I met with a strange problem when connecting to the cloudscape database:

org.jboss.deployment.DeploymentException: Error while fixing table name; - nested throwable: (org.jboss.util.NestedSQLException: Could not create connection; - nested throwable: (java.sql.SQLException: Error unmarshaling return; nested exception is:
java.io.InvalidClassException: c8e.p.a; class invalid for deserialization); - nested throwable: (org.jboss.resource.JBossResourceException: Could not create connection; - nested throwable: (java.sql.SQLException: Error unmarshaling return; nested exception is:
java.io.InvalidClassException: c8e.p.a; class invalid for deserialization)))
at org.jboss.ejb.plugins.cmp.jdbc.SQLUtil.fixTableName(SQLUtil.java:68)