dominikdorn.com » Open Source http://dominikdorn.com shit happens ;) Tue, 03 Jan 2012 19:47:31 +0000 en hourly 1 http://wordpress.org/?v=3.3 Using JPA EntityListener Annotations with Avaje Ebean http://dominikdorn.com/2012/01/jpa-entity-listener-annotations-avaje-ebean/ http://dominikdorn.com/2012/01/jpa-entity-listener-annotations-avaje-ebean/#comments Tue, 03 Jan 2012 19:11:56 +0000 Dominik Dorn http://dominikdorn.com/?p=359 While migrating a project of mine from JPA2 to Avaje Ebean, I encountered a issue, I wasn’t expecting.

Avaje Ebean does not support the JPA EntityListener Annotations, like

@PrePersist,
@PostPersist,
@PreUpdate,
@PostUpdate,
@PostLoad

Some nice folks on the Ebean Mailinglist directed me to some Documentation about EntityListeners in Ebean including a helpful forum link which finally pointed me to the BeanPersistController Interface in the Ebean Java API .
With that Information, I was able to create a EntityListener that enables the use of the JPA EntityListener Annotations with Ebean.

This Gist shows how I’ve done it:

package models.sgcore;

import com.avaje.ebean.event.BeanPersistAdapter;
import com.avaje.ebean.event.BeanPersistRequest;

import javax.annotation.PreDestroy;
import javax.persistence.*;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;

/**
 * This is a <code>BeanPersistController</code> that looks for methods annotated with the JPA Annotations
 * <code>@PrePersist</code>
 * <code>@PostPersist</code>
 * <code>@PreUpdate</code>
 * <code>@PostUpdate</code>
 * <code>@PreDestroy</code>
 * <code>@PostLoad</code>
 *
 * registers those methods with this Listener and calls them when necessary.
 */
public class SGBeanPersistController extends BeanPersistAdapter {
    
    private Map<String,Method> prePersistMap = new TreeMap<String, Method>();
    private Map<String,Method> postPersistMap = new TreeMap<String, Method>();

    private Map<String,Method> preUpdateMap = new TreeMap<String, Method>();
    private Map<String,Method> postUpdateMap = new TreeMap<String, Method>();

    private Map<String,Method> preDestroyMap = new TreeMap<String, Method>();

    private Map<String,Method> postLoadMap = new TreeMap<String, Method>();




    
    @Override
    public boolean isRegisterFor(Class<?> aClass) {
        if(aClass.getAnnotation(Entity.class) != null){
            System.out.println("Registering a Entity; Type is " + aClass.toString());
            Method[] methods = aClass.getMethods();
            boolean hasListener = false;
            for(Method m : methods)
            {
//                System.out.println("looking if method " + m.toString() + " has Annotation on it. ");
                if(m.isAnnotationPresent(PrePersist.class))
                {
                    prePersistMap.put(aClass.getName(), m);
                    hasListener = true;
                }
                
                if(m.isAnnotationPresent(PostPersist.class))
                {
                    postPersistMap.put(aClass.getName(), m);
                    hasListener = true;
                }
                
                if(m.isAnnotationPresent(PreDestroy.class))
                {
                    preDestroyMap.put(aClass.getName(), m);
                    hasListener = true;
                }
                
                if(m.isAnnotationPresent(PreUpdate.class))
                {
                    preUpdateMap.put(aClass.getName(), m);
                    hasListener = true;
                }
                
                if(m.isAnnotationPresent(PostUpdate.class))
                {
                    postUpdateMap.put(aClass.getName(), m);
                    hasListener = true;
                }

                if(m.isAnnotationPresent(PostLoad.class))
                {
                    postLoadMap.put(aClass.getName(), m);
                    hasListener = true;
                }


            }
            return hasListener;
        }
        return false;
    }

    
    private void getAndInvokeMethod(Map<String,Method> map, Object o)
    {
        Method m = map.get(o.getClass().getName());
        if(m != null)
            try {
                m.invoke(o);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            }
    }

