Java EE (Java Enterprise Edition) General Discussion

Hi everybody.

I have developed an application using JHeadstart 9.0.5.1 (UIX/Struts/BC4J) and JDeveloper 9.0.5.2.
Because of before mentioned bug in OC4J 9.0.4, we are using OC4J 9.0.3 and jre 1.4.2_03 which is included in JDeveloper 9.0.5.2.
Having deployed the application, we encounter the following error, each time we wanted to call a LOV.

OracleJSP: oracle.jsp.provider.JspCompileException:
Errors compiling:E:\NgcTestEnvironment\oc4j\j2ee\home\application-deployments\MainPage\MainPage\persistence\_pages\_jheadstart\_lovFrame.java
error: Invalid class file format in E:\Jdev10g_\jdk\jre\lib\rt.jar(java/net/URLEncoder.class). The major.minor version '48.0' is too recent for this tool to understand.
E:\NgcTestEnvironment\oc4j\j2ee\home\application-deployments\MainPage\MainPage\persistence\_pages\_jheadstart\_lovFrame.java:7: Class java.net.URLEncoder not found in import.
import java.net.URLEncoder;
^
error: Invalid class file format in E:\Jdev10g_\jdk\jre\lib\rt.jar(java/lang/Object.class). The major.minor version '48.0' is too recent for this tool to understand.
E:\NgcTestEnvironment\oc4j\j2ee\home\application-deployments\MainPage\MainPage\persistence\_pages\_jheadstart\_lovFrame.java:0: Class java.lang.Object not found in class com.orionserver.http.OrionHttpJspPage.
package _jheadstart;
^
4 errors

Is there anybody know what I should do ?
Thanks in advanced.
Navid.