>>>>>  CORRETO:
<property name="javax.persistence.jdbc.url" value="jdbc:postgresql://localhost:5432/meuprojetojsf"/>
<property name="javax.persistence.jdbc.user" value="postgres"/>
<property name="javax.persistence.jdbc.password" value="admin" />
<property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver" />
<property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.format_sql" value="true" />
<property name="hibernate.hbm2ddl.auto" value="update" />
<property name="javax.persistence.schema-generation.drop-source" value="script-then-metadata"/>



Errado
<property name="hibernate.connection.diver_class" value="org.postgresql.Driver"/>
<property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5432/meuprojetojsf"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect"/>
<property name="hibernate.connection.username" value="postgres"/>
<property name="hibernate.connection.password" value="admin"/>
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.format_sql" value="true"/>
<property name="hibernate.hbm2ddl.auto" value="update"/>
<property name="javax.persistence.schema-generation.drop-source" value="script-then-metadata"/>