I have this error since yesterday " javax.servlet.ServletException: Error number 3 in 0: Could not initialize main XWiki context Wrapped Exception: Error number 3001 in 3: Cannot load class com.xpn.xwiki.store.migration.hibernate.XWikiHibernateMigrationManager from param xwiki.store.migration.manager.class Wrapped Exception: Error number 0 in 3: Exception while hibernate execute Wrapped Exception: invalid configuration org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:535) org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:433) org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236) org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) javax.servlet.http.HttpServlet.service(HttpServlet.java:689) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:152) com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:119) com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:68) com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:295) com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:112) " i don't change the hibernate configuration since last try. hibernate.configuration <?xml version='1.0' encoding='utf-8'?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <!-- Please refer to the installation guide on http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Installation for configuring your database. You'll need to do 2 things: 1) Copy your database driver JAR in WEB-INF/lib or in some shared lib directory 2) Uncomment the properties below for your specific DB (and comment the default database configuration if it doesn't match your DB) --> <!-- Generic parameters common to all Databases --> <property name="show_sql">false</property> <property name="use_outer_join">true</property> <property name="dbcp.defaultAutoCommit">false</property> <property name="dbcp.maxActive">50</property> <property name="dbcp.maxIdle">5</property> <property name="dbcp.maxWait">30000</property> <property name="dbcp.whenExhaustedAction">1</property> <property name="dbcp.ps.whenExhaustedAction">1</property> <property name="dbcp.ps.maxActive">20</property> <property name="dbcp.ps.maxWait">120000</property> <property name="dbcp.ps.maxIdle">20</property> <!-- Without it, some queries fail in MS SQL. XWiki doesn't need scrollable result sets, anyway. --> <property name="jdbc.use_scrollable_resultset">false</property> <!-- Configuration for the default database. Comment out this section and uncomment other sections below if you want to use another database. Note that the database tables will be created automatically if they don't already exist. --> <property name="connection.url">jdbc:hsqldb:file:database/xwiki_db;shutdown=true</property> <property name="connection.username">sa</property> <property name="connection.password"></property> <property name="connection.driver_class">org.hsqldb.jdbcDriver</property> <property name="dialect">org.hibernate.dialect.HSQLDialect</property> <property name="connection.provider_class">com.xpn.xwiki.store.DBCPConnectionProvider</property> <property name="connection.pool_size">2</property> <property name="statement_cache.size">2</property> <mapping resource="xwiki.hbm.xml"/> <mapping resource="feeds.hbm.xml"/> <mapping resource="activitystream.hbm.xml"/> <!-- MySQL configuration. Uncomment if you want to use MySQL and comment out other database configurations. We need to set the sql_mode to a less strict value, see XWIKI-1945 <property name="connection.url">jdbc:mysql://localhost/xwiki?useServerPrepStmts=false&amp;useUnicode=true&amp;characterEncoding=UTF-8&amp;sessionVariables=sql_mode=''</property> <property name="connection.username">xwiki</property> <property name="connection.password">xwiki</property> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <property name="connection.provider_class">com.xpn.xwiki.store.DBCPConnectionProvider</property> <property name="connection.pool_size">2</property> <property name="statement_cache.size">2</property> <mapping resource="xwiki.hbm.xml"/> <mapping resource="feeds.hbm.xml"/> <mapping resource="activitystream.hbm.xml"/> --> <!-- HSQLDB configuration. Uncomment if you want to use HSQLDB and comment out other database configurations. <property name="connection.url">jdbc:hsqldb:file:/some/path/xwikidb;shutdown=true</property> <property name="connection.username">sa</property> <property name="connection.password"></property> <property name="connection.driver_class">org.hsqldb.jdbcDriver</property> <property name="dialect">org.hibernate.dialect.HSQLDialect</property> <property name="connection.provider_class">com.xpn.xwiki.store.DBCPConnectionProvider</property> <property name="connection.pool_size">2</property> <property name="statement_cache.size">2</property> <mapping resource="xwiki.hbm.xml"/> <mapping resource="feeds.hbm.xml"/> <mapping resource="activitystream.hbm.xml"/> --> <!-- PostgreSQL configuration. Uncomment if you want to use PostgreSQL and comment out other database configurations. <property name="connection.url">jdbc:postgresql:xwiki</property> <property name="connection.username">xwiki</property> <property name="connection.password">xwiki</property> <property name="connection.driver_class">org.postgresql.Driver</property> <property name="dialect">org.hibernate.dialect.PostgreSQLDialect</property> <property name="connection.provider_class">com.xpn.xwiki.store.DBCPConnectionProvider</property> <property name="connection.pool_size">2</property> <property name="statement_cache.size">2</property> <mapping resource="xwiki.hbm.xml"/> <mapping resource="feeds.hbm.xml"/> <mapping resource="activitystream.hbm.xml"/> --> <!-- Oracle configuration. Uncomment if you want to use Oracle and comment out other database configurations. Note: the 2 properties named "hibernate.connection.SetBigStringTryClob" and "hibernate.jdbc.batch_size". They are required to tell Oracle to allow CLOBs larger than 32K.--> <property name="connection.url">jdbc:oracle:thin:@localhost:1521:XE</property> <property name="connection.username">xwiki</property> <property name="connection.password">xwiki</property> <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property> <property name="dialect">org.hibernate.dialect.Oracle10gDialect</property> <property name="connection.provider_class">com.xpn.xwiki.store.DBCPConnectionProvider</property> <property name="connection.pool_size">2</property> <property name="statement_cache.size">2</property> <property name="hibernate.connection.SetBigStringTryClob">true</property> <property name="hibernate.jdbc.batch_size">0</property> <mapping resource="xwiki.oracle.hbm.xml"/> <mapping resource="feeds.oracle.hbm.xml"/> <mapping resource="activitystream.hbm.xml"/> <!-- Derby configuration. Uncomment if you want to use Derby and comment out other database configurations. <property name="connection.url">jdbc:derby:/some/path/xwikidb;create=true</property> <property name="connection.driver_class">org.apache.derby.jdbc.EmbeddedDriver</property> <property name="dialect">org.hibernate.dialect.DerbyDialect</property> <property name="connection.provider_class">com.xpn.xwiki.store.DBCPConnectionProvider</property> <property name="connection.pool_size">2</property> <property name="statement_cache.size">2</property> <mapping resource="xwiki.derby.hbm.xml"/> <mapping resource="feeds.hbm.xml"/> <mapping resource="activitystream.hbm.xml"/> --> </session-factory> </hibernate-configuration> I don't see where the error is!