My Java Notebook

JavaFX Kit Missing required modules

2008-10-04T09:28:00.014+01:00

Missing required modules for Plugin JavaFX Kit: requires javafx.sdkI've been trying to install NetBeans IDE 6.1 with JavaFX. According to Sun JavaFX Java Technology Web Page It provides all the tools you need to build a JavaFX application. There are two ways to install it:The recommended one is to download a build of NetBeans IDE 6.1 with JavaFX support included.If you already have NetBeans 6.1

VisualVM Java Profiler Causes Profiled JVM to Crash

2008-06-02T07:07:00.007+01:00

VisualVM is a tool that integrates several management and monitoring tools for local and remote Java applications including a Java profiler. The VisualVM profiler enable you to analyze CPU and memory usage of local Java applications.When attaching the VisualVM profiler to a Java application which is running on Java 6, the profiler may cause the Java application to crash. To prevent this from

Version Mismatch on BIRT Report Viewer

2008-05-29T09:21:00.005+01:00

My BIRT report viewer which is deployed on a Tomcat server used to work without any problem. Lately I have been getting the following error:Exceptionversion mismatchand "show exception stack trace" link.When I clicked on the link "show exception stack trace" I got an empty stack trace. This was strange because nothing was changed on the server which runs the database or the BIRT report viewer.

Hadoop File System Java Tutorial

2008-05-07T06:37:00.026+01:00

Hadoop Distributed File System (HDFS) Java tutorial.This Java tutorial contains examples and Java code on how to create, rename, delete and do much more on Hadoop Distributed File System using the Haddop Java API.Copy a file from the local file system to HDFSThe srcFile variable needs to contain the full name (path + file name) of the file in the local file system. The dstFile variable needs to

libstdc++2.10-glibc2.2 on Linux Ubuntu Hardy 8.04

2008-04-28T07:38:00.018+01:00

The libstdc++2.10-glibc2.2 package is not on the Ubuntu Hardy 8.04 Linux repositories so it can't be installed using apt-get or synaptic package manager.$ sudo apt-get install libstdc++2.10-glibc2.2 Reading package lists... Done Building dependency tree Reading state information... Done Package libstdc++2.10-glibc2.2 is not available, but is referred to by another package. This may mean that

Distributed Caching Essential Lessons

2008-04-14T11:05:00.008+01:00

InfoQ have a presentation about distributed caching which describes some of the challenges and points to consider when you plan to implement or integrate a distributed caching system. The presentation was given by Cameron Purdy from Tangosol (Oracle) and was recorded at JavaPolis 2005. Although it was a long time ago, I think it is still relevant and might be helpful to whoever needs a

Create log4j configuration file using wizardforge log4j wizard

2008-04-14T08:07:00.009+01:00

Log4j is a widely used Java based logging framework. If you worked with Java open source projects you definitely used log4j in your applications. Controlling of the output of the logs is done using the log4j configuration. If you decided to use log4j in your Java application or you are using a 3rd party Java library which uses log4j for logging and requires log4j, you will need to write a log4j

How to use JNDI with your J2SE application

2008-04-09T19:38:00.012+01:00

Have you ever wished you could have a JNDI (Java Naming and Directory Interface) server in your J2SE application? Do you need to unit test a Java class which gets its resources from JNDI? Well, you can. One of the nice things about JBoss is that it's Java open source project and that it's built from different components which can be used own their own. One of these components is the Java Naming

How to Create Connection to an Embedded Derby Database (Java DB)

2008-04-08T06:11:00.008+01:00

The Derby database also known as Java DB is an open source Java database. It is part of the Apache project and it is distribute with Sun Java JDK 6.In order to create a Connection or a DataSource Object to an embedded Derby database, we need to have the derby jar file in our Java classpath. Derby comes with JDK 6. If you don't have it you can download it from the derby web site or from sun site.

Eclipse DbUnit Plugin

2008-04-06T13:54:00.011+01:00

The eclipse DbUnit plugin in eclipse 3.3 is a shell project and is missing the DbUnit jars.Because of this, the DbUnit Test Case wizard fails with the following error:Creation of element failed.java.lang.reflect.InvocationTargetExceptionat org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:383)at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:313)at

JUnit 4 Features

2008-04-01T18:40:00.007+01:00

One of the main differences between JUnit 3 and JUnit 4 is the use of annotation instead of naming convention.Using @Test to define a test methodusing the @Test annotation we can define any method as a unit test no matter what the name of the method is. In JUnit 3 we needed to start a method name with the word 'test' . In JUnit 4 we can write the word 'test' in the beginning of the method name

Hidden Iterator in Collections toString()

2008-03-23T13:36:00.002Z

The toString() method in the Java Collection invokes the toString() method of each item using Iterator.In a multi-threaded environment a call to toString() should be synchronized to prevent ConcurrentModificationException.

Deploying BIRT to J2EE Server

2008-03-20T09:48:00.007Z

Eclipse BIRT report viewer can be deployed on a J2EE ServerIn order to use a JDBC driver in the BIRT viewer, the driver jar file needs to be in the viewer drivers directory. On BIRT 2.2.2 it is:/WEB-INF/platform/plugins/org.eclipse.birt.report.data.oda.jdbc_2.2.2.r22x_v20071206/driversOn BIRT 2.3 it is:/WEB-INF/platform/plugins/org.eclipse.birt.report.data.oda.jdbc_2.3.0.v20080610/driversIf you

TPTP Agent Controller on Ubuntu 7.10

2008-03-13T07:09:00.006Z

Prerequisites:The Eclipse tptp Agent Controller is compiled using libstdc++-libc6.2-2.so.3. If we don't have it under /usr/lib, then we need to install it:sudo apt-get install libstdc++2.10-glibc2.2Using Ubuntu Hardy 8.04? take a look here on how to install libstdc++2.10-glibc2.2Agent Controller Installation:$ sudo mkdir /opt/agntctrl.linux_ia32-TPTP-4.4.1$ sudo ln -s /opt/agntctrl.linux_ia32-

How to share objects between different classloaders on Terracotta

2008-03-11T07:32:00.012Z

Object identity in Terracotta is based on a combination of classloader name and object reference. When using Terracotta to share an object between different applications where the object class is loaded by classloaders with different names, exception is thrown. In my case I shared an object between deployed ear application on JBoss (app-ee.ear) and a console application.Exception in thread "

How to configure Firefox with Java

2008-03-10T07:28:00.003Z

In order to configure Firefox with installed JRE, a link needs to be created in the browser plugins directory to the JRE plugin directorycd ~/.mozilla/plugins/ln -s /usr/lib/jvm/java-6-sun/jre/plugin/i386/ns7/libjavaplugin_oji.so

JMX remote connection failure to Java application running on Ubuntu

2008-03-09T08:09:00.004Z

I have been trying to remote monitoring my application which was running on Ubuntu server using Jconsole and I kept on getting connection failure.When I run the same application on my Ubuntu desktop I did managed to connect to it using Jconsole.I wrote a small program to help me investigate the problem:public class JmxTest { public static void main(String[] args) { try { Thread.sleep(

How to Add Command Line Properties to JMeter

2008-03-05T08:48:00.003Z

Command line properties are very helpful when running JMeter in non-gui mode.Passing a property value to the test plan:-J[prop name]=[value]Accessing the property value from the test plan:${__P(prop name,default-value)}The first value is the property name. The second value is the default value if the test was started without passing a value to the property.For example, if we want to configure the

How to Disable Hadoop File System Permissions

2008-03-04T13:57:00.005Z

HDFS permissions is a new feature in Hadoop 0.16.0The default value for the HDFS permissions in hadoop 0.16.0 is true. In order to disable it you need to add the following block to your Hadoop configuration file (hadoop-site.xml):dfs.permissionsfalse

How to enable JMX on a Java Application

2008-03-04T13:29:00.006Z

To enable Java with JMX Agent we need to add the following line to the application VM arguments:-Dcom.sun.management.jmxremoteThis will enable only local monitoring. To enable remote JMX connection we need to specify the port which the JMX server will listen for remote connection.-Dcom.sun.management.jmxremote.port=9004 (or any other port number)The JMX remote connection is secured by default.