    @Override
    public boolean preInsert(BeanPersistRequest<?> request) {
        getAndInvokeMethod(prePersistMap, request.getBean());
        return super.preInsert(request);
    }

    @Override
    public boolean preDelete(BeanPersistRequest<?> request) {
        getAndInvokeMethod(preDestroyMap, request.getBean());
        return super.preDelete(request);
    }

    @Override
    public boolean preUpdate(BeanPersistRequest<?> request) {
        getAndInvokeMethod(preUpdateMap, request.getBean());
        return super.preUpdate(request);
    }

    @Override
    public void postDelete(BeanPersistRequest<?> request) {
        // there is no @PostDestroy annotation in JPA 2
        super.postDelete(request);
    }

    @Override
    public void postInsert(BeanPersistRequest<?> request) {
        getAndInvokeMethod(postPersistMap, request.getBean());
        super.postInsert(request);
    }

    @Override
    public void postUpdate(BeanPersistRequest<?> request) {
        getAndInvokeMethod(postUpdateMap, request.getBean());
        super.postUpdate(request);
    }

    @Override
    public void postLoad(Object bean, Set<String> includedProperties) {
        getAndInvokeMethod(postLoadMap, bean);
        super.postLoad(bean, includedProperties);
    }
}

view raw SGBeanPersistController.java This Gist brought to you by GitHub.

Questions? Comments? Forks?

I appreciate any kind of feedback! :)

]]> http://dominikdorn.com/2012/01/jpa-entity-listener-annotations-avaje-ebean/feed/ 0 Essential Glassfish Performance Tuning Blogs http://dominikdorn.com/2010/06/essential-glassfish-performance-tuning-blogs/ http://dominikdorn.com/2010/06/essential-glassfish-performance-tuning-blogs/#comments Mon, 14 Jun 2010 14:42:53 +0000 Dominik Dorn http://dominikdorn.com/?p=308 In my time on the Glassfish users mailinglist, I came across some important links for everyone setting up a Glassfish server for production.

This is my personal bookmarks list, that may also serve its purpose to others.

  1. Putting Glassfish v3 in Production – Essential surviving Guide: This post describes basic performance enhancements you can get with changing settings in your domain.xml configuration and adjusting jvm settings
  2. Monitoring in Glassfish: This post shows how to further enhance the thread pool settings for your Glassfish domain and how to determine the correct settings for your system
  3. Tomcat/Glassfish/Jetty on Port 80 with IPTables + NAT: This post describes, how you can run your Glassfish hosted webapps on Port 80 without running a Apache or other web server in front of it, thus you are able to fully utilize every aspect of Glassfishs new asynchronous architecture without always have to think of that old Indian making problems (Comet etc.)
  4. Blog Post on Java.net: This post by user "radix_zero" also suggests a few other tricks, like creating multiple connection pools to the same data source or running multiple real-domains, each in a own JVM.
  5. Another Post on Java.net: The thread points out that one should use distinct thread pools for each http-listener to prevent locking between the listeners

This post will be updated with new additional & helpful links, as soon as I get aware of them.

Do you have interesting links? Post them in the comments!

]]> http://dominikdorn.com/2010/06/essential-glassfish-performance-tuning-blogs/feed/ 0 Maven + JUnit + ClassFormatError: Absent Code attribute in method that is not native or abstract in class file http://dominikdorn.com/2010/05/maven-junit-classformaterror-absent-code-attribute/ http://dominikdorn.com/2010/05/maven-junit-classformaterror-absent-code-attribute/#comments Tue, 11 May 2010 19:39:29 +0000 Dominik Dorn http://dominikdorn.com/?p=294 Once in a while one stumbles upon an error message like this

java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/mail/Session

This happens if your code compiles against incomplete classes, like the JavaEE6 Api and your Unit tests try to access code thats not there. JUnit will simply fail and mark the test as error, printing something like this

Tests in error:
  initializationError(com.dominikdorn.dc.passwordReset.SimplePasswordResetServiceTest)

and the corresponding surefire text file starts like this:

-------------------------------------------------------------------------------
Test set: com.dominikdorn.dc.passwordReset.SimplePasswordResetServiceTest
-------------------------------------------------------------------------------
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.022 sec <<< FAILURE!
initializationError(com.dominikdorn.dc.passwordReset.SimplePasswordResetServiceTest)  Time elapsed: 0.005 sec  <<< ERROR!
java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/mail/Session
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
....

