java.lang.NoSuchFieldError: fStringPool

[ohmygod]

In JBoss 7.1.1.Final, my code uses org.apache.xerces.readers.DefaultEntityHandler class which is included in jar xerces1.4.4.jar, but when I added this jar in my ear\lib directory, another error reported:

java.lang.NoSuchFieldError: fStringPool

but I checked and found the class StringPool.class does exit at xerces1.4.4\org\apache\xerces\utils.

So I am confused what the problem is. Could anybody help me?

[jaikiran]

Please post the entire exception stacktrace and also the output of:

jar -tf yourear.ear

[ohmygod]

Hi Jaikiran,

Here is the entir message for the problem:

17:47:01,569 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/demo].[ControlServlet]] (http-127.0.0.1-127.0.0.1-8080-2) Servlet.service() for servlet ControlServlet threw exception: java.lang.NoSuchFieldError: fStringPool
 at com.demo.extractor.xml.MyDOMParser.<init>(MyDOMParser.java:41) [demo.jar:]
 at com.demo.XmlFileHandler.extract(XmlFileHandler.java:112) [demo.jar:]
 at com.demo.servlet.ControlServlet.doPost(ControlServlet.java:709) [classes:]
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:754) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.13.Final.jar:]
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
 at com.demo.util.HibernateFilter.doFilter(HibernateFilter.java:68) [demo.jar:]
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:]
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
 at com.demo.util.EncodingFilter.doFilter(EncodingFilter.java:44) [demo.jar:]
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:]
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.13.Final.jar:]
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.13.Final.jar:]
 at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153) [jboss-as-web-7.1.1.Final.jar:7.1.1.Final]
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) [jbossweb-7.0.13.Final.jar:]
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.13.Final.jar:]
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.13.Final.jar:]
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) [jbossweb-7.0.13.Final.jar:]
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.13.Final.jar:]
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) [jbossweb-7.0.13.Final.jar:]
 at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) [jbossweb-7.0.13.Final.jar:]
 at java.lang.Thread.run(Thread.java:619) [rt.jar:1.6.0_07]

My ear is not a jar file but a folder structure which includes following folders/file:

-demo-web.war (folder)

-lib (folder, jars put here)

-META-INF (folder, jboss-deployment-structure.xml put here)

-demo.jar (the jar file which includes all my project's classes including the MDB classes)

And here is the content of jboss-deployment-structure.xml by the way.

<jboss-deployment-structure>
<ear-subdeployments-isolated>true</ear-subdeployments-isolated>
  <deployment>
      <dependencies>
       <module name="com.sun.xml.bind" export="true"/>
       <module name="javax.wsdl4j.api" export="true"/>
       <module name="org.apache.commons.pool" export="true"/>
          <module name="org.apache.xalan" export="true"/>
    <module name="org.apache.xerces" export="true"/>
    <module name="org.dom4j" export="true"/>
    <module name="org.hibernate" export="true"/>
    <module name="org.hibernate.envers" export="true"/>
    <module name="org.javassist" export="true"/>
    <module name="org.jboss.as.web" export="true"/>
    <module name="org.jdom" export="true"/>
        </dependencies>
  </deployment>
</jboss-deployment-structure>

Since there are too many class files in demo.jar, do you think you need to see all of them by the jar output? If yes, I will attach them in a txt file for you. Thanks for your effort.

[ohmygod]

What I am confused is why the error reported is not ClassNotFound error but just the field not found error.

[sfcoy]

xerces 1.4.4 is positively archaic (c2003) and it's use in any post Java 5 implementation is likely to cause problems.

Xerces was one of the bases for the standardisation of XML parsing that was delivered in Java 5. You should consider migrating the code that depends upon it to the APIs present in Java 6/7 today.

[raydecampo]

It looks to me like you are including xerces 1.4.4 in your EAR but also asking JBoss to use the xerces packaged with it (2.9.1) in your jboss-deployment-structure.xml.  So the wrong version of the class is being used which explains why it is a field not found error and not a class not found error.