CONNECTION OF POSTGRESQL database to JDEVELOPER

i'm trying to connect the database of POSTGRESQL to jdeveloper but i encountered some errors especially when i run the form.. i already check the drivers.. PLEASE REPLY IMMEDIATELY THANKS. THESE ARE THE ERRORS:
(oracle.jbo.common.ampool.ApplicationPoolException) JBO-30003: The application pool (XAMPLE.model.xampleAppModuleLocal) failed to checkout an application module due to the following exception:
----- LEVEL 1: DETAIL 0 -----
(oracle.jbo.JboException) JBO-29000: Unexpected exception caught: oracle.jbo.JboException, msg=JBO-29000: Unexpected exception caught: oracle.jbo.JboException, msg=JBO-29000: Unexpected exception caught: oracle.jbo.DMLException, msg=JBO-26061: Error while opening JDBC connection.
----- LEVEL 2: DETAIL 0 -----
(oracle.jbo.JboException) JBO-29000: Unexpected exception caught: oracle.jbo.JboException, msg=JBO-29000: Unexpected exception caught: oracle.jbo.DMLException, msg=JBO-26061: Error while opening JDBC connection.
----- LEVEL 3: DETAIL 0 -----
(oracle.jbo.JboException) JBO-29000: Unexpected exception caught: oracle.jbo.DMLException, msg=JBO-26061: Error while opening JDBC connection.
----- LEVEL 4: DETAIL 0 -----
(oracle.jbo.DMLException) JBO-26061: Error while opening JDBC connection.
----- LEVEL 5: DETAIL 0 -----
(java.sql.SQLException) No suitable driver

Hi,
I always put them in [jdev_install_dir]j2ee\home\applib (one of quite a few directories in the JDev classpath). The above document suggests <jdevhome>/jdev/lib
and also the WEB-INF\lib of your J2EE project if it is not already in the server classpath.
regards,
Brenden

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package buslogic;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.IdClass;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
@Entity
@NamedQuery(name = "TdmceApprovalStatus.findAll",
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@Table(name = "\"tdmce_approval_status\"")
@IdClass(TdmceApprovalStatusPK.class)
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@Column(nullable = false)
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@Id
@Column(nullable = false)
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private String comments;
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@Id
@Column(nullable = false)
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@Id
@Column(nullable = false)
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