Hello everyone, I am having problem with loader constraint violation. I am using jboss-5.0.1.GA with JDK 1.6. The server starts normally with welcome page of my application but when I start to login through that page, there occurs problem which is given below: | exception | javax.servlet.ServletException: Servlet.init() for servlet controller threw exception | org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190) | org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525) | org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92) | | root cause | | java.lang.LinkageError: loader constraint violation: when resolving method "javax.xml.parsers.DocumentBuilder.parse(Lorg/xml/sax/InputSource;)Lorg/w3c/dom/Document;" the class loader (instance of org/jboss/classloader/spi/base/BaseClassLoader) of the current class, np/com/remitron/admin/utility/Config, and the class loader (instance of <bootloader>) for resolved class, javax/xml/parsers/DocumentBuilder, have different Class objects for the type org/xml/sax/InputSource used in the signature | np.com.remitron.admin.utility.Config.init(Config.java:33) | | Can anyone suggest me, what this exception means? and also how to solve this problem? The code in config.java file is given below: | protected void init(ServletContext sctx,String xmlFile) throws Exception | { | InputStream is=null; | try { | is=sctx.getResourceAsStream(xmlFile); | DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance(); | DocumentBuilder builder=factory.newDocumentBuilder(); | Document doc=builder.parse(new InputSource(is)); | root=doc.getDocumentElement(); | | } | | finally{ | if(is!=null) | { | is.close(); | } | } | } | | Thank you. -Ritesh View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4232648#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...