Fintan Conway

Hi,

Just wondering if I could replace all my Javascript for AJAX with HTMX?

Does HTMX have other applications besides replacing AJAX javascript code?

Thanks,

Fintan

Hi,

How can a code geek with no artistic flair be made a Creative Programmer? (Thinking of myself here   )

Thanks,

Fintan

One thing I do is look for youtube videos demoing the functionality that I am looking for.

It is not ideal but has helped me reject some libraries/tools that I would have downloaded and experimented with, just to find that they did not do the job.  Mainly I find that the video helps me filter out stuff that does not do what I want.  However, if the video shows that the software has/does what I need then I have a mini-tutorial to get me started!

Downside - not every library has a video on youtube.

Code Review - Praise in coderanch, Criticise in private

OpenJPA command line enhancer
java -cp /home/fintan/JPA/openjpa-all-3.1.2.jar:. org.apache.openjpa.enhance.PCEnhancer
gives the following error:
93  howdy  INFO   [main] openjpa.Tool - Enhancer running on type "com.waycontech.jpa.model.Greeting". Exception in thread "main" java.lang.IllegalArgumentException: java.lang.ClassNotFoundException: com.waycontech.jpa.model.Greeting at serp.util.Strings.toClass(Strings.java:164)
It seems to find my class name from persistence.xml.

I have tried running the command from the directory where the java file resides (hence the dot in the classpath) and from the package root, but it refuses to find my class

What am I missing here?

Many thanks,

Fintan

Hi,

I have tried using ordinary Tomcat server with JSF 2.3 (I am using Eclipse).  Unfortunately, I am having as much problems getting JSF to work on Eclipse with Tomcat.  I have tried to get CDI working in Eclipse but to avall.  I have tried the options set out in this link Installing CDI in Tomcat, but cannot get CDI working.

If I stick to using TomEE and openJPA I am getting the following exception:

javax.el.ELException: <openjpa-3.1.2-r66d2a72 fatal user error> org.apache.openjpa.persistence.ArgumentException: No metadata was found for type "class com.waycontech.jsf.add.persistence.Student$$OwbNormalScopeProxy0". The class does not appear in the list of persistent types: [com.waycontech.jsf.add.persistence.Student].

It seems there is an inner class added to my Entity class which openJPA tries to persist instead of the class itself???

If I try to use Tomcat, I am having a problem using JSF.
If I try to use TomEE, I am having a problem with openJPA.

Any help would be appreciated,

Fintan

Hello,

I have a simple JSF 2.3 application and I am trying to use JPA to persist my data to the database.

I am using TomEE 8.0.6.

I am not using Spring.  I am not using EJB.

Unfortunately, I am getting a "Transaction required" exception when I try to persist data to the database

Feb 25, 2021 1:33:38 PM org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet [Faces Servlet] in context with path [/JSF_add_persistence] threw exception [javax.el.ELException: javax.persistence.TransactionRequiredException] with root cause javax.persistence.TransactionRequiredException at org.apache.openejb.persistence.JtaEntityManager.assertTransactionActive(JtaEntityManager.java:160) at org.apache.openejb.persistence.JtaEntityManager.persist(JtaEntityManager.java:190) at com.waycontech.jsf.add.persistence.StudentController.addStudent(StudentController.java:42) at com.waycontech.jsf.add.persistence.StudentController$$OwbNormalScopeProxy0.addStudent(com/waycontech/jsf/add/persistence/StudentController.java) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) etc.....

My configuration files
/src/META-INF/persistence.xml
<?xml version="1.0" encoding="UTF-8"?> <persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"> <persistence-unit name="JSF add persistence"> <jta-data-source>studentDatabase</jta-data-source> <non-jta-data-source>studentDatabaseUnmanaged</non-jta-data-source> <class>com.waycontech.jsf.add.persistence.Student</class> <properties> <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/> </properties> </persistence-unit> </persistence>

/WebContent/WEB-INF/resources.xml
<?xml version='1.0' encoding='UTF-8'?> <resources> <Resource id="studentDatabase" type="DataSource"> JdbcDriver org.mariadb.jdbc.Driver JdbcUrl jdbc:mariadb://localhost:3306/student_tracker UserName demo Password demo JtaManaged true    </Resource> </resources>