The Solution
You have to compile against real-implementations of the classes. You do that by adding those dependencies before the most generic dependency in your pom.xml

As example, we add javax.mail BEFORE javaee6-api like this

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<project ...>
...
    <dependencies>
 
        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>6.0</version>
            <scope>provided</scope>
        </dependency>
</project>

If you are deploying your App on an Appserver like Glassfish or JBoss AS, leave the scope of javax.mail:mail as provided to prevent the inclusion of the jar in the final webapp.

I now list required dependencies for various Absent Code Errors I've encountered and still encountering. This post will be updated every time I solve another of these problems.

JavaMail: javax/mail/Session

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<project ...>
...
    <dependencies>
        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
</project>

Servlet 3.0

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<project ...>
...
    <dependencies>
               <dependency>
                       <groupId>org.glassfish</groupId>
                       <artifactId>javax.servlet</artifactId>
                       <version>3.0</version>
                       <scope>provided</scope>
               </dependency>
...
    </dependencies>
....   
    <repositories>
               <!-- Required until the Servlet 3.0 API can be resolved in Central -->     
               <repository>
                       <id>Glassfish</id>
                       <name>Glassfish Maven2 Repository</name>
                       <url>http://download.java.net/maven/glassfish/</url>
               </repository>
    </repositories>
 </project>

JPA2: javax/persistence/PersistenceException

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<dependencies>...
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>javax.persistence</artifactId>
            <version>2.0.0</version>
            <scope>provided</scope>
        </dependency>
...</dependencies>
..
<repositories>
...
    <repositories>
...
        <repository>
            <id>eclipse</id>
            <name>Eclipse Maven Repository</name>
            <url>http://www.eclipse.org/downloads/download.php?r=1&amp;nf=1&amp;file=/rt/eclipselink/maven.repo</url>
        </repository>
    </repositories>

JAX-RS: javax/ws/rs/core/UriBuilder

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        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-core</artifactId>
            <version>1.1.5</version>
            <scope>provided</scope>
        </dependency>
<!-- for json support -->
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-json</artifactId>
            <version>1.1.5</version>
            <scope>provided</scope>
        </dependency>
<!-- for testing --> 
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-test-framework</artifactId>
            <version>1.1.5.1</version>
            <scope>test</scope>
        </dependency>

more to come soon!

]]> http://dominikdorn.com/2010/05/maven-junit-classformaterror-absent-code-attribute/feed/ 4 XHTML strict & OL start=”xx” http://dominikdorn.com/2010/04/xhtml-strict-ol-start/ http://dominikdorn.com/2010/04/xhtml-strict-ol-start/#comments Mon, 26 Apr 2010 11:53:19 +0000 Dominik Dorn http://dominikdorn.com/?p=287 In XHTML strict, the ol-tag does not have the attribute start.

To get this working again, simply create a css-class

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.counterList li {display: block }
.counterList li:before {content: counter(start) ". "; counter-increment: start}

and surround your list with a tag like this

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<div class='counterList>
<ol style="counter-reset: start 4">
<li>this will be item 5</li>
<li>this will be item 6</li>
...
</ol>
</div>

I got this idea from http://www.timrivera.com/tests/ol-start.html

]]> http://dominikdorn.com/2010/04/xhtml-strict-ol-start/feed/ 0 Feeling like home in Xubuntu: Gentoo colors! http://dominikdorn.com/2010/02/feeling-like-home-in-xubuntu-gentoo-colors/ http://dominikdorn.com/2010/02/feeling-like-home-in-xubuntu-gentoo-colors/#comments Tue, 09 Feb 2010 01:22:23 +0000 Dominik Dorn http://dominikdorn.com/?p=178 Geekscrap posted what one needs to change to feel like home in [X|K|Ed]ubuntu, at least if we’re talking about the beautiful colors, Gentoo users like the most!

