Problems using Reflection within JBoss 4.0.4 GA (Tomcat Cont

[hauke1980]

Hi,

i'm a little bit confused. Just migrated from JBoss 4.0.3 SP1 to 4.0.4 GA and all my reflection-using Servlets exploded with the following exception...

19:45:53,263 ERROR [STDERR] java.lang.IllegalArgumentException
19:45:53,263 ERROR [STDERR] at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:37)
19:45:53,263 ERROR [STDERR] at sun.reflect.UnsafeIntegerFieldAccessorImpl.set(UnsafeIntegerFieldAccessorImpl.java:57)
19:45:53,263 ERROR [STDERR] at java.lang.reflect.Field.set(Field.java:656)
19:45:53,263 ERROR [STDERR] at de.sung.servlet.ReflectionTest.doGet(ReflectionTest.java:28)
19:45:53,263 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
19:45:53,263 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
19:45:53,323 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
19:45:53,323 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
19:45:53,323 ERROR [STDERR] at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
19:45:53,323 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
19:45:53,323 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
19:45:53,323 ERROR [STDERR] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
19:45:53,323 ERROR [STDERR] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
19:45:53,323 ERROR [STDERR] at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
19:45:53,323 ERROR [STDERR] at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
19:45:53,323 ERROR [STDERR] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
19:45:53,323 ERROR [STDERR] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
19:45:53,323 ERROR [STDERR] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
19:45:53,323 ERROR [STDERR] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
19:45:53,323 ERROR [STDERR] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
19:45:53,323 ERROR [STDERR] at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
19:45:53,323 ERROR [STDERR] at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
19:45:53,323 ERROR [STDERR] at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
19:45:53,323 ERROR [STDERR] at java.lang.Thread.run(Thread.java:595)
19:45:53,323 INFO [STDOUT] value: 0

Normally I deploy my WAR within an EAR but I built a simple WAR for testing those fuzzy reflection exceptions.

the servlet

package de.sung.servlet;

import java.io.IOException;
import java.lang.reflect.Field;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ReflectionTest extends HttpServlet {

 private int valueToSetByReflection;

 @Override
 protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {
 Field fields[] = this.getClass().getDeclaredFields();

 for ( Field field : fields ) {

 if ( field.getName().equals("valueToSetByReflection") ) {

 if ( ! field.isAccessible() ) {
 field.setAccessible( true );
 }

 try {
 field.set("valueToSetByReflection", new Integer(1337) );
 } catch (IllegalArgumentException e) {
 e.getMessage();
 e.printStackTrace();
 } catch (IllegalAccessException e) {
 e.getMessage();
 e.printStackTrace();
 }
 }

 }

 System.out.println("value: " + valueToSetByReflection);
 }

}

the web.xml

<web-app version="1.0">

 <display-name>Reflection Servlet Test</display-name>
 <description>Test for showing Reflection problems</description>

 <servlet>
 <servlet-name>ReflectionTest</servlet-name>
 <servlet-class>de.sung.servlet.ReflectionTest</servlet-class>
 <display-name>Reflection Test</display-name>
 </servlet>

 <servlet-mapping>
 <servlet-name>ReflectionTest</servlet-name>
 <url-pattern>/test</url-pattern>
 </servlet-mapping>

</web-app>

the war-file

reflectiontest.war
 | META-INF
 | |_ MANIFEST.MF
 |
 | WEB-INF
 | |_ web.xml
 | |_ classes
 | |_ de.sung.servlet.ReflectionTest.class

I hope you've some hints about that strange behaviour... Is it maybe a bug in the Tomcat?


Regards,
Hauke