My Java files
package com.waycontech.jsf.add.persistence; import javax.enterprise.context.RequestScoped; import javax.inject.Named; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.Table; @Named @RequestScoped @Entity @Table(name="student") public class Student { @Id @GeneratedValue(strategy=GenerationType.AUTO) @Column(name="id") private long id; @Column(name="first_name", length=45) private String firstName; @Column(name="last_name", length=45) private String lastName; @Column(name="email", length=45) private String email; public long getId() { return id; } public void setId(long id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } @Override public String toString() { return "{  " + firstName + " " + lastName + ";  Email:  " + email + "  }"; } }

package com.waycontech.jsf.add.persistence; import java.io.Serializable; import java.util.ArrayList; import java.util.List; import javax.annotation.PostConstruct; import javax.enterprise.context.RequestScoped; import javax.enterprise.context.SessionScoped; import javax.faces.application.FacesMessage; import javax.faces.context.FacesContext; import javax.inject.Inject; import javax.inject.Named; import javax.persistence.EntityManager; import javax.persistence.NoResultException; import javax.persistence.PersistenceContext; import javax.persistence.Query; import javax.persistence.criteria.CriteriaQuery; //@SessionScoped @RequestScoped @Named public class StudentController implements Serializable { /** * */ private static final long serialVersionUID = 1L; @PersistenceContext(unitName="JSF add persistence") private EntityManager entityManager; private List<Student> students; public StudentController() throws Exception { students = new ArrayList<>(); } //@TransactionAttribute(TransactionAttributeType.REQUIRED) public void addStudent(Student student) { System.out.println("Adding Student ::" + student); // entityManager.getTransaction().begin(); entityManager.persist(student); // entityManager.getTransaction().commit(); } public List<Student> getStudents() { return students; } public void setStudents(List<Student> students) { this.students = students; } public void loadStudents() { // Retrieve the list of students from the DB // Fill the 'students' Array list // entityManager.getTransaction().begin(); CriteriaQuery<Student> cq = entityManager.getCriteriaBuilder().createQuery(Student.class); cq.select(cq.from(Student.class)); students = entityManager.createQuery(cq).getResultList(); // entityManager.getTransaction().commit(); } private void addErrorMessage(Exception ex) { FacesMessage message = new FacesMessage("Error :  " + ex.getMessage()); FacesContext.getCurrentInstance().addMessage(null, message); } }

My JSF page
/WebContent/addStudentForm.xhtml
<!DOCTYPE html> <html lang="en"      xmlns="http://www.w3.org/1999/xhtml"      xmlns:h="http://xmlns.jcp.org/jsf/html"      xmlns:ui="http://xmlns.jcp.org/jsf/facelets"      xmlns:f="http://xmlns.jcp.org/jsf/core"      xmlns:pt="http://xmlns.jcp.org/jsf/passthrough">       <h:head> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <meta http-equiv="Content-Type" content="text-html; charset=UTF-8" /> <title>Add Student</title> <h:outputStylesheet library="css" name="listStudents.css"/> </h:head> <h:body> <ui:debug hotkey="q" render="true"/> <div id="wrapper"> <div id="header"> <h2>Foobar University</h2> </div> </div> <div id="container"> <h3>Add Student</h3> <h:messages globalOnly="true" /> <h:form id="addStudentForm"> <h:panelGrid columns="3"> <h:outputLabel for="addStudentFirst">First Name :</h:outputLabel> <h:inputText value="#{student.firstName}" id="addStudentFirst" pt:placeholder="First name"/> <h:message for="addStudentFirst" /> <h:outputLabel for="addStudentLast">Last Name :</h:outputLabel> <h:inputText value="#{student.lastName}" id="addStudentLast" pt:placeholder="Last name"/> <h:message for="addStudentLast" /> <h:outputLabel for="addStudentEmail">Email :</h:outputLabel> <h:inputText value="#{student.email}" required="true" id="addStudentEmail" pt:placeholder="Email Address" requiredMessage="Your email is mandatory." /> <h:message for="addStudentEmail" /> <h:commandButton value="Add Student" action="#{studentController.addStudent(student)}" /> </h:panelGrid> </h:form> <p><h:outputLink value="addStudentList.xhtml">Back to list</h:outputLink></p> </div> </h:body> </html>

When I call studentController.addStudent(student) the error gets thrown on the line entityManager.persist(student);

I know the DB connection is working because the following page calls studentController.loadStudents() and displays a list of the students.