http://geekscrap.com/2010/01/gentooize-part-1-colorize-console/

or, if the site does not load, try it with the cached version
cache:http://geekscrap.com/2010/01/gentooize-part-1-colorize-console/

]]> http://dominikdorn.com/2010/02/feeling-like-home-in-xubuntu-gentoo-colors/feed/ 0 Spring Security Facelets/JSF 2.0 Taglib released in v0.3 http://dominikdorn.com/2010/01/spring-security-faceletsjsf-2-0-taglib-released-in-v0-3/ http://dominikdorn.com/2010/01/spring-security-faceletsjsf-2-0-taglib-released-in-v0-3/#comments Sun, 10 Jan 2010 15:42:10 +0000 Dominik Dorn http://dominikdorn.com/?p=173 The Spring Security Facelets/JSF 2.0 Taglib got released in version 0.3.

CHANGES:

  • Replaced roles.isEmpty() with roles.equals(“”) to allow usage with Java 5
  • Adopted taglib for usage with Spring 3/Spring Security 3 final
  • removed faces-config.xml in taglibs for jsf 1.2 as it prevented deploying in some scenarios

Fetch it from the Project Homepage

]]> http://dominikdorn.com/2010/01/spring-security-faceletsjsf-2-0-taglib-released-in-v0-3/feed/ 0 FileUpload with JSF 2 and Servlet 3.0 http://dominikdorn.com/2009/12/fileupload-with-jsf-2-and-servlet-3-0/ http://dominikdorn.com/2009/12/fileupload-with-jsf-2-and-servlet-3-0/#comments Mon, 28 Dec 2009 23:11:28 +0000 Dominik Dorn http://dominikdorn.com/?p=169 As I had serious problems with FileUpload and the existing “solutions”, mainly Tomahawk, MyFaces, RichFaces, PrimeFaces, etc. which are all not 100% ready for JSF 2.

I created a taglib based on the code of BalusC.
You can find the Taglib on Github

The source code is based on these two posts:

  1. Uploading files in Servlet 3.0
  2. Uploading files with JSF 2.0 and Servlet 3.0

Simply check out the code with git

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git clone http://github.com/domdorn/fileUploadServlet3JSF2.git

then install the taglib with

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mvn clean compile install

and import it into your maven project like this

net.balusc
fileUploadServlet3JSF2
1.0-SNAPSHOT

You can then use the taglib in your Facelets files like this:

Upload.xhtml

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"
	xmlns:h="http://java.sun.com/jsf/html"
	xmlns:f="http://java.sun.com/jsf/core"
	xmlns:ui="http://java.sun.com/jsf/facelets"
	xmlns:hh="http://balusc.net/jsf/html"
>
<h:head>
	<title>FileUploadTest</title>
</h:head>
<body>
 
<h:form prependId="false">
 
	<h:messages globalOnly="false" id="messages"/>
 
	<h:panelGrid columns="3">
 
			<label for="someText">
				SomeText:
			</label>
 
			<h:inputText id="someText" value="#{uploadBean.someText}" required="true">
				<f:ajax event="blur" render="someText someTextMessage" execute="@this"/>
			</h:inputText> <h:message for="someText" id="someTextMessage"/>
 
			<label for="filenameText">
			Filename:
			</label>
 
			<h:inputText id="filenameText" value="#{uploadBean.filename}" required="true">
				<f:ajax event="blur" render="filenameText filenameTextMessage" execute="@this" />
			</h:inputText>
			<h:message for="filenameText" id="filenameTextMessage"/>
	</h:panelGrid>
	</h:form>
 
