch</b></font> (CannotCompileException e)<font color="navy">{</font>
     System.out.println(<font color="red">"["</font>+className+<font color="red">"]["</font>+method.getName()+<font color="red">"]-> "</font> + e.getMessage());
     e.printStackTrace();
<font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The problem is that the</p><pre class="jive-pre"><code class="jive-code jive-java">CannotCompileException
</code></pre><p>throws with the information about one attribute which the method I want to change receives as parameter.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java"><font color="navy"><b>protected</b></font> <font color="navy"><b>void</b></font> parseSessionId(org.apache.coyote.Request req, Request request) <font color="navy">{</font>
     ...
<font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The class not found is</p><pre class="jive-pre"><code class="jive-code jive-java">org.apache.coyote.Request req
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Bellow follows the stack trace collected.</p><blockquote class="jive-quote"><p>Prepering to transform org.apache.catalina.connector.CoyoteAdapter<br/>[org/apache/catalina/connector/CoyoteAdapter][parseSessionId]----------------> cannot find org.apache.coyote.Request<br/>javassist.CannotCompileException: cannot find org.apache.coyote.Request<br/>        at javassist.CtBehavior.insertBefore(CtBehavior.java:574)<br/>        at br.com.cedro.tomcat.transformer.Transformer.transform(Transformer.java:84)<br/>        at sun.instrument.TransformerManager.transform(TransformerManager.java:169)<br/>        at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:365)<br/>        at java.lang.ClassLoader.defineClass1(Native Method)<br/>        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)<br/>        at java.lang.ClassLoader.defineClass(ClassLoader.java:616)<br/>        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)<br/>        at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)<br/>        at java.net.URLClassLoader.access$000(URLClassLoader.java:58)<br/>        at java.net.URLClassLoader$1.run(URLClassLoader.java:197)<br/>        at java.security.AccessController.doPrivileged(Native Method)<br/>        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)<br/>        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)<br/>        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)<br/>        at org.apache.catalina.connector.Connector.initialize(Connector.java:1007)<br/>        at org.apache.catalina.core.StandardService.initialize(StandardService.java:680)<br/>        at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:795)<br/>        at org.apache.catalina.startup.Catalina.load(Catalina.java:524)<br/>        at org.apache.catalina.startup.Catalina.load(Catalina.java:548)<br/>        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<br/>        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)<br/>        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<br/>        at java.lang.reflect.Method.invoke(Method.java:597)<br/>        at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:261)<br/>        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)<br/>Caused by: javassist.NotFoundException: org.apache.coyote.Request<br/>        at javassist.ClassPool.get(ClassPool.java:417)<br/>        at javassist.bytecode.Descriptor.toCtClass(Descriptor.java:549)<br/>        at javassist.bytecode.Descriptor.getParameterTypes(Descriptor.java:396)<br/>        at javassist.CtBehavior.getParameterTypes(CtBehavior.java:235)<br/>        at javassist.CtBehavior.insertBefore(CtBehavior.java:555)<br/>        ... 25 more</p></blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I appreciate the help. I'm exploring tomcat source for 5 days, and I didn't found the exactly point where I need to customize.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Tks</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Juliano.</p></div>
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