postgresql 8.4 type mapping problem

I defined a filed with "character" type,how to mapping this type to java.
I hava used "char" ,"Character","String","Integer".they are all error.

here is the Exception info
"Caused by: java.lang.IllegalArgumentException: Can't change resolved type
for param: 8 from 1043 to 1042
at
org.postgresql.core.v3.SimpleParameterList.setResolvedType(SimpleParameterList.java:230)
at
org.postgresql.core.v3.QueryExecutorImpl.sendOneQuery(QueryExecutorImpl.java:1488)
at
org.postgresql.core.v3.QueryExecutorImpl.sendQuery(QueryExecutorImpl.java:1062)
at
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:255)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:479)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:367)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:321)
at
org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:102)
at org.apache.commons.dbutils.QueryRunner.update(QueryRunner.java:611)
at com.spirit.spark.helper.QueryHelper.update(QueryHelper.java:317)
at com.spirit.spark.models.Users.addUser(Users.java:37)
at
com.spirit.spark.controllers.SignupController.submit(SignupController.java:60)
... 27 more"

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