SubReport problem

[aymenbann]

i have a master and a subReport, they work fine with ireport, but when i try to get them from java class, an exception is always rising :

GRAVE: java.lang.ClassCastException: cannot assign instance of net.sf.jasperreports.engine.base.JRBaseTextField to field net.sf.jasperreports.engine.base.JRBaseParagraph.paragraphContainer of type net.sf.jasperreports.engine.JRParagraphContainer in instance of net.sf.jasperreports.engine.base.JRBaseParagraph
 at java.io.ObjectStreamClass$FieldReflector.setObjFieldValues(ObjectStreamClass.java:2032)
 at java.io.ObjectStreamClass.setObjFieldValues(ObjectStreamClass.java:1212)
 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1953)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
 at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:480)
 at net.sf.jasperreports.engine.base.JRBaseTextElement.readObject(JRBaseTextElement.java:1157)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
 at java.util.ArrayList.readObject(ArrayList.java:593)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
 at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1667)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1323)
 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
 at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:88)
 at net.sf.jasperreports.engine.util.JRLoader.loadObjectFromLocation(JRLoader.java:257)
 at net.sf.jasperreports.engine.util.JRLoader.loadObjectFromLocation(JRLoader.java:226)

 

the java method is :

JasperDesign design = JRXmlLoader.load(new LegacyJasperInputStream(new FileInputStream(FacesContext.getCurrentInstance().getExternalContext().getRealPath("/WEB-INF/jasperConfigFiles/master.jrxml"))) );
                JasperReport jasperReport=JasperCompileManager.compileReport(design);
                JasperPrint jasperPrint =JasperFillManager.fillReport(jasperReport,parameters,connection);

the master.jrxml contains a subReport, please how can i fix this problem ???