I have questions

hi,
 
I use struts to connect to postgre. In my struts-config.xml, I write this code to config to database
 
<data-sources>
<data-source key="DATA_SOURCE">
<set-property property="user" value="tele" />
<set-property property="password" value="tiny" />
<set-property property="driverClass" value="org.postgresql.Driver" />
<set-property property="autoCommit" value="false" />
<set-property property="url" value="jdbc:postgresql://localhost:5432/task" />
</data-source>
 
there are error happening:
java.sql.SQLException: ERROR: unrecognized configuration parameter "xactisolevel"
 
who can help me to resolve it. Thanks a lot!!!

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