	<h:form enctype="multipart/form-data" prependId="false">
	<h:panelGrid columns="3">
		<h:outputLabel for="uploadedFile" rendered="#{empty uploadBean.file}">
				Input File:
		</h:outputLabel>
		<hh:inputFile id="uploadedFile" value="#{uploadBean.file}" rendered="#{empty uploadBean.file}">
			<f:validator validatorId="fileValidator"/>
		</hh:inputFile>
		<h:message for="uploadedFile"/>
	</h:panelGrid>
	<h:commandButton value="submit" action="#{uploadBean.submit}" />
</h:form>
</body>
</html>

The bean:

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package com.dominikdorn.simpleFileUpload.beans;</code>
 
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.bean.SessionScoped;
import javax.faces.bean.ViewScoped;
import java.io.File;
 
@ViewScoped
@ManagedBean
public class UploadBean {
 
private File file;
private String filename;
 
public String getFilename() {
return filename;
}
 
public void setFilename(String filename) {
System.out.println("binding filename");
this.filename = filename;
}
 
public String submit()
{
System.out.println("calling submit");
 
if(file != null)
{
this.filename = file.getName();
}
 
System.out.println("processed");
// do what you want with the file
return "yeah";
}
 
public UploadBean() {
}
 
public File getFile() {
return file;
}
 
public void setFile(File file) {
this.file = file;
}
 
private String someText;
 
public String getSomeText() {
return someText;
}
 
public void setSomeText(String someText) {
System.out.println("binding someText");
this.someText = someText;
}
}
]]> http://dominikdorn.com/2009/12/fileupload-with-jsf-2-and-servlet-3-0/feed/ 8 Quercus + PostgreSQL + JNDI + PEAR::DB http://dominikdorn.com/2009/12/quercus-postgresql-jndi-peardb/ http://dominikdorn.com/2009/12/quercus-postgresql-jndi-peardb/#comments Fri, 11 Dec 2009 02:16:05 +0000 Dominik Dorn http://dominikdorn.com/?p=146 If you trying to migrate a legacy PHP application which still uses PEAR::DB to Quercus with PostgreSQL and JDBC-Connection Pools accessible through JNDI, this may come handy for you!

1. Create your Datasource e.g. in Glassfish v3′s admin console… I named mine jdbc/postgresDS

2. copy the file pgsqljndi.php to /usr/share/php/DB/pgsqljndi.php (or wherever you include your PEAR stuff from..)

3. change the database connection creation part of your script to this:

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$db = & DB::connect("pgsqljndi://java:comp/env/jdbc/postgresDS");
if(DB::isError($db))
{
// error handling
}

4. remove stuff like this from your scripts

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$db->query("SET NAMES 'utf-8'; ");

Your database connection with PEAR::DB, Quercus, PostgreSQL, JDBC + JNDI should work now!

]]> http://dominikdorn.com/2009/12/quercus-postgresql-jndi-peardb/feed/ 0 Glassfish v3 final & available http://dominikdorn.com/2009/12/glassfish-v3-final-available/ http://dominikdorn.com/2009/12/glassfish-v3-final-available/#comments Thu, 10 Dec 2009 18:30:18 +0000 Dominik Dorn http://dominikdorn.com/?p=144 Paul Sterk just announced the availability of the final version of Glassfish v3!

I just tried it out and it really rocks! Download, extract, start domain, running!
Even PHP Applications are easily possible: I will look further into this this weekend!

]]> http://dominikdorn.com/2009/12/glassfish-v3-final-available/feed/ 0 Engaged in Social-PM http://dominikdorn.com/2009/12/engaged-in-social-pm/ http://dominikdorn.com/2009/12/engaged-in-social-pm/#comments Wed, 09 Dec 2009 23:42:00 +0000 Dominik Dorn http://dominikdorn.com/?p=141 Since today, I’m a commiter in Scrumshark – the Social Project Management Tool.

One of my student groups in Advanced Software Engineering already are using this tool and I will try to extend it with some nice and helpful features.

]]> http://dominikdorn.com/2009/12/engaged-in-social-pm/feed/ 0