/WebContent/addStudentList.xhtml
<!DOCTYPE html> <html lang="en"      xmlns="http://www.w3.org/1999/xhtml"      xmlns:h="http://xmlns.jcp.org/jsf/html"      xmlns:ui="http://xmlns.jcp.org/jsf/facelets"      xmlns:f="http://xmlns.jcp.org/jsf/core"      xmlns:a="http://xmlns.jcp.org/jsf/passthrough">       <f:event listener="#{studentController.loadStudents()}" type="preRenderView" />       <h:head> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <meta http-equiv="Content-Type" content="text-html; charset=UTF-8" /> <title>Student Tracker App</title> <h:outputStylesheet library="css" name="listStudents.css"/> </h:head> <h:body> <div id="wrapper"> <div id="header"> <h2>Foobar University</h2> </div> </div> <div id="container"> <div id="content"> <h:messages globalOnly="true" /> <h:button value="Add Student" styleClass="addStudentButton" outcome="addStudentForm" /> <h:form> <h:dataTable value="#{studentController.students}" var="varStudent" border="1" styleClass="demoTable" headerClass="demoTableHeader" rowClasses="demoTableOddRow, demoTableEvenRow"> <h:column> <f:facet name="header">First Name</f:facet> #{varStudent.firstName} </h:column> <h:column> <f:facet name="header">Last Name</f:facet> #{varStudent.lastName} </h:column> <h:column> <f:facet name="header">Email</f:facet> #{varStudent.email} </h:column> </h:dataTable> </h:form> </div> </div> <h:messages /> </h:body> </html>

Any ideas on how to get the transactions working?

Many thanks

Hi,

I am a jQuery newbie, and am trying the example for popup from the site JQuery demo popup.

Here is my complete code :
<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <title>Popup test</title> <link rel="stylesheet" href="http://code.jquery.com/mobile/1.2.1/jquery.mobile-1.2.1.min.css" /> <link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/themes/base/jquery-ui.css" /> <script src="http://code.jquery.com/jquery-2.1.0.min.js"></script> <script src="http://code.jquery.com/mobile/1.2.1/jquery.mobile-1.2.1.min.js"></script> </head> <body> <a href="#popupBasic" data-role="button" data-rel="popup" data-inline="true">Open Popup</a> <div data-role="popup" id="popupBasic"> <p>This is a completely basic popup, no options set.<p> </div> </body> </html>

but the popup text appears on the page, and nothing happens when I click on the link.

Am I missing a css file or a javascript file? Is there something even more basic that I am missing?

I am not even sure that I need the jquery-ui.css file.

Thanks for your help,

Fintan

Stefan Evans wrote:
Ok... fine...: go look at include directive vs include tag

Thanks for this.

Where does the RequestDispatcher fit into this scenario?

Can it be replaced by <@ include "header.jsp">? or by <jsp:include "header.jsp" />?

Or is it a different beast altogether?

Thanks again,

Fintan

Hi,

Simple question (hopefully). Is there a difference between using the include directive and RequestDispatcher.include().

E.g.
<%@ include "header.jsp">
vs
RequestDispatcher rd = getServletContext().getRequestDispatcher("header.jsp"); rd.include(request, response);

Thanks

Christophe Verré wrote:This is not a JSP problem that you have here, but an Eclipse problem. Make sure your web application is configured to use your class files. I'm moving your thread to the Eclipse forum.

Hi,

How do I do the above?

Many thanks

I have been to https://jstl.dev.java.net/ to try and download the JSTL library. It redirects to http://java.net/projects/jstl/ which does not allow me to download the JSTL library.

Is there anywhere that I can download the JSTL library. Oracle site seems to be one big circle jerk when looking to download.

Many thanks

John de Michele wrote:Fintan:

Have you googled 'JMF javadoc'? I found information right away.

John.

Hi John,

I have tried this. Unfortunately there is no information on how to programmatically play an MP3 file, using either JMF or the MP3 plugin. I could find no javadocs for the mp3 plugin.

Could you post links to where you found sample code / javadocs for coding to play MP3 files please?

Many thanks,

Fintan

Wouter Oet wrote:Have you tried the JMF MP3 plugin?

Hi Wouter,

I have downloaded this and installed it. However I cannot find any documentation on how to use it within my code. Do you have any links/suggestions on how to code using this mp3plugin.jar?

Many thanks