Jasper Reports "package net.sf.jasperreports.engine does not exist" exception in JDeveloper 11.1 using WebLogic only in EAR Web Page - jar

Question

I'm using JDeveloper 11.1, Oracle 11 and TIBCO JasperReports 6.0.1.
I'm having problems trying to generate Jasper Reports from my web page (ViewController) while using an ApplicationModule (Model - EJB) for doing that. At the end the PDF file has to be sent via email, that's why I let it into the Model project.
If I execute the ApplicationModule, it works fine, no exceptions, the PDF is very well generated and sent.
However, if I execute the client method since a web page I got this exception :
net.sf.jasperreports.engine.JRException: Errors were encountered when compiling report expressions class file:
C:\Users\rodmar\AppData\Roaming\JDeveloper\system11.1.1.7.40.64.93\DefaultDomain\Simple_Blue_1429546047623_56582.java:4: package net.sf.jasperreports.engine does not exist
import net.sf.jasperreports.engine.*;
^
C:\Users\rodmar\AppData\Roaming\JDeveloper\system11.1.1.7.40.64.93\DefaultDomain\Simple_Blue_1429546047623_56582.java:5: package net.sf.jasperreports.engine.fill does not exist
import net.sf.jasperreports.engine.fill.*;
^
C:\Users\rodmar\AppData\Roaming\JDeveloper\system11.1.1.7.40.64.93\DefaultDomain\Simple_Blue_1429546047623_56582.java:18: cannot find symbol
symbol: class JREvaluator
public class Simple_Blue_1429546047623_56582 extends JREvaluator
^
C:\Users\rodmar\AppData\Roaming\JDeveloper\system11.1.1.7.40.64.93\DefaultDomain\Simple_Blue_1429546047623_56582.java:25: cannot find symbol
symbol : class JRFillParameter
location: class Simple_Blue_1429546047623_56582
private JRFillParameter parameter_REPORT_LOCALE = null;
^
C:\Users\rodmar\AppData\Roaming\JDeveloper\system11.1.1.7.40.64.93\DefaultDomain\Simple_Blue_1429546047623_56582.java:26: cannot find symbol
symbol : class JRFillParameter
location: class Simple_Blue_1429546047623_56582
private JRFillParameter parameter_Description = null;
^
C:\Users\rodmar\AppData\Roaming\JDeveloper\system11.1.1.7.40.64.93\DefaultDomain\Simple_Blue_1429546047623_56582.java:27: cannot find symbol
symbol : class JRFillParameter
location: class Simple_Blue_1429546047623_56582
private JRFillParameter parameter_JASPER_REPORT = null;
^
C:\Users\rodmar\AppData\Roaming\JDeveloper\system11.1.1.7.40.64.93\DefaultDomain\Simple_Blue_1429546047623_56582.java:28: cannot find symbol
symbol : class JRFillParameter
location: class Simple_Blue_1429546047623_56582
private JRFillParameter parameter_REPORT_VIRTUALIZER = null;
^
I'm just pasting a fragment.
I'm using other .jars as POI, for reading .xlsx files and inserting then into database so I don't know why I can access POI without any problem but at the same time I don't have Jasper Reports available.
I have already searched some solutions in the web but nothing solves my problems. I get some information about jdt-compiler but I don't find it into JasperReports suite. My project is really a mess with all these libraries, maybe I'm missing or adding too many ?
My EAR project at the moment is like this :
The EAR\lib:
This is a kind of a problem for jars settings, or something like that. I had already found this page but it is really strange, I don't think that my issue is something so complicated.
http://docs.oracle.com/cd/E25178_01/fusionapps.1111/e15524/adv_wls_e.htm
EDIT 1 :
I tried to look to my classpath using this code :
ClassLoader cl = ClassLoader.getSystemClassLoader();
URL[] urls = ((URLClassLoader)cl).getURLs();
for (URL url: urls) {
logger.info(String.format("Classpath: %s.", url.toString()));
}
And I get this output. POI is not here but why, I'm using it without any problems while I'm not been capable of using JasperReports ?
1 ) Is POI.jar by default used in WebLogic 10.3 basic installation ? NO
EDIT 2 :
I've discovered that in WebLogic is necessary to access weblogic.utils.classloaders.GenericClassLoader which sends me all the libraries that belong to this EAR application. Using it, Jasper Reports are available however I don't know what to do to access them successfully...
GenericClassLoader jre = (GenericClassLoader) JREvaluator.class.getClassLoader();
logger.info(String.format("jre: %s, s.", jre, jre.getClassPath()));
Thanks you very much,

Answer 1

Well, as somebody says it was necessary to use jdt-compiler-3.1.1.jar. I added it to /lib folder and now it is working.
It's really strange that this .jar is not in the installation product for TIBCO Jasper Reports 6.0.0 actually I descend until JR 3.7.6 which is the lowest version. The file is from 28/12/2008...
Nice...

Answer 2

I used eclipse ecj-4.3.1.jar and it works.

Answer 3

First checks the dependencies of jasperReports - for example version 6.1.0 - https://mvnrepository.com/artifact/net.sf.jasperreports/jasperreports/6.1.0
With this you can see if there is any dependency that is missing in your lib directory (webApp) or inside your .jar (if it is a main application of java).
That mistake also happened to me, and I solved it by adding dependence
<groupId>org.eclipse.jdt.core.compiler</groupId>
<artifactId>ecj</artifactId>
<version>4.3.1</version>
I hope it supports you