How to call precedure in impl into java bean

Dear all,
i'm tried to call procedure at impl.java into java bean.
but, there is error which is it cannot find the root of this.getDBTranstation
any idea.
TQ

Hi
Please tell me
How to call ethod in AppModuleImpl from other bean?
I have created method in AppModuleImpl
public String callFuncWithArgs(String p_company, String p_division, String p_user, String p_wrkord_type,
String p_service_type, String p_HOLD_CODE_TYPE) {
return (String)callStoredFunction(VARCHAR2, "WS_tran.Margin_TO_USER(?,?,?,?,?,?)",
new Object[] { p_company, p_division, p_user, p_wrkord_type, p_service_type,
p_HOLD_CODE_TYPE });
This method is working after run APPModule. But I want to call this method from SparesTEOImpl class and
public boolean validateUnitPrice(int unitprice) {
//want to call here AppModuleImpl
callFuncWithArgs(String p_company, String p_division, String p_user, String p_wrkord_type,
                                   String p_service_type, String p_HOLD_CODE_TYPE) here
Please tell me how to call , I wrote in following ways but I got error...
public boolean validateUnitPrice(int unitprice) {
String margin=appImpl.callFuncWithArgs("00004","SDWSG", "S1","CSH", "SP","M");
System.out.println("Output"+margin);
return margin;
After that I got the following error.
Exception in thread "main" oracle.jbo.InvalidOwnerException: JBO-25301: Application module AppModuleImpl_0 is not a root app module but has no parent
    at oracle.jbo.server.ComponentObjectImpl.getRootApplicationModule(ComponentObjectImpl.java:177)
    at oracle.jbo.server.ApplicationModuleImpl.getDBTransaction(ApplicationModuleImpl.java:3656)
    at model.AppModuleImpl.callStoredFunction(AppModuleImpl.java:128)
    at model.AppModuleImpl.callFuncWithArgs(AppModuleImpl.java:160)
    at model.SparesTEOImpl.validateUnitPrice(SparesTEOImpl.java:55)
    at model.SparesTEOImpl.main(SparesTEOImpl.java:67)
Process exited with exit code 1.
Please tell me how to solve this problem...

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How to call precedure in impl into java bean

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