Tuesday, May 15, 2018

How to change font in Oracle SQL Developer

Tools > Preferences... > Code Editor > Fonts

edit the Font Name, Font Size
Click OK.


Sunday, March 4, 2018

java.lang.ClassCastException: $ProxyXX cannot be cast to xxx

When a system using EJB encountered a ClassCastException: $ProxyXX...
this could be due to same mappedName in the same system.

@Stateless(name = "MyBusinessObject", mappedName = "MyBusinessObject")

Therefore, when the system encountered the above exception,
the developer needs to check whether the class throwing the above exception mappedName also used in other class.


Thursday, October 26, 2017

How to transform Play project as Eclipse project

To transform a new Play project into Eclipse workspace.
the following steps can be followed.

1. navigate into the play project root directory. eg. C:\my-play-project

2. add the following plugin into the end of project/plugins.sbt

addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "5.2.2")

3. add the following configuration into the end of build.sbt

EclipseKeys.preTasks := Seq(compile in Compile, compile in Test)
EclipseKeys.projectFlavor := EclipseProjectFlavor.Java  
EclipseKeys.createSrc := EclipseCreateSrc.ValueSet(EclipseCreateSrc.ManagedClasses, EclipseCreateSrc.ManagedResources) 

Wednesday, October 25, 2017

How to create new Play Java project

1. make sure sbt is installed in your OS
2. create a new folder, eg. "my-play-project"
3. open command prompt, and navigate to the newly create folder
4. in the command prompt, type "sbt new playframework/play-java-seed.g8"
  a) enter project name
  b) enter organization
  c) enter scala version
  d) enter play version
  e) enter sbt version


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