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Alfresco upgrade from 3.2.0 to 4.2.c

Question asked by anndrewtr on Aug 22, 2013
Latest reply on Nov 13, 2013 by anndrewtr

Is it possible to upgrade Alfresco community edition from 3.2.0 to 4.2.c. If not anyone help me the intermediate steps need to be followed.

Because during upgrade after Database restoration to 4.2.c while I am starting the Alfresco service I am getting the below exception.

2013-08-22 05:41:13,327  INFO  [domain.schema.SchemaBootstrap] [localhost-startStop-1] Schema managed by database dialect org.hibernate.dialect.MySQLInnoDBDialect.
2013-08-22 05:41:14,075  ERROR [domain.schema.SchemaBootstrap] [localhost-startStop-1] Unable to validate database schema.
java.lang.RuntimeException: Unable to execute export.

Caused by: java.lang.NullPointerException
   at org.alfresco.util.schemacomp.ExportDb.extractSchema(
   at org.alfresco.util.schemacomp.ExportDb.execute(
   at org.alfresco.util.schemacomp.ExportDb.execute(
   … 32 more

2013-08-22 05:41:51,357  ERROR [domain.schema.SchemaBootstrap] [localhost-startStop-1] Schema auto-update failed
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'alf_prop_class' already exists
   at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
   at sun.reflect.NativeConstructorAccessorImpl.newInstance(
   at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(

Attached the full stace exception